FeS表面改性制备铁基轴承材料的摩擦学性能

Tribological properties of iron-based bearing materials prepared through FeS surface modification

以Fe、C混合粉末为原料,分别以FeS、镀镍FeS作为固体润滑剂,通过粉末冶金方法制备铁基轴承材料。研究添加不同质量分数FeS和镀镍FeS对铁基轴承材料微观结构、力学性能和摩擦学性能的影响。结果表明:添加FeS的铁基轴承材料摩擦学性能提高,但是FeS与铁基材料界面结合性差,容易团聚脱落,降低铁基材料的力学性能,不利于材料的减摩耐磨性能提高。表面改性增强了FeS与基体的界面结合,材料的密度和硬度均得到提高。当添加质量分数为8%的镀镍FeS时,所制备的铁基轴承材料力学性能最优,干摩擦条件下,随着载荷增加,含镀镍FeS的铁基轴承材料摩擦系数略微下降,磨损量增加相对缓慢,磨损表面FeS富集,仅存在轻微犁沟,对偶件表面转移膜覆盖程度高、连续性好,材料的减摩耐磨性能好。

Iron-base bearing materials were prepared by powder metallurgy,using Fe and C powders as raw materials,FeS and nickel-plated FeS as solid lubricants,respectively.The effects of FeS and nickel-plated FeS on the microstructure,mechanical properties,and tribological properties of iron-based bearing materials were investigated.The results show that the tribological properties of iron-based bearing materials added with FeS are improved,but the interface bonding between FeS and iron-based materials is poor,and it is easy to agglomerate and fall off,which reduces the mechanical properties of iron-based materials and is not conducive to the improvement of anti-friction and wear resistance of the materials.FeS surface modification enhances the interfacial bonding between FeS and matrix,and the density and hardness of the materials are improved.When the 8%nickel-plated FeS(mass fraction)is added,the mechanical properties of the prepared iron-based bearing materials are optimal.Under the dry friction conditions,with the increase of load,the friction coefficient of the iron-based bearing materials containing nickel-plated FeS decreases slightly,the wear amount increases relatively slowly,and the wear surface is enriched with FeS.There are only slight furrows,the transfer film on the surface of the dual parts is highly covered,and the continuity is good.The materials show the good antifriction and wear resistance.