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PCr Mo钢是导致火炮系统故障的磨损失效零部件主要材料.为了提高零部件的寿命,将固体润滑技术引入火炮抗磨减磨设计中.选取8~10μm和3~5μm两种粒度下二硫化钼作为固体润滑材料,采用激光熔覆工艺在PCr Mo钢试样表面制备润滑涂层.通过对涂层宏观性能表征,发现粒度小的涂层熔覆厚度较好;采用扫描电镜和能谱仪分别对涂层表面、剖面微观形貌和化学成分进行分析,发现涂层表面有凹坑产生,且凹坑中氧的含量明显高于光滑表面;涂层剖面与基体结合处存在一定的缝隙,涂层元素与基体元素发生了熔渗.进一步开展的摩擦磨损试验表明:与PCr Mo钢裸基材试样相比,两种粒度下润滑涂层试样摩擦系数和磨损量皆降低,磨损量分别为14.84%和42.01%,其中大粒度下涂层摩擦性能较优.二硫化钼润滑涂层起到了很好的润滑效果,可以作为火炮磨损零部件减磨的有效手段.
PCr Mo steel is the main component of worn-out parts which cause the failure of artillery system.In order to improve the service life of parts, the solid lubrication technology was introduced into the anti-wear and anti-wear design of artillery.Divided by two kinds of particle sizes of 8 ~ 10μm and 3 ~ 5μm, Molybdenum as solid lubricating material, laser cladding was used to prepare lubricating coating on the surface of PCr Mo steel specimen.According to the macroscopic characterization of the coating, it was found that the coating thickness of the coating with small grain size was better; the scanning electron microscopy and energy dispersive spectrometer The surface morphology, microstructure and chemical composition of the coating were analyzed. It was found that the surface of the coating had pits. The content of oxygen in the pits was obviously higher than that of the smooth surface. There was a certain gap between the coating and the substrate, The infiltration of the coating element and the matrix element occurred.Further tests of friction and wear show that the friction coefficient and the wear amount of the lubricating coating sample are lower than that of the PCr Mo steel bare substrate sample, Respectively 14.84% and 42.01%, among which, the friction performance of the coating under the large particle size is better.Muldenum disulfide lubricating coating plays a very good lubricating effect, which can be used as an effective means to reduce wear of artillery components.