Silicon carbide material

What are the applications of silicon carbide as refractories?
Silicon carbide refractories have special properties, which determines that they can be used in different conditions and fields. It is mainly used in the following fields:
1. Application of silicon carbide as refractories in ferrous metallurgy and powder metallurgy
2. Application of silicon carbide in ceramic and enamel industry
3. Application of silicon carbide in chemical industry
4. Application of silicon carbide in non ferrous metallurgy industry
Due to its high thermal conductivity, silicon carbide refractories are widely used in manufacturing muffle furnace, heating furnace bottom and heat exchanger, electric couple sleeve and other silicon carbide products, which can also be used in many indirect heating furnace structures, such as vertical fire horizontal rectifier irrigation, etc.
In a wide range of temperature, the mechanical strength and wear resistance of silicon carbide refractories are very high, so they can be used to make wear-resistant mechanical wear parts, such as: lining of cyclones, dust collectors, pipes, furnace bottom, etc.

Phase composition and true specific gravity of SiC refractories
In addition to the chemical composition of silicon carbide, there are also phase composition and true specific gravity in the performance of silicon carbide refractories. The following is a brief introduction to the phase composition and true specific gravity of lower silicon carbide refractories.
The true specific gravity of SiC material is an important index of its characteristics, because it can reflect its phase composition and is an addition index.
There are basically two phases in the silicon carbide products made of 100% silicon carbide. It is mainly composed of silicon carbide with a true specific gravity of 3.21 and some silicon dioxide (usually cristobalite) with a true specific gravity of 2.32, wherein silicon dioxide is formed by oxidation of silicon carbide.
Therefore, the true specific gravity of the sintered silicon carbide refractories made of 100% silicon carbide is an indirect indicator of the oxidation degree of silicon carbide products in the firing process, because the same oxidation occurs in use, so the true specific gravity after use is an indicator of the corrosion resistance of such products. Since the true specific gravity represents the oxidation degree of SiC products, it can indirectly represent the thermal stability of products.

Thermal conductivity and thermal capacity of silicon carbide
The thermal conductivity and thermal capacity of silicon carbide have an indirect impact on its other properties, such as the permeability of silicon carbide, and to a large extent determine the thermal stability of silicon carbide products.
1 thermal conductivity
The thermal conductivity of compact silicon carbide decreases with the increase of temperature, but that of light silicon carbide increases with the increase of temperature.
2 heat capacity
According to the different composition, the thermal capacity of various silicon carbide refractories changes little, and its value increases with the increase of temperature.
Performance summary of SiC material
Why silicon carbide materials are loved by all walks of life is not only because the generated silicon carbide products are applied to all industries, but also because of the performance of silicon carbide materials. So what are the properties of silicon carbide? There are mainly the following:
1. Chemical composition of silicon carbide
2. Phase composition and true specific gravity of silicon carbide
3. Permeability of SiC
4. Thermal conductivity and capacity of SiC
5. Oxidation degree of silicon carbide