润滑油缺失工况下不同活塞环涂层对缸套摩擦磨损对比研究

Comparative Study on Friction and Wear of Cylinder Liner with Different Piston Ring Coatings under the Condition of Lack of Lubricating Oil

为研究润滑油缺失工况下不同活塞环涂层在不同温度下与缸套的摩擦学性能,选取5种商用活塞环涂层,利用扫描电子显微镜观察不同涂层的截面形貌,利用往复式摩擦磨损试验机,在润滑油缺失工况下,分别在常温、200℃和350℃条件下进行摩擦磨损试验,利用轮廓仪和光学显微镜分别观察摩擦试验后的磨损量和磨痕形貌。结果表明:CrN基涂层和CKS涂层主要为黏着磨损,对缸套磨损大,不同温度下摩擦学性能稳定;含DLC涂层主要为磨料磨损,常温摩擦因数小,高温下不同涂层有较大差异,其中CDC+DLC涂层综合性能最佳。

In order to study the tribological properties of different piston ring coatings and cylinder liner at different temperatures under the condition of lack of lubricating oil,five commercial piston ring coatings were selected,and the cross-sectional morphologies of different coatings were observed by scanning electron microscope.Using a reciprocating friction and wear tester,the friction and wear tests were carried out under the condition of lack of lubricating oil at normal temperature,200℃and 350℃,respectively.The results show that the CrN-based coating and the CKS coating are mainly adhesive wear,which has a large wear on the cylinder liner,and the tribological properties are stable at different temperatures.The DLC-containing coatings are mainly abrasive wear,which have small friction coefficient at room temperature,but have significant differences at high temperatures.The comprehensive performance of CDC+DLC coating is the best.