Alloy and Metallic Coatings for High Temperature Applications

摘要

Casting form materials used in both ferrous and nonferrous alloy continuous casting must be hard, wear resistant and very good thermal conductivity. Our researches had in view to replace Ag with other metals (Cr, Zr) with a view to reducing costs of continuous casting and obtaining cheaper materials of high durability and thermal properties close to those of the Cu-Ag alloy. Analyzing the influence of small Cr or Cr-Zr additions at room temperature as compared with the Cu-Ag alloy, we found that, the refractoriness and the mechanical properties are improved which influence, to a certain extend, the thermal conductivity or the thermally untreated materials. In order to improve mould durability as well as to get high-quality machine ports, the metallic moulds must be covered with nonmetallic, metallic and metaloceramic coatings. Experimental researches have tried to obtain thicker (about 300μm) and hard layers.