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5328 |
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Effect of surface roughness on the oxidation resistance of SiC coatings on C/SiC composites |
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Fang Jia* / Beijing General Research Institute of Mining and Metallurgy, P.R. China Xiaojuan Ji/ Beijing General Research Institute of Mining & Metallurgy, China Haoran Peng/ Beijing General Research Institute of Mining & Metallurgy, China Jie Shen/ Beijing General Research Institute of Mining & Metallurgy, China Deming Zhang/ Beijing General Research Institute of Mining & Metallurgy, China Yueguang Yu/ Beijing General Research Institute of Mining & Metallurgy, China |
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SiC coatings with different surface roughness were prepared on C/SiC composites in a vacuum atmosphere by pack cementation technique to protect the substrate from oxidation. The phase and microstructure of the coatings were investigated by XRD, SEM and EDS analyses. The relationship between powder particle size in the pack and surface roughness of SiC coatings was studied. Cyclic oxidation test at 1300 °C in air atmosphere was performed and the effect of surface roughness on high-temperature oxidation resistance of coatings was discussed in detail. It is observed that with powder particle size in the pack increasing surface roughness of SiC coatings increases, oxidation resistance first improves and then deteriorates. Possible mechanisms related to oxidation were preliminarily discussed. |