20CrNiMo表面针状空心阴极辉光放电制备TiN研究

摘要

在真空炉内以针状钛丝为溅射源极,以氩气和氮气为放电气体,利用辉光放电现象、尖端放电和空心阴极效应在 20CrNiMo 表面复合渗镀合成TiN 改性层,目的是提高 20CrNiMo 表面的耐磨性能.利用扫描电子显微镜(SEM)观察了改性层的截面形貌;测量了改性层的显微硬度并用 XRD 观察分析了改性层的相结构;采用 MFT-4000 型高速往复磨损试验机对渗镀改性层的摩擦磨损性能进行了研究.结果表明:在试验工艺条件下 20CrNiMo 试样表面制备的TiN 改性层厚度约为 40μm.改性后表面摩擦因数为 0.169,较 20CrNiMo 基体的摩擦因数 0.324 明显减小,耐磨性能提高.%The multiple structures made of alloying and coating layers of TiN was achieved on the surface of 20CrNiMo steel by the needle-shape cathode glow discharging. It is aimed to reduce the friction coefficient of the 20CrNiMo and to improve the property of the wear-resistance. The morphology of TiN modified layer at the cross section was observed by Scanning Electron Microscope (SEM). The friction and wear behavior of the TiN/ZrN films under dry sliding against GCrl5 steel was evaluated on a MFT-4000 high speed to-and-fro wear test rig. The results showed that it was feasible to prepare TiN layer of 40 μm thickness by the needle-shape cathode glow discharging. It has been found that the TiN modified layer has excellent friction and wear-resistant behaviors. The friction coefficient of the 20CrNiMo substrate was about 0.324 under dry sliding,while the TiN modified layer experienced much abated friction coefficient to 0.169 under the same testing condition.