| 摘要 |
PURPOSE:To obtain a sliding member having excellent resistance to abrasion and scuffing with less abrasion of the mated material by making the surface layer into a structure wherein graphite is dispersed in a high-hardness chilled structure in a titled member consisting of a cast iron base material and the surface layer. CONSTITUTION:The surface of a cast iron base material whose surface is ground is covered with an element and/or alloy powder for promoting graphitization such as C, Si, etc. having <=100 mesh in the form of powder or paste. The covered surface layer is heated and melted by a source of heat. In this case, a high-density energy source such as a laser beam, etc. which is capable of heating rapidly only the covered surface layer without heating the whole surface of the cast iron base material and is also capable of cooling rapidly the molten alloy and the base material is appropriately used as the heat source. The surface of the cast iron base material is extremely rapidly heated in this way, made into a hyper-eutectic composition by the action of the element for promoting graphitization, and then cooled rapidly to crystallize out graphite in the chilled structure. The desired sliding member made of cast iron can be obtained in this way. |
