引用本文:刘小镇,刘小萍,孟天旭,郭麒,于盛旺,黑鸿君,王振霞.炭/炭复合材料表面氢刻蚀改善等离子体渗Cr层的抗氧化性能[J].中国表面工程,2017,30(1):41~48
LIU Xiao-zhen,LIU Xiao-ping,MENG Tian-xu,GUO Qi,YU Sheng-wang,HEI Hong-jun,WANG Zhen-xia.Oxidation Resistance of C/C Composites by Hydrogen Etching and Plasma Cr Alloying[J].China Surface Engineering,2017,30(1):41~48
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炭/炭复合材料表面氢刻蚀改善等离子体渗Cr层的抗氧化性能
刘小镇, 刘小萍, 孟天旭, 郭麒, 于盛旺, 黑鸿君, 王振霞
太原理工大学 材料科学与工程学院 表面工程研究所, 太原 030024
摘要:
用双层辉光等离子渗金属技术，在炭/炭复合材料表面制备Cr涂层，改善其抗高温氧化性能。渗Cr前先用微波等离子体对炭/炭复合材料表面进行氢刻蚀处理，提高Cr涂层与基体间的结合力。用扫描电子显微镜、能谱仪和X-射线衍射仪分别对刻蚀、渗Cr及氧化后炭/炭复合材料表面形貌、成分及组织结构进行分析。结果表明：经过900℃、1 h刻蚀后，炭/炭复合材料表面形成蜂窝状结构，经后续950℃、2 h渗Cr处理后，在刻蚀后的炭/炭复合材料表面形成厚约5 μm的Cr/CryCx复合涂层，涂层表面致密均匀，无裂纹和剥落；900℃高温循环氧化2.4 h后的失重率为2.79%，抗高温氧化能力较基材得到明显改善。
关键词:  炭/炭复合材料  等离子表面渗Cr  刻蚀  碳化铬  抗氧化
DOI：10.11933/j.issn.1007-9289.20160908005
分类号:
基金项目:国家自然科学基金（51474154，51401141，51601124）；山西省自然科学基金（2014011015-7）
Oxidation Resistance of C/C Composites by Hydrogen Etching and Plasma Cr Alloying
LIU Xiao-zhen, LIU Xiao-ping, MENG Tian-xu, GUO Qi, YU Sheng-wang, HEI Hong-jun, WANG Zhen-xia
Research Institute of Surface Engineering, School of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024
Abstract:
The Cr coating was prepared on C/C composite by double glow plasma surface technology to improve its high temperature oxidation resistance. The bonding strength between Cr coating and C/C composite substrate was enhanced by using hydrogen etching in microwave plasma prior to plasma Cr alloying. The morphologies, composition and microstructure of the composites after etching, Cr alloying and oxidation testing were analyzed by scanning electron microscope(SEM), energy spectrometer(EDS) and X-ray diffraction(XRD). The results show that honeycomb-like structure is formed on the surface of C/C composites after H-etching at 900℃ for 1 h. A uniform, compact and crack-free Cr/CryCx coating with thickness of 5 μm is formed on the surface of C/C composites after plasma chromizing at 950℃ for 2 h. The oxidation resistance of the composites is significantly improved by hydrogen etching and plasma Cr alloying. The weight loss of the Cr/CryCx coated specimen is 2.79% after cyclical oxidation at 900℃ for 2.4 h.
Key words:  C/C composites  plasma surface chromizing  etching  CryCx  oxidation resistance
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