镍基碳化钨喷焊涂层组织与磨损性能研究  

Microstructure and Wear Performance of WC Reinforced Ni-based Spraying-Welding Coating

作　　者：王群[1] 陈振华[1] 丁彰雄[2] 吴落义[1] 

机构地区：[1]湖南大学材料科学与工程学院,湖南长沙410082 [2]武汉理工大学能源与动力工程学院,湖北武汉430063

出　　处：《湖南大学学报（自然科学版）》2009年第4期57-60,共4页Journal of Hunan University:Natural Sciences

基　　金：国家自然科学基金资助项目(50479016)

摘　　要：采用带有能谱仪的扫描电镜、X射线衍射和透射电镜技术分析了氧乙炔火焰喷焊WC增强镍基自熔性合金复合涂层的组织结构,并采用湿砂橡胶轮式磨粒磨损实验机对该涂层、镀铬层以及Q235钢进行了抗磨粒磨损性能测试.结果表明,复合喷焊层的结构为在γ-Ni固溶体基体上较均匀的分布着颗粒较粗的WC粒子和弥散分布着大量细小的碳(硼)化物硬质相,这些细小的硬质相主要是Cr7C3,Cr23C6和Ni3B等.在相同的实验条件下,镀铬层和Q235钢的磨损失重分别为喷焊层的1.86倍和29.8倍.Microstructure of Tungsten Carbide（WC） reintorced N l-basecl selt-uuxmg alloy composite coating prepared with oxy- acetylene flame spray-welding was investigated with scanning electron microscopy （SEM） and energy dispersive X-Ray Spectrometry （EDS）,X-ray diffraction （XRD） and transmission electron microscopy（TEM）. The wear performance of the spray-welding coating, hard chromium layer and Q235 steel were tested with a MLS-225 wet sand rubber wheel abrasive wearing tester. The results indicated that the microstructure of spray-welding coating was composed of γ-Ni solid solution, in which large amounts of coarse WC and fine carbide grains such as Cr7C3, Cr23C6 and Ni3B dispersed. The weight loss of abrasive wear of hard chromium layer and Q235 steel were 1.86 and 29.8 times the spray-welding coating respectively.

关 键 词：显微组织 磨粒磨损 涂层 镍基自熔性合金 

分 类 号：TG174.442[金属学及工艺—金属表面处理]