铁基含油轴承材料表面硫化改性及摩擦学性能

Surface sulfurization modification and tribological properties of iron-based oil bearing materials

为改善边界润滑工况下铁基含油轴承材料的摩擦学性能,采用低温液体渗硫技术在材料表面形成一层固体渗硫层,微观检测渗硫层形貌与成分,并在端面摩擦磨损试验机上进行摩擦学实验,分析其摩擦磨损性能与自润滑机理。结果表明:渗硫层中固体润滑剂的主要成分为FeS,硫化物沿着基体孔道由材料表面向内部扩散,渗硫层的厚度约为15μm;与未硫化材料相比,硫化材料的摩擦因数明显降低,且硫化时间越长,轴承表面渗硫层的减摩性能越好;表面硫化改性后,利用轴承基体多孔含油与表面渗硫层的液固协同润滑作用,其综合摩擦磨损性能比单纯固体润滑或单纯油润滑的减摩性能都要好,边界润滑工况下的抗擦伤、抗咬合性能得到改善。

To improve the tribological properties of iron-based oil materials under boundary lubrication,a solid sulfurization layer was formed on the materials surface by low-temperature liquid sulphurizing technology.The morphology and composition of the solid sulfurization layer were sutided.The tribological experiments were tested on the end-face friction and wear tester to reveal its self-lubricating mechanism.The results show that the main composition of the sulfide layer is FeS.The sulfide diffuses from the surface to the interior along the matrix pore,and the thickness of the sulfide layer is about 15 um.Compared with the unvulcanized sample,the friction coefficient of the vulcanized sample is obviously lower.And the longer the vulcanization time,the better the lubrication property.After surface modification,the comprehensive friction and wear performance is better than that of only solid or oil lubrication for the liquid-solid synergetic lubrication.And the anti-abrasion and anti-occlusal properties are improved under the boundary lubrication condition.