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SiC/Si-W-Mo coating for protection of C/C composites at 1873 K

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Journal of University of Science and Technology Beijing 2008年第6期15卷 822-826页

作者： dangshe hou kezhi li hejun li qiangang fu yulei zhang National Key Laboratory of Thermostructure Composite Materials Northwestern Polytechnical University Xi＇an 710072 China

In order to prevent carbon/carbon composites from oxidation at 1873 K, an efficient oxidation protective SiC/Si-W-Mo coating was prepared by a two-step pack cementation technique. The microstructures and the phase composition of the as-received multi-coating were examined by scanning electron microscopy （SEM） and X-ray diffraction （XRD）. It is seen that the compact multi-coating is composed of α-SiC, Si, and （WxMO1-x）Si2. Oxidation test shows that, after oxidation at 1873 K in air for 102 h and thermal cycling between 1873 K and room temperature for 10 times, the weight loss of the SiC/Si-W-Mo coated C/C composites is only 0.26%. The invalidation of the multi-coating is attributed to the formation of penetrable cracks in the coating. 2008 University of Science and Technology Beijing. All rights reserved.

关键词： C/C composites coating microstructure oxidation protection

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

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Journal of Materials Science & Technology 2007年第4期23卷 559-562页

作者： dangshe hou kezhi li hejun li qiangang fu Jian WEI yulei zhang National Key Laboratory of Thermostructure Composite Materials Northwestern Polytechnical University Xi＇an 710072 China

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.

关键词： C/C composites Coating Microstructure Oxidation

硅钽含量对C/C复合材料SiC/TaSi_2复合涂层结构和抗氧化性能的影响

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稀有金属材料与工程 2009年第A1期38卷 252-256页

作者：侯党社李克智李贺军付前刚张雨雷李新涛西北工业大学超高温结构复合材料国防科技重点实验室陕西西安710072

采用包埋技术在C/C复合材料表面制备SiC/TaSi2抗氧化复合涂层,通过恒温氧化实验以及X射线衍射分析、扫描电镜观察,研究了包埋粉料中硅钽含量对复合涂层微观结构和高温抗氧化性能的影响。结果表明,随着硅钽比的减小,复合涂层的厚度先增... 详细信息

采用包埋技术在C/C复合材料表面制备SiC/TaSi2抗氧化复合涂层,通过恒温氧化实验以及X射线衍射分析、扫描电镜观察,研究了包埋粉料中硅钽含量对复合涂层微观结构和高温抗氧化性能的影响。结果表明,随着硅钽比的减小,复合涂层的厚度先增大后减小;硅钽比为5:1所制备的复合涂层具有相对较大的厚度和较为致密的结构,且TaSi2含量相对较高,体现出优良的抗氧化和抗热震性能,在1500℃氧化241.8h和经过18次1500℃室温急冷急热后,带有该涂层的C/C试样失重仅为1.04%。穿透性裂纹的形成是长时间氧化后涂层失效的主要原因。

关键词： C/C复合材料涂层抗氧化