CeO2对NiCrBSi—WC合金激光熔敷层组织和摩擦磨损行为的影响

采用ＮｉＣｒＢＳｉ－ＷＣ复合合金粉末在４０Ｃｒ基材表面进行激光熔敷。对比研究了添加稀土ＣｅＯ２对激光熔敷层的显微组织、相结构、硬度分布及摩擦学性能的影响。结果表明，ＣｅＯ２可改善激光熔敷层的组织致密性和均匀性，不同载荷下，添加少量ＣｅＯ２的激光熔敷层的滑动摩擦系数比未加ＣｅＯ２的平均降低了约１４％，耐磨性提高了２５％～６６％。稀土氧化物添加剂具有减摩抗磨双重作用

Effect of Rare Earth CeO2 on the Microstructure and Tribological Properties of Laser Remelted NiCrBSiWC Alloy Coating

The laser surface remelting technique was used to produce NiCrBSiWC composite alloy coating on 40Cr steel substrate.The microstructures,microhardness distribution and the tribological behaviors of the laser remelted coating with CeO2 and without CeO2 were respectively investigated by means of SEM,XRD,EDAX and dry wear test.The experimental resultes have shown that microstructure of laser remelted alloy coating is greatly refined and uniformized by addition of CeO2.Under different normal loads,the friction coefficient of laser remelted coating was decreased by 14% and wear resistance was increased by 25% to 66% due to the minor addition of CeO2.The rare earth oxide possesses the dual characteristics of reduced friction and wear resistance.