Silicon Carbide Development Background And Trend

In recent years, with the increase of the country's requirements for the atmospheric environment, it has become a consensus to strictly limit the pollution emissions of industrial enterprises, and the smelting of cast iron has become a trend from cupola to induction furnace smelting. With the widespread promotion of electric furnace smelting, there are two kinds of non-metallic materials - silicon carbide and recarburizer, which are also increasing in the application of cast iron smelting. The overheating temperature of electric furnace smelting is significantly lower than that of cupola furnace, and the metallurgical conditions are also poorer than cupola furnace, especially the tendency of white mouth and shrinkage are higher than those of cupola smelting. In order to improve the metallurgical quality of electric furnace smelting, reduce the heredity of pig iron, and improve the mechanical properties of castings, the application of non-metallic materials silicon carbide and recarburizers has become an inevitable trend, especially in the production of high-quality iron castings in electric furnace smelting. It is very important. In the foundry industry, the strong reducing properties of C and Si elements in silicon carbide are mainly used as silicon enhancers and deoxidizers for foundry metallurgy smelting. When the induction furnace is used to smelt cast iron and the proportion of scrap steel is used in the charge, SiC can be used as a reducing agent and a silicon increasing agent to purify the molten iron and supplement the silicon element. With the promotion of electric furnace smelting and production of castings in China, the use of silicon carbide is also increasing year by year.