Oxidation behaviors of carbon fiber reinforced multilayer SiC-Si3N4 matrix composites

Journal of Advanced Ceramics

Tong Guo¹  Xiaolin Dang²  Fang Ye²  Xiaomeng Fan²  Jimei Xue²  Yongsheng Liu²  Laifei Cheng²  Donglin Zhao² 

[1] Innovation Academy for Microsatellites of Chinese Academy of Sciences;Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University;

关键词: carbon fiber reinforced SiC matrix composites (C/SiC);    multilayer SiC-Si3N4 matrices;    elastic modulus mismatch;    coefficient of thermal expansion (CTE) mismatch;    oxidation resistance;   

DOI  :  10.1007/s40145-021-0539-1

来源: DOAJ

【 摘 要 】

Abstract Oxidation behaviors of carbon fiber reinforced SiC matrix composites (C/SiC) are one of the most noteworthy properties. For C/SiC, the oxidation behavior was controlled by matrix microcracks caused by the mismatch of coefficients of thermal expansion (CTEs) and elastic modulus between carbon fiber and SiC matrix. In order to improve the oxidation resistance, multilayer SiC-Si3N4 matrices were fabricated by chemical vapor infiltration (CVI) to alleviate the above two kinds of mismatch and change the local stress distribution. For the oxidation of C/SiC with multilayer matrices, matrix microcracks would be deflected at the transition layer between different layers of multilayer SiC-Si3N4 matrix to lengthen the oxygen diffusion channels, thereby improving the oxidation resistance of C/SiC, especially at 800 and 1000 °C. The strength retention ratio was increased from 61.9% (C/SiC-SiC/SiC) to 75.7% (C/SiC-Si3N4/SiC/SiC) and 67.8% (C/SiC-SiC/Si3N4/SiC) after oxidation at 800 °C for 10 h.

【 授权许可】

Unknown