MnZnFe_2O_4磁性纳米添加剂抗磨减磨及自修复效应研究  

Tribological Properties and Self-Healing Action of Nano Magnetic Particles MnZnFe_2O_4

作　　者：冯雪君[1] 杨志伊[1] 

机构地区：[1]中国矿业大学机电工程学院,江苏徐州221116

出　　处：《中国矿业大学学报》2007年第5期653-657,共5页Journal of China University of Mining & Technology

基　　金：国家高技术研究发展计划(863)项目(2002AA302608)

摘　　要：利用四球和立式万能摩擦磨损试验机考察了MnZnFe2O4纳米磁性微粒作为润滑油添加剂抗磨减摩性能及对磨损表面的修复作用,并用扫描电子显微镜观察分析了磨斑表面形貌.结果表明,MnZnFe2O4纳米微粒添加剂能显著提高润滑油的承载能力,且减小磨斑直径,减小磨损表面犁沟.但MnZnFe2O4纳米微粒添加剂对润滑油的抗磨减磨效果受加载载荷影响:低载时,添加MnZnFe2O4纳米微粒润滑油的摩擦系数与基础油相比无明显改善;高载时,摩擦系数至少降低16%.这表明高载有利于MnZnFe2O4纳米微粒在摩擦表面沉积并在接触区的高温高压作用下熔融铺展,形成低剪切强度的表面膜,并对磨损表面具有一定的修复作用.The tribological properties of the nano magnetic particles additive MnZnFe2O4 in lubricating oil were evaluated using a four-ball tribological testing machine, and the self-healing action of the additive to the worn steel surface was examined on a vertical universal tribological testing machine. The morphologies and elemental distributions on worn steel surfaces were analyzed using a scanning electronic microscopy. The results show that nano particles MnZnFe2O4 contributed greatly to the improvement of load of lubricating oil and reduced wear scar diameter（WSD）. However, anti-friction properties of MnZnFe2O4 were influenced by load. Compared with base oil, friction coefficient of oil with nano particles MnZnFe2O4 as lubricant additives was not improved at a low load. On the contrary, friction coefficient was decreased by more than 16 % at a high load. The improvement shows that higher load was helpful for adsorption and deposition of nano particles MnZnFe2O4 on worn steel surface as well as fusion and spreading out by high temperature and pressure in touching area, thus leading to a low-strength shearing membrane which offers certain healing action to worn surface.

关 键 词：纳米MnZnFe2O4磁性微粒 载荷 润滑油 抗磨减磨 自修复 

分 类 号：TH117.22[机械工程—机械设计及理论]