Effect of Al2O3 on the densification and oxidation behavior of SiC coating for carbon/carbon composites
Effect of Al2O3 on the densification and oxidation behavior of SiC coating for carbon/carbon composites
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DOI：
10.1016/j.ceramint.2018.04.072
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发表时间：
2018-08
影响因子：
5.2
通讯作者：
Chun-yu Cheng;Hejun Li;Q. Fu;Liping Guo
中科院分区：
文献类型：
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作者：
Chun-yu Cheng;Hejun Li;Q. Fu;Liping Guo
A silicon carbide (SiC) coating was prepared on carbon/carbon (C/C) composites by pack cementation using Si, C and Al2O3powers as raw materials. The role of Al2O3on the densification of the SiC coating was investigated. The results show that the densification and thickness of the SiC coating obviously increase with the increase of Al2O3content, which is attributed to the enhanced material transport through liquid Al2O3at high temperature. Moreover, to study the effect of Al2O3on the oxidation behavior of SiC coating itself at 1773 K in air, the synthetic SiC powders by pack cementation were sintered. The results present that after oxidation for 40 h, only a few holes are observed in the generated glass layer of the SiC ceramic without Al2O3, while more holes appear in the surface of the oxidized Al2O3doped SiC ceramic, owning to the doped Al atom destroying the SiO2network and causing the permeability of oxygen to increase.
