铜合金表面激光熔覆Ni-Cr-TiB_2-CaF_2涂层组织及性能  

Microstructure and Frictional Behavior of Laser-cladding Ni-Cr-TiB_2-CaF_2 Composite Coatings

作　　者：姚延松[1,2] 赵彦文[3] 房刘杨 高秋实[1,2] 秦阳[1,2] 闫华[1,2] 张培磊[1,2] 

机构地区：[1]上海工程技术大学材料工程学院 [2]上海市高强激光智能加工装备关键技术产学研开发中心 [3]郑州职业技术学院汽车工程系

出　　处：《特种铸造及有色合金》2017年第7期766-770,共5页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(51405288;51605276);研究生科研创新资助项目(16KY0503;16KY0501)

摘　　要：在Cu-Cr-Zr合金表面上以KF-6为过渡层,激光熔覆制备了Ni-Cr-TiB_2-CaF_2复合涂层,研究了不同含量的TiB_2颗粒增强相对复合涂层组织及性能的影响。采用光学显微镜(OM)、扫描电镜(SEM)、能谱仪(EDS)和X射线衍射仪(XRD)等手段分析了复合涂层的显微组织和硬度,测试了涂层的摩擦磨损性能。结果表明,TiB_2含量为5%、10%的复合涂层组织主要由颗粒相和树枝晶组成;随着TiB_2含量增加,复合涂层组织中生成了板状组织和TiB_2团聚物。TiB_2含量为20%的复合涂层显微硬度(HV_(0.1))达1 200,约为铜合金的12倍;常温摩擦因数为0.30左右,耐磨性能优异。Ni-Cr-TiB2-CaF2 composite coating was prepared by laser cladding on the surface of the Cu-Cr- Zr alloy with KF-6 as transition layer in order to understand influence of different mass percentage of TiB2 ceramic particles reinforced phase on microstructure and properties of the composites prepared. Mi- crostructure and micro-hardness of the composite coating are characterized by optical microscopy （OM）, scanning electron microscopy （SEM）, energy dispersive spectrometer （EDS） and X-ray diffraction （XRD）. The friction and wear properties of the coating were evaluated. The results indicate that micro- structure of the composite coating with 5% and 10% TiB2 is mainly composed of particles and dendritic structure. With the increase of TiB2 content, plate structure and block aggregation of TiB2 can be ob- served in microstructure of the composite coating. The micro-hardness of the composite coating with 20% TiB2 is about 1 200 HV0.1, which is about 12 times of the copper alloy. In addition, the frictional coefficient of composites with wear-resisting performance is about 0.30 at room temperature.

关 键 词：铜合金 激光熔覆 复合涂层 TIB2 摩擦特性 

分 类 号：TG174.4[金属学及工艺—金属表面处理]