钛合金表面氩弧熔覆原位合成TiB_2-TiN涂层组织及耐磨性能  

Microstructure and wear resistance of in-situ synthesis TiB_2-TiN particulates of composite coating reinforced titanium alloy surface by argon arc cladding

作　　者：王振廷[1] 丁元柱[1] 梁刚[1] 

机构地区：[1]黑龙江科技学院材料科学与工程学院,哈尔滨150027

出　　处：《焊接学报》2011年第12期105-108,118,共4页Transactions of The China Welding Institution

摘　　要：以BN和Ni60A合金粉末为熔覆材料,采用氩弧熔覆技术在TC4合金表面原位合成TiB2-TiN增强颗粒耐磨涂层.利用X射线衍射仪、扫描电子显微镜和摩擦磨损试验机对熔覆层的组织和性能进行分析测试.结果表明,复合涂层的显微组织沿层深方向分为熔覆区、结合区和热影响区;熔覆层与基体呈良好冶金结合,TiB2-TiN颗粒弥散分布,尺寸细小;涂层具有较高的硬度,在室温干滑动磨损试验条件下具有优良的耐磨性能;其磨损机制为显微切削磨损和粘着磨损.The composite coating reinforced by in-situ synthesized TiB2 and TiN particulates was prepared on the surface of TC4 alloy by means of argon arc cladding using BN and Ni60A powders as raw materials.The microstructure of TiB2-TiN composite coating were characterized by means of X-ray diffraction(XRD)and scanning electron microscopy(SEM).The wear properties of coating were examined using friction and wear tester.Experimental results show that three regions with different microstructures existed in the coating,the cladding zone,the binding zone and the heat-affected zone along the depth profile.There is a good metallurgical bonding between the composite coating and the substrate,the TiB2 and TiN particulates are dispersively distributed in the coating.The composite coating exhibits high microhardness and excellent wear resistance under dry sliding wear test condition.The wear mechanism of the coating is micro-cutting wear and adhesive wear.

关 键 词：氩弧熔覆 原位合成 二硼化钛和氮化钛颗粒 耐磨性 

分 类 号：TG174.44[金属学及工艺—金属表面处理]