Co+C离子注入层的摩擦磨损行为研究

Tribological Properties of Stainless Steel Modified with Dual-and Co-implantation of Co+C Ions

采用金属蒸气真空弧放电离子源在奥氏体不锈钢上进行Co+C离子的双注入与同时注入,研究了Co+C双注入层和同时注入层元素的成分深度分布及其摩擦磨损行为.结果表明:双注入和同时注入方式均能够在不锈钢表面产生1个Co与C共存区域,注入离子浓度范围宽化,强化范围增加;双注入和同时注入均能够提高不锈钢的表面硬度,降低其表面的摩擦系数,提高其耐磨性;采用大剂量同时注入方式改善摩擦磨损性能的效果优于双注入方式.

Cobalt and carbon ions were dual- and co-implanted into austenitic stainless steel by a metal vapor vacuum arc （MEVVA） ion source with total dose of 6 × 10^17 ions/cm^2 and 8 × 10^17 ions/cm^2. Microstructural properties of the implanted surface were investigated by Auger electronic spectroscopy and microhardness test, and tribological performance of the modified layer were carried out on a pin-on-disc tribometer and their friction and wear properties were discussed. Analysis of AES results show that a Co ＋ C co-existed zone were obtained by dual- and Co-implantation of Co ＋ C, leading to broadened concentration profiles and extended strengthened depth. Both dual- and co-implantation of Co ＋ C greatly increased the near-surface hardness and improved the wear resistance of stainless steel. Compared with the unimplanted sample, wear volume loss was reduced by 82% with dual-implantation and by 76% -97% with co-implantation. Moreover, co-implantation of Co ＋ C with higher dose was more effective than dual-implantation for improving wear resistance.