TAO FENG (C/C Composites Research Center, Department of Materials, Northwestern Polytechnical University, Xi'an Shaanxi 710072, PR China) HE-JUN LI () (C/C Composites Research Center, Department of Materials, Northwestern Polytechnical University, Xi'an Shaanxi 710072, PR China) QIAN-GANG FU (C/C Composites Research Center, Department of Materials, Northwestern Polytechnical University, Xi'an Shaanxi 710072, PR China) XIAO-HONG SHI (C/C Composites Research Center, Department of Materials, Northwestern Polytechnical University, Xi'an Shaanxi 710072, PR China) KE-ZHI LI (C/C Composites Research Center, Department of Materials, Northwestern Polytechnical University, Xi'an Shaanxi 710072, PR China)
Abstract
A novel MoâSiâB double-layer coating was prepared for the carbon/carbon (C/C) composites by pack cementation in an argon atmosphere. The structures of the double-layer coatings were characterized by XRD and SEM. The as-received coating shows an excellent oxidation resistance at high and intermediate temperature. It could effectively protect C/C composites from oxidation for 30 h with a weight loss of 0.9% in air at 1873 K, and for 25 h with a weight loss of l.7% at 1173 K. The oxidation protective coating was principally due to producing eutectic glass film for decreasing oxygen diffusing through the penetrable cracks in the coating.
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Publisher Info
Article provided by World Scientific Publishing Co. Pte. Ltd. in its journal Surface Review and Letters.