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

材料科学技术（英文）, 2007, 23(4): 559-562.

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1.National Key Laboratory of Thermostructure Composite Materials, Northwestern Polytechnical University,Xi'an 710072, China

2.National Key Laboratory of Thermostructure Composite Materials, Northwestern Polytechnical University,Xi'an 710072, China

3.National Key Laboratory of Thermostructure Composite Materials, Northwestern Polytechnical University,Xi'an 710072, China

4.National Key Laboratory of Thermostructure Composite Materials, Northwestern Polytechnical University,Xi'an 710072, China

5.National Key Laboratory of Thermostructure Composite Materials, Northwestern Polytechnical University,Xi'an 710072, China

6.National Key Laboratory of Thermostructure Composite Materials, Northwestern Polytechnical University,Xi'an 710072, China

基金项目: 国家重点基础研究发展计划(973计划)(2006CB600908) 航天科技基金(03H53044)

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

Keywords： C/C composites

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

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