激光微织构固体润滑表面高温摩擦学性能研究

目的 研究微织构纳米固体润滑剂及碳纳米管(CNTs)添加剂对微织构表面高温润滑性能的影响.方法 采用YLP-HP-1-100-100-100型光纤激光器在Cr4M04V高温轴承钢表面进行织构化处理,并填充二硫化钼(MoS2)-聚酰亚胺(PI)和不同碳纳米管添加含量的MoS2-PI-CNTs复合固体润滑剂.在环-盘接触的MMU-10G高温摩擦磨损试验机上进行了环境温度从室温到400℃的滑动摩擦性能试验.结果 填充含纳米MoS2的复合固体润滑剂的微织构表面的摩擦系数比填充含相同含量微米MoS2的低35％左右.微织构纳米MoS2-PI自润滑表面摩擦系数随碳纳米管含量的增加先减小后增大,当碳纳米管质量分数为6％时,其摩擦系数最小,且比无碳纳米管的低37％左右.在MoS2-PI纳米复合润滑剂中添加6％碳纳米管后,MoS2-PI-CNTs纳米复合润滑剂具有更高的使用温度和更低的摩擦系数.结论 纳米MoS2的润滑效果优于微米MoS2,碳纳米管有利于提高MoS2-PI复合固体润滑剂的耐热性能和润滑减摩性能.

Tribological Properties of the Laser Micro-texture Surface Filled with Solid Lubricant at Elevated Temperature

Objective To research the effect of micro texture nano lubricant and the addition of carbon nanotubes (CNTs) on micro texture composite lubricant at high temperature. Methods 4Cr4Mo4V high temperature bearing steel was textured by YLP-HP-1-100-100-100 laser and composite lubricant ofpolyimide (PI) and molybdenum disulfide (MoS2), and MoS2-PI-CNTs with different contents of CNTs were filled in the micro-dimples. Sliding friction performance of composite lubricant was investigated by the high temperature friction and wear testing machine MMU-10G using ring-plate area contact. Results The friction coefficient of nano MoS2-PI composite was lower compared to that of micron MoS2-PI composite lubricant. The friction coefficient of micro textured surface filled with the nano MoS2-PI composite lubricant decreased before increasing with the increase of the contents of the carbon nanotube. MoS2-PI-CNTs nano-composite solid lubricant had a higher operation temperature and lower friction coefficient after addition of 6wt% carbon nanotubes (CNTs). Conclusion The lubrication effect of nano MoS2 was better than that of micron MoS2, and CNTs were beneficial to improving the performance of heat resistance and lubrication antifriction.