电弧喷涂铁基减摩涂层磨损性能的分析

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。

Analysis on wear resistance of iron-based antifrictionScoating by arc Spraying

Sprayed Siron-based alloy antifrictionScoating in theSaluminum engineScylinder wallSinstead of nested cast iron cylinder linerSis an important way to realizeSthe lightweightSof automobileSengine cylinder.SThis paperSuses twoSkinds of iron-based alloySantifrictionScoatingSstrengthen the aluminum cylinder wall.SExperiment were abrased on theSdry friction and the extractionScondition, comparedSto theSgood wear resistanceSof grey cast iron,Sresults show that on theSdry friction,Slubricating effect ofSmetal oxides isSpoor compared to graphite, andSon the oilSlubricated conditions,Sthe abrasion resistance of iron-based alloy antifriction coatingsSare better than that ofSgreyScasting. The observation of coating shows that it"s mainly composed of stacked flat-particles,SbandedSoxide particles, someSunmelted particles,Sand pores.Oil storage effect of coating pore structure and surface oxide which had a great benefit to the friction reduction is indicated.