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以钛粉和铜粉为原料,利用氮弧熔敷技术,在T3紫铜表面原位生成Ti_2Cu·TiN-TiN增强Cu基熔覆层。利用光学显微镜、扫描电镜和X射线衍射分析其显微组织及相组成与分布,利用显微硬度仪、摩擦磨损试验机进行硬度和磨损性能的测试。结果表明,通过氮弧熔敷可反应生成TiN和Ti_2Cu·TiN,TiN呈不规则球状和枝晶状,Ti_2Cu·TiN呈块状分布,并随Ti粉比例的提高,TiN和Ti_2Cu·TiN数量逐渐增多。熔覆层组织均匀致密,无气孔夹杂等缺陷,截面呈”金结合。熔覆层(20%Ti)硬度达350 HV,是纯铜的5倍左右。熔覆层(15%Ti)的耐磨性能显著提高,摩擦系数为0.56。
Using titanium powder and copper powder as raw materials, Ti2Cu · TiN-TiN reinforced Cu-based cladding layer was formed on the surface of T3 copper by nitrogen arc welding. The microstructure, phase composition and distribution were analyzed by optical microscopy, scanning electron microscopy and X-ray diffraction. The hardness and wear properties were tested by using microhardness tester and friction and wear tester. The results show that TiN and Ti_2Cu · TiN can be formed by nitrogen arc welding. The TiN presents irregular spheres and dendrites, and the bulk of Ti_2Cu · TiN is massive. With the increase of Ti content, TiN and Ti_2Cu · TiN gradually increase . Cladding layer is uniform and dense, without pores inclusions and other defects, the cross section was “gold.” The cladding (20% Ti) hardness of 350 HV, is about 5 times of pure copper. Grinding performance increased significantly, the friction coefficient of 0.56.