电弧喷涂铁基减摩涂层磨损性能的分析

Analysis on Wear Resistance of Iron-based Antifriction Coating by Arc Spraying

在铝制发动机缸体内壁喷涂铁基减摩涂层代替在其内嵌套铸铁缸套,是实现汽车发动机缸体轻量化的一条重要途径。采用两种铁基合金制作铝制缸体内壁的减摩涂层,在干摩擦、浸油条件下分别进行磨损实验,并与耐磨性较好灰铸铁进行对比,结果显示干摩擦时金属氧化物的润滑效果较石墨差,而油液润滑条件下涂层耐磨性均优于灰铸。观察涂层发现其主要由扁平化粒子堆叠而成,粒子之间夹杂着带状氧化物,还存在一些未熔颗粒、孔隙,表明涂层的孔隙结构的储油效应和表面氧化物起到了明显的减摩作用。

Sprayed iron-based alloy antifriction coating in the aluminum engine cylinder wall instead of nested cast iron cylinder liner is an important way to realize the lightweight of automobile engine cylinder. Two kinds of iron-based alloy antifriction coating strengthen the aluminum cylinder wall are used. Experiment as abrased on the dry friction and the extraction condition,compared to the good wear resistance of grey cast iron,results show that on the dry friction,lubricating effect of metal oxides is poor compared to graphite,and on the oil lubricated conditions,the abrasion resistance of iron-based alloy antifriction coatings are better than that of grey casting. The observation of coating shows that it＇s mainly composed of stacked flat-particles,banded oxide particles,some unmelted particles,and pores. Oil storage effect of coating pore structure and surface oxide which had a great benefit to the friction reduction is indicated.