45钢表面原位摩擦化学反应膜形成过程及力学性能

Formation and mechanical properties of in situ tribo-chemical reaction film on surface of 45 steel

制备了一种用于原位摩擦化学处理技术的天然矿物微粉摩擦处理剂。采用环-块摩擦磨损试验机对其在柴油机油中的添加量进行了优化,研究了其在45钢表面的原位摩擦化学反应膜的形成过程及力学性能,探讨了形成机理。结果表明:处理剂含量为0.5 wt%时对45钢表面具有较好的优化效果,其摩擦因数和质量磨损率分别较基础油降低约19.7%和71.8%。摩擦处理表面较为光滑平整,形成了由铁的氧化物、铁镁硅酸盐及含碳化合物构成的摩擦化学反应膜,且随着时间的增加逐步由疏松多孔趋于致密连续,具有较高的力学性能,显著提高了45钢的表面强度及磨损抗力。

A kind of tribo-treatment agent,which can be applied to in situ tribo-chemical treatment,was prepared using natural mineral powders.Addition of the as-prepared agent to diesel engine oil was optimized by means of wearing test on a ring-block friction and wear tester.Forming process and mechanical properties of in situ tribo-chemical reaction film on surface of 45 steel were investigated and forming mechanism of the film was discussed.Results show that the addition of 0.5 wt% agent is most efficient for formation of in situ tribo-chemical reaction film to improve wearing performance of the surface of 45 steel.The friction coefficient and mass wear rate decreases by 19.7% and 71.8% compared to those of the base oil,respectively.The tribo-treated surface is rather smooth and a tribo-chemical reaction film mainly consisting of iron oxides,iron and /or magnesium silicates and carbon-containing compounds is formed on the steel substrate.Moreover,the porous film tended to become compact and continuous as the wearing time increased,contributing to the improvement in surface strength and wear resistance of 45 steel.