Pub Date : 2025-01-15DOI: 10.1016/j.jeurceramsoc.2025.117217
Qianhui Qin , Yangjie Han , Yuke Zeng , Meixia Cai , Song Li , Zhichao Xiao , Hongyan Xia , Jiping Wang
This study presents a cost-effective and time-efficient method for preparing C/C-SiC composites using low-temperature RMI with Si-33Ni and Si-14Ti alloys, addressing the high reactivity of pure Si. Carbon fiber plain cloth was surface treated, impregnated with phenolic resin, laminated with hot pressing, and carbonized to form C/C composites, which were then infiltrated with Si-Ni and Si-Ti alloys at 1390°C to 1550°C. The results show that the C/C-SiC composites prepared at 1390°C using Si-Ni alloy and at 1550°C using Si-Ti alloy exhibit superior mechanical properties, with flexural strengths of 230 MPa and 221 MPa, and fracture toughnesses of 5.12 MPa·m1/2 and 4.89 MPa·m1/2, respectively—surpassing those prepared with pure Si. Because of the brittle Si were replaced by related alloy phase and few damages to fibers during RMI. These findings provide insights into the low-temperature RMI process and pave the way for developing next-generation lightweight, high-strength composite materials.
{"title":"Microstructure and mechanical properties of 2D laminated C/C-SiC composites prepared by low-temperature reactive melt infiltration with silicon alloy","authors":"Qianhui Qin , Yangjie Han , Yuke Zeng , Meixia Cai , Song Li , Zhichao Xiao , Hongyan Xia , Jiping Wang","doi":"10.1016/j.jeurceramsoc.2025.117217","DOIUrl":"10.1016/j.jeurceramsoc.2025.117217","url":null,"abstract":"<div><div>This study presents a cost-effective and time-efficient method for preparing C/C-SiC composites using low-temperature RMI with Si-33Ni and Si-14Ti alloys, addressing the high reactivity of pure Si. Carbon fiber plain cloth was surface treated, impregnated with phenolic resin, laminated with hot pressing, and carbonized to form C/C composites, which were then infiltrated with Si-Ni and Si-Ti alloys at 1390°C to 1550°C. The results show that the C/C-SiC composites prepared at 1390°C using Si-Ni alloy and at 1550°C using Si-Ti alloy exhibit superior mechanical properties, with flexural strengths of 230 MPa and 221 MPa, and fracture toughnesses of 5.12 MPa·m<sup>1/2</sup> and 4.89 MPa·m<sup>1/2</sup>, respectively—surpassing those prepared with pure Si. Because of the brittle Si were replaced by related alloy phase and few damages to fibers during RMI. These findings provide insights into the low-temperature RMI process and pave the way for developing next-generation lightweight, high-strength composite materials.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 6","pages":"Article 117217"},"PeriodicalIF":5.8,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143156191","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-14DOI: 10.1016/j.jeurceramsoc.2025.117218
Bingqing Yang , Wei Xu , Yu Zhang , Zedong Xu , Shizhe Wu , Xiao Wu , Chunlin Zhao , Tengfei Lin , Min Gao , Cong Lin
Lead-free AgNbO3-based antiferroelectric (AFE) ceramics have attracted increasing interest owing to their environmentally friendly nature and excellent potential in energy storage devices. However, the poor breakdown strength (BDS) of AgNbO3 limits its practical application. Herein, the Mn/Sm-codoing strategy and the tape-casting technique were utilized to improve the BDS of AgNbO3-based ceramics to 320 kV cm−1, which is almost 1.8 and 1.6 times greater than that of doped AgNbO3 prepared by solid-state reaction and that of pure AgNbO3 prepared by the tape-casting method, respectively. The relatively high BDS is attributed to the improved density, the grain size reduction and the decrease of concentration of oxygen vacancies. As a result, a high energy storage density of 5.18 J cm−3 with an efficiency of 73.3 % were observed. Our research enriches the fabrication strategy of lead-free AFE ceramics with high BDS and contributes to the applications of AFE-based energy storage devices.
{"title":"Enhanced breakdown strength via a codoping strategy and tape-casting technique: An approach for excellent energy storage performance in lead-free AgNbO3-based antiferroelectrics","authors":"Bingqing Yang , Wei Xu , Yu Zhang , Zedong Xu , Shizhe Wu , Xiao Wu , Chunlin Zhao , Tengfei Lin , Min Gao , Cong Lin","doi":"10.1016/j.jeurceramsoc.2025.117218","DOIUrl":"10.1016/j.jeurceramsoc.2025.117218","url":null,"abstract":"<div><div>Lead-free AgNbO<sub>3</sub>-based antiferroelectric (AFE) ceramics have attracted increasing interest owing to their environmentally friendly nature and excellent potential in energy storage devices. However, the poor breakdown strength (BDS) of AgNbO<sub>3</sub> limits its practical application. Herein, the Mn/Sm-codoing strategy and the tape-casting technique were utilized to improve the BDS of AgNbO<sub>3</sub>-based ceramics to 320 kV cm<sup>−1</sup>, which is almost 1.8 and 1.6 times greater than that of doped AgNbO<sub>3</sub> prepared by solid-state reaction and that of pure AgNbO<sub>3</sub> prepared by the tape-casting method, respectively. The relatively high BDS is attributed to the improved density, the grain size reduction and the decrease of concentration of oxygen vacancies. As a result, a high energy storage density of 5.18 J cm<sup>−3</sup> with an efficiency of 73.3 % were observed. Our research enriches the fabrication strategy of lead-free AFE ceramics with high BDS and contributes to the applications of AFE-based energy storage devices.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 7","pages":"Article 117218"},"PeriodicalIF":5.8,"publicationDate":"2025-01-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143172955","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The interface between the aggregates and matrix in corundum-spinel castables plays a crucial role in the thermal shock resistance. The lanthanum hexa-aluminate (LHA) interfacial layer between aggregates and matrix were prepared by dip-coating and heat-treatment. The microstructural evolution of the LHA interfacial layer and its effect on the thermal shock resistance of castables were investigated. The results indicated that the highest amount of platelet-like LHA crystals was formed after heat-treatment at 1600 ℃. The thermal shock resistance of the castables was significantly enhanced by the LHA interfacial layer, with the optimal residual strength ratio at 1600 ℃. The residual strength ratio after 3 thermal shock cycles were improved by 166 %. The specific fracture energy of the aggregate/matrix interface obtained by nanoindentation was increased by the LHA interfacial layers which promoted the crack deflection and branching in the interface and inhibit the cracks cross through the aggregates.
{"title":"Enhanced thermal shock resistance of corundum-spinel castables by dip-coating of platelet-like lanthanum hexa-aluminate on corundum aggregates","authors":"Yuan Feng, Donghai Ding, Guoqing Xiao, Endong Jin, Xing Hou, Xuan Jia","doi":"10.1016/j.jeurceramsoc.2025.117216","DOIUrl":"10.1016/j.jeurceramsoc.2025.117216","url":null,"abstract":"<div><div>The interface between the aggregates and matrix in corundum-spinel castables plays a crucial role in the thermal shock resistance. The lanthanum hexa-aluminate (LHA) interfacial layer between aggregates and matrix were prepared by dip-coating and heat-treatment. The microstructural evolution of the LHA interfacial layer and its effect on the thermal shock resistance of castables were investigated. The results indicated that the highest amount of platelet-like LHA crystals was formed after heat-treatment at 1600 ℃. The thermal shock resistance of the castables was significantly enhanced by the LHA interfacial layer, with the optimal residual strength ratio at 1600 ℃. The residual strength ratio after 3 thermal shock cycles were improved by 166 %. The specific fracture energy of the aggregate/matrix interface obtained by nanoindentation was increased by the LHA interfacial layers which promoted the crack deflection and branching in the interface and inhibit the cracks cross through the aggregates.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 7","pages":"Article 117216"},"PeriodicalIF":5.8,"publicationDate":"2025-01-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143171911","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-13DOI: 10.1016/j.jeurceramsoc.2025.117207
Wanqiang Yue , Xiuyi Zhao , Zhan Wang , Chao Wang , Xuefeng Lu , Feng Liu , Shiying Liu , Yusheng Wu , Zhanjie Wang
The advanced high entropy rare earth (RE) silicates achieving versatile property optimization as thermal/environmental barrier coatings (T/EBCs) is crucial to protect SiC-based ceramic composites as hot-section components in aero-engines. In this work, we simulated the structure of T/EBCs and designed high entropy (4RE0.25)2Si2O7/(4RE0.25)2SiO5 (RE= Yb, Y, Er and Sc) multiphase ceramics, as so to explore the relationship of structural regulation of multiphase ceramics with thermal properties and molten calcium–magnesium–aluminosilicate (CMAS) corrosion resistance. The results showed that the interaction of (4RE0.25)2Si2O7 and (4RE0.25)2SiO5 can not only influence the crystal structures such as the bond length and the lattice distortion, but also change the interface structure and produce the amorphous phase at the interface due to the interfacial stress, leading to reduction in thermal conductivity. Moreover, the coupling effect of different dissolution rates of (4RE0.25)2Si2O7 and (4RE0.25)2SiO5 can significantly improve high temperature CMAS corrosion resistance, and the corrosive depth was only about 150μm after CMAS corroding at 1500 °C for 48 h. This work also illustrates an efficient and reliable theoretical basis and guidelines in accelerating the design of next-generation T/EBCs.
{"title":"Structural design and CMAS corrosion resistance of high entropy RE silicate multiphase ceramics as next-generation thermal/environmental barrier coatings","authors":"Wanqiang Yue , Xiuyi Zhao , Zhan Wang , Chao Wang , Xuefeng Lu , Feng Liu , Shiying Liu , Yusheng Wu , Zhanjie Wang","doi":"10.1016/j.jeurceramsoc.2025.117207","DOIUrl":"10.1016/j.jeurceramsoc.2025.117207","url":null,"abstract":"<div><div>The advanced high entropy rare earth (RE) silicates achieving versatile property optimization as thermal/environmental barrier coatings (T/EBCs) is crucial to protect SiC-based ceramic composites as hot-section components in aero-engines. In this work, we simulated the structure of T/EBCs and designed high entropy (4RE<sub>0.25</sub>)<sub>2</sub>Si<sub>2</sub>O<sub>7</sub>/(4RE<sub>0.25</sub>)<sub>2</sub>SiO<sub>5</sub> (RE= Yb, Y, Er and Sc) multiphase ceramics, as so to explore the relationship of structural regulation of multiphase ceramics with thermal properties and molten calcium–magnesium–aluminosilicate (CMAS) corrosion resistance. The results showed that the interaction of (4RE<sub>0.25</sub>)<sub>2</sub>Si<sub>2</sub>O<sub>7</sub> and (4RE<sub>0.25</sub>)<sub>2</sub>SiO<sub>5</sub> can not only influence the crystal structures such as the bond length and the lattice distortion, but also change the interface structure and produce the amorphous phase at the interface due to the interfacial stress, leading to reduction in thermal conductivity. Moreover, the coupling effect of different dissolution rates of (4RE<sub>0.25</sub>)<sub>2</sub>Si<sub>2</sub>O<sub>7</sub> and (4RE<sub>0.25</sub>)<sub>2</sub>SiO<sub>5</sub> can significantly improve high temperature CMAS corrosion resistance, and the corrosive depth was only about 150μm after CMAS corroding at 1500 °C for 48 h. This work also illustrates an efficient and reliable theoretical basis and guidelines in accelerating the design of next-generation T/EBCs.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 6","pages":"Article 117207"},"PeriodicalIF":5.8,"publicationDate":"2025-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143156185","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-13DOI: 10.1016/j.jeurceramsoc.2025.117215
Chang Li , Qian Liu , Xiao Tan , Xin You , Chongsheng Wu , Tianpeng Liang , Yuanming Lai
The magnetic and structural characteristics of W-type hexaferrites (BaW) are explored to evaluate their potential use in a self-biased circulator. An orientation degree as high as 0.54 is obtained through magnetic field orientation. The corresponding remanence ratio Mr/Ms reaches 0.79, which is beneficial for restraining low-field loss and reducing insertion loss of the circulator. Gd3 +–Mg2+ substitution is introduced to tailor the magnetic properties of BaW for applications in different frequencies. When the substitution content x is 0.10, BaW achieves high saturation magnetization (Ms= 71.73 emu/g), high remanence ratio, high coercivity (Hc= 3809 Oe), and appropriate magnetocrystalline anisotropy field (Ha= 7935 Oe). The ferromagnetic resonance (FMR) is successfully detected with a linewidth of 962 Oe at 44 GHz. Based on this adjusted BaW material, a double Y-junction self-biased circulator with well K-band circulation is designed.
{"title":"Microstructure and gyromagnetic properties of oriented polycrystalline W-type hexaferrite applied to a self-biased circulator at the K-band","authors":"Chang Li , Qian Liu , Xiao Tan , Xin You , Chongsheng Wu , Tianpeng Liang , Yuanming Lai","doi":"10.1016/j.jeurceramsoc.2025.117215","DOIUrl":"10.1016/j.jeurceramsoc.2025.117215","url":null,"abstract":"<div><div>The magnetic and structural characteristics of W-type hexaferrites (BaW) are explored to evaluate their potential use in a self-biased circulator. An orientation degree as high as 0.54 is obtained through magnetic field orientation. The corresponding remanence ratio <em>M</em><sub><em>r</em></sub><em>/M</em><sub><em>s</em></sub> reaches 0.79, which is beneficial for restraining low-field loss and reducing insertion loss of the circulator. Gd<sup>3 +</sup>–Mg<sup>2+</sup> substitution is introduced to tailor the magnetic properties of BaW for applications in different frequencies. When the substitution content x is 0.10, BaW achieves high saturation magnetization (<em>M</em><sub><em>s</em></sub>= 71.73 emu/g), high remanence ratio, high coercivity (<em>H</em><sub><em>c</em></sub>= 3809 Oe), and appropriate magnetocrystalline anisotropy field (<em>H</em><sub><em>a</em></sub>= 7935 Oe). The ferromagnetic resonance (FMR) is successfully detected with a linewidth of 962 Oe at 44 GHz. Based on this adjusted BaW material, a double Y-junction self-biased circulator with well K-band circulation is designed.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 6","pages":"Article 117215"},"PeriodicalIF":5.8,"publicationDate":"2025-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143156188","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-13DOI: 10.1016/j.jeurceramsoc.2025.117206
Millicent Appiah , Yixin Yang , Burhan Ullah , Yuting Xiao , Daniel Q. Tan
This study introduces an innovative sample fabrication process aimed at optimizing the properties of Mg2Al4(Si0.8Ge0.2)5O18 cordierite ceramics. The strategic via TiO2-suspension, utilizes the core principles of liquid phase redistribution and particles rearrangement, to facilitate optimal densification through liquid phase sintering, thereby establishing a relationship among processing, microstructure, and material performance. The resulting composite ceramics, designated as MASG0.2 + y wt%TiO2, underwent annealing, achieving an impressive near-zero temperature coefficient of frequency (TCF) of + 1.99ppm/℃, a low relative permittivity (εr) ≤ 5.4, and a high-quality factor (Q × f ∼ 106,912 GHz) at y = 4 wt%. The microstructural analysis and Raman spectroscopy confirmed the significant influence of annealing on the dielectric properties. The novel inclusion of machine-learning predictive analytics to this work, enabled the achievement of an unprecedented near-zero TCF of −0.01 ppm/℃ and a Q × f value of ∼112,824 GHz (∼4.3 wt% TiO2), demonstrating a significant advancement in cordierite dielectrics for next-generation millimeter-wave applications.
{"title":"Exceptionally optimized millimeter-wave properties of cordierite-based materials via innovative processing and predictive analytics","authors":"Millicent Appiah , Yixin Yang , Burhan Ullah , Yuting Xiao , Daniel Q. Tan","doi":"10.1016/j.jeurceramsoc.2025.117206","DOIUrl":"10.1016/j.jeurceramsoc.2025.117206","url":null,"abstract":"<div><div>This study introduces an innovative sample fabrication process aimed at optimizing the properties of Mg<sub>2</sub>Al<sub>4</sub>(Si<sub>0.8</sub>Ge<sub>0.2</sub>)<sub>5</sub>O<sub>18</sub> cordierite ceramics. The strategic via TiO<sub>2</sub>-suspension, utilizes the core principles of liquid phase redistribution and particles rearrangement, to facilitate optimal densification through liquid phase sintering, thereby establishing a relationship among processing, microstructure, and material performance. The resulting composite ceramics, designated as MASG<sub>0.2</sub> + y wt%TiO<sub>2</sub>, underwent annealing, achieving an impressive near-zero temperature coefficient of frequency (TCF) of + 1.99ppm/℃, a low relative permittivity (ε<sub>r</sub>) ≤ 5.4, and a high-quality factor (Q × f ∼ 106,912 GHz) at y = 4 wt%. The microstructural analysis and Raman spectroscopy confirmed the significant influence of annealing on the dielectric properties. The novel inclusion of machine-learning predictive analytics to this work, enabled the achievement of an unprecedented near-zero TCF of −0.01 ppm/℃ and a Q × f value of ∼112,824 GHz (∼4.3 wt% TiO<sub>2</sub>), demonstrating a significant advancement in cordierite dielectrics for next-generation millimeter-wave applications.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 6","pages":"Article 117206"},"PeriodicalIF":5.8,"publicationDate":"2025-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143156519","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-13DOI: 10.1016/j.jeurceramsoc.2025.117208
Zhixiong Huang , Shaoxiong Weng , Minxian Shi , Zongyi Deng
Carbon fiber/boron phenolic resin composites are candidate thermal protection materials for hypersonic vehicles yet exhibit poor oxidation resistance and high-temperature load-bearing capacity. Herein, a novel Ti3SiC2 modified ceramizable composite was fabricated via a facile prepreg hot-pressing technique. After static aerobic ablation from 600 to 1600 °C for 20 min, the flexural strength kept above 40 MPa, indicating an excellent long-term oxidation resistance and high-temperature load-bearing capacity over a wide temperature range. The ceramizable filler and boron phenolic resin (BPR) was oxidized and in-situ converted into ceramized composite during ablation. Dense B-C-O-Si-Ti multiphase ceramic layers were in-situ formed, which functioned as oxygen barriers and self-healing agents.
{"title":"Long-term oxidation resistance and high-temperature load-bearing capacity of ceramizable composite modified by Ti3SiC2 from 600 °C to 1600 °C","authors":"Zhixiong Huang , Shaoxiong Weng , Minxian Shi , Zongyi Deng","doi":"10.1016/j.jeurceramsoc.2025.117208","DOIUrl":"10.1016/j.jeurceramsoc.2025.117208","url":null,"abstract":"<div><div>Carbon fiber/boron phenolic resin composites are candidate thermal protection materials for hypersonic vehicles yet exhibit poor oxidation resistance and high-temperature load-bearing capacity. Herein, a novel Ti<sub>3</sub>SiC<sub>2</sub> modified ceramizable composite was fabricated via a facile prepreg hot-pressing technique. After static aerobic ablation from 600 to 1600 °C for 20 min, the flexural strength kept above 40 MPa, indicating an excellent long-term oxidation resistance and high-temperature load-bearing capacity over a wide temperature range. The ceramizable filler and boron phenolic resin (BPR) was oxidized and in-situ converted into ceramized composite during ablation. Dense B-C-O-Si-Ti multiphase ceramic layers were in-situ formed, which functioned as oxygen barriers and self-healing agents.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 6","pages":"Article 117208"},"PeriodicalIF":5.8,"publicationDate":"2025-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143156520","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-12DOI: 10.1016/j.jeurceramsoc.2025.117205
Xinlei Wang , Xiaomeng Fan , Yongpeng Dong , Haohui Hao , Jimei Xue , Fang Ye
SiCf/Si3N4 composites have the potential to be high-temperature absorbing materials, but the impedance mismatch caused by the high dielectric properties leads to narrow absorption bandwidth. Herein, the strategy of combing the high dielectric properties of SiCf/Si3N4 with a periodic structure design was proposed to broaden the absorption bandwidth. The honeycomb structure of the fiber preform was firstly prepared by integrated molding, and the BN interphase and Si3N4 matrix were prepared by chemical vapor infiltration to obtain honeycomb structure SiCf/Si3N4. Through structural parameter design, the effective absorption bandwidth (reflection loss ≤ −10 dB) can achieve 13.1 GHz (4.9–18 GHz) at 25 °C, and it remained 10.5 GHz (7.1–17.6 GHz) when the temperature increases to 1000 °C. The excellent broadband absorption performance is attributed to the high loss ability of SiCf/Si3N4 and the improved impedance matching provided by the honeycomb structure.
{"title":"Honeycomb structure SiCf/Si3N4 composite with broadband electromagnetic absorption performance under a wide temperature range","authors":"Xinlei Wang , Xiaomeng Fan , Yongpeng Dong , Haohui Hao , Jimei Xue , Fang Ye","doi":"10.1016/j.jeurceramsoc.2025.117205","DOIUrl":"10.1016/j.jeurceramsoc.2025.117205","url":null,"abstract":"<div><div>SiC<sub>f</sub>/Si<sub>3</sub>N<sub>4</sub> composites have the potential to be high-temperature absorbing materials, but the impedance mismatch caused by the high dielectric properties leads to narrow absorption bandwidth. Herein, the strategy of combing the high dielectric properties of SiC<sub>f</sub>/Si<sub>3</sub>N<sub>4</sub> with a periodic structure design was proposed to broaden the absorption bandwidth. The honeycomb structure of the fiber preform was firstly prepared by integrated molding, and the BN interphase and Si<sub>3</sub>N<sub>4</sub> matrix were prepared by chemical vapor infiltration to obtain honeycomb structure SiC<sub>f</sub>/Si<sub>3</sub>N<sub>4</sub>. Through structural parameter design, the effective absorption bandwidth (reflection loss ≤ −10 dB) can achieve 13.1 GHz (4.9–18 GHz) at 25 °C, and it remained 10.5 GHz (7.1–17.6 GHz) when the temperature increases to 1000 °C. The excellent broadband absorption performance is attributed to the high loss ability of SiC<sub>f</sub>/Si<sub>3</sub>N<sub>4</sub> and the improved impedance matching provided by the honeycomb structure.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 6","pages":"Article 117205"},"PeriodicalIF":5.8,"publicationDate":"2025-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143100834","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-11DOI: 10.1016/j.jeurceramsoc.2025.117192
Kun Huang, Zi-Yuan Wang, Tian-Yu Zhong, Yi-Xin Zhang, Lan Yu, Xi Yan, Ye-Hua Jiang, Zhen-Hua Ge, Jing Feng
Bulk materials composed of n-type Bi2Se2S were synthesized through a solid-state reaction using spark plasma sintering technology. To improve the electrical conductivity of Bi2Se2S, SbCl3 was employed as a dopant to increase the electron concentration. The power factor of the Bi2Se2S + 0.75 wt% SbCl3 sample reached 659 μWm−1K−2, three times higher than that of the pristine sample. Surprisingly, their thermoelectric properties were considerably enhanced by designing multi-scale multiphase engineering, the addition of SbCl3 resulted in the in situ precipitation of mesoscopic and nanoscale second phases, intermingling with the matrix. These multiscale second phases effectively scatter phonons across the full wavelength range, thereby reducing the lattice thermal conductivity. The lowest lattice thermal conductivity, 0.27 Wm−1K−1 at 773 K, was achieved for the Bi2Se2S + 0.75 wt% SbCl3 sample. Due to the synergistic optimization of electrical and thermal properties, the figure of merit (ZT) for the SbCl3-doped Bi2Se2S sample reached 1.13 at 773 K. This value is a record high in the Bi–Se–S system and is the first time a ZT value beyond 1 has been achieved for the Bi2Se2S system, indicating that Bi2Se2S is a highly promising thermoelectric material for medium-temperature applications.
{"title":"N-type Bi2Se2S materials with high ZT > 1 engineered by multi-scale second phases designing","authors":"Kun Huang, Zi-Yuan Wang, Tian-Yu Zhong, Yi-Xin Zhang, Lan Yu, Xi Yan, Ye-Hua Jiang, Zhen-Hua Ge, Jing Feng","doi":"10.1016/j.jeurceramsoc.2025.117192","DOIUrl":"10.1016/j.jeurceramsoc.2025.117192","url":null,"abstract":"<div><div>Bulk materials composed of n-type Bi<sub>2</sub>Se<sub>2</sub>S were synthesized through a solid-state reaction using spark plasma sintering technology. To improve the electrical conductivity of Bi<sub>2</sub>Se<sub>2</sub>S, SbCl<sub>3</sub> was employed as a dopant to increase the electron concentration. The power factor of the Bi<sub>2</sub>Se<sub>2</sub>S + 0.75 wt% SbCl<sub>3</sub> sample reached 659 μWm<sup>−1</sup>K<sup>−2</sup>, three times higher than that of the pristine sample. Surprisingly, their thermoelectric properties were considerably enhanced by designing multi-scale multiphase engineering, the addition of SbCl<sub>3</sub> resulted in the in situ precipitation of mesoscopic and nanoscale second phases, intermingling with the matrix. These multiscale second phases effectively scatter phonons across the full wavelength range, thereby reducing the lattice thermal conductivity. The lowest lattice thermal conductivity, 0.27 Wm<sup>−1</sup>K<sup>−1</sup> at 773 K, was achieved for the Bi<sub>2</sub>Se<sub>2</sub>S + 0.75 wt% SbCl<sub>3</sub> sample. Due to the synergistic optimization of electrical and thermal properties, the figure of merit (<em>ZT</em>) for the SbCl<sub>3</sub>-doped Bi<sub>2</sub>Se<sub>2</sub>S sample reached 1.13 at 773 K. This value is a record high in the Bi–Se–S system and is the first time a <em>ZT</em> value beyond 1 has been achieved for the Bi<sub>2</sub>Se<sub>2</sub>S system, indicating that Bi<sub>2</sub>Se<sub>2</sub>S is a highly promising thermoelectric material for medium-temperature applications.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 6","pages":"Article 117192"},"PeriodicalIF":5.8,"publicationDate":"2025-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143157194","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-11DOI: 10.1016/j.jeurceramsoc.2025.117204
Juan Wang , Yongzhao Yang , Lijuan Zhou , Feng Hu , Peng Wang , Wuhong Xin , Fushun Yu , Shuang Li
Silicon carbide (SiC) ceramic membranes fabricated by recrystallization sintering can be used in some harsh environments because of their remarkable chemical and thermal stabilities. However, the commercial membranes can only meet the demands of microfiltration applications because of the challenge in pore-size control during recrystallization sintering. Here, a SiC ultrafiltration membrane with triple-layer asymmetric structures was prepared with micro-scale SiC particles for the substrate and nano-scale SiC particles for the selective layer. Defects-free selective layers were successfully coated on the high-purity SiC substrate by spin coating. The average pore size of the membrane was 60 nm when sintered at 1300 ℃. The surface roughness of the membrane increased with the increase in sintering temperature, leading to the improvement in hydrophilicity. Oil-in-water emulsion filtration analysis found that the oil rejection of the membrane exceeded 99.9 %. Thus, this SiC UF membrane provides new possibility to treat the corrosive and oily wastewaters.
{"title":"High-purity SiC ultrafiltration membrane with triple-layer asymmetric structures constructed from multiscale SiC powders","authors":"Juan Wang , Yongzhao Yang , Lijuan Zhou , Feng Hu , Peng Wang , Wuhong Xin , Fushun Yu , Shuang Li","doi":"10.1016/j.jeurceramsoc.2025.117204","DOIUrl":"10.1016/j.jeurceramsoc.2025.117204","url":null,"abstract":"<div><div>Silicon carbide (SiC) ceramic membranes fabricated by recrystallization sintering can be used in some harsh environments because of their remarkable chemical and thermal stabilities. However, the commercial membranes can only meet the demands of microfiltration applications because of the challenge in pore-size control during recrystallization sintering. Here, a SiC ultrafiltration membrane with triple-layer asymmetric structures was prepared with micro-scale SiC particles for the substrate and nano-scale SiC particles for the selective layer. Defects-free selective layers were successfully coated on the high-purity SiC substrate by spin coating. The average pore size of the membrane was 60 nm when sintered at 1300 ℃. The surface roughness of the membrane increased with the increase in sintering temperature, leading to the improvement in hydrophilicity. Oil-in-water emulsion filtration analysis found that the oil rejection of the membrane exceeded 99.9 %. Thus, this SiC UF membrane provides new possibility to treat the corrosive and oily wastewaters.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 6","pages":"Article 117204"},"PeriodicalIF":5.8,"publicationDate":"2025-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143156923","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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