Tribology Performance of High Speed Arc Spraying Al-Ni-Mm-Co Coating under Lubrication Conditions of Different Greases

Abstract

Abstract: Aluminum coating and Al-Ni-Mm-Co coating were formed on the surface of 6061 aluminum alloy by arc spraying to overcome deficients of hardness and anti-wear of aluminum alloy. Micro hardness, microstructure and components of the coatings were analyzed by micro hardness tester, scanning electron microscopy and X-ray diffraction, respectively. The tribology performances of two coatings lubricated by two types of greases were investigated by a ball-on-disk tribometer. The results show that the tribology performance of Al-Ni-Mm-Co coating is better than that of the 6061 aluminum alloy and aluminum coating, and the reason is attributed to the protective oxide film which is formed by Al2O3, NiO and CoO on the wear scar. The principal wearing form of the Al-Ni-Mm-Co coating is fatigue wear.

Key words: aluminum alloy, aluminum coating, Al-Ni-Mm-Co coating, arc spraying, friction and wear

摘要： 针对铝合金硬度低、耐磨性差的问题，采用电弧喷涂分别在6061铝合金基体表面喷涂Al和Al-Ni-Mm-Co涂层，采用显微硬度计、扫描电子显微镜、X射线衍射仪分别对涂层硬度、涂层显微结构、涂层成分进行分析。采用球-盘式往复摩擦试验机考察涂层在脂润滑下的摩擦学性能，并对磨痕形貌和表面主要元素进行观察。结果表明，Al-Ni-Mm-Co涂层的减摩性和抗磨性能均优于6061铝合金和Al涂层，其优异的摩擦学性能归结为摩擦表面形成的Al2O3、NiO、CoO等氧化保护层，主要的磨损形式为疲劳磨损。

关键词: 铝合金, 铝涂层, Al-Ni-Mm-Co涂层, 电弧喷涂, 摩擦磨损

CLC Number:

TG174.442

XI Xiang, XIA Yanqiu, CAO Zhengfeng, WANG Junyao, LIANG Xiubin, QIAO Yulin. Tribology Performance of High Speed Arc Spraying Al-Ni-Mm-Co Coating under Lubrication Conditions of Different Greases[J]. China Mechanical Engineering.

席翔, 夏延秋, 曹正锋, 王骏遥, 梁秀兵, 乔玉林. 高速电弧喷涂Al-Ni-Mm-Co涂层在脂润滑下的摩擦磨损性能[J]. 中国机械工程.

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