Investigation of the microstructure and high temperature anti-oxidation property of SiC-Mo(Si,Al)2 multi-coating for carbon/carbon composites

doi:10.19936/j.cnki.2096-8000.20210828.014

Abstract

Abstract: A SiC-Mo(Si,Al)₂ oxidation protective coating on carbon/carbon composites was prepared by high temperature in-situ reaction. Effects of the content of Al and Si on the microstructure and high temperature anti-oxidation property of the multi-coating were studied by XRD, SEM and isothermal oxidation test, and the failure reason of the coating at high temperature was analyzed. The results showed that the addition of Al enhanced the infiltration capacity of the embedded powder. When the molar ratio of Al/Si was 1∶10, the coating was composed of mainly Mo(Si,Al)₂, MoSi₂, SiC and Si, and it was thick and dense, giving good oxidation protective ability. The holes were formed in the SiO₂ glass layer during oxidation, resulting in the quick consumption of the coating materials and the formation of the penetration cracks in the coating, which was the main reason for the failure of the coating.

Key words: C/C composites, coating, anti-oxidation, failure analysis

CLC Number:

TB332

HOU Dang-she, LI Ke-zhi. Investigation of the microstructure and high temperature anti-oxidation property of SiC-Mo(Si,Al)₂ multi-coating for carbon/carbon composites[J]. COMPOSITES SCIENCE AND ENGINEERING, 2021, 0(8): 91-94.

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Investigation of the microstructure and high temperature anti-oxidation property of SiC-Mo(Si,Al)₂ multi-coating for carbon/carbon composites

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