采用IPG光纤激光加工系统及预置粉末法，在Cr12MoV钢表面激光熔覆了Co/MoS2/CaF2自润滑复合涂层。利用X射线衍射(XRD)、扫描电镜(SEM)和能谱仪(EDX)等研究了Co/MoS2/CaF2自润滑复合涂层微观组织及摩擦学行为。结果表明，涂层组织为致密的网状结构，局部表现出枝晶生长的特征，熔覆涂层与基体为冶金结合。熔覆涂层中存在MoS2和CaF2，部分MoS2和CaF2在激光热作用下发生了分解，分解后的S、Ca等元素与Co元素生成了CoF3和CaS等新相。常温条件下，润滑相含量为a(MoS2)＝7.5%、a(CaF2)＝7.5%的激光熔覆自润滑涂层减摩效果明显，摩擦系数为0.20～0.35。

In this paper, the Co/MoS2/CaF2metal matrix composite(MMC)self-lubricating coatings were successfully fabricated on Cr12MoV Steel by IPG fiber laser cladding using placement composite powders. Microstructure and tribological property of the Co/MoS2/CaF2self-lubricating coatings were investigated by X-ray diffraction(XRD)and scanning electron microscopy (SEM), as well as X-ray energy dispersive microanalysis(EDX). The results indicat that the microstructure of the self-lubricating coatings is network and dendritic structure local. Close to the surface of the coatings, the microstructure is fine. The coatings and substrate are bonded metallurgically. There are some MoS2, CaF2, CoF3 and CaS in the self-lubricating coatings. Under the normal temperature condition， the friction and wear experimental result shows that the coating contained 7.5% MoS2 and 7.5% CaF2 exhibited good friction-reducing behaviors.