Pub Date : 2024-10-22DOI: 10.1016/j.jeurceramsoc.2024.117016
Audrey Tixier , Cyrille Varona , Jean-Michel Brossard , Patrick Ganster , François Valdivieso , Jacques Poirier , Emmanuel de Bilbao
Refractory tiles used in waste-to-energy facilities are exposed to high temperatures (Tflue-gas ≈ 1200 °C) and corrosive environment with gases and fly ashes. Post-mortem examination of refractory tiles from the combustion zone of waste-to-energy plants was conducted to understand the damage mechanism of the refractory material. Corroded refractory tiles from this area showed an important loss of matter and large cavities on the hot surface. Investigations highlighted the weakness of the refractory matrix of the material. In contact with slag deposit and corrosive gases, the bonding phase of the refractory material is dissolved and SiC grains are oxidized which causes the spalling of the hot face of refractory tiles.
{"title":"Wear mechanism of oxide-bonded SiC refractory tiles in the combustion zone of waste-to-energy facilities","authors":"Audrey Tixier , Cyrille Varona , Jean-Michel Brossard , Patrick Ganster , François Valdivieso , Jacques Poirier , Emmanuel de Bilbao","doi":"10.1016/j.jeurceramsoc.2024.117016","DOIUrl":"10.1016/j.jeurceramsoc.2024.117016","url":null,"abstract":"<div><div>Refractory tiles used in waste-to-energy facilities are exposed to high temperatures (T<sub>flue-gas</sub> ≈ 1200 °C) and corrosive environment with gases and fly ashes. Post-mortem examination of refractory tiles from the combustion zone of waste-to-energy plants was conducted to understand the damage mechanism of the refractory material. Corroded refractory tiles from this area showed an important loss of matter and large cavities on the hot surface. Investigations highlighted the weakness of the refractory matrix of the material. In contact with slag deposit and corrosive gases, the bonding phase of the refractory material is dissolved and SiC grains are oxidized which causes the spalling of the hot face of refractory tiles.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 3","pages":"Article 117016"},"PeriodicalIF":5.8,"publicationDate":"2024-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142527608","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-22DOI: 10.1016/j.jeurceramsoc.2024.116998
Xiaochen Wu , Lu Li , Hao Xu , Ruixiao Zheng , Zhijian Li , Zhaoliang Guo , Yuan Xiao , Chaoli Ma
Matrix modification is an effective method to improve the mechanical properties of ceramic matrix composites, while the elucidation of corresponding damage mechanism is essential for the design and engineering application of composites. In this work, Ti3SiC2 particles were introduced into SiC matrix to fabricate Ti3SiC2 modified SiCf/SiC (SiCf/SiC-Ti3SiC2) composites by a hybrid technique of slurry suspension impregnation combined with polymer infiltration and pyrolysis. Compared with SiCf/SiC composites, the flexural strength and modulus of SiCf/SiC-Ti3SiC2 composites were increased by 17.8 % and 61.0 %, respectively. The three-point flexural damage behavior and failure mechanism of composites were systematically investigated and compared by the combination of digital image correlation and acoustic emission techniques. Based on the collaborative analysis of in-situ damage process, matrix micro-zone toughness and fracture morphology, the modification effect and toughening mechanism of Ti3SiC2 were revealed. The improved mechanical properties of SiCf/SiC-Ti3SiC2 composite could be ascribed to the more sufficient matrix cracking before composite failure and the increased matrix fracture energy by microcrack deflection. After matrix modification, the failure mechanism was dominated by the gradual propagation and growth of microcracks until the critical crack size, instead of the fast and unstable propagation of main crack.
{"title":"Damage behavior and toughening mechanism of SiCf/SiC-Ti3SiC2 composites: A combination of digital image correlation and acoustic emission","authors":"Xiaochen Wu , Lu Li , Hao Xu , Ruixiao Zheng , Zhijian Li , Zhaoliang Guo , Yuan Xiao , Chaoli Ma","doi":"10.1016/j.jeurceramsoc.2024.116998","DOIUrl":"10.1016/j.jeurceramsoc.2024.116998","url":null,"abstract":"<div><div>Matrix modification is an effective method to improve the mechanical properties of ceramic matrix composites, while the elucidation of corresponding damage mechanism is essential for the design and engineering application of composites. In this work, Ti<sub>3</sub>SiC<sub>2</sub> particles were introduced into SiC matrix to fabricate Ti<sub>3</sub>SiC<sub>2</sub> modified SiC<sub>f</sub>/SiC (SiC<sub>f</sub>/SiC-Ti<sub>3</sub>SiC<sub>2</sub>) composites by a hybrid technique of slurry suspension impregnation combined with polymer infiltration and pyrolysis. Compared with SiC<sub>f</sub>/SiC composites, the flexural strength and modulus of SiC<sub>f</sub>/SiC-Ti<sub>3</sub>SiC<sub>2</sub> composites were increased by 17.8 % and 61.0 %, respectively. The three-point flexural damage behavior and failure mechanism of composites were systematically investigated and compared by the combination of digital image correlation and acoustic emission techniques. Based on the collaborative analysis of <em>in-situ</em> damage process, matrix micro-zone toughness and fracture morphology, the modification effect and toughening mechanism of Ti<sub>3</sub>SiC<sub>2</sub> were revealed. The improved mechanical properties of SiC<sub>f</sub>/SiC-Ti<sub>3</sub>SiC<sub>2</sub> composite could be ascribed to the more sufficient matrix cracking before composite failure and the increased matrix fracture energy by microcrack deflection. After matrix modification, the failure mechanism was dominated by the gradual propagation and growth of microcracks until the critical crack size, instead of the fast and unstable propagation of main crack.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 3","pages":"Article 116998"},"PeriodicalIF":5.8,"publicationDate":"2024-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142527604","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 : 2024-10-21DOI: 10.1016/j.jeurceramsoc.2024.117013
Xiaokai Liu , Wenyu Zhang , Benshuang Sun , Huiyu Zhang , Hongjun Yuan , Hetao Zhao , Yongge Zhao , Xina Liang , Yuanpei Yang , Jianhang Zhang , Yongchun Shu , Yang Liu , Jilin He
This study proposes a three-phase model (primary, secondary, and pore phases) utilizing the phase-field method to simulate sintering densification in AZO targets. The impact of secondary phase content and dimensions on the densification of AZO targets was investigated. The findings indicated that the density of the AZO target exhibited an initial increase followed by a subsequent decline with the augmentation of the secondary phase content and size. Conversely, the grain size demonstrated a continuous reduction. The Brook kinetic equation yields activation energies for grain growth of 607.40 kJ/mol, 999.32 kJ/mol, and 1093.20 kJ/mol for 1 wt%, 2 wt%, and 3 wt% Al2O3, respectively. Furthermore, the viability of the model was corroborated through experimentation. Based on the simulation outcomes, AZO targets doped with 2 wt% Al₂O₃ achieved 99.78 % densification, an average grain size of 3.92 μm, and a resistivity of 1.38 mΩ·cm.
{"title":"Investigating the influence mechanism of aluminum doping amount on the density and grain size of AZO target through phase-field simulation","authors":"Xiaokai Liu , Wenyu Zhang , Benshuang Sun , Huiyu Zhang , Hongjun Yuan , Hetao Zhao , Yongge Zhao , Xina Liang , Yuanpei Yang , Jianhang Zhang , Yongchun Shu , Yang Liu , Jilin He","doi":"10.1016/j.jeurceramsoc.2024.117013","DOIUrl":"10.1016/j.jeurceramsoc.2024.117013","url":null,"abstract":"<div><div>This study proposes a three-phase model (primary, secondary, and pore phases) utilizing the phase-field method to simulate sintering densification in AZO targets. The impact of secondary phase content and dimensions on the densification of AZO targets was investigated. The findings indicated that the density of the AZO target exhibited an initial increase followed by a subsequent decline with the augmentation of the secondary phase content and size. Conversely, the grain size demonstrated a continuous reduction. The Brook kinetic equation yields activation energies for grain growth of 607.40 kJ/mol, 999.32 kJ/mol, and 1093.20 kJ/mol for 1 wt%, 2 wt%, and 3 wt% Al<sub>2</sub>O<sub>3</sub>, respectively. Furthermore, the viability of the model was corroborated through experimentation. Based on the simulation outcomes, AZO targets doped with 2 wt% Al₂O₃ achieved 99.78 % densification, an average grain size of 3.92 μm, and a resistivity of 1.38 mΩ·cm.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 3","pages":"Article 117013"},"PeriodicalIF":5.8,"publicationDate":"2024-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142527611","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}
Alumina – 7.5 wt% yttria-stabilized zirconia (YSZ) ceramic composites were sintered using 24 GHz microwave heating at rates of 10 – 200 °C/min with zero isothermal hold. The starting powders were nanophase η-Al2O3 and YSZ prepared by a laser evaporation method. The final densities of the sintered samples were up to 97.5 % of the theoretical value. The samples exhibited rapid densification until transformation to the α-Al2O3 phase. The temperature of the densification rate peak (and hence of the phase transformation) decreased consistently with increasing microwave electromagnetic field intensity (varied by using different susceptor materials). The densification peak temperature difference between microwave and conventional sintering experiments exceeded 200 °C.
{"title":"Enhanced densification and phase transformations during rapid microwave sintering of alumina – yttria-stabilized zirconia ceramics","authors":"S.V. Egorov , A.G. Eremeev , V.V. Kholoptsev , K.I. Rybakov , A.A. Sorokin , S.S. Balabanov , E.Ye. Rostokina","doi":"10.1016/j.jeurceramsoc.2024.117006","DOIUrl":"10.1016/j.jeurceramsoc.2024.117006","url":null,"abstract":"<div><div>Alumina – 7.5 wt% yttria-stabilized zirconia (YSZ) ceramic composites were sintered using 24 GHz microwave heating at rates of 10 – 200 °C/min with zero isothermal hold. The starting powders were nanophase η-Al<sub>2</sub>O<sub>3</sub> and YSZ prepared by a laser evaporation method. The final densities of the sintered samples were up to 97.5 % of the theoretical value. The samples exhibited rapid densification until transformation to the α-Al<sub>2</sub>O<sub>3</sub> phase. The temperature of the densification rate peak (and hence of the phase transformation) decreased consistently with increasing microwave electromagnetic field intensity (varied by using different susceptor materials). The densification peak temperature difference between microwave and conventional sintering experiments exceeded 200 °C.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 3","pages":"Article 117006"},"PeriodicalIF":5.8,"publicationDate":"2024-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142554019","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}
In this study, the impact of sintering aid content and sintering time on the density, phase composition, microstructure, thermal conductivity, and mechanical properties of silicon nitride (Si3N4) ceramics through vat photopolymerization (VPP) was systematically investigated. The results revealed that an increase in sintering aid amount promoted the network distribution of the grain boundary phase along with densification, grain coarsening and microstructure uniformity. The extension of sintering time improved density, thermal conductivity, and mechanical properties of the material. Superior performance with relative density of 99.4 %, thermal conductivity of 64.4 W·m−1·K−1, flexural strength of 879 ± 37 MPa, and hardness of 15.0 ± 0.4 GPa was achieved in sample containing 8 wt% MgO/Y2O3 sintered for 12 h. Finally, high-precision Si3N4 ceramic heat sink elements were successfully fabricated via VPP, opening up new prospects in thermal management applications associated with electronics and automotive industries.
{"title":"Vat photopolymerization of complex-shaped silicon nitride ceramics with high mechanical and thermal performance by optimization sintering aids and kinetics","authors":"Yehua Li , Haidong Wu , Xuanzhi Chen , Pengjin Huang , Zhaoquan Huang , Shanghua Wu","doi":"10.1016/j.jeurceramsoc.2024.117014","DOIUrl":"10.1016/j.jeurceramsoc.2024.117014","url":null,"abstract":"<div><div>In this study, the impact of sintering aid content and sintering time on the density, phase composition, microstructure, thermal conductivity, and mechanical properties of silicon nitride (Si<sub>3</sub>N<sub>4</sub>) ceramics through vat photopolymerization (VPP) was systematically investigated. The results revealed that an increase in sintering aid amount promoted the network distribution of the grain boundary phase along with densification, grain coarsening and microstructure uniformity. The extension of sintering time improved density, thermal conductivity, and mechanical properties of the material. Superior performance with relative density of 99.4 %, thermal conductivity of 64.4 W·m<sup>−1</sup>·K<sup>−1</sup>, flexural strength of 879 ± 37 MPa, and hardness of 15.0 ± 0.4 GPa was achieved in sample containing 8 wt% MgO/Y<sub>2</sub>O<sub>3</sub> sintered for 12 h. Finally, high-precision Si<sub>3</sub>N<sub>4</sub> ceramic heat sink elements were successfully fabricated via VPP, opening up new prospects in thermal management applications associated with electronics and automotive industries.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 3","pages":"Article 117014"},"PeriodicalIF":5.8,"publicationDate":"2024-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142554018","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 : 2024-10-21DOI: 10.1016/j.jeurceramsoc.2024.117002
Fan Yang , Yuan Gao , Yuqiu Wang , Jimei Xue , Benzheng Gao , Zeyou Tong , Shangwu Fan , Xiaomeng Fan
In this work, BN interphase and Si3N4 matrix were prepared by chemical vapor infiltration (CVI) to optimize the mechanical properties of N610/SiOC composites, and the strengthening and toughening mechanisms were investigated. The results showed that the content and distribution of Si3N4 matrix and the thickness of BN interphase could tailor the strength and toughness of composites simultaneously. The optimal tensile strength of 234 MPa and flexural strength of 338 MPa were obtained by Si3N4 reinforced N610/SiOC composites with a BN interphase thickness of 540 nm, respectively. Meanwhile, free carbon modified BN interphase (BN(C)) and multi-layer “mortise and tenon” joint were designed to optimize the broadband EMW absorption. The impedance-matching “mortise and tenon” joint achieved a wide effective absorption bandwidth (EAB) of 8.4 GHz and a minimum reflection loss (RLmin) of −52.55 dB. This work inspires designing and fabricating CMC with both good mechanical and broadband EMW absorption properties.
{"title":"Mechanical and broadband absorption properties of Nextel 610/SiOC composites synergistically enhanced by the interfacial structure design","authors":"Fan Yang , Yuan Gao , Yuqiu Wang , Jimei Xue , Benzheng Gao , Zeyou Tong , Shangwu Fan , Xiaomeng Fan","doi":"10.1016/j.jeurceramsoc.2024.117002","DOIUrl":"10.1016/j.jeurceramsoc.2024.117002","url":null,"abstract":"<div><div>In this work, BN interphase and Si<sub>3</sub>N<sub>4</sub> matrix were prepared by chemical vapor infiltration (CVI) to optimize the mechanical properties of N610/SiOC composites, and the strengthening and toughening mechanisms were investigated. The results showed that the content and distribution of Si<sub>3</sub>N<sub>4</sub> matrix and the thickness of BN interphase could tailor the strength and toughness of composites simultaneously. The optimal tensile strength of 234 MPa and flexural strength of 338 MPa were obtained by Si<sub>3</sub>N<sub>4</sub> reinforced N610/SiOC composites with a BN interphase thickness of 540 nm, respectively. Meanwhile, free carbon modified BN interphase (BN(C)) and multi-layer “mortise and tenon” joint were designed to optimize the broadband EMW absorption. The impedance-matching “mortise and tenon” joint achieved a wide effective absorption bandwidth (EAB) of 8.4 GHz and a minimum reflection loss (RL<sub>min</sub>) of −52.55 dB. This work inspires designing and fabricating CMC with both good mechanical and broadband EMW absorption properties.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 3","pages":"Article 117002"},"PeriodicalIF":5.8,"publicationDate":"2024-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142527603","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 : 2024-10-20DOI: 10.1016/j.jeurceramsoc.2024.117001
Stefan Flauder, Nico Langhof, Stefan Schafföner
The determination of tensile properties of ceramic matrix composites (CMCs) is crucial for material development and assessment. Despite the damage tolerance of CMCs, the efforts required for proper tensile testing are similar high than for ceramics. This study describes a method to determine the sample alignment prior every single tensile testing and discusses the required amount of alignment for valid testing. For this purpose, carbon fiber-reinforced silicon carbon (C/C-SiC) samples were evaluated by only two alignment criteria. Approximately 80 % of the tensile samples failed valid with a percentage bending less than 6 % and no valid testing was achieved at a percentage bending higher than 12.3 %. Invalid testing showed an increase of strength scattering of more than 50 %, but only a minor change of the strength. The preliminary alignment check and subsequent realignment was able to increase the rate of validly tested samples by about four times.
{"title":"The role of alignment for valid tensile testing of ceramic matrix composites","authors":"Stefan Flauder, Nico Langhof, Stefan Schafföner","doi":"10.1016/j.jeurceramsoc.2024.117001","DOIUrl":"10.1016/j.jeurceramsoc.2024.117001","url":null,"abstract":"<div><div>The determination of tensile properties of ceramic matrix composites (CMCs) is crucial for material development and assessment. Despite the damage tolerance of CMCs, the efforts required for proper tensile testing are similar high than for ceramics. This study describes a method to determine the sample alignment prior every single tensile testing and discusses the required amount of alignment for valid testing. For this purpose, carbon fiber-reinforced silicon carbon (C/C-SiC) samples were evaluated by only two alignment criteria. Approximately 80 % of the tensile samples failed valid with a percentage bending less than 6 % and no valid testing was achieved at a percentage bending higher than 12.3 %. Invalid testing showed an increase of strength scattering of more than 50 %, but only a minor change of the strength. The preliminary alignment check and subsequent realignment was able to increase the rate of validly tested samples by about four times.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 3","pages":"Article 117001"},"PeriodicalIF":5.8,"publicationDate":"2024-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142527595","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-20DOI: 10.1016/j.jeurceramsoc.2024.117004
Guangda Guo, Fang Ye, Laifei Cheng, Wanshun Lei
The effect of heat treatment on the microstructure and performance of Cansas 3303 SiC fiber bundles and SiC/SiC composites with BN interphase, prepared by CVI or RMI, are investigated. Additionally, the tensile properties and fracture behavior at different temperature of CVI or RMI SiC/SiC composite are examined. Unconstrained SiC fiber bundles stable below 1350°C, halving at 1450°C and further decreasing with temperature rises. In the composites, however, the interphase and matrix exert compressive stress on fibers, mitigating their performance decline. The microstructure of interphase is mainly affected by heat treatment temperature. Tensile strength of both composites decreases with temperature. Both composites maintain structural stability with minimal changes in flexural properties below heat treatment at 1200°C. The flexural strength decreases with further rising heat treatment temperature and time. The mechanisms of properties degradation in both composites are discussed and a method for studying the thermal stability of SiC/SiC composites is established.
{"title":"Thermal stability of CVI and RMI SiC/SiC composites adopting Cansas 3303 SiC fibers","authors":"Guangda Guo, Fang Ye, Laifei Cheng, Wanshun Lei","doi":"10.1016/j.jeurceramsoc.2024.117004","DOIUrl":"10.1016/j.jeurceramsoc.2024.117004","url":null,"abstract":"<div><div>The effect of heat treatment on the microstructure and performance of Cansas 3303 SiC fiber bundles and SiC/SiC composites with BN interphase, prepared by CVI or RMI, are investigated. Additionally, the tensile properties and fracture behavior at different temperature of CVI or RMI SiC/SiC composite are examined. Unconstrained SiC fiber bundles stable below 1350°C, halving at 1450°C and further decreasing with temperature rises. In the composites, however, the interphase and matrix exert compressive stress on fibers, mitigating their performance decline. The microstructure of interphase is mainly affected by heat treatment temperature. Tensile strength of both composites decreases with temperature. Both composites maintain structural stability with minimal changes in flexural properties below heat treatment at 1200°C. The flexural strength decreases with further rising heat treatment temperature and time. The mechanisms of properties degradation in both composites are discussed and a method for studying the thermal stability of SiC/SiC composites is established.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 3","pages":"Article 117004"},"PeriodicalIF":5.8,"publicationDate":"2024-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142527708","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 : 2024-10-20DOI: 10.1016/j.jeurceramsoc.2024.117003
Chengmou Deng , Huiyong Yang , Juntong Huang , Ruiying Luo , Lianyi Wang , Zhi Chen , Wei Li , Jintao Qiu , Wenpeng Li
SiC fiber bundles with 1–4 HfSiO4 sub-layers as the interface coating were successfully obtained with detailed optimized preparation parameters via the non-hydrolyzed sol-gel (NHSG) and dip-coating method. Subsequently, SiCf/SiC minicomposites reinforced with HfSiO4-coated fibers were fabricated through a precursor infiltration pyrolysis (PIP) process. The tensile behavior and microstructures of the prepared SiCf/SiC minicomposites treated at room temperature, 800 ℃, and 1000 ℃ in an air atmosphere were investigated. The toughening mechanism of the HfSiO4 interphase in the SiCf/SiC minicomposites and the corresponding anti-oxidant properties were also thoroughly discussed. Results indicate that SiCf/SiC minicomposites with the HfSiO4 interphase possessed a nearly pseudo-plastic fracture characteristic and significantly enhanced anti-oxidant properties. It is inspired that the properties of the SiCf/SiC minicomposites could be adjusted by controlling the thickness of the HfSiO4 interphase to acquire desirable properties such as a higher tensile strength or better oxidation resistance.
{"title":"Preparation and mechanical performance of SiCf/SiC minicomposites with HfSiO4 interphase","authors":"Chengmou Deng , Huiyong Yang , Juntong Huang , Ruiying Luo , Lianyi Wang , Zhi Chen , Wei Li , Jintao Qiu , Wenpeng Li","doi":"10.1016/j.jeurceramsoc.2024.117003","DOIUrl":"10.1016/j.jeurceramsoc.2024.117003","url":null,"abstract":"<div><div>SiC fiber bundles with 1–4 HfSiO<sub>4</sub> sub-layers as the interface coating were successfully obtained with detailed optimized preparation parameters via the non-hydrolyzed sol-gel (<strong>NHSG)</strong> and dip-coating method. Subsequently, SiC<sub>f</sub>/SiC minicomposites reinforced with HfSiO<sub>4</sub>-coated fibers were fabricated through a precursor infiltration pyrolysis (<strong>PIP</strong>) process. The tensile behavior and microstructures of the prepared SiC<sub>f</sub>/SiC minicomposites treated at room temperature, 800 ℃, and 1000 ℃ in an air atmosphere were investigated. The toughening mechanism of the HfSiO<sub>4</sub> interphase in the SiC<sub>f</sub>/SiC minicomposites and the corresponding anti-oxidant properties were also thoroughly discussed. Results indicate that SiC<sub>f</sub>/SiC minicomposites with the HfSiO<sub>4</sub> interphase possessed a nearly pseudo-plastic fracture characteristic and significantly enhanced anti-oxidant properties. It is inspired that the properties of the SiC<sub>f</sub>/SiC minicomposites could be adjusted by controlling the thickness of the HfSiO<sub>4</sub> interphase to acquire desirable properties such as a higher tensile strength or better oxidation resistance.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 3","pages":"Article 117003"},"PeriodicalIF":5.8,"publicationDate":"2024-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142527594","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 : 2024-10-20DOI: 10.1016/j.jeurceramsoc.2024.117005
Xunxun Hu , Yongguo Chen , Hongbo Guo , Huibin Xu
Aero-engine service environments are complex and variable, environmental barrier coatings are usually exposed to the coupled corrosion of CMAS and molten salt. Clarifying the relevant corrosion mechanisms is of guiding significance for the protection of environmental barrier coatings. In this study, the CMAS+NaVO3 (CN) corrosion behavior of a typical Yb2Si2O7/Si coating prepared by atmospheric plasma spray (APS) technique was explored. Results showed that CN was completely melted and uniformly spread at 1200℃, a temperature lower than the melting point of CMAS. Interaction between the Yb2Si2O7/Si coating and CN produced a discontinuous non-stoichiometric garnet phase at 1200℃. At 1300 °C, the reaction produced an apatite reaction layer, but when the duration was extended to 50 h, the apatite layer was gradually dissolved. Moreover, the CN melt infiltrated into the entire Yb2Si2O7 coating, causing buckling of the Yb2Si2O7 layer and debonding with the Si layer, ultimately leading to failure of the Yb2Si2O7/Si coating.
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