SiC Coating Prepared by a Two-step Technique of Pack Cementation and CVD on Carbon/Carbon Composites

doi:10.3724/SP.J.1077.2007.00737

Abstract

Abstract: A SiC coating was prepared on carbon/carbon (C/C) composites by a two-step technique of pack cementation and CVD processes to prevent these composites from oxidation. SEM, EDS and XRD were applied to analyze the surface and cross-section morphologies, element distribution and phase composition of the coating, respectively. The results show that a transitional layer with gradient distribution of Si and C content is formed between the SiC coating obtained by pack cementation process and C/C substrate, and the compact coating prepared by CVD process effectively fills the pores of the coating by pack cementation. The coating made by the two-step technique exhibits excellent oxidation protective ability. The weight loss percentage of the coated C/C composites is only 2.01% after oxidation in air at 1500℃ for 60h. The weight loss of C/C composites is primarily due to the reaction of C/C and oxygen diffusing through the microcracks in the coating during the thermal cycle between 1500℃ and room temperature.

Key words: carbon/carbon composites, chemical vapor deposition, coating

CLC Number:

TB332

WANG Biao,LI Ke-Zhi,LI He-Jun,FU Qian-Gang,WANG Xiang,LAN Feng-Tao. SiC Coating Prepared by a Two-step Technique of Pack Cementation and CVD on Carbon/Carbon Composites[J]. Journal of Inorganic Materials, DOI: 10.3724/SP.J.1077.2007.00737.

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SiC Coating Prepared by a Two-step Technique of Pack Cementation and CVD on Carbon/Carbon Composites

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