Significant improvement of resistance to dry/water oxygen corrosion at medium and high temperatures of SiC/SiC composites upon matrix modification by Ca-Y-Al-Si-O microcrystalline glass |
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| Affiliation: | 1. Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University, Xi''an, Shaanxi 710072, China;2. Institute of China North Industry Group, No.52, Yantai 264003, China;3. School of Materials Science and Engineering, Chang''an University, Xi''an 710064, Shaanxi, China;1. School of Mechanical Engineering, Xi’an Jiaotong University, Xi’an, Shaanxi 710049, China;2. School of Textile Science and Engineering, Xi’an Polytechnic University, Xi’an, Shaanxi 710048, China;3. State Key Laboratory for Manufacturing System Engineering, Xi’an Jiaotong University, Xi’an, Shaanxi 710049, China;1. State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China;2. School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China;3. University of Chinese Academy of Sciences, Beijing 100049, China;1. Shanghai High Performance Fibers and Composites Center (Province-Ministry Joint), Center for Civil Aviation Composites, Donghua University, Shanghai 201620, PR China;2. Composite Center, AVIC Manufacturing Technology Institute, National Key Laboratory of Advanced Composites, Beijing 101300, PR China;1. National Key Laboratory of Science and Technology on High-strength Structural Materials, Central South University, Changsha 410083, PR China;2. Advanced Technology & Materials Co., Ltd., Beijing 100081, PR China;3. School of Metallurgy and Environment, Central South University, Changsha 410083, PR China;1. Department of Extreme Environmental Coatings, Korea Institute of Materials Science, Changwon, Gyeongnam 51508, Republic of Korea;2. Department of Materials Convergence and System Engineering, Changwon National University, Changwon, Gyeongnam 51140, Republic of Korea;3. Research Center of Modern Surface and Interface Engineering, Anhui University of Technology, Maanshan 243002, China;1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, Shaanxi, China;2. Shaanxi Huaqin Technology Industry Co., Ltd, Xi’an 710199, China |
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| Abstract: | Matrix modification is of great significance for the densification of CVI-SiC/SiC, as well as the improvement of self-healing and oxidation resistance. A eutectic component of Y2O3-Al2O3-SiO2 system modified with CaO (CYAS) was used in this study to modify SiC/SiC at 1400 °C. The oxidation behaviour of the composites was investigated under dry/water oxygen atmosphere at 900 °C and 1300 ℃. Compared to the relatively dense SiC/SiC, the modified SiC/SiC showed a slight increase in flexural strength and fracture toughness at room temperature, as well as a significant increase in oxidation resistance and densification. Our work provides a low-cost, simple-to-operate, short-cycle densification method for CVI-SiC/SiC composites that increases their oxidation resistance without compromising their mechanical properties at room temperature. |
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| Keywords: | Modification Ca-Y-Al-Si-O glass Dry/Water oxygen SiC/SiC composites |
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