纳米铋/蛇纹石粉复合润滑脂添加剂摩擦学性能及机理初探  

Tribological Properties and Initial Exploration Mechanism of Composite Grease with Bismuth Nano-Particlesand Ultrafine Serpentine Powders

作　　者：王鹏[1] 赵芳霞[1] 张振忠[1] 杨江海[1] 

机构地区：[1]南京工业大学材料科学与工程学院,江苏南京210009

出　　处：《石油学报（石油加工）》2011年第4期643-648,共6页Acta Petrolei Sinica(Petroleum Processing Section)

基　　金：科技部中小型企业技术创新基金(08C26213700982);江苏省科技厅社会发展计划(BS2007120);南京工业大学无机及复合新材料重点实验室资助项目

摘　　要：针对纳米复合自修复脂的开发问题,在固定粉体总添加质量分数为3%的条件下,采用四球摩擦磨损试验机研究了纳米铋粉与蛇纹石粉的质量比和载荷对锂基脂摩擦学性能的影响,并通过扫描电子显微镜(SEM)和能谱分析(EDX)探讨了复合粉体在脂中的抗磨减摩机理。结果表明,纳米铋粉与蛇纹石粉复合作为添加剂有利于提高锂基脂的综合摩擦学性能,并且两种粉体的质量比为3:1时,复合锂基脂在中、低、高载荷下的摩擦学性能最优。该复合粉体提高润滑脂的抗磨减摩机理在于:摩擦副摩擦时,由于纳米铋粉所需要的自修复能量较低,铋粉优先沉积于摩擦副的表面,而粒径较大含量较少的蛇纹石粉体则位于铋粉体之上,两者都起到了自修复的作用,但以铋粉的自修复效果为主。Aiming at the problem of exploiting nano-composite self-repairing grease, the influence of various mass ratio of bismuth nanoparticles to ultrafine serpentine powders and different loads to the tribological properties of lithium grease on the four-ball machine at the condition of fixing total addition powders to be 3 0/0 was discussed. Moreover, the topography of worn surface was examined with scanning electron microscope （SEM） and energy dispersion of X-rays （EDX） was employed to analyze the composition of chemical elements on the rubbing surfaces to investigate the mechanism of friction reduction and anti-wear of composite powders as additives in grease. The results showed that the composite powders improved the comprehensive tribological properties of lithium grease and the composite grease had the optimum tribological properties under all loads at the condition of mass ratio of the two powders being 3 ： 1. The mechanism of the addition of the composite powders improving tribological properties was following. Bi nano particles were deposited first on the surface of worn pairs, then the ultrafine serpentine powders were deposited on the Bi boundary film due to their large powder size and small content. Both powders played a role of self-repairing on the worn surface, but mainly Bi nano-particles did so.

关 键 词：纳米铋粉 超细蛇纹石粉 润滑脂 摩擦学性能 机理 

分 类 号：TG115.5[金属学及工艺—物理冶金]