17-4PH不锈钢基体激光熔覆制备球形WC/Ni基复合涂层  

Fabrication of Spherical WC/Ni-based Composite Coating on 17-4PH Stainless Steel by Laser Cladding

作　　者：杨胶溪[1] 雷丽[1] 丁啸[1] 王喜兵[1] 郭江[1] 左铁钏[1] 

机构地区：[1]北京工业大学激光工程研究院,北京100124

出　　处：《硬质合金》2010年第4期199-205,共7页Cemented Carbides

基　　金：国家科技计划"973"项目(2006CB605206-3);国家自然科学基金项目(50971004);北京市科技创新平台――短流程激光制造平台(1010005366901)

摘　　要：为了制备高性能耐磨带,提高工件的使用寿命,利用激光宽带熔覆技术在17-4PH不锈钢表面沉积镍基合金做为过渡层,然后熔覆球形WC/Ni基复合涂层。对激光熔覆层分别采用扫描电镜(SEM)、能谱仪(EDS)、X射线衍射(XRD)等检测分析手段进行形貌观察、成分分析、物相表征等,并使用MMG-10型摩擦磨损试验机进行涂层耐磨性能测试。研究结果表明,采用激光熔覆技术可制备高质量WC/Ni基复合涂层,碳化钨质量分数达到65%,涂层冶金质量、裂纹尺寸、稀释率等满足技术要求。复合涂层的耐磨性为镍基合金的15倍,但其平均摩擦系数(0.926)高于镍基合金(0.762)。In order to fabricate high performance wear area and increase the service life of the component, the Nibased alloy was deposited by wide-band laser cladding technique on 17-4PH stainless steel as the buffer layer and then the spherical WC/Ni based composite coating was deposited. The morphology of the laser cladding coating was observed by scanning electronic microscope （SEM）, the composition was analysed by EDS, the phase transformation was characterized by XRD and the wear resistance was tested by MMG-10 abrasion machine. The results show that high quality WC/Ni based composite coating comprising 65% of tungsten carbide can be fabricated by laser cladding technique. The metallurgical quality, crack size and dilution rate of the coating can meet the specification. The wear resistance of the composite coating is about 15 times as much as the Ni-based alloy and its average friction coefficient （0.926） is higher than Nibased alloy （0.762）.

关 键 词：激光宽带熔覆 球形碳化钨 复合涂层 耐磨性能 

分 类 号：TG174.44[金属学及工艺—金属表面处理]