期刊
CORROSION SCIENCE
卷 68, 期 -, 页码 168-175出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2012.11.009
关键词
Ceramic matrix composites; SEM; Oxidation
资金
- National Natural Science Foundation of China [90816020, 90916019, 91116015]
- Aid program for Science and Technology Innovative Research Team in Higher Educational Institutions of Hunan Province
Ablation behavior of 3D C/ZrC-SiC composite was tested under an oxyacetylene flame and an ablation mechanism was proposed. A five-layer microstructure formed after ablation, including the ZrO2-melting layer, the porous layer, the SiO2-rich layer, the SiC-depleted layer and the composite substrate. The ablation rate is controlled by oxidations of carbon fibers, SiC and ZrC in the first stage, and then controlled by the scouring away of ZrO2-SiO2 binary melt by gas flow and the oxygen diffusion through the glassy ZrO2-SiO2 layer. Finally the evaporation of SiO2 controls the ablation rate cooperative with the last mentioned two ablation behavior. (C) 2012 Published by Elsevier Ltd.
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