Influence Of Si-O-C Interlayer On Mechanical Properties And Thermal Expansion Properties Of C/Sic-N Composites

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.