激光熔覆Ni/TiC复合涂层组织与性能  

Microstructure and Properties of Laser Clad Ni /TiC Composite Coating

作　　者：戴晟[1,2] 左敦稳[2] 方淳[1] 赵先锐[1,2] 王金芳[1,2] 朱流[1] 

机构地区：[1]台州学院机械工程学院,浙江台州318000 [2]南京航空航天大学机电学院,江苏南京210016

出　　处：《机械制造与自动化》2014年第3期63-65,68,共4页Machine Building & Automation

基　　金：浙江省科技计划项目(2012C21107;2013C31089);浙江省教育厅科研项目(Y201223942);江苏省普通高校研究生科技创新计划项目(CXZZ12_0141);浙江省工量刃具检测与深加工技术研究重点实验室开放基金(ZD201207)

摘　　要：采用激光熔覆技术在45钢样品表面制备了Ni/TiC复合涂层,利用光学显微镜、SEM,EDS,XRD、显微镜硬度计及摩擦磨损试验机等检测设备研究了Ni/TiC复合涂层的组织和性能。试验结果表明:Ni/TiC复合涂层没有出现裂纹、孔洞等缺陷,涂层与基体之间具有良好的冶金结合,涂层显微硬度沿层深皆呈明显的阶梯状分布,最外表面的熔覆层硬度最高,约为800 HV;熔覆试样的比磨损率比基体试样的比磨损率下降了86.5%,表明Ni/TiC复合涂层具有较好的耐磨性能。Ni/TiCcomposite coating is prepared on the 45 steel substrates by laser cladding. Microstructure and wear properties of composite coatings are investigated by optical microscopy,SEM,EDS,XRD,Vickers microhardness tester and wear machine. The results show that defects, such as cracks and pores, do not occur in the Ni/TiCcomposite coating and 45 steel substrate, and the good metal urgical bonding appears between them. Microhardness of Ni/TiC composite coating along the layer depth presents an evident stepladder distribution with the highest hardness（ approx 800 HV） of the externalmost surface of the coatings. The wear rate （86.5%）of the laser clad composite coating is reduced. The result of wear experiment shows that Ni/TiCcomposite coating processes good wear resistance.

关 键 词：激光熔覆 NI TiC复合涂层 显微组织 显微硬度 耐磨性 

分 类 号：TG174.11[金属学及工艺—金属表面处理]