Study on Friction and Wear Characteristics and Structure of Compound Layer from Combined Treatment of Ion Nitrocarburizing-Ion Sulphurizing of CrMoCu Alloy Cast Iron

CrMoCu Alloy Cast Iron is a kind of alloy cast iron thatis usually used to manufacture the engine cylinder.The engine cylinder often abates because of scuffingand wear.In order to reduce scuffing and wear,manysteps have been adopted in the practical applications.The first common way is to apply iron nitrating on thewall of the cylinder to form the ion nitride layer.Thehardness of ion nitride layer is so high that the ionnitride layer can improve evidently the wear-resistanceand scuffmg-resis…

Study on Friction and Wear Characteristics and Structure of Compound Layer from Combined Treatment of Ion Nitrocarburizing-Ion Sulphurizing of CrMoCu Alloy Cast Iron

The technics of combined treatment of ion nitrocarburizing-ion sulphurizing of CrMoCu alloy cast iron has been investigated and the compound layer with nitrocarbonide and sulphide has been made on the surface of CrMoCu alloy cast iron. The compound layer is composed of sulfide surface layer and the nitrocarbonide hypo-surface layer and its diffusing layer. The size of sulfide globular grains distributing equably on the surface is in nano-rnicron-scale, and the phase structure of the compound layer is composed of FeS^ FeSi^ Fe2C and Fe3N. Under dry sliding condition, the friction-reducing of sulphurized surface is good, but its function time can't last very long. The nitrocarbonided+sulphurized surface can greatly improve the wear-resistance and the friction-reducing of CrMoCu alloy cast iron, and its integrated friction and wear properties are better than plain and sulphurized surfaces'.