工艺参数对原位生成TiN/Ti3Al复合涂层微观组织的影响

材料热处理学报, 2012, 33(z2): 124-128.

工艺参数对原位生成TiN/Ti3Al复合涂层微观组织的影响

许金沙 ^1, , 陈晓卿 ^2, , 张显程 ^3, , 轩福贞 ^4,

1.华东理工大学承压系统与安全教育部重点实验室,上海200237

2.华东理工大学承压系统与安全教育部重点实验室,上海200237

3.华东理工大学承压系统与安全教育部重点实验室,上海200237

4.华东理工大学承压系统与安全教育部重点实验室,上海200237

基金项目: 国家自然科学基金(10972078,51175177)

关键词：钛合金 , 复合涂层 , 微观组织

Effect of processing parameters on microstructure of in situ synthesized TiN/Ti3Al composite coating

采用等离子喷涂与激光渗氮技术相结合的工艺方法,在Ti6Al4V合金表面实现了TiN/Ti3Al金属间化合物复合涂层的快速制备.首先在Ti6Al4V基体表面利用等离子喷涂的方法预置一层纯铝涂层；然后在纯氮环境下,利用激光渗氮化技术对试样表面进行合金化处理.采用扫描电镜(SEM)、X射线衍射(XRD)等试验手段,研究了氮气流量以及激光扫描速度两个激光渗氮工艺参数对TiN/Ti3Al金属间化合物复合涂层的微观组织的影响.结果表明,复合涂层中TiN相的含量随着氮气流量的增加与激光扫描速度的减小而增加.工艺参数对涂层中TiN增强相的形貌有着重要影响.在高氮气流量、低激光扫描速度条件下制备出的涂层中,TiN相呈颗粒状.对于低氮气流量、高激光扫描速度条件下,TiN增强相呈树枝状.

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