2009•Journal of Material Science and TechnologyRequires access

W-Mo-Si/SiC Oxidation Protective Coating for Carbon/Carbon Composites

Dang-She Hou, Kezhi Li, Hejun Li, Qiangang Fu, Wei Jian, Yulei Zhang

Abstract

A W-Mo-Si/SiC double-layer oxidation protective coating for carbon/carbon (C/C) composites was prepared by a two-step pack cementation technique. XRD (X-ray diffraction) and SEM (scanning electron microscopy) results show that the coating obtained by the first step pack cementation was a thin inner buffer layer of SiC with some cracks and pores, and a new phase of (WxMo1−x)Si2 appeared after the second step pack cementation. Oxidation test shows that, after oxidation in air at 1773 K for 175 h and thermal cycling between 1773 K and room temperature for 18 times, the weight loss of the W-Mo-Si/SiC coated C/C composites was only 2.06%. The oxidation protective failure of the W-Mo-Si/SiC coating was attributed to the formation of some penetrable cracks in the coating.

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Key concepts: Cementation (geology), Materials science, Reinforced carbon–carbon, Scanning electron microscope, Coating, Composite material, Temperature cycling, Carbon fibers