细WC添加量对Ni基WC喷焊涂层性能的影响  

Effect of Fine WC Powder Content on the Performance of WC Reinforced Ni-based Spray-welding Coating

作　　者：王群[1] 向晶[1] 伍细斌[1] 杨凤根 唐智华 

机构地区：[1]湖南大学材料科学与工程学院,湖南长沙410082 [2]赣州章源钨业新材料有限公司,江西赣州341000

出　　处：《湖南大学学报（自然科学版）》2011年第12期57-61,共5页Journal of Hunan University:Natural Sciences

基　　金：The Fundamental Research Funds for the Central University

摘　　要：采用金相显微镜和X射线衍射仪分析了氧乙炔火焰喷焊WC含量不同的Ni基WC涂层的显微组织和相结构,采用湿砂橡胶轮式磨粒磨损实验机对各涂层的抗磨粒磨损性能进行了比较研究,并采用扫描电镜观察了喷焊粉末的形貌和喷焊层的磨损形貌.结果表明,喷焊层的组织为在g-Ni固溶体基体上弥散分布着细小的碳(硼)化物硬质相,这些细小的硬质相主要是Cr7C3,Cr23C6,Cr2B,CrB2和WC.Ni基WC喷焊层的硬度随WC添加量的增加先增加后减小,当WC的质量分数为25%时,Ni基体WC喷焊涂层的硬度最高,相应的抗磨粒磨损性能最好.The microstructures and phase compositions of the WC reinforced Ni-based self-fluxing alloy composite coatings prepared by oxy-acetylene flame spray-welding were investigated with optics microscope（OM）and X-ray diffraction （ XRD） . The wear performance of the spray-welding coatings was tested by a MLS-225 wet sand rubber wheel abrasive wearing tester. The micrograph of the sprayed powders and the worn surfaces of the coatings were examined with scanning electron microscopy （SEM）. The results have shown that the microstructures of the spray-welding coating are composed of γ-Ni solid solution,with large amounts of fine carbide grains such as Cr7C3,Cr23C6, Cr2B, CrB2 and WC particles. The hardness of the spray and fused Ni base WC composite coatings firstly increased and then decreased with the added content of WC,and the WC content for the highest hardness and abrasive resistance of coating is 25%.

关 键 词：磨粒磨损 喷焊 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]