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 carried out and the compact coating layer without crack defects was obtained by 5 kW continuous wave CO2 laser under N2 environment.The microstructure of nitriding coating layer was analyzed by scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS),and the microhardness of the nitriding layer was measured by microhardness meter.The results show that TiN is formed on the surface of TA2 which serves as a reinforcing phase by laser gas nitriding.The nitriding layer mainly consists of TiN with fine and dendritic structures.The surface color and feature of the TiN coating layer change with the increase of laser power.The microhardness and properties of TA2 are improved obviously.
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