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What are carbon-containing refractories

wallpapers Industry 2020-12-30
Carbon-containing refractories refer to refractories mainly composed of carbides. They are neutral refractory materials and are divided into two categories: carbonaceous products, graphite clay products and carbonized Cassia products.
 
Characteristics of carbon-containing refractories
Carbon-containing refractories have high refractoriness (the melting temperature of pure carbon is 3500°C, and actually begins to sublime at 3000°C. Silicon carbide will decompose above 2200°C), good thermal and electrical conductivity, and load-deformation Excellent temperature and high-temperature strength, slag resistance and thermal shock resistance are better than other refractory materials. However, this product has the disadvantage of being easily oxidized.
 
Types of carbon-containing refractories
The carbon product is a product that uses coke, graphite or heat-treated anthracite as the raw material and uses carbon-containing organic materials as the binder as the main component. These products include carbon bricks with coke or anthracite as the main component, as well as graphitized artificial graphite and semi-graphite carbon bricks. Carbon products have good heat resistance, corrosion resistance, high-temperature strength and high-temperature thermal conductivity and are currently mainly used in blast furnaces.
 
Graphite clay products are refractory materials made of natural graphite as raw material and clay as a binder. It has good thermal conductivity, high-temperature resistance, does not interact with the metal melt, and has a low thermal expansion rate. These products include graphite clay crucibles, distillation tanks, cast steel plug bricks, nozzle bricks and steel barrel lining bricks. Among them, graphite clay crucibles for steelmaking and non-ferrous metal smelting have the highest output and are most widely used.
 
Silicon carbide products are advanced refractory materials produced from silicon carbide (SiC). Its wear resistance and corrosion resistance are good, high-temperature strength, high thermal conductivity, low thermal expansion coefficient, and good thermal shock resistance. In recent years, its application areas have continued to expand. Silicon carbide products are currently used in molten steel smelting, for ladle linings, nozzles, plugs, blast furnace bottoms and hearths, tapping channels, converters and electric furnace taps, and heating furnaces without water cooling slides. In the smelting of non-ferrous metals (zinc, copper, aluminum), it is widely used in stills, rectification tower trays, sidewalls of electrolytic cells, molten metal pipes, pumps and molten metal crucibles.

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