MgO对镍基碳化钨激光熔覆层组织和耐磨性的影响  

Effect of MgO on the Microstructure and Wear Resistance of Laser Clad Ni/WC Coatings

作　　者：晁明举[1] 袁斌[1] 赵栋[1] 梁二军[1] 

机构地区：[1]郑州大学物理工程学院河南省激光应用技术重点实验室,郑州450052

出　　处：《应用激光》2002年第2期127-131,126,共6页Applied Laser

基　　金：河南省高校创新人才基金;河南省杰出人才创新基金

摘　　要：采用G112+镍包碳化钨复合合金粉末在45＃钢基材表面进行激光熔覆。对比研究了添加不同含量MgO在不同激光功率条件下对激光熔覆层的宏观形貌、显微组织、硬度分布及摩擦学性能的影响。实验表明:适量MgO的加入能使镍基碳化钨金属陶瓷熔覆层中的裂纹大为减少甚至消失,熔覆层组织得到细化。在同样的摩擦条件下,掺入0.15％MgO的激光熔覆层的摩擦系数与未掺入MgO的摩擦系数相比,随时间的变化量很小。MgO添加剂具有减摩抗磨作用。Ni/WC composite alloy coatings on 45 steel has been prepared by laser cladding technology. The influence of MgO contents and laser power on the macroscopic features, microstructure, microhardness and tribological properties has been studied. It is shown that the microstructure of laser coatings is greatly refined and the cracks is obviously reduced or even vanished by addition of proper amount of MgO. The tribological properties of the coatings with MgO are much improved than that without MgO. Magnesia possesses the dual characteristics of reduce friction and wear resistance.

关 键 词：激光熔覆 裂纹 显微组织 耐磨性 氧化镁 金属陶瓷 镍基碳化钨 

分 类 号：TG148[一般工业技术—材料科学与工程] TG174.44[金属学及工艺—金属材料]