期刊
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
卷 35, 期 12, 页码 2761-2766出版社
JOURNAL MATER SCI TECHNOL
DOI: 10.1016/j.jmst.2019.05.068
关键词
Si3N4f/SiO2; Fiber content; Oxidation resistance; Mechanical property
资金
- National Natural Science Foundation of China [51702361]
- Natural Science Foundation of Hunan Province [2017JJ3353]
Wave-transparent ceramic matrix composites for the high temperature use should possess excellent oxidation resistance. In this work, Si3N4f/SiO2 composites with different fiber content were fabricated by filament winding and sol gel method. The oxidation resistance was investigated by tracking the response of flexural strength to the testing temperature. The results show that the flexural strength and toughness of the composites with fiber content of over 37% can reach high levels at around 175.0 MPa and 6.2 MPa m(1/2), respectively. After 1 h oxidation at 1100 degrees C, the flexural strength drops a lot but can still reach 114.4 MPa, which is high enough to ensure the safety of structures. However, when the oxidation temperature rises to 1200-1400 degrees C, the flexural strengths continue to fall to a relatively low level at 50.0-66.4 MPa. The degradation at high temperatures is caused by the combination of over strong interfacial bonding, the damage of fiber and the crystallization of silica matrix. (C) 2019 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
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