期刊论文

Wang, X.

中文

金属热处理

0254-6051

2015

40

3

58-62

10.13251/j.issn.0254-6051.2015.03.013

湖南省科技计划项目（2012FJ3101）；

本校为第一且通讯机构

采用5 kW 横流CO_2激光器,在TC4钛合金表面熔覆TiC、TiB_2与Ni的混合粉末,制备了无气孔、无裂纹、组织均匀致密的复合涂层。用SEM、EDS、XRD、显微硬度计以及立式万能摩擦磨损试验机分析了激光熔覆层的显微组织、成分和物相,测试了激光熔覆层横截面显微硬度,以及覆层耐磨性能。结果表明,激光熔覆复合涂层与基体呈冶金结合; 熔覆层组织从表层到结合区呈现出由棒状、块状向树枝状、颗粒状转变的趋势,且主要由Ti、TiC、TiB、Ti_2Ni、TiNi 等相组成; 熔覆层显微硬度最高可达863 HV0.2,为基体的2.5倍; 熔覆层耐磨性能较TC4钛合金明显提高。

The pore-free and cracks-free composite coating was in-situ synthesized on the surface of TC 4 titanium alloy by laser cladding with 5 kW continuous wave CO2 laser.Microstructure, composition and phase distributions of the composite coating were investigated by means of SEM, EDS, XRD, and microhardness , and friction wear properties were measured by microhardness tester and wear test machine respectively .The results show that the composite coating is well metallurgical bonded with TC 4 titanium substrate .The microstructure morphology of clad layer changes from rod and block shape at the surf...