含硫添加剂润滑下CrMoCu合金铸铁渗硫层的摩擦磨损性能研究

Friction and Wear of Sulphurized Layer of CrMoCu Alloy Cast Iron with Lubrication of Sulphur-containing Additive

采用低温离子渗硫技术在CrMoCu合金铸铁表面形成厚度约5μm渗硫层,渗硫层表面分布均匀,其相组成主要为FeS.在液体石蜡及含硫添加剂液体石蜡润滑下,对未渗硫及渗硫表面进行摩擦磨损性能对比试验,并对其磨损表面形貌和成分进行分析.结果表明,在高速重载条件下,CrMoCu合金铸铁经表面渗硫后其摩擦系数明显降低,同时降低了材料的粘着倾向,提高了材料的抗擦伤性能,在渗硫层与含硫添加剂协同作用下生成钼的化合物、磷酸盐及硫化物等化学反应膜,使CrMoCu合金铸铁表面具有更加优良的减摩耐磨性能.

Sulphurized layer was produced on the surface of CrMoCu alloy cast iron by means of low temperature ion sulphurization process with thickness of about 5μm. The sulfide globular grains distribute evently on the surface, and their size is in micron-scale. The phase structure of the sulphurized layer is mainly composed of FeS. Under the high speed and heavier loading condition, the sulphurized surface exhibited lower friction coefficient than plain surface evidently, and it greatly reduced the tendency of adhesion of the material and it improved the scuffing-resistance of the material. Under the synergistic effect between sulphurized layer and with sulphur additive, CrMoCu alloy cast iron exhibited much more excellent friction-reducing and wear-resistance due to chemical reaction films including molybdenum compound, phosphate and sulphide.