Ti(C、N)陶瓷颗粒对镍基激光熔覆层组织和性能影响  

Influence of Ti (C、N) Particle on Microstructure and Performance of Laser Cladding Ni-based Coating

作　　者：齐勇田[1] 施瀚超[1] 

机构地区：[1]山东大学材料科学学院,济南250061

出　　处：《中国表面工程》2008年第2期26-30,共5页China Surface Engineering

基　　金：山东省自然科学基金资助项目(Z2006F07)

摘　　要：采用CO2激光熔覆技术在铸造半钢轧辊表面上制备了含有Ti（C、N）增强相的镍基涂层，对重量比分别为20％、30％、40％的Ti（C、N）颗粒的3种熔覆层进行了研究。用X-射线衍射仪、扫描电镜和光学显微硬度计对复合熔覆层中强化相粒子的成分、形貌、尺寸及熔覆层的显微硬度进行分析。结果表明：Ti（C、N）相在（200）晶面的衍射峰强度最高，形貌呈近似圆形、菱形等不规则形状，大小在0．5-5．0μm之间；随着Ti（C、N）含量的增加，熔覆层的硬度明显提高，这主要是由于Ti（C、N）陶瓷颗粒在熔覆层中弥散和细晶强化共同作用的结果。The Ni-based alloy composite coating reinforced by Ti（C,N） particles was prepared on the substrate of Adamite cast iron by laser cladding technique. Three different kinds of laser cladding layers were studied in this paper. The microstructure of the cladding layer was analyzed by X-ray diffractometer （XRD）, scanning electron microscope （SEM） and energy dispersive spectrometer （EDS）. The hardness of coatings was measured by microhardness tester. The results showed that fine Ti （C,N） phase in the coating showed stronger diffraction peak at （200） face, it was dispersed homogeneously in the matrix during laser cladding process. The grain size of Ti （CN） particles was within 0.5-5μm. Ti（C,N） particles were round or irregular in shape. The laser cladding layers reinforced by Ti （C0.3N0.7） particles showeed higher hardness, and its micro-hardness was increaseed with the increase of Ti（C,N） content.

关 键 词：Ti(C、N) 激光熔覆 显微硬度 组织 

分 类 号：TG159.9[金属学及工艺—热处理]