高速电弧喷涂Fe-Al涂层的高温磨损特性  

High Temperature Wear Behavior of Fe-Al Coating Prepared by High Velocity Arc Spraying

作　　者：朱子新[1] 徐滨士[1] 马世宁[1] 刘维民[2] 张伟[1] 

机构地区：[1]装甲兵工程学院再制造技术国防科技重点实验室,北京100072 [2]中国科学院兰州化学物理研究所固体润滑国家重点实验室,甘肃兰州730000

出　　处：《摩擦学学报》2004年第2期106-110,共5页Tribology

基　　金：国家自然科学基金资助项目(50235030;50005024);中国科学院兰州化学物理研究所固体润滑国家重点实验室开放基金资助项目(2001).

摘　　要：采用滑动磨损试验方法考察了高速电弧喷涂Fe Al金属间化合物涂层与Si3N4陶瓷球配副在室温～650℃下的摩擦磨损特性,并探讨了涂层的高温摩擦磨损机理.结果表明,随着试验温度的升高,Fe Al涂层的摩擦系数降低,耐磨性明显提高.在高温下涂层滑动摩擦系数降低的主要原因在于磨损表面发生摩擦氧化反应,从而形成具有固体润滑作用的氧化物保护层,涂层在高温下主要呈现剥层磨损特征,涂层组分Fe3Al和FeAl金属间化合物的高温强度和硬度较高,能有效地阻碍裂纹的产生、扩展及扁平颗粒的断裂,从而使得Fe Al涂层表现出优异的高温耐磨性.Fe-Al intermetallic coating was prepared on a mild steel substrate making use of high velocity arc spraying (HVAS). The high temperature wear behavior of the resulting Fe-Al intermetallic coating against Si_3N_4 under dry sliding up to 650 ℃ was investigated on a ball-on-disc test rig. The friction and wear mechanisms of the coating were discussed, based on the morphological observation of the worn surface and cross-section on a scanning electron microscope and the elemental composition measurement thereon by means of energy dispersive spectrometry. It was found that the friction coefficient of the coating decreased and the wear resistance significantly increased with increasing testing temperature. This was attributed to the solid lubricity of the oxide protective layer formed on the worn surface by way of tribochemical reactions and to the good ability of the Fe_3Al and FeAl intermetallics to retain higher strength and hardness at elevated temperatures. Namely, the Fe_3Al and FeAl intermetallics of higher strength and hardness at elevated temperatures made it possible to effectively resist crack initiation, propagation, and fracture, which largely accounted for the excellent wear resistance of the Fe-Al coating sliding against the ceramic counterpart at elevated temperatures. Moreover, the Fe-Al intermetallic coating was dominated by delamination as it slid against the ceramic counterpart at elevated temperatures.

关 键 词：高速电弧喷涂 FE-AL金属间化合物 涂层 高温磨损性能 

分 类 号：TG174.442[金属学及工艺—金属表面处理]