Microstructure and mechanical properties of SiCf/SiBCN ceramic matrix composites
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- 作者：Jiaying Wang ; Zhihua Yang ; Xiaoming Duan ; Dechang Jia…
- 关键词：hot pressing ; composites ; mechanical properties ; fiber
- 刊名：Journal of Advanced Ceramics
- 出版年：2015
- 出版时间：March 2015
- 年：2015
- 卷：4
- 期：1
- 页码：31-38
- 全文大小：3,789 KB
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- 出版者：Springer Berlin Heidelberg
- ISSN：2227-8508
文摘
SiC fiber reinforced SiBCN ceramic matrix composites (CMCs) have been prepared by mechanical alloying and consolidated by hot pressing. During the sintering process, amorphous SiC fibers crystallized seriously and transformed into β-SiC. Meanwhile, the interfacial carbothermal reactions caused the strong bonding between the matrix and fibers. As a result, SiCf/SiBCN fractured in a typical catastrophic manner. Room-temperature mechanical properties reached the maximums for the CMC samples sintered at 1900 °C/60 MPa/30 min. The density, flexural strength, Young’s modulus and fracture toughness are 2.56±0.02 g/cm3, 284.3±17.9 MPa, 183.5±11.1 GPa and 2.78±0.14 MPa·m1/2, respectively.