等离子体渗氮工艺自动控制系统方案与设计

针对等离子体渗氮工艺过程特殊, 控制量变化复杂, 人为因素影响较大等情况。利用自行研制的大功率直流脉冲电源进行等离子体渗氮, 在很大程度上解决了物理参数与工艺参数的耦合问题, 同时改善了灭弧性能, 为渗氮工艺自动控制提供了可能。因此,提出了一种利用智能仪表、上位机进行主从式控制等离子体渗氮工艺的自动控制方案, 实验结果表明: 该渗氮工艺控制系统可以较好地实现渗氮工艺过程控制, 提高了自动化水平, 增强了工件渗氮效果。

Wear resistance of TC4 by deformation accelerated plasma nitriding at 400 °C

An integrated low temperature nitriding process for TC4（Ti6Al4V） has been developed and the effect on wear resistance has been investigated. Through the process of solid solution strengthening—cold deformation—nitriding at 400℃, the TC4 alloy is nitrided on surface and dispersion strengthened in bulk at the same time. The white nitriding layer is formed after some time of nitriding. The nitriding speed increases with the deformation degree. The construction was investigated by XRD and the nitride is Ti3N（2-X）. The wear test was carried out and results exhibit that the nitrided samples have better wear resistance.