期刊论文

Microstructure and properties of laser cladding with different TiN powder on Zr-4 alloy surface

Wang, X.

中文

金属热处理

0254-6051

2017

42

1

115-119

10.13251/j.issn.0254-6051.2017.01.026

基金项目：国家重大专项子课题（2015ZX06004001-002） 湖南省自然科学基金（2015JJ6098）

本校为第一且通讯机构

通过在Zr-4合金表面分别预置3种不同种类的TiN粉末,利用5 kW横流CO_2激光器在锆合金表面原位制备TiN/ZrN复合涂层。利用扫描电子显微镜(SEM) 、X射线衍射仪(XRD) 、显微硬度计和万能摩擦磨损试验机表征分析了熔覆层的显微组织、物相、显微硬度和室温干滑动摩擦磨损性能。结果表明: 3种熔覆层表层均由TiN、ZrN、ZrO_2、TiZrN_2组成,由于硬质相的存在,熔覆层均具有较高的硬度和良好的耐磨性能;其中,添加纳米TiN粉末的激光熔覆层组织最为细小均匀,熔覆层截面的硬度梯度分布最为均匀,磨损质量损失最小,磨损机制表现为磨粒磨损。

Three different types of TiN powders were precoated on the surface of Zr-4 alloy, the TiN/ZrN composite coating was in-situ synthesized on the surface of zirconium alloy by CO2 transverse flow laser. Microstructure, phase, microhardness and dry sliding wear resistance of the coating at room temperature were studied by scanning electron microscopy (SEM), X-ray diffractometer (XRD), micro-hardness tester, friction and wear tester. The results show that the cladding layers are consisted of TiN, ZrN, ZrO2 and TiZrN2. Owing to the existence of hard ...