双层辉光等离子制备TiN渗镀层摩擦学性能研究

Research on Tribological Properties of TiN Synthesized by Double Glow Plasma Permeating Technique

采用双层辉光等离子表面合金化技术在钢铁材料表面直接复合形成超硬耐磨的TiN渗镀层.利用WTM-1E可控气氛微型摩擦磨损试验仪和GZTC-1磨粒磨损试验仪,对TiN渗镀层的摩擦磨损性能进行了研究.研究结果表明:在室温干滑动磨损试验条件下,TiN渗镀层磨损表面光滑平整没有出现犁沟变形及黏着磨损痕迹,摩擦系数低,表现出了优异的耐磨性及良好的减摩性能.在相同磨损条件下,TiN渗镀层相对磨损速度最小,耐磨性较未处理的Q235钢试样提高7.81倍,较T10钢淬火+回火试样提高5.625倍,较3Cr13不锈钢渗氮试样提高7倍;在磨粒磨损条件下,渗镀层的磨损失效形式主要是镀层的碎裂与剥落,显微切削是轻微的,基本上没有发生塑性变形.随着砂纸砂粒度的增加,碎裂与剥落的程度逐渐加深.在本文试验条件下,TiN渗镀层的磨损机理主要为应力疲劳,其次为显微切削.

Superhard wear-resistant TiN films formed on the surface of plain carbon steel by using double glow plasma surface alloying technique. WTM-1E type controlled atmosphere minitype friction-abrasion testing equipment and GZTC-1 grain-abrasion test machine were employed for wear resistance experiments. The results show that under dry sliding wear test conditions, there was no ploughing and adhesion wear trace on the smooth and leveling TiN permeation layer. So the TiN permeation layer with a low friction coefficient has excellent wear resistance and good antifriction performance. Under the same conditions, TiN permeation layer had the least relative wear rate. Its wear resistance was 7.81 times higher than untreated Q235 steel, 5.625 times higher than quenched + tempered T10 steel and 7 times higher than nitrided 3Cr13 steel. Exfoliation and fragmentation were two main modes of wear failure for the permeation layer, under abrasive wear conditions. Micro-cutting was slight nearly no plastic deformation. The degree of fragmentation and exfoliation deepened gradually with fineness of sand paper increasing. In this research, the wear mechanism of TiN permeation layer mainly was stress fatigue and micro-cutting.