Influence of Si-O-C Interlayer on Mechanical Properties and Thermal Expansion Properties of C/SiC-N Composites
LU Guo-feng1,2, QIAO Sheng-ru2
1. College of Chemistry and Materials, Weinan Normal University, Weinan 714099, Shaanxi, China;
2. National Key Laboratory of Thermostructure Composite Materials, Northwestern Polytechnical University, Xi'an 710072, China
Abstract：The carbon fiber reinforced Si-C-N ceramic matrix composites with a Si-O-C interlayer(C/Si-O-C/Si-C-N) was fabricated with the matrix fabricated by CVI and the interphase fabricated by PIP. The influence of Si-O-C interlayer on the mechanical properties and thermal expansion properties of the composites was investigated. The results show that the flexural strength of C/Si-O-C/Si-C-N is approximately equal to that of C/PyC/Si-C-N. The role of Si-O-C interphase in C/Si-C-N can rival that of PyC interphase. The average coefficient of thermal expansion of C/Si-O-C/Si-C-N is slightly higher than that of C/PyC/Si-C-N throughout the experimental temperature range.
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2018, Vol. 46 
