电弧喷涂铁基非晶涂层摩擦磨损性能分析

采用电弧喷涂技术在低碳钢基体上制备Fe-（Cr,Ni）-（C,B）系非晶合金涂层。利用X射线衍射仪、扫描电子显微镜和差热分析仪对涂层的相组成、微观组织和热稳定性进行了分析,用MRH-3型高速环块磨损试验机研究涂层的干摩擦磨损行为.结果表明,涂层中含有一定量的非晶相,呈典型的热喷涂层状组织结构,孔隙率较低;涂层具有良好的热稳定性,在500℃以下使用不会发生晶化转变;涂层具有较高的显微硬度和优异的摩擦磨损性能,平均显微硬度为1 155 HV0.1,相同试验条件下,涂层的相对耐磨性能约为Q235钢的13.3倍,涂层的磨损机制主要以疲劳磨损为主.

Frictional wear of arc sprayed coatings containing ironbased amorphous phase

Amorphous Fe-(Cr,Ni)-(C,B) coatings were prepared on low carbon steel by arc spraying technology.The phase composition,microstructure,properties of thermal stability and behavior of frictional wear were studied and analyzed by X-ray diffraction instrument(XRD),scanning electronic microscope(SEM),differential thermal analyzer and MRH-3 friction wear testing machine,respectively.The results showed that the coating had a high content of amorphous phase,layered distribution and a dense and uniform structure.The crystallization process in the coating would not occur at the temperature below 500 ℃.The coating possessed high hardness and excellent friction and wear properties,with the average hardness of 1 155 HV0.1.At the same experimental conditions,the relative wear-resistance property of the coating was 13.3 times of the one of Q235 steel,the wear mechanism was mainly dominated by fatigue wear.