Composites Part B: Engineering最新文献_第6页

Compositional gradient induced by heterogeneous domain synergy strategy toward high-performance diffusion bonding 异质结构域协同策略诱导成分梯度，实现高性能扩散键合

IF 12.7 1区材料科学 Q1 ENGINEERING, MULTIDISCIPLINARY

Composites Part B: Engineering

Pub Date : 2025-02-25 DOI: 10.1016/j.compositesb.2025.112330

Yinchen Wang , Zhijie Ding , Peng Li , Zhiwei Qin , Xiaoyang Bi , Liangliang Zhang , Chao Li , Honggang Dong , Huawei Sun , Yafang Cheng , Yutaka S. Sato

To pursue lightweight structures with the merit of high strength that could fulfil the critical demands of aerospace field, primarily governed by interfacial domain relationships, has become paramount. Herein, compositional gradient established by controllable Al content led to the generation of heterogeneous domains with coherent relationships to promote synergistic deformation and regulate anisotropy. High-performance diffusion bonding of Ti₂AlNb/GH4169 dissimilar metals was achieved with a shear strength of 349 MPa, which was attributed to the formation of primary Cr–Ti bond and the decrement of the Ni-Cr covalent bond content. The interfacial region was transformed from the soft domains of Cr_ss and (Cr, Ni, Fe)_ss phases to the heterogeneous domains of Ni₃(Al, Ti), Ni₁₀Zr₇, Cr_ss and (Cr, Ni, Fe)_ss phases. Mobile dislocations, originating from the soft domains, were imported into the hard domains through the coherent interface, which enabled the dynamic equilibrium of impeding dislocations without terminating them. First-principle calculations indicated that the bonding strength at the Al-doped Cr/(Cr, Fe, Ni) interface was elevated to 0.32 J/m² due to evident interfacial charge transfer promoting strong interatomic attraction. The bonding strength of the Ni₃(Al, Ti)/Cr interface reached 4.64 J/m², which was associated with the high adhesion Cr–Ti bond with metallic and covalent characteristics.

{"title":"Compositional gradient induced by heterogeneous domain synergy strategy toward high-performance diffusion bonding","authors":"Yinchen Wang , Zhijie Ding , Peng Li , Zhiwei Qin , Xiaoyang Bi , Liangliang Zhang , Chao Li , Honggang Dong , Huawei Sun , Yafang Cheng , Yutaka S. Sato","doi":"10.1016/j.compositesb.2025.112330","DOIUrl":"10.1016/j.compositesb.2025.112330","url":null,"abstract":"<div><div>To pursue lightweight structures with the merit of high strength that could fulfil the critical demands of aerospace field, primarily governed by interfacial domain relationships, has become paramount. Herein, compositional gradient established by controllable Al content led to the generation of heterogeneous domains with coherent relationships to promote synergistic deformation and regulate anisotropy. High-performance diffusion bonding of Ti<sub>2</sub>AlNb/GH4169 dissimilar metals was achieved with a shear strength of 349 MPa, which was attributed to the formation of primary Cr–Ti bond and the decrement of the Ni-Cr covalent bond content. The interfacial region was transformed from the soft domains of Cr<sub>ss</sub> and (Cr, Ni, Fe)<sub>ss</sub> phases to the heterogeneous domains of Ni<sub>3</sub>(Al, Ti), Ni<sub>10</sub>Zr<sub>7</sub>, Cr<sub>ss</sub> and (Cr, Ni, Fe)<sub>ss</sub> phases. Mobile dislocations, originating from the soft domains, were imported into the hard domains through the coherent interface, which enabled the dynamic equilibrium of impeding dislocations without terminating them. First-principle calculations indicated that the bonding strength at the Al-doped Cr/(Cr, Fe, Ni) interface was elevated to 0.32 J/m<sup>2</sup> due to evident interfacial charge transfer promoting strong interatomic attraction. The bonding strength of the Ni<sub>3</sub>(Al, Ti)/Cr interface reached 4.64 J/m<sup>2</sup>, which was associated with the high adhesion Cr–Ti bond with metallic and covalent characteristics.</div></div>","PeriodicalId":10660,"journal":{"name":"Composites Part B: Engineering","volume":"297 ","pages":"Article 112330"},"PeriodicalIF":12.7,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143526737","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Dissolution of cations in C-(N,K-)A-S-H gels at the nanoscale

IF 12.7 1区材料科学 Q1 ENGINEERING, MULTIDISCIPLINARY

Composites Part B: Engineering

Pub Date : 2025-02-25 DOI: 10.1016/j.compositesb.2025.112337

Chen Liu , Yong Tao , Shuai Nie , Yun Chen , Zhenming Li , Chi Sun Poon , Guang Ye

Alkali and alkali earth metal ions are normally present in the gels of alkali-activated materials as well as blended PC-based materials. Previous studies have revealed that the leaching of these cations can trigger the change in gel structure and even the gel decomposition. However, the dissolution of cations was rarely known and the underlying mechanisms remained unclear. To address this issue, five calcium-(sodium, potassium-)aluminum-silicate hydrates (C-(N,K-)A-S-H gels) with different Ca/Si ratios (0.8–1.2) and Al/Si ratios (0.1–0.3) were synthesized to investigate the leaching behaviour of Ca, Na and K. For the first time, the dissolution free energies of Ca, Na and K in C-(N,K-)A-S-H gels were calculated using molecular dynamics simulations with the metadynamics method. Experimental results showed that Na showed the highest leaching ratio, followed by K and Ca, attributed to the lowest dissolution free energy of Na. The gel with a higher Ca/Si ratio or a lower Al/Si ratio showed higher charge positivity on the surface, resulting in reduced leaching of the three cations. Additionally, the presence of K was found to promote the dissolution of Na in gels.

{"title":"Dissolution of cations in C-(N,K-)A-S-H gels at the nanoscale","authors":"Chen Liu , Yong Tao , Shuai Nie , Yun Chen , Zhenming Li , Chi Sun Poon , Guang Ye","doi":"10.1016/j.compositesb.2025.112337","DOIUrl":"10.1016/j.compositesb.2025.112337","url":null,"abstract":"<div><div>Alkali and alkali earth metal ions are normally present in the gels of alkali-activated materials as well as blended PC-based materials. Previous studies have revealed that the leaching of these cations can trigger the change in gel structure and even the gel decomposition. However, the dissolution of cations was rarely known and the underlying mechanisms remained unclear. To address this issue, five calcium-(sodium, potassium-)aluminum-silicate hydrates (C-(N,K-)A-S-H gels) with different Ca/Si ratios (0.8–1.2) and Al/Si ratios (0.1–0.3) were synthesized to investigate the leaching behaviour of Ca, Na and K. For the first time, the dissolution free energies of Ca, Na and K in C-(N,K-)A-S-H gels were calculated using molecular dynamics simulations with the metadynamics method. Experimental results showed that Na showed the highest leaching ratio, followed by K and Ca, attributed to the lowest dissolution free energy of Na. The gel with a higher Ca/Si ratio or a lower Al/Si ratio showed higher charge positivity on the surface, resulting in reduced leaching of the three cations. Additionally, the presence of K was found to promote the dissolution of Na in gels.</div></div>","PeriodicalId":10660,"journal":{"name":"Composites Part B: Engineering","volume":"297 ","pages":"Article 112337"},"PeriodicalIF":12.7,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143519456","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Inhibition and facilitation mechanisms of galvanic corrosion between carbon fiber and steel in atmospheric environments

IF 12.7 1区材料科学 Q1 ENGINEERING, MULTIDISCIPLINARY

Composites Part B: Engineering

Pub Date : 2025-02-25 DOI: 10.1016/j.compositesb.2025.112332

Muye Yang, Jian Tang, Shigenobu Kainuma

For a steel structure with carbon fiber-reinforced polymer (CFRP) bonded reinforcement, galvanic corrosion is thermodynamically favored between the carbon fiber and metal. However, understanding of corrosion behaviors and mechanisms between two materials in atmospheric environments remain limited. This study investigated the galvanic corrosion behavior between carbon fiber and steel based on activation-controlled kinetics. The inhibition and facilitation factors of galvanic corrosion in an atmospheric environment were examined, including the material properties of the carbon fiber and the dynamic influence of system resistance, water-film condition, and temperature variation. The results revealed that localized pitting corrosion is prone to occurring near the electrical contact points of the two materials. Under extreme atmospheric conditions, the galvanic corrosion rate increases by 1–2 orders of magnitude as the reaction shifts from diffusion control to activation control. Additionally, elevated temperatures exacerbate this effect, with the galvanic corrosion rate exhibiting greater sensitivity to temperature changes than steel self-corrosion. Finally, a simplified macroscopic circuit model was proposed to integrate the inhibition and facilitation mechanisms, based on the four coupling modes governed by the Butler–Volmer equation. The present results provide new insights regarding the corrosion and deterioration mechanism of CFRP bonded components.

{"title":"Inhibition and facilitation mechanisms of galvanic corrosion between carbon fiber and steel in atmospheric environments","authors":"Muye Yang, Jian Tang, Shigenobu Kainuma","doi":"10.1016/j.compositesb.2025.112332","DOIUrl":"10.1016/j.compositesb.2025.112332","url":null,"abstract":"<div><div>For a steel structure with carbon fiber-reinforced polymer (CFRP) bonded reinforcement, galvanic corrosion is thermodynamically favored between the carbon fiber and metal. However, understanding of corrosion behaviors and mechanisms between two materials in atmospheric environments remain limited. This study investigated the galvanic corrosion behavior between carbon fiber and steel based on activation-controlled kinetics. The inhibition and facilitation factors of galvanic corrosion in an atmospheric environment were examined, including the material properties of the carbon fiber and the dynamic influence of system resistance, water-film condition, and temperature variation. The results revealed that localized pitting corrosion is prone to occurring near the electrical contact points of the two materials. Under extreme atmospheric conditions, the galvanic corrosion rate increases by 1–2 orders of magnitude as the reaction shifts from diffusion control to activation control. Additionally, elevated temperatures exacerbate this effect, with the galvanic corrosion rate exhibiting greater sensitivity to temperature changes than steel self-corrosion. Finally, a simplified macroscopic circuit model was proposed to integrate the inhibition and facilitation mechanisms, based on the four coupling modes governed by the Butler–Volmer equation. The present results provide new insights regarding the corrosion and deterioration mechanism of CFRP bonded components.</div></div>","PeriodicalId":10660,"journal":{"name":"Composites Part B: Engineering","volume":"297 ","pages":"Article 112332"},"PeriodicalIF":12.7,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143534323","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Recycling contaminated wastepaper using composite-based additive manufacturing

IF 12.7 1区材料科学 Q1 ENGINEERING, MULTIDISCIPLINARY

Composites Part B: Engineering

Pub Date : 2025-02-24 DOI: 10.1016/j.compositesb.2025.112346

Arnold Bangel III , Diego Robles , Jake Atzen , Xuan Song

Composite Based Additive Manufacturing (CBAM) is an additive manufacturing process for fabricating lightweight, high-strength fiber-reinforced polymer (FRP) composites. The CBAM process uses polymer powder and sheets of non-woven fiber as feedstocks. These sheets and polymer particles are selectively stacked layer by layer and pressed to make a complex part. In this paper, we present the use of the CBAM process in recycling wastepaper, particularly those with contaminants, into value-added FRP composites. Thin sheets of paper fibers are recycled from wastepaper pulps. The properties of the recycled sheets of paper fibers (e.g., thickness, porosity, strength) are studied through controlling the concentrations of pulp/water and strengthening agents (e.g., linen fibers). The effects of waterproofing spray of the fiber sheets are investigated to enhance the powder capture. The proposed method offers a cost-effective route to recycle wastepaper with contaminants into value-added composite products, which would otherwise go to the landfill. Making products from recycled wastepaper has a positive effect on the environment and can help reduce the cost of the CBAM technology, for which the feedstock materials account for over 60 % of the total cost.

{"title":"Recycling contaminated wastepaper using composite-based additive manufacturing","authors":"Arnold Bangel III , Diego Robles , Jake Atzen , Xuan Song","doi":"10.1016/j.compositesb.2025.112346","DOIUrl":"10.1016/j.compositesb.2025.112346","url":null,"abstract":"<div><div>Composite Based Additive Manufacturing (CBAM) is an additive manufacturing process for fabricating lightweight, high-strength fiber-reinforced polymer (FRP) composites. The CBAM process uses polymer powder and sheets of non-woven fiber as feedstocks. These sheets and polymer particles are selectively stacked layer by layer and pressed to make a complex part. In this paper, we present the use of the CBAM process in recycling wastepaper, particularly those with contaminants, into value-added FRP composites. Thin sheets of paper fibers are recycled from wastepaper pulps. The properties of the recycled sheets of paper fibers (e.g., thickness, porosity, strength) are studied through controlling the concentrations of pulp/water and strengthening agents (e.g., linen fibers). The effects of waterproofing spray of the fiber sheets are investigated to enhance the powder capture. The proposed method offers a cost-effective route to recycle wastepaper with contaminants into value-added composite products, which would otherwise go to the landfill. Making products from recycled wastepaper has a positive effect on the environment and can help reduce the cost of the CBAM technology, for which the feedstock materials account for over 60 % of the total cost.</div></div>","PeriodicalId":10660,"journal":{"name":"Composites Part B: Engineering","volume":"297 ","pages":"Article 112346"},"PeriodicalIF":12.7,"publicationDate":"2025-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143511512","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Self-reinforced thermoplastic polyurethane composite with excellent mechanical properties, heat resistance and sustainable recycling

IF 12.7 1区材料科学 Q1 ENGINEERING, MULTIDISCIPLINARY

Composites Part B: Engineering

Pub Date : 2025-02-24 DOI: 10.1016/j.compositesb.2025.112342

Xiulu Gao, Huan Qian, Jiaqi Wang, Yuxuan Hong, Yichong Chen, Ling Zhao, Dongdong Hu

The traditional reinforcement and toughening approaches of thermoplastic polyurethane (TPU) fail to adequately address the mechanical properties, compatibility and recyclability of TPU composites. In this study, the self-reinforced TPU composite was successfully prepared by introducing self-reinforced fiber structure. The reinforced fibers and matrix phase had the same chemical composition, and the reinforced fibers could be uniformly distributed in the TPU matrix. The fibril network structure formed by reinforced fibers enhanced the rheological properties of self-reinforced TPU composites. The hydrogen bond interactions between reinforced fibers and TPU matrix improved the micro-phase separation structure. The fibril network and excellent interfacial interactions significantly enhanced the strength and toughness of TPU matrix. When the reinforced fiber content was 7 wt%, the tensile strength, elongation at break and tensile toughness of TPU7 were increased by 58.2 %, 107.1 % and 210.3 %, respectively. The introduction of reinforced fibers increased the heat resistance of TPU composites by 20–30 °C. After ten-times closed-loop recycling process, the elongation at break of TPU7 only decreased by 11.0 %. This work provides a solution strategy for preparing TPU composites with ultra-high mechanical properties, thermal stability and sustainable recycling-reprocessing.

{"title":"Self-reinforced thermoplastic polyurethane composite with excellent mechanical properties, heat resistance and sustainable recycling","authors":"Xiulu Gao, Huan Qian, Jiaqi Wang, Yuxuan Hong, Yichong Chen, Ling Zhao, Dongdong Hu","doi":"10.1016/j.compositesb.2025.112342","DOIUrl":"10.1016/j.compositesb.2025.112342","url":null,"abstract":"<div><div>The traditional reinforcement and toughening approaches of thermoplastic polyurethane (TPU) fail to adequately address the mechanical properties, compatibility and recyclability of TPU composites. In this study, the self-reinforced TPU composite was successfully prepared by introducing self-reinforced fiber structure. The reinforced fibers and matrix phase had the same chemical composition, and the reinforced fibers could be uniformly distributed in the TPU matrix. The fibril network structure formed by reinforced fibers enhanced the rheological properties of self-reinforced TPU composites. The hydrogen bond interactions between reinforced fibers and TPU matrix improved the micro-phase separation structure. The fibril network and excellent interfacial interactions significantly enhanced the strength and toughness of TPU matrix. When the reinforced fiber content was 7 wt%, the tensile strength, elongation at break and tensile toughness of TPU7 were increased by 58.2 %, 107.1 % and 210.3 %, respectively. The introduction of reinforced fibers increased the heat resistance of TPU composites by 20–30 °C. After ten-times closed-loop recycling process, the elongation at break of TPU7 only decreased by 11.0 %. This work provides a solution strategy for preparing TPU composites with ultra-high mechanical properties, thermal stability and sustainable recycling-reprocessing.</div></div>","PeriodicalId":10660,"journal":{"name":"Composites Part B: Engineering","volume":"297 ","pages":"Article 112342"},"PeriodicalIF":12.7,"publicationDate":"2025-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143511513","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A porous electrically and thermally conductive composite film for heat dissipation and electromagnetic interference shielding

IF 12.7 1区材料科学 Q1 ENGINEERING, MULTIDISCIPLINARY

Composites Part B: Engineering

Pub Date : 2025-02-24 DOI: 10.1016/j.compositesb.2025.112339

Lei Zhang , Xiaoxiao Ding , Debin Lin , Yongbao Feng , Huili Fu , Guang Xiao , Peng Xu , Qiulong Li

MXene, as an emerging graphene-like 2D material, has exhibited excellent electromagnetic interference (EMI) shielding performance because of its outstanding electrical conductivity, multiple interfaces, low density, and easy structure-constructing feature. However, the easy to stack for the 2D structure will seriously weaken the attenuation of electromagnetic waves, and heighten the secondary reflection because of high conductivity. Herein, we prepared the 3D porous MXene@fractal Ag micro-dendrites (Ag FDs) composite films by using vacuum filtration method that is induced by K ions, and then used the freeze-drying way to construct the 3D porous structure. The introduction of Ag FDs into the system can significantly improve the electrical conductivity and thermal conductivity. Additionally, the design of porous structure dramatically enhanced the multiple dissipation of electromagnetic waves, thereby augmenting the EMI shielding performance. The obtained porous composite film (thickness: 55 μm) with only 20 wt% Ag FDs delivers an outstanding EMI shielding effectiveness (SE) of 69 dB with an excellent specific EMI SE (1.25 × 10⁴ dB cm² g⁻¹), and a distinguished thermal conductivity of 26.6 W m⁻¹ K⁻¹. This porous MXene@Ag FDs composite film demonstrates exceptional EMI shielding and thermal transport properties, offering new strategies for integrating EMI shielding with thermal management.

{"title":"A porous electrically and thermally conductive composite film for heat dissipation and electromagnetic interference shielding","authors":"Lei Zhang , Xiaoxiao Ding , Debin Lin , Yongbao Feng , Huili Fu , Guang Xiao , Peng Xu , Qiulong Li","doi":"10.1016/j.compositesb.2025.112339","DOIUrl":"10.1016/j.compositesb.2025.112339","url":null,"abstract":"<div><div>MXene, as an emerging graphene-like 2D material, has exhibited excellent electromagnetic interference (EMI) shielding performance because of its outstanding electrical conductivity, multiple interfaces, low density, and easy structure-constructing feature. However, the easy to stack for the 2D structure will seriously weaken the attenuation of electromagnetic waves, and heighten the secondary reflection because of high conductivity. Herein, we prepared the 3D porous MXene@fractal Ag micro-dendrites (Ag FDs) composite films by using vacuum filtration method that is induced by K ions, and then used the freeze-drying way to construct the 3D porous structure. The introduction of Ag FDs into the system can significantly improve the electrical conductivity and thermal conductivity. Additionally, the design of porous structure dramatically enhanced the multiple dissipation of electromagnetic waves, thereby augmenting the EMI shielding performance. The obtained porous composite film (thickness: 55 μm) with only 20 wt% Ag FDs delivers an outstanding EMI shielding effectiveness (SE) of 69 dB with an excellent specific EMI SE (1.25 × 10<sup>4</sup> dB cm<sup>2</sup> g<sup>−1</sup>), and a distinguished thermal conductivity of 26.6 W m<sup>−1</sup> K<sup>−1</sup>. This porous MXene@Ag FDs composite film demonstrates exceptional EMI shielding and thermal transport properties, offering new strategies for integrating EMI shielding with thermal management.</div></div>","PeriodicalId":10660,"journal":{"name":"Composites Part B: Engineering","volume":"297 ","pages":"Article 112339"},"PeriodicalIF":12.7,"publicationDate":"2025-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143511514","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Cobalt/copper coordinated organic-inorganic hybrid fibrous phosphorus-nitrogen flame retardant: Simultaneously improving fire safety, deicing and mechanical properties for thermoplastic polyurethane 钴/铜配位有机-无机混合纤维磷氮阻燃剂：同时改善热塑性聚氨酯的防火安全、除冰和机械性能

IF 12.7 1区材料科学 Q1 ENGINEERING, MULTIDISCIPLINARY

Composites Part B: Engineering

Pub Date : 2025-02-24 DOI: 10.1016/j.compositesb.2025.112292

Gaoyuan Li, Jirui Qu, Biyu Huang, Hongbo Zhao, Wenbo Sun, Haopeng Zhang, Lei Liu, Xilei Chen, Chuanmei Jiao

Thermoplastic polyurethane (TPU), a commonly used cable wrapping material for new energy vehicles and charging stations but faces the limitation of high fire hazard. However, conventional synthesis strategies of flame retardants (FRs) often fail to achieve the enhancement of the combination of fundamental properties of TPU, including flame retardancy, melt dropping resistance, stretchability, and toughness, which are necessary for practical applications. Herein, a novel strategy for the synthesis of a cobalt/copper coordinated organic-inorganic hybrid fibrous phosphorus-nitrogen FR (CoCu/P–N) inspired by supramolecular aggregates is proposed and used as an additive for TPU. TPU composites containing CoCu/P–N (TPU-CoCu/P–N) exhibited remarkable improvements in fire safety, melt dripping resistance, mechanical properties, and deicing performance. Cone calorimeter tests (CCT) revealed that TPU-6CoCu/P–N achieved substantial reductions in peak heat release rate (pHRR), total smoke production (TSP), and total carbon monoxide production (TCOP) values by 65.2 %, 74.2 %, and 59.3 %, respectively, compared to pure TPU. Notably, only 2 wt% CoCu/P–N enabled TPU composite to achieve UL-94 V-0 rating. Additionally, ice on the surface of TPU-6CoCu/P–N melted and slid off significantly faster. Furthermore, TPU-6CoCu/P–N demonstrated a high tensile strength of 36.48 MPa and an elongation at break of 878.94 %. Through comprehensive characterization and analysis, the underlying mechanisms responsible for the enhanced multifunctional performance of TPU-CoCu/P–N were elucidated. This work provides valuable insights and strategies for the design of advanced FRs, contributing to the development of safer high-performance TPU composites.

{"title":"Cobalt/copper coordinated organic-inorganic hybrid fibrous phosphorus-nitrogen flame retardant: Simultaneously improving fire safety, deicing and mechanical properties for thermoplastic polyurethane","authors":"Gaoyuan Li, Jirui Qu, Biyu Huang, Hongbo Zhao, Wenbo Sun, Haopeng Zhang, Lei Liu, Xilei Chen, Chuanmei Jiao","doi":"10.1016/j.compositesb.2025.112292","DOIUrl":"10.1016/j.compositesb.2025.112292","url":null,"abstract":"<div><div>Thermoplastic polyurethane (TPU), a commonly used cable wrapping material for new energy vehicles and charging stations but faces the limitation of high fire hazard. However, conventional synthesis strategies of flame retardants (FRs) often fail to achieve the enhancement of the combination of fundamental properties of TPU, including flame retardancy, melt dropping resistance, stretchability, and toughness, which are necessary for practical applications. Herein, a novel strategy for the synthesis of a cobalt/copper coordinated organic-inorganic hybrid fibrous phosphorus-nitrogen FR (CoCu/P–N) inspired by supramolecular aggregates is proposed and used as an additive for TPU. TPU composites containing CoCu/P–N (TPU-CoCu/P–N) exhibited remarkable improvements in fire safety, melt dripping resistance, mechanical properties, and deicing performance. Cone calorimeter tests (CCT) revealed that TPU-6CoCu/P–N achieved substantial reductions in peak heat release rate (pHRR), total smoke production (TSP), and total carbon monoxide production (TCOP) values by 65.2 %, 74.2 %, and 59.3 %, respectively, compared to pure TPU. Notably, only 2 wt% CoCu/P–N enabled TPU composite to achieve UL-94 V-0 rating. Additionally, ice on the surface of TPU-6CoCu/P–N melted and slid off significantly faster. Furthermore, TPU-6CoCu/P–N demonstrated a high tensile strength of 36.48 MPa and an elongation at break of 878.94 %. Through comprehensive characterization and analysis, the underlying mechanisms responsible for the enhanced multifunctional performance of TPU-CoCu/P–N were elucidated. This work provides valuable insights and strategies for the design of advanced FRs, contributing to the development of safer high-performance TPU composites.</div></div>","PeriodicalId":10660,"journal":{"name":"Composites Part B: Engineering","volume":"297 ","pages":"Article 112292"},"PeriodicalIF":12.7,"publicationDate":"2025-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143519455","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Neuron-inspired structure towards ultra-high thermal conductivity of Mg-based materials

IF 12.7 1区材料科学 Q1 ENGINEERING, MULTIDISCIPLINARY

Composites Part B: Engineering

Pub Date : 2025-02-24 DOI: 10.1016/j.compositesb.2025.112345

Fanjin Yao , Bo Hu , Zixin Li , Lexian Li , Jiaxuan Han , Zhenfei Jiang , Dejiang Li , Xiaoqin Zeng

The remarkable lightweight characteristics of magnesium (Mg) offer significant advantages in 5G communication, 3C products, and new energy vehicles. Yet, the unsatisfactory thermal conductivity of Mg alloys presents formidable challenges in accommodating the advancement of high power density, highly integrated, and miniaturized electronic components in the era of intelligence. Here, inspired by the neurons in the human brain, cell body-like graphite flakes (GF) and axon-like carbon fibers (CF) are constructed into a neuron-inspired structure through pre-mixed & laid powder stir casting (PPSC). Drawing inspiration from the myelin sheath of neurons, a biomimetic interfacial structure is constructed in situ to ensure efficient heat conduction. The neuron-inspired Mg-based materials at a GF:CF volume ratio of 1:3 display an ultrahigh and isotropic thermal conductivity of 200.5 W/(m·K) (393 % of the common cast Mg alloys, AZ91D) and an exceptional low density of 1.80 g/cm³. This epitomizes the zenith of comprehensive properties among all thermal management materials reported to date. The ingeniously devised neuron-inspired structure, myelin sheath biomimetic interface, and tunable GF-CF volume ratio co-contribute to the superior thermal conductivity. This work oﬀers an advanced biomimetic strategy towards the development of next-generation lightweight thermal management materials.

{"title":"Neuron-inspired structure towards ultra-high thermal conductivity of Mg-based materials","authors":"Fanjin Yao , Bo Hu , Zixin Li , Lexian Li , Jiaxuan Han , Zhenfei Jiang , Dejiang Li , Xiaoqin Zeng","doi":"10.1016/j.compositesb.2025.112345","DOIUrl":"10.1016/j.compositesb.2025.112345","url":null,"abstract":"<div><div>The remarkable lightweight characteristics of magnesium (Mg) offer significant advantages in 5G communication, 3C products, and new energy vehicles. Yet, the unsatisfactory thermal conductivity of Mg alloys presents formidable challenges in accommodating the advancement of high power density, highly integrated, and miniaturized electronic components in the era of intelligence. Here, inspired by the neurons in the human brain, cell body-like graphite flakes (GF) and axon-like carbon fibers (CF) are constructed into a neuron-inspired structure through pre-mixed & laid powder stir casting (PPSC). Drawing inspiration from the myelin sheath of neurons, a biomimetic interfacial structure is constructed in situ to ensure efficient heat conduction. The neuron-inspired Mg-based materials at a GF:CF volume ratio of 1:3 display an ultrahigh and isotropic thermal conductivity of 200.5 W/(m·K) (393 % of the common cast Mg alloys, AZ91D) and an exceptional low density of 1.80 g/cm<sup>3</sup>. This epitomizes the zenith of comprehensive properties among all thermal management materials reported to date. The ingeniously devised neuron-inspired structure, myelin sheath biomimetic interface, and tunable GF-CF volume ratio co-contribute to the superior thermal conductivity. This work oﬀers an advanced biomimetic strategy towards the development of next-generation lightweight thermal management materials.</div></div>","PeriodicalId":10660,"journal":{"name":"Composites Part B: Engineering","volume":"297 ","pages":"Article 112345"},"PeriodicalIF":12.7,"publicationDate":"2025-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143511516","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Desulfurization-modified red mud for supersulfated cement production: Insights into hydration kinetics, microstructure, and mechanical properties

IF 12.7 1区材料科学 Q1 ENGINEERING, MULTIDISCIPLINARY

Composites Part B: Engineering

Pub Date : 2025-02-24 DOI: 10.1016/j.compositesb.2025.112340

Zhongtao Luo , Mengxiao Ge , Lei Liu , Xiaohai Liu , Wensheng Zhang , Jiayuan Ye , Mingkang Gao , Yifan Yang , Maoliang Zhang , Xinhong Liu

Investigating the production of supersulfated cement (SSC) using desulfurization-modified red mud is essential for enhancing the high-value utilization of calcium-based solid waste and advancing the development of low-carbon cementitious materials. In this study, red mud (RM) underwent desulfurization modification via a simulated flue gas desulfurization process, yielding red mud desulfurization residue (RMD). This RMD was subsequently employed as a resource component for the production of SSC samples. The effect of RMD addition on compressive strength was examined. The hydration kinetics and microstructural characteristics of the SSC based on RMD (SSCR) system were analyzed using various techniques, including ICC, XRD, TGA, FT-IR, MAS NMR, MIP and SEM-EDS. The results indicated that gypsum generated from the desulfurization reaction constituted the primary component of the resulting RMD. The gypsum particles exhibited a regular columnar morphology, while the unreacted residual particles displayed a coarser and more porous microstructure. Compared to a single alkali-activated system utilizing Ca(OH)₂, the appropriate incorporation of RMD significantly accelerated the hydration process of the SSCR system. The increase in products such as AFt and C-(A)-S-H gels, along with an increased proportion of gel pores (<10 nm), collectively contributed to the enhancement of mechanical properties. However, the presence of larger residual particles within the RMD might lead to the formation of larger voids and microcracks in the hardened paste, potentially limiting strength development, particularly when RMD was incorporated in excessive amounts.

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引用次数: 0

Amorphous calcium carbonate formation from carbonated recycled cement powder: A novel carbonation-activated cementitious material

IF 12.7 1区材料科学 Q1 ENGINEERING, MULTIDISCIPLINARY

Composites Part B: Engineering

Pub Date : 2025-02-24 DOI: 10.1016/j.compositesb.2025.112336

Jiayu Huang , Yuxuan Chen , Qingliang Yu

Research on recycled cement powder (RCP) has shown great potential for carbon sequestration, however understanding of calcium carbonate polymorphs evolution in carbonated recycled cement powder (C-RCP) remains limited, especially concerning the formation of amorphous calcium carbonate (ACC) and its impact on the development of concrete strength. In this study, ACC is produced from C-RCP using poly-aspartic acid (pAsp) to control the crystallization of CaCO₃, aiming to create a highly reactive cementitious material. The research systematically investigates the effects of various processing parameters, specifically pAsp concentration, ethanol concentration, temperature, and carbonation duration on ACC formation, microstructure of carbonation products , and the chemical environment. Additionally, the compressive strength of C-RCP as supplementary cementitious materials (SCMs) is also evaluated. The results indicate that higher concentrations of pAsp (10–15 %) and ethanol (50–70 %) enhance the stabilization of ACC formation. The decrease in carbonation degree correlates with the increase in the formation of metastable calcium carbonate (mCC), including ACC and vaterite within C-RCP. Furthermore, elevated temperature and extended carbonation duration promote the formation of vaterite due to an increased carbonation degree. The incorporation of novel C-RCP, characterized by a maximum relative content of mCC, significantly enhances the strength of cement paste, attributed to the transformation and crystallization of ACC. This method utilizes pAsp to control the crystallization of calcium carbonate in C-RCP, effectively activating the reactivity of the calcium carbonate phase. This approach significantly enhances the potential of C-RCP as a novel cement-based material by optimizing its hydration reactivity, making it particularly well-suited for application in carbonated cement composites.

{"title":"Amorphous calcium carbonate formation from carbonated recycled cement powder: A novel carbonation-activated cementitious material","authors":"Jiayu Huang , Yuxuan Chen , Qingliang Yu","doi":"10.1016/j.compositesb.2025.112336","DOIUrl":"10.1016/j.compositesb.2025.112336","url":null,"abstract":"<div><div>Research on recycled cement powder (RCP) has shown great potential for carbon sequestration, however understanding of calcium carbonate polymorphs evolution in carbonated recycled cement powder (C-RCP) remains limited, especially concerning the formation of amorphous calcium carbonate (ACC) and its impact on the development of concrete strength. In this study, ACC is produced from C-RCP using poly-aspartic acid (pAsp) to control the crystallization of CaCO<sub>3</sub>, aiming to create a highly reactive cementitious material. The research systematically investigates the effects of various processing parameters, specifically pAsp concentration, ethanol concentration, temperature, and carbonation duration on ACC formation, microstructure of carbonation products , and the chemical environment. Additionally, the compressive strength of C-RCP as supplementary cementitious materials (SCMs) is also evaluated. The results indicate that higher concentrations of pAsp (10–15 %) and ethanol (50–70 %) enhance the stabilization of ACC formation. The decrease in carbonation degree correlates with the increase in the formation of metastable calcium carbonate (mCC), including ACC and vaterite within C-RCP. Furthermore, elevated temperature and extended carbonation duration promote the formation of vaterite due to an increased carbonation degree. The incorporation of novel C-RCP, characterized by a maximum relative content of mCC, significantly enhances the strength of cement paste, attributed to the transformation and crystallization of ACC. This method utilizes pAsp to control the crystallization of calcium carbonate in C-RCP, effectively activating the reactivity of the calcium carbonate phase. This approach significantly enhances the potential of C-RCP as a novel cement-based material by optimizing its hydration reactivity, making it particularly well-suited for application in carbonated cement composites.</div></div>","PeriodicalId":10660,"journal":{"name":"Composites Part B: Engineering","volume":"297 ","pages":"Article 112336"},"PeriodicalIF":12.7,"publicationDate":"2025-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143511515","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0