Pub Date : 2026-01-29DOI: 10.1016/j.jeurceramsoc.2026.118187
Xingrui Pu , Xing Cheng , Ruize Yang , Chengzhi Wei , Xinhang Chu , Xiaohong Zhu
The large grain boundary resistance restricts conductivity of LiZr2(PO4)3 (LZP) ceramic electrolyte. This work presents an effective and simple screening technique for quickly screening out appropriate sintering aids to overcome this disadvantage. Firstly, Bi2O3 (BO), Li3BO3 (LBO) and LiBF4 (LBF) were selected from fourteen candidates as sintering aids for Li0.94Zr1.94Ta0.06(PO4)3 (LZTP) electrolyte. The correlations between phase, relative density, microstructure, composition and conductivity are discussed. The total conductivity of LZTP-0.5 wt%LBO is 8.60 × 10−5 S cm−1. LZTP-2wt%BO reaches the highest conductivity of 9.24 × 10−5 S cm−1, which is approximately 1.5 times that of pure LZTP. The reason for the total conductivity enhancement is mainly attributed to the enhancement of grain boundary transport. However, compared to BO and LBO, the LBF sintering aid exhibited negative effects on conductivity. The lithium symmetrical cell equipped with LZTP-2wt%BO exhibits a long cycle stability for 900 h. This screening strategy can provide reference and inspiration for the selection of sintering aids for other LZP-based ceramic electrolytes.
较大的晶界电阻限制了lizzr2 (PO4)3 （LZP）陶瓷电解质的导电性。这项工作提出了一种有效和简单的筛选技术，可以快速筛选出合适的烧结助剂，以克服这一缺点。首先，从14种候选材料中选择Bi2O3 （BO）、Li3BO3 （LBO）和LiBF4 （LBF）作为Li0.94Zr1.94Ta0.06(PO4)3 （LZTP）电解质的助烧剂。讨论了相、相对密度、显微组织、成分和电导率之间的关系。LZTP-0.5 wt%LBO的总电导率为8.60 × 10−5 S cm−1。LZTP-2wt%BO的电导率最高，为9.24 × 10−5 S cm−1，约为纯LZTP的1.5倍。总电导率增强的主要原因是晶界输运的增强。但与BO和LBO相比，LBF助烧剂对电导率有负面影响。LZTP-2wt%BO的锂对称电池具有900 h的长周期稳定性。该筛选策略可为其他lzp基陶瓷电解质助烧剂的选择提供参考和启示。
{"title":"A simple method for selecting suitable sintering aids for LZP-based ceramic electrolytes to improve lithium-ion conductivity","authors":"Xingrui Pu , Xing Cheng , Ruize Yang , Chengzhi Wei , Xinhang Chu , Xiaohong Zhu","doi":"10.1016/j.jeurceramsoc.2026.118187","DOIUrl":"10.1016/j.jeurceramsoc.2026.118187","url":null,"abstract":"<div><div>The large grain boundary resistance restricts conductivity of LiZr<sub>2</sub>(PO<sub>4</sub>)<sub>3</sub> (LZP) ceramic electrolyte. This work presents an effective and simple screening technique for quickly screening out appropriate sintering aids to overcome this disadvantage. Firstly, Bi<sub>2</sub>O<sub>3</sub> (BO), Li<sub>3</sub>BO<sub>3</sub> (LBO) and LiBF<sub>4</sub> (LBF) were selected from fourteen candidates as sintering aids for Li<sub>0.94</sub>Zr<sub>1.94</sub>Ta<sub>0.06</sub>(PO<sub>4</sub>)<sub>3</sub> (LZTP) electrolyte. The correlations between phase, relative density, microstructure, composition and conductivity are discussed. The total conductivity of LZTP-0.5 wt%LBO is 8.60 × 10<sup>−5</sup> S cm<sup>−1</sup>. LZTP-2wt%BO reaches the highest conductivity of 9.24 × 10<sup>−5</sup> S cm<sup>−1</sup>, which is approximately 1.5 times that of pure LZTP. The reason for the total conductivity enhancement is mainly attributed to the enhancement of grain boundary transport. However, compared to BO and LBO, the LBF sintering aid exhibited negative effects on conductivity. The lithium symmetrical cell equipped with LZTP-2wt%BO exhibits a long cycle stability for 900 h. This screening strategy can provide reference and inspiration for the selection of sintering aids for other LZP-based ceramic electrolytes.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"46 8","pages":"Article 118187"},"PeriodicalIF":6.2,"publicationDate":"2026-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146080449","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 : 2026-01-29DOI: 10.1016/j.jeurceramsoc.2026.118188
Youle Liu , Yufeng Zhang , Yucheng Zhang , Hongkun Li , Jianqiu Zhu , Ze Liu , Peng Du , Xiao Lin , Jian Qiang Wang , Linjuan Zhang
Protonic ceramic fuel cells (PCFCs) are promising energy conversion devices but often degrade due to Ni agglomeration at elevated temperatures. Here, we report an interface-engineering strategy by incorporating optimized ceria (CeO2, 7.5 wt%) into the Ni–BZCYYb anode functional layer via scalable tape casting. The CeO2-modified cell delivers a peak power density of 1.427 W cm−2 at 650 °C, a 10.19 % improvement over the reference. Under galvanostatic operation at 1 A cm−2, the voltage decay is only 2.87 % after 400 h, compared with 7.72 % for the reference. EIS and FIB-SEM quantification show suppressed Ni coarsening with a finer microstructure and higher TPB density. The results support a dual-stage contribution of CeO2 to stabilization during sintering and long-term operation, with atomistic insights further supported by reported DFT/KMC literature. This work presents a feasible industrial strategy to significantly enhance both performance and durability of proton-conducting ceramic cells through targeted interfacial modification.
质子陶瓷燃料电池（pcfc）是一种很有前途的能量转换器件，但由于高温下镍的聚集，质子陶瓷燃料电池往往会退化。在这里，我们报告了一种界面工程策略，通过可扩展的带铸造将优化的铈（CeO2, 7.5 wt%）纳入Ni-BZCYYb阳极功能层。在650°C时，ceo2修饰电池的峰值功率密度为1.427 W cm−2，比参考电池提高10.19 %。在1 A cm−2的恒流操作下，400 h后电压衰减仅为2.87 %，而参考电压衰减为7.72 %。EIS和FIB-SEM量化表明，Ni粗化受到抑制，其微观结构更细，TPB密度更高。研究结果支持了CeO2在烧结和长期运行过程中对稳定的双阶段贡献，并得到了DFT/KMC文献的进一步支持。本研究提出了一种可行的工业策略，通过有针对性的界面修饰来显著提高质子导电陶瓷电池的性能和耐久性。
{"title":"Microstructural and electrochemical stabilization of protonic ceramic cells by ceria interface engineering","authors":"Youle Liu , Yufeng Zhang , Yucheng Zhang , Hongkun Li , Jianqiu Zhu , Ze Liu , Peng Du , Xiao Lin , Jian Qiang Wang , Linjuan Zhang","doi":"10.1016/j.jeurceramsoc.2026.118188","DOIUrl":"10.1016/j.jeurceramsoc.2026.118188","url":null,"abstract":"<div><div>Protonic ceramic fuel cells (PCFCs) are promising energy conversion devices but often degrade due to Ni agglomeration at elevated temperatures. Here, we report an interface-engineering strategy by incorporating optimized ceria (CeO<sub>2</sub>, 7.5 wt%) into the Ni–BZCYYb anode functional layer via scalable tape casting. The CeO2-modified cell delivers a peak power density of 1.427 W cm<sup>−2</sup> at 650 °C, a 10.19 % improvement over the reference. Under galvanostatic operation at 1 A cm<sup>−2</sup>, the voltage decay is only 2.87 % after 400 h, compared with 7.72 % for the reference. EIS and FIB-SEM quantification show suppressed Ni coarsening with a finer microstructure and higher TPB density. The results support a dual-stage contribution of CeO<sub>2</sub> to stabilization during sintering and long-term operation, with atomistic insights further supported by reported DFT/KMC literature. This work presents a feasible industrial strategy to significantly enhance both performance and durability of proton-conducting ceramic cells through targeted interfacial modification.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"46 9","pages":"Article 118188"},"PeriodicalIF":6.2,"publicationDate":"2026-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146191684","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 : 2026-01-28DOI: 10.1016/j.jeurceramsoc.2026.118186
Zhennan Xu , Dongmei He , Jiaxiang Xue , Zhengmao Yang , Zhaoke Chen , Liqiang Zhang , Xiang Xiong
SiCf/SiC composite claddings have emerged as a revolutionary solution for future nuclear fuel cladding owing to their exceptional properties. However, the extreme thermal environment during service presents significant challenges to their structural integrity and performance stability. This study investigates the microstructural evolution and mechanical degradation behavior of two-layer SiCf/SiC composite claddings following heat treatment at 1200–1500℃ with holding times of 1 and 10 h. Results indicate that moderate heat treatment (≤1300℃ for 1 h) can optimize the cladding microstructure by enhancing β-SiC crystallinity and effectively relieving residual stresses within fibers and matrix. However, as the heat treatment temperature increases and the holding time extends, varying degrees of damage occur in the fibers, interfaces, and matrix of the SiCf/SiC composite cladding, except for the coating, leading to significant mechanical degradation. After heat treatment at 1500℃ for 10 h, the radial strength retention of the cladding fell below 80 %, and the axial strength retention decreased to 58.6 %.
{"title":"Effect of heat treatment on the microstructure and mechanical properties of SiCf/SiC composite cladding","authors":"Zhennan Xu , Dongmei He , Jiaxiang Xue , Zhengmao Yang , Zhaoke Chen , Liqiang Zhang , Xiang Xiong","doi":"10.1016/j.jeurceramsoc.2026.118186","DOIUrl":"10.1016/j.jeurceramsoc.2026.118186","url":null,"abstract":"<div><div>SiC<sub>f</sub>/SiC composite claddings have emerged as a revolutionary solution for future nuclear fuel cladding owing to their exceptional properties. However, the extreme thermal environment during service presents significant challenges to their structural integrity and performance stability. This study investigates the microstructural evolution and mechanical degradation behavior of two-layer SiC<sub>f</sub>/SiC composite claddings following heat treatment at 1200–1500℃ with holding times of 1 and 10 h. Results indicate that moderate heat treatment (≤1300℃ for 1 h) can optimize the cladding microstructure by enhancing β-SiC crystallinity and effectively relieving residual stresses within fibers and matrix. However, as the heat treatment temperature increases and the holding time extends, varying degrees of damage occur in the fibers, interfaces, and matrix of the SiC<sub>f</sub>/SiC composite cladding, except for the coating, leading to significant mechanical degradation. After heat treatment at 1500℃ for 10 h, the radial strength retention of the cladding fell below 80 %, and the axial strength retention decreased to 58.6 %.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"46 8","pages":"Article 118186"},"PeriodicalIF":6.2,"publicationDate":"2026-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146080534","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 : 2026-01-27DOI: 10.1016/j.jeurceramsoc.2026.118166
Mengrui Li , Xianmeng Chen , Boon Xian Chai , Guibing Shi , M. Akbar Rhamdhani , Li Wang , Shanqing Xu
This study proposes a novel CaTiO3 (CTO) doping strategy for MnZn ferrites to co-incorporate Ca2+ and Ti4+ ions, aiming to develop low power loss magnetic materials for megahertz-range frequency applications. The effects of CaTiO3 doping on power loss, cut-off frequency, and microstructure were systematically examined. As compared with traditional CaO and TiO2 doping, CaTiO3 doping enabled more uniform dopant distribution, refined grain structure, and enhanced electrical resistivity. Among all samples, the MnZn ferrites doped with CTO achieved an 87.5 % reduction in power loss (155 mW/cm3 at 1 MHz/30 mT/25 °C) relative to the undoped reference, while maintaining excellent magnetic performance. Loss separation analysis revealed that the major contribution to this improvement was the suppression of eddy current loss (Pe), complemented by reductions in hysteresis (Ph). This work demonstrates the great potential of CaTiO3 as a cost-effective, scalable, and efficient dopant for enhancing the high-frequency performance of MnZn ferrites in next-generation power electronics.
{"title":"Introduction of Ca2+ and Ti4+ ions by a novel additive CaTiO3 for manufacturing low power loss MnZn ferrites","authors":"Mengrui Li , Xianmeng Chen , Boon Xian Chai , Guibing Shi , M. Akbar Rhamdhani , Li Wang , Shanqing Xu","doi":"10.1016/j.jeurceramsoc.2026.118166","DOIUrl":"10.1016/j.jeurceramsoc.2026.118166","url":null,"abstract":"<div><div>This study proposes a novel CaTiO<sub>3</sub> (CTO) doping strategy for MnZn ferrites to co-incorporate Ca<sup>2+</sup> and Ti<sup>4+</sup> ions, aiming to develop low power loss magnetic materials for megahertz-range frequency applications. The effects of CaTiO<sub>3</sub> doping on power loss, cut-off frequency, and microstructure were systematically examined. As compared with traditional CaO and TiO<sub>2</sub> doping, CaTiO<sub>3</sub> doping enabled more uniform dopant distribution, refined grain structure, and enhanced electrical resistivity. Among all samples, the MnZn ferrites doped with CTO achieved an 87.5 % reduction in power loss (155 mW/cm<sup>3</sup> at 1 MHz/30 mT/25 °C) relative to the undoped reference, while maintaining excellent magnetic performance. Loss separation analysis revealed that the major contribution to this improvement was the suppression of eddy current loss (<em>P</em><sub><em>e</em></sub>), complemented by reductions in hysteresis (<em>P</em><sub><em>h</em></sub>). This work demonstrates the great potential of CaTiO<sub>3</sub> as a cost-effective, scalable, and efficient dopant for enhancing the high-frequency performance of MnZn ferrites in next-generation power electronics.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"46 8","pages":"Article 118166"},"PeriodicalIF":6.2,"publicationDate":"2026-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146079970","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 : 2026-01-27DOI: 10.1016/j.jeurceramsoc.2026.118172
Julian Fanghanel , Satoshi Yokomizo , Shuichi Funahashi , Jeffrey Shallenberger , Ke Wang , Sophie Guillemet-Fritsch , Clive A. Randall
Cold sintering using eutectic molten salts transient chemistries presents a promising low-temperature route for fabricating NiMn2O4 based NTC thermistors without the need for conventional high-temperature sintering. In this work, we explore the use of a LiCl–LiI flux to densify NiMn2O4 at just 400 °C, achieving > 95 % relative density and preserving the spinel with minor impurities that are largely erased after a brief post anneal at 850 °C. While initial electrical properties of the cold-sintered parts are influenced by a flux-mediated reduction and cation inversion segregation, we show that a mild anneal at 850 °C is sufficient to restore a more stable thermistor. Here we argue that the transient phase of LiCl–LiI drives a cation-Frenkel–dominated reduction during the densification: transient dissolution/precipitation and halide redox promote formation of metal interstitials (Nii,Mni) paired with cation vacancies on the normal sublattices, with a valence shifts (Mn4+→Mn3+). We also report that, in the absence of annealing, these samples undergo a negative aging with a decrease in resistance over time, further supporting the role of the flux modifying the oxidation state and site occupancy. These results demonstrate that cold sintering, when paired with strategic annealing, can produce high thermistor performance with a thermally stable NTC ceramics at a fraction of the processing energy and temperature, with tunable electrical properties driven by the molten salt flux chemistry.
{"title":"Cold-sintered NiMn2O4 thermistors: An electrical aging and recovery study","authors":"Julian Fanghanel , Satoshi Yokomizo , Shuichi Funahashi , Jeffrey Shallenberger , Ke Wang , Sophie Guillemet-Fritsch , Clive A. Randall","doi":"10.1016/j.jeurceramsoc.2026.118172","DOIUrl":"10.1016/j.jeurceramsoc.2026.118172","url":null,"abstract":"<div><div>Cold sintering using eutectic molten salts transient chemistries presents a promising low-temperature route for fabricating NiMn<sub>2</sub>O<sub>4</sub> based NTC thermistors without the need for conventional high-temperature sintering. In this work, we explore the use of a LiCl–LiI flux to densify NiMn<sub>2</sub>O<sub>4</sub> at just 400 °C, achieving > 95 % relative density and preserving the spinel with minor impurities that are largely erased after a brief post anneal at 850 °C. While initial electrical properties of the cold-sintered parts are influenced by a flux-mediated reduction and cation inversion segregation, we show that a mild anneal at 850 °C is sufficient to restore a more stable thermistor. Here we argue that the transient phase of LiCl–LiI drives a cation-Frenkel–dominated reduction during the densification: transient dissolution/precipitation and halide redox promote formation of metal interstitials (Ni<sub>i</sub>,Mn<sub>i</sub>) paired with cation vacancies on the normal sublattices, with a valence shifts (Mn<sup>4</sup><sup>+</sup>→Mn<sup>3+</sup>). We also report that, in the absence of annealing, these samples undergo a negative aging with a decrease in resistance over time, further supporting the role of the flux modifying the oxidation state and site occupancy. These results demonstrate that cold sintering, when paired with strategic annealing, can produce high thermistor performance with a thermally stable NTC ceramics at a fraction of the processing energy and temperature, with tunable electrical properties driven by the molten salt flux chemistry.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"46 8","pages":"Article 118172"},"PeriodicalIF":6.2,"publicationDate":"2026-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146080445","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 : 2026-01-27DOI: 10.1016/j.jeurceramsoc.2026.118181
Shuping Wen , Wei Hu , Zhilin Chen , Zhilin Tian , Jijin Huang , Liya Zheng , Bin Li
SiO2f/SiO2 composites have significant potential in radome applications. However, traditional 2D weaving suffers from weak interlayer bonding, while 2.5D and 3D weaving are costly. To overcome these limitations, a laminated puncture reinforcement architecture was introduced into SiO2f/SiO2 composites. The results show that the laminated puncture structure effectively enhances the load-bearing capability, achieving flexural and compressive strengths of 93 MPa and 146 MPa, respectively. Digital image correlation (DIC) analysis confirms that the Z-directional fibers suppress shear-band propagation and delay catastrophic failure. Furthermore, the composites demonstrate excellent ablation resistance with a linear rate of 0.151 mm/s and a mass rate of 0.088 g/s, governed by surface melting, volatilization, and mechanical erosion. In addition, stable electromagnetic transparency is maintained with a dielectric constant of approximately 3 and a dielectric loss tangent value below 0.004. This cost-efficient fabrication method delivers state-of-the-art comprehensive performance, enabling practical engineering applications.
{"title":"High-performance SiO2f/SiO2 wave-transparent composites based on laminated puncture method","authors":"Shuping Wen , Wei Hu , Zhilin Chen , Zhilin Tian , Jijin Huang , Liya Zheng , Bin Li","doi":"10.1016/j.jeurceramsoc.2026.118181","DOIUrl":"10.1016/j.jeurceramsoc.2026.118181","url":null,"abstract":"<div><div>SiO<sub>2f</sub>/SiO<sub>2</sub> composites have significant potential in radome applications. However, traditional 2D weaving suffers from weak interlayer bonding, while 2.5D and 3D weaving are costly. To overcome these limitations, a laminated puncture reinforcement architecture was introduced into SiO<sub>2f</sub>/SiO<sub>2</sub> composites. The results show that the laminated puncture structure effectively enhances the load-bearing capability, achieving flexural and compressive strengths of 93 MPa and 146 MPa, respectively. Digital image correlation (DIC) analysis confirms that the Z-directional fibers suppress shear-band propagation and delay catastrophic failure. Furthermore, the composites demonstrate excellent ablation resistance with a linear rate of 0.151 mm/s and a mass rate of 0.088 g/s, governed by surface melting, volatilization, and mechanical erosion. In addition, stable electromagnetic transparency is maintained with a dielectric constant of approximately 3 and a dielectric loss tangent value below 0.004. This cost-efficient fabrication method delivers state-of-the-art comprehensive performance, enabling practical engineering applications.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"46 8","pages":"Article 118181"},"PeriodicalIF":6.2,"publicationDate":"2026-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146080443","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 : 2026-01-27DOI: 10.1016/j.jeurceramsoc.2026.118178
Qicheng Li , Xiufang Cui , Zhuo Chen , Zhijia Zhang , Yuqi Dong , Shinan Hu , Shitong Chen , Tong Shang , Yongchao Fang , Guo Jin
Three high-entropy silicates were synthesized: (Y0.25Er0.25Yb0.25Lu0.25)2SiO5 (4HE), (Nd0.2Y0.2Er0.2Yb0.2Lu0.2)2SiO5 (NdHE), and (La0.2Y0.2Er0.2Yb0.2Lu0.2)2SiO5 (LaHE)，with systematic analysis of size disorder effects on crystal structure and phase composition. Using Y2SiO5 as a control, the corrosion resistance of these rare earth silicates was compared, and the influence of La3 + and Nd3+ doping on CMAS corrosion was analyzed. The research results demonstrate that La doping induces the formation of 7.51 wt% X1 phase due to high size disorder (δ = 0.0854), whereas NdHE maintains a nearly single-phase X2-type structure. NdHE exhibits the optimal CMAS corrosion resistance in isothermal CMAS corrosion experiments conducted at both 1400 ℃ and 1500 ℃. This is attributed to Nd3+ doping accelerating the precipitation of apatite-phase corrosion products and altering their growth orientation, thereby enabling rapid formation of a continuous, dense corrosion layer at the melt-substrate interface, which effectively impedes further rapid penetration of CMAS.
{"title":"Lattice engineering via large-radius cation doping: A novel strategy for CMAS-resistant high-entropy (Nd0.2Y0.2Er0.2Yb0.2Lu0.2)2SiO5","authors":"Qicheng Li , Xiufang Cui , Zhuo Chen , Zhijia Zhang , Yuqi Dong , Shinan Hu , Shitong Chen , Tong Shang , Yongchao Fang , Guo Jin","doi":"10.1016/j.jeurceramsoc.2026.118178","DOIUrl":"10.1016/j.jeurceramsoc.2026.118178","url":null,"abstract":"<div><div>Three high-entropy silicates were synthesized: (Y<sub>0.25</sub>Er<sub>0.25</sub>Yb<sub>0.25</sub>Lu<sub>0.25</sub>)<sub>2</sub>SiO<sub>5</sub> (4HE), (Nd<sub>0.2</sub>Y<sub>0.2</sub>Er<sub>0.2</sub>Yb<sub>0.2</sub>Lu<sub>0.2</sub>)<sub>2</sub>SiO<sub>5</sub> (NdHE), and (La<sub>0.2</sub>Y<sub>0.2</sub>Er<sub>0.2</sub>Yb<sub>0.2</sub>Lu<sub>0.2</sub>)<sub>2</sub>SiO<sub>5</sub> (LaHE)，with systematic analysis of size disorder effects on crystal structure and phase composition. Using Y<sub>2</sub>SiO<sub>5</sub> as a control, the corrosion resistance of these rare earth silicates was compared, and the influence of La<sup>3 +</sup> and Nd<sup>3+</sup> doping on CMAS corrosion was analyzed. The research results demonstrate that La doping induces the formation of 7.51 wt% X1 phase due to high size disorder (δ = 0.0854), whereas NdHE maintains a nearly single-phase X2-type structure. NdHE exhibits the optimal CMAS corrosion resistance in isothermal CMAS corrosion experiments conducted at both 1400 ℃ and 1500 ℃. This is attributed to Nd<sup>3+</sup> doping accelerating the precipitation of apatite-phase corrosion products and altering their growth orientation, thereby enabling rapid formation of a continuous, dense corrosion layer at the melt-substrate interface, which effectively impedes further rapid penetration of CMAS.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"46 8","pages":"Article 118178"},"PeriodicalIF":6.2,"publicationDate":"2026-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146079972","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 : 2026-01-27DOI: 10.1016/j.jeurceramsoc.2026.118177
Wanjie Sun , Jie Yu , Weiguo Wei , Xiao Jiang , Yan Zhang , Jiafeng Tang , Ying Liu , Lu Wang , Chang Liu
This study investigates the high-temperature oxidation behavior and tribological performance of a novel o-MAX Mo2VAlC2. The oxidation behavior of Mo2VAlC2 bulk materials within the range of room temperature to 800 ℃ was examined and analyzed by TGA-DSC, XRD, and XPS. The results revealed the multi-stage oxidation process of Mo2VAlC2, which exhibited good oxidation resistance below 600 ℃. As the temperature rises, the formation of volatile MoO3 leads to the catastrophic oxidation of Mo2VAlC2, eventually generating an oxide layer primarily composed of Al2(MoO4)3 with superior lubricating properties at 800 ℃. The coefficient of friction decreases significantly from 0.503 at room temperature to 0.210 at 800 ℃. Additionally, the wear mechanism changes from fatigue-abrasive wear to oxidation wear with increasing temperature. This study reveals the oxidation-tribological coupling behavior of Mo2VAlC2 and provides insights for designing MAX phases with enhanced high-temperature self-lubricating properties.
{"title":"Unraveling the high-temperature oxidation mechanism and its impact on tribological performance of Mo2VAlC2 MAX phase","authors":"Wanjie Sun , Jie Yu , Weiguo Wei , Xiao Jiang , Yan Zhang , Jiafeng Tang , Ying Liu , Lu Wang , Chang Liu","doi":"10.1016/j.jeurceramsoc.2026.118177","DOIUrl":"10.1016/j.jeurceramsoc.2026.118177","url":null,"abstract":"<div><div>This study investigates the high-temperature oxidation behavior and tribological performance of a novel <em>o</em>-MAX Mo<sub>2</sub>VAlC<sub>2</sub>. The oxidation behavior of Mo<sub>2</sub>VAlC<sub>2</sub> bulk materials within the range of room temperature to 800 ℃ was examined and analyzed by TGA-DSC, XRD, and XPS. The results revealed the multi-stage oxidation process of Mo<sub>2</sub>VAlC<sub>2</sub>, which exhibited good oxidation resistance below 600 ℃. As the temperature rises, the formation of volatile MoO<sub>3</sub> leads to the catastrophic oxidation of Mo<sub>2</sub>VAlC<sub>2</sub>, eventually generating an oxide layer primarily composed of Al<sub>2</sub>(MoO<sub>4</sub>)<sub>3</sub> with superior lubricating properties at 800 ℃. The coefficient of friction decreases significantly from 0.503 at room temperature to 0.210 at 800 ℃. Additionally, the wear mechanism changes from fatigue-abrasive wear to oxidation wear with increasing temperature. This study reveals the oxidation-tribological coupling behavior of Mo<sub>2</sub>VAlC<sub>2</sub> and provides insights for designing MAX phases with enhanced high-temperature self-lubricating properties.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"46 8","pages":"Article 118177"},"PeriodicalIF":6.2,"publicationDate":"2026-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146079966","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 high-temperature oxidation of Carbon/carbon (C/C) composites limits their application as hot-end structural materials in the aerospace industry. To solve this problem, a HfSiO4-based coating with strong oxygen blocking ability on the C/C composites was fabricated by a compound method of slurry brushing and in-situ oxidation sintering. The C/C composites were protected by the coating for 2257 h at 1773 K, 121 h at 1973 K in air, with a mass loss of about 0.50 wt%, respectively. Such good performance was attributed to the Hf-Si-O oxygen barrier layer with abundant and uniformly distributed HfSiO4 particles (Volume accounting for over 65 %). The HfSiO4 particles could reduce the volatile mass of the SiO2 glass, and relieve the difference of coefficient of thermal expansion (CTE) between the SiC inner coating and SiO2 in the outer coating. More importantly, the oxygen diffusion resistance of the Hf-Si-O layer with HfSiO4 as the main phase was significantly enhanced, providing a basis for optimizing the composition of oxidation resistance coatings at 1973 K and above in air.
{"title":"A HfSiO4-based coating with stronger oxidation resistance defending C/C composites at 1773 K and 1973 K in air","authors":"Xiaofei Zhu , Jian Zhang , Ruicong Chen , In-Ho Jung , Yulei Zhang","doi":"10.1016/j.jeurceramsoc.2026.118180","DOIUrl":"10.1016/j.jeurceramsoc.2026.118180","url":null,"abstract":"<div><div>The high-temperature oxidation of Carbon/carbon (C/C) composites limits their application as hot-end structural materials in the aerospace industry. To solve this problem, a HfSiO<sub>4</sub>-based coating with strong oxygen blocking ability on the C/C composites was fabricated by a compound method of slurry brushing and in-situ oxidation sintering. The C/C composites were protected by the coating for 2257 h at 1773 K, 121 h at 1973 K in air, with a mass loss of about 0.50 wt%, respectively. Such good performance was attributed to the Hf-Si-O oxygen barrier layer with abundant and uniformly distributed HfSiO<sub>4</sub> particles (Volume accounting for over 65 %). The HfSiO<sub>4</sub> particles could reduce the volatile mass of the SiO<sub>2</sub> glass, and relieve the difference of coefficient of thermal expansion (CTE) between the SiC inner coating and SiO<sub>2</sub> in the outer coating. More importantly, the oxygen diffusion resistance of the Hf-Si-O layer with HfSiO<sub>4</sub> as the main phase was significantly enhanced, providing a basis for optimizing the composition of oxidation resistance coatings at 1973 K and above in air.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"46 8","pages":"Article 118180"},"PeriodicalIF":6.2,"publicationDate":"2026-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146079965","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 : 2026-01-27DOI: 10.1016/j.jeurceramsoc.2026.118179
Zhuoqun Jiang , Sheng Huang , Qiulin Li , Le Rong , Zhanxue Wang , Yuriy Tokovyy
SiCf/SiC composite materials, with advantages such as high temperature resistance and low density, have gradually become an important means of improving the overall performance of engines. For hot components, which require active cooling, the film-hole structure not only disrupts the continuity of the fibers and the matrix, reducing the material's load-bearing capacity, but also forms a new mass transfer channel for the Chemical Vapor Infiltration (CVI) process, which can generate a reinforcement effect through re-deposition. Mechanical tests were performed on perforated 2D SiCf/SiC composites with controlled variables: deposition time, hole diameter, secondary deposition treatment after perforation. Full-field strain distribution was characterized by digital image correlation (DIC), while damage behavior was monitored via scanning electron microscopy (SEM). This approach investigated the coupled effects of deposition parameters and structural features on secondary deposition modified perforated SiCf/SiC. Longer first deposition time reduces specimen surface damage and strain levels, but simultaneously diminishes the effectiveness of secondary deposition. Hole diameter significantly influences maximum strain and strength; moreover, secondary deposition strengthening intensifies with larger hole diameters. Distinct failure modes underscore complex interactions among deposition time, hole diameter, and secondary deposition. The established process-structure-property model provides critical theoretical support for integrated design of ceramic matrix composite (CMC).
{"title":"Parametric effects on secondary deposition modification of 2D SiCf/SiC film cooling hole structures","authors":"Zhuoqun Jiang , Sheng Huang , Qiulin Li , Le Rong , Zhanxue Wang , Yuriy Tokovyy","doi":"10.1016/j.jeurceramsoc.2026.118179","DOIUrl":"10.1016/j.jeurceramsoc.2026.118179","url":null,"abstract":"<div><div>SiC<sub>f</sub>/SiC composite materials, with advantages such as high temperature resistance and low density, have gradually become an important means of improving the overall performance of engines. For hot components, which require active cooling, the film-hole structure not only disrupts the continuity of the fibers and the matrix, reducing the material's load-bearing capacity, but also forms a new mass transfer channel for the Chemical Vapor Infiltration (CVI) process, which can generate a reinforcement effect through re-deposition. Mechanical tests were performed on perforated 2D SiC<sub>f</sub>/SiC composites with controlled variables: deposition time, hole diameter, secondary deposition treatment after perforation. Full-field strain distribution was characterized by digital image correlation (DIC), while damage behavior was monitored via scanning electron microscopy (SEM). This approach investigated the coupled effects of deposition parameters and structural features on secondary deposition modified perforated SiC<sub>f</sub>/SiC. Longer first deposition time reduces specimen surface damage and strain levels, but simultaneously diminishes the effectiveness of secondary deposition. Hole diameter significantly influences maximum strain and strength; moreover, secondary deposition strengthening intensifies with larger hole diameters. Distinct failure modes underscore complex interactions among deposition time, hole diameter, and secondary deposition. The established process-structure-property model provides critical theoretical support for integrated design of ceramic matrix composite (CMC).</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"46 9","pages":"Article 118179"},"PeriodicalIF":6.2,"publicationDate":"2026-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146191582","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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