纯钛TA2激光气体氮化涂层的组织与性能  

Study on Microstructure and Properties of the Coating Layer on Titanium by Laser Gas Nitriding

作　　者：齐勇田[1] 刘世玺[1] 张世忠[1] 

机构地区：[1]包头职业技术学院材料工程系,内蒙古包头014030

出　　处：《钢铁钒钛》2014年第6期22-26,共5页Iron Steel Vanadium Titanium

基　　金：高等学校包头职业技术学院科学研究项目(Y201301)

摘　　要：使用快速横流的CO2连续激光器在工业纯钛TA2表面进行激光气体氮化改性处理,制备形成致密、无裂纹缺陷的改性层。用扫描电镜和能谱分析仪对激光气体氮化改性层的色泽、宏观形貌和微观组织进行分析;利用显微硬度计对氮化区域的显微硬度进行测试。研究结果表明:经过激光表面氮化处理后,在基体纯钛TA2表面发生了化合反应,生成以TiN为增强相的金黄色耐磨涂层。氮化改性层的组织主要是由细小的、枝晶状的TiN构成。随着激光输出功率的增加,TiN涂层的色泽特征由浅变深,表面形态由平整变为皱状。工业纯钛TA2显微硬度提高,表面强化明显。The process of laser gas nitriding on the surface of commercial pure titanium TA2 was carriedout and the compact coating layer without crack defects was obtained by 5 kW continuous wave CO2 laserunder N2 environment. The microstructure of nitriding coating layer was analyzed by scanning electron mi-croscopy（SEM） and energy dispersive spectrometer（EDS）, and the microhardness of the nitriding layerwas measured by microhardness meter. The results show that TiN is formed on the surface of TA2 whichserves as a reinforcing phase by laser gas nitriding. The nitriding layer mainly consists of TiN with fineand dendritic structures. The surface color and feature of the TiN coating layer change with the increase oflaser power. The microhardness and properties of TA2 are improved obviously.

关 键 词：激光气体氮化 碳化钛涂层 工业纯钛 微观组织 

分 类 号：TG174.4[金属学及工艺—金属表面处理]