Effect of SiC Coating on High-Temperature Service Performance of SiCf/SiC Composite Prepared via Melt Infiltration Process
LIU Hu1, QI Zhe1, AI Yingjun1, ZHOU Yiran1, YANG Jinhua1, ZHAO Wenqing1, ZHAO Chunling2, LANG Xudong2, HE Yihong2, JIAO Jian1,*
1 National Key Laboratory of Advanced Composites, AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China 2 AECC Hunan Aviation Powerplant Research Institute, Zhuzhou 412002,Hunan, China
Abstract: SiC coating was prepared by chemical vapor deposition (CVD) on the surface of SiCf/SiC composite manufactured by melt-infiltration. The effect of SiC coating on the high-temperature service performance of the SiCf/SiC composite was studied. The bending test results show that the average bending strength at ambient temperature for samples with and without SiC coating were 631 MPa and 424 MPa after oxidation at 1 200 ℃ in air for 100 h, which were reduced by 6.9% and 36.2%, respectively. The test specimen without SiC coating undergoes brittle fracture with very few fibers pulled out. The severer degradation of their flexural strength could be ascribed to the oxidation of SiC fibers and degradation of BN interphase, as analyzed by SEM and XRD. As for the samples with SiC coating, silicon dioxide film was formed on the outer surface of the coating after thermal exposure and its growth follows the parabolic rate law. The samples were subjected to comparatively slighter oxidation and displayed better flexural strength due to the protection from the SiC coating, and also significant pull-out of fibers could still be observed on the fracture surface.
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2022, Vol. 36 
