期刊论文

中文

激光与红外

1001-5078

2013

43

4

371-375

10.3969/j.issn.1001-5078.2013.04.005

湖南省科技计划项目（No.2012FJ3101）资助；

本校为第一机构

采用5 kW横流CO_2激光器,在TC4钛合金表面熔覆TiC与TiB_2混合粉末,制备出了组织细密、无裂纹与气孔的TiC/TiB复合陶瓷涂层。采用扫描电镜(SEM)、能量散射X谱仪(EDX)、X射线衍射仪(XRD)以及HXD-1000B显微硬度计,分析了熔覆层的显微组织形貌、成分与物相结构,测试了激光熔覆层的显微硬度。结果表明,激光熔覆原位制备的TiC/TiB复合涂层与基体呈冶金结合,熔覆层组织呈现出由表层十字形花瓣状TiC组织到结合区致密小颗粒TiC组织分布变化的特点。同时,熔层中有大量的纤维状TiB组织填充在十字形花瓣状组织与颗粒状组织之间,且纤维组织从熔覆层表层到结合区逐渐增加。熔覆层的显微硬度值最高可达1240 HV_...

The pore-free and cracks-free TiC/TiB composite coating is in-situ synthesized on TC4 titanium alloy by laser cladding with 5 kW continuous wave CO2 laser.Microstructure morphology,composition and phase distributions of the composite coating are investigated by scan electron microscopy（SEM）,energy-dispersive X-ray spectroscopy（EDX）,X-ray diffraction（XRD）,respectively.Micro hardness is measured by HXD-1000B microhardness tester.The results show that the TiC/TiB composite coating is well metallurgical bonded with TC4 titanium substrate.The ...