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Characteristics and Application Range of Silicon Nitride Bonded Silicon Carbide Bricks

wallpapers Industry 2020-10-10
The characteristics of silicon nitride combined with silicon carbide bricks have not only the features of high density, high strength, good thermal shock stability, high load softening point, good thermal conductivity, and high resistance value, but also have excellent resistance to cryolite and fluoride Melting corrosion and oxidation resistance of aluminium, sodium fluoride and calcium fluoride. They are mainly used in building and sanitary ceramics, daily-use porcelain, electric porcelain, aluminium, copper, zinc, steelmaking and rolling, ironmaking, metal heat treatment, environmental protection and other fields.
 
The high-temperature flexural strength of silicon nitride combined with silicon carbide is 4-8 times that of ordinary refractory materials; the coefficient of thermal expansion is half that of high-aluminium refractory materials; the thermal conductivity is 7-8 times that of general refractory materials, and the strength increases with temperature When the temperature rises to 1400℃, the power begins to decrease; but when the temperature drops to 1500℃, the average temperature flexural strength index is still maintained. The thermal conductivity of the material gradually decreases with the increase of temperature. It has high density, high strength, It has the characteristics of good thermal shock stability, the high softening point under load, good thermal conductivity, high resistance value, etc., and has excellent resistance to melting corrosion and oxidation of cryolite, aluminium fluoride, sodium fluoride and calcium fluoride. Now its performance is described as follows:

1) Silicon nitride bonded silicon carbide bricks are challenging, with a Mohs hardness of about 9, which is a high-hardness material among non-metallic materials, and its hardness is second only to diamond.
2) The room temperature strength of the silicon nitride bonded silicon carbide brick is high, and it maintains almost the same power and hardness as room temperature at a high temperature of 1200-1400°C. With the use of different atmosphere, the highest safe use temperature can reach 1650 ~ 1750 ℃.
3) The coefficient of thermal expansion is small, the thermal conductivity is higher than that of silicon carbide and other bricks, and it is not easy to generate thermal stress. It has good thermal shock stability and long service life. High temperature creeps resistance, corrosion resistance, extreme cold and extreme heat resistance, oxidation resistance, easy to make bricks with high dimensional accuracy and meeting requirements.
 
At this stage, in the firing of ceramic products, most of the roller kiln is used to fire sanitary ceramics and wall and floor tiles, and the rollers of the roller kiln are made of silicon nitride combined with silicon carbide. The application of silicon nitride combined with silicon carbide rollers solves the problem of high firing temperature and heavy load, effectively reducing product energy consumption and improving product quality.


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Tag: Silicon Nitride