：建立了碳钢渗硫表面和非渗硫表面的多球凸峰面接触模型，模型中，凸峰高度按高斯函数分布．用塑性流线

理论分析了渗硫层的摩擦系数．计算结果表明：摩擦系数随载荷的增加而增加；相同粗糙度下，磨削加工的摩擦系

数比车削加工的摩擦系数大；摩擦系数随着渗层厚度的增大而增大．从减小摩擦系数的角度来考虑，渗硫层并非

越厚越好．-the multi-asperity sphere-shape model for surface contact between sulphurized layer and unsulphurized

layer is established．in which the height of sphere-shape asperities follows the Gaussian distribution．1he

frictional coeficients of sulphurized layers are analyzed by using plastic flown line theory．1he results show that

the frictional coeficient increases with the load．the frictional coeficient of ground surface is higher than that

of tumed surface in case of the same roughness．1he thicker the sulphuri[ed layer is．the higher the frictional

coeficient is．From the viewpoint of reducing frictional coeficient，the thickness of sulphurized layer should

be smaller．