Overview of carbon containing refractories
Carbon containing refractories are refractories made of carbon containing refractory materials or carbon compounds, or compounded with other refractory materials. The main components of the refractories contain various forms of carbon. According to the composition of carbonaceous raw materials and the mineral composition of products, carbonaceous refractories can be divided into four categories: Clay graphite products; carbonaceous products, such as carbon brick, artificial graphite, semi graphite brick, etc.; silicon carbide products, such as oxide bonded silica brick, nitride bonded silicon carbide brick, self-adhesive silicon carbide brick, siliconizing reaction sintering silicon carbide brick and semi silicon carbide brick; and carbon composite Products, such as magnesium carbon brick, magnesium calcium carbon brick, aluminum carbon brick, aluminum silicon carbide brick and aluminum magnesium carbon brick, etc.
The origin of carbon containing refractory products can be traced back to 1769, bonning (G. Bonning) obtained special permission for clay graphite crucibles. In 1827, Dixon established a clay graphite crucible factory in the United States. In 1875, clay graphite crucibles were used to melt various metals, such as gold, silver, brass and iron. In 1866, the German iron box ferroalloy industry began to use carbon bricks. In 1903, France and Belgium used silicon carbide products as zinc distillers and retorts. In 1970, magnesia and graphite were used as raw materials to produce magnesia carbon brick in Japan. In 1951, clay graphite Saitou brick was made and successfully used in 100 tons of steel drums; in 1953, clay bonded silica brick was made and used in zinc distillation furnace; in 1958, industrial carbon brick was used in blast furnace bottom and hearth; in 1979, magnesium carbon brick was produced and used in electric furnace wall.
Carbon containing refractories have high fire resistance, good chemical stability, high load deformation temperature and high temperature strength, good thermal conductivity, low linear expansion rate, good slag resistance and thermal shock stability. However, they are easy to oxidize, which can be improved by adding antioxidants or other ways. It has been widely used in such fields as blast furnace, electric furnace and so on. Silicon carbide products should be widely used in other industrial kilns such as nonferrous metals and ceramics.