| 摘要: |
| 采用超音速火焰喷涂技术制备了WC-(W,Cr)2C-Ni和WC-17Co两种涂层，评价了两种涂层在高低温快速交变条件下的热震性能，并使用SRV摩擦磨损试验机考察了两种涂层从室温到600 ℃时与Si3N4球配副时的摩擦磨损性能。结果表明：WC-(W,Cr)2C-Ni涂层的抗热震性能远优于WC-17Co涂层；WC-17Co涂层虽具有较低的磨损率，但是高温下涂层中产生大量裂纹及发生因严重氧化而导致的硬度下降，表明该涂层不适于作为400 ℃以上的耐磨材料；尽管WC-(W,Cr)2C-Ni涂层的磨损率比WC-17Co涂层大，但仍属于微量磨损，且其具有优异的抗高温氧化性能和抗热震性能，所以该涂层非常适于作为高温或宽温域下的耐磨材料。 |
| 关键词: 超音速火焰喷涂 WC-17Co涂层 WC-(W,Cr)2C-Ni涂层 热震性能 摩擦磨损 |
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| 基金项目:国家自然科学基金创新研究群体科学基金（50421502）； 中国科学院知识创新工程重要方向性项目（YYYJ0913） |
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| Tribological Behavior of Two Types of WC-based Coatings at 600 ℃ |
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HOU Guo-liang, AN Yu-long, CHEN Jie, CHEN Jian-min, ZHOU Hui-di, ZHAO Xiao-qin, YANG Jie1,2
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1. State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000;2. Graduate University of Chinese Academy of Sciences, Beijing 100049
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| Abstract: |
| WC-17Co and WC-(W,Cr)2C-Ni coatings were prepared by high velocity oxyfuel (HVOF) spraying. The thermal shock resistance of the coatings under rapidly alternate high and low temperatures was measured. Moreover, the friction and wear behavior of the coatings sliding against Si3N4 ball up to 600 ℃ was investigated using a SRV friction and wear tester. Results show that the thermal shock resistance of WC-(W,Cr)2C-Ni coating is far superior to that of WC-17Co coating. WC-17Co coating has lower wear rate, however, severe cracks appear in the coating and largely decrease its hardness owing to serious oxidization, which show that this coating can not be used as wear resistant material above 400 ℃. Though WC-(W,Cr)2C-Ni coating possesses larger wear rate, it still show the feature of “mild wear” over the whole temperature range. Moreover, the high temperature oxidization resistance and thermal shock resistance of WC-(W,Cr)2C-Ni coating are superior; thus it is very suitable for wear resistant material at high temperature or over a wide temperature range. |
| Key words: HVOF WC-17Co coating WC-(W,Cr)2C-Ni coating thermal shock performance friction and wear |
