摘要
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 material of wear failure parts resulting in gun faults. In order to improve the life of parts, the solid lubrication technology is applied in the design of gun anti-attrition. The Mo S2 powders of two particle sizes, i.e. 8 - 10 μm and 3 - 5 μm, were selected as the solid lubrication material. The laser cladding was used to prepare lubricating coating on the surface of PCr Mo specimens. In analysis of macroscopic properties of coating, Mo S2 coating of smaller particle size was thicker than that of larger particle size. The scanning electron microscope with energy dispersive spectrometer（EDS） was used to analyze the micro topography and chemical constituent of surface and subsurface. There were steel pits on the coating surface. The content of oxygen in the pit was higher than that of the smooth surface. The gap between the coating and substrate was observed. The EDS analysis revealed the infiltration between the coating and substrate. Compared with PCr Mo steel, both the friction coefficient and wear of two coatings were low. The reduction of wear were 14.84% and 42.01% for the two coatings. The coating under larger particle size had better tribological properties. As a result, Mo S2 lubricating coating were effective to reduce the wear of gun parts.
出处
《摩擦学学报》
EI
CAS
CSCD
北大核心
2016年第2期240-246,共7页
Tribology
基金
清华大学摩擦学国家重点实验室开放基金(SKLTKF13B15)资助~~
