铜合金表面激光熔覆Ni-Ti-Si涂层微观组织及耐磨性能  

Microstructures and Wear Resistance Properties of Ni-Ti-Si Coatings on Copper Alloy Surface by Laser Cladding

作　　者：庄乔乔 张培磊[1,2] 李明川 闫华 于治水[1,2] 

机构地区：[1]上海工程技术大学材料工程学院,上海201620 [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,上海201620

出　　处：《中国激光》2017年第11期51-57,共7页Chinese Journal of Lasers

基　　金：国家自然科学基金(51375294;51605276;51405288);上海汽车工业科技发展基金(1604);上海市"创新行动计划"基础研究领域项目(17JC1400600;17JC1400601)

摘　　要：利用激光熔覆技术,在铜合金表面制备了两种Ni-Ti-Si复合涂层,测试并分析了涂层的组成、微观组织和摩擦磨损性能。结果表明,在Ni-15Ti-15Si涂层(涂层1)中主要形成了枝晶状的TiSi、TiSi/TiNi3共晶和γ-Ni相,而在Ni-35Ti-15Si涂层(涂层2)中主要形成了黑色树枝状的Ti2Ni3Si强化相和白色带状的Ti2Ni相;涂层2的平均显微硬度值为涂层1的1.3倍,约为铜基体的9.5倍;室温环境下涂层2的平均摩擦系数约为0.54,较铜基体的摩擦系数降低了35%,因此具有优异的耐磨性。Two kinds of Ni-Ti-Si composite coatings are prepared on copper alloy surfaces by the laser cladding technique. The compositions, microstructures, friction and wear properties of these coatings are measured and analyzed. The results show that the Ni-15Ti-15Si coating （coating 1） mierostructure is mainly composed of the dendritic TiSi, TiSi/TiNi3 eutectie structure and the γ-Ni phase, however the Ni-35Ti-15Si coating （coating 2） is mainly composed of the black dendritic Ti2 Ni3 Si strengthening phase and the white band shaped Ti2 Ni phase. The average microhardness of coating 2 is 1.3 times of that of coating 1 and is about 9.5 times of that of copper alloy. The coating 2 at a room temperature possesses the outstanding wear resistance with an average friction coefficient of 0.54, 35% smaller than that of the copper substrate.

关 键 词：激光技术 激光熔覆 铜合金 Ni-Ti-Si涂层 耐磨性 

分 类 号：TG115[金属学及工艺—物理冶金]