High-temperature properties and interface evolution of silicon nitride fiber reinforced silica matrix wave-transparent composite materials |
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| Affiliation: | 1. College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou, 310014, China;2. School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China;3. College of Aerospace Engineering, Chongqing University, Chongqing, 400044, China;4. Academy of Military Sciences PLA China, Quartermaster Equipment Research Institute, Beijing, 100010, China;1. Department of Applied Chemistry, School of Science, Northwestern Polytechnical University, Xi''an, Shaanxi, 710072, PR China;2. The State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu, 610065, PR China;3. Key Laboratory for Advanced Special Materials & Fabrication Processing New Technology of the Education Ministry, Sichuan University, Chengdu, 610065, PR China |
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| Abstract: | In order to improve the high-temperature performance of wave-transparent materials especially for the high-speed aircrafts application, filament winding combined with sol-gel method was adopted to the fabrication of unidirectional silicon nitride fiber reinforced silica matrix composites. The mechanical properties and the interface evolution at high temperatures were investigated. The results show that the composite sintered in N2 maintains a flexural strength of 210MPa at up to 1200°C, while its counterpart prepared in air experiences a dramatic reduction to about 73MPa. The degradation is due to the partial oxidation of silicon nitride fibers at the fiber matrix interface. Besides, it is also notable that the bending strength of these two composites undergoes a similar growth from about 160 to 210MPa when tested under 900°C, which can be explained by the release of thermal stress on the silicon nitride fibers. |
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| Keywords: | Filament winding Sintering atmosphere High-temperature mechanical properties Interface evolution |
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