Zr-4合金表面激光熔覆不同类型TiN粉末的组织与性能  

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

作　　者：马建光[1] 朱卫华[2] 朱红梅[1] 廖帮亮 孙楚光[1] 王新林[1,2] 

机构地区：[1]南华大学机械工程学院,湖南衡阳421001 [2]南华大学电气工程学院,湖南衡阳421001

出　　处：《金属热处理》2017年第1期115-119,共5页Heat Treatment of Metals

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

摘　　要：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 phases in the cladding layer, all coatings are of high hardness and good wear resistance. The hardness distribution of the cladding layer which adding 5% mass fraction of nanoparticale TiN particles is the most uniform. And the wear mass loss of the layer is the least and the wear mechanism of the layer is abrasive wear.

关 键 词：锆合金 激光原位熔覆 TiN/ZrN复合涂层 摩擦磨损性能 

分 类 号：TG146[一般工业技术—材料科学与工程]