Mainly used for making non-ferrous metallurgical retorts, aluminum casting molds, electric furnace linings, aluminum electrolytic cell linings, ceramic kiln furniture and heat exchangers, etc.
Silicon carbide brick is a refractory material made of SiC as the main raw material. Mohs hardness 9. It is more stable for acidic slag. Containing SiC 72% ~ 99%. Divided into clay bonded, Si3N4 bonded, Sialon bonded, β-SiC bonded, Si2ON2 bonded and recrystallized silicon carbide bricks.Generally, black silicon carbide (SiC content of more than 96%) is used as raw material, and a binder (or no binder) is added, and it is prepared through the processes of batching, mixing, molding and firing. The main crystal phase is silicon carbide.The main varieties are oxide-bonded silicon carbide bricks, carbon-bonded silicon carbide bricks, nitride-bonded silicon carbide bricks, self-bonded silicon carbide bricks, recrystallized silicon carbide bricks and semi-silicon carbide bricks.It has the characteristics of good wear resistance, corrosion resistance, high temperature strength, good thermal shock stability, high thermal conductivity, and small thermal expansion coefficient. It is a high-performance refractory material.
| Item/Grade | GM1650 | GM1600 | GM1550 |
|---|---|---|---|
| ω (Al2O3) ≥/% | 65 | 63 | 60 |
| Bulk Density ≥/(g/cm³) | 2.65 | 2.60 | 2.55 |
| Apparent Porosity ≤/% | 17 | 17 | 19 |
| Cold Crushing Strength ≥/MPa | 85 | 90 | 90 |
| 0.2MPa Refractoriness Underload T0.6 ≥/℃ | 1650 | 1600 | 1550 |
| Thermal Shock Resistances (1100℃, Water Cooling) ≥/times | 10 | 10 | 12 |
| Resistance to Abrasion at Ambient Temperature ≥/cm3 | 5 | ||
| Thermal Expansion/% | / | ||
Silicon carbide bricks can withstand extremely high temperatures, usually above 1500°C, even as high as 1800°C. So it has a wide range of applications in high temperature industrial fields, such as metallurgy, chemical industry, glass and so on.
Silicon carbide bricks have excellent fire resistance and can resist chemical corrosion and high temperature erosion. It excels in acidic and alkaline environments and is less susceptible to attack by molten metal and glass.
Silicon carbide bricks have extremely high hardness and wear resistance, and can be used for a long time without wear and tear under harsh working environments such as high temperature and high pressure.
The thermal conductivity of silicon carbide bricks is the highest among refractory materials, and the thermal conductivity of silicon carbide bricks is the highest among refractory materials, which can quickly transfer heat to the entire structure, improving thermal efficiency and energy saving effect.
Silicon carbide bricks have a low thermal expansion coefficient and good thermal shock stability, can withstand thermal stress caused by rapid temperature changes, and reduce the risk of thermal shock damage.
Silicon carbide bricks are often used in metallurgical steel cylinder lining, nozzle, plug, blast furnace bottom and bosh, and heating furnace without water-cooled slide rails. It is able to withstand extremely high temperatures and chemical attack while providing excellent thermal conductivity to ensure efficient metallurgical processes.
In the chemical industry, silicon carbide is used in oil and gas generators and organic waste combustion furnaces. Its corrosion resistance and stability allow it to withstand acidic, alkaline and high temperature environments, effectively protecting equipment from chemical substances.
Silicon carbide bricks are used as refractory lining materials for glass melting furnaces, which can withstand the erosion of high-temperature glass liquid and continuous thermal cycles, ensuring stable and efficient glass production.
In the power industry, silicon carbide bricks are widely used in high-temperature equipment such as coal-fired boilers, power station boilers and incinerators. It can withstand high temperature and thermal stress, while providing good thermal conductivity to protect equipment from high temperature combustion gases and slag.
Silicon carbide bricks are used in non-ferrous metal smelting stills, distillation tower trays, side walls of electrolytic cells, and melting metal crucibles.
High-tech ceramic kiln furniture aluminum electrolytic cell lining, molten aluminum conduit and ceramic kiln furniture, large and medium-sized blast furnace lower body, furnace waist and bosh, aluminum refining furnace lining, zinc distillation tank lining, etc.
Clay-bonded silicon carbide bricks are refractory products fired with silicon carbide as the main raw material and clay as the binder. It is characterized by high thermal conductivity, small thermal expansion coefficient, good thermal shock resistance and wear resistance, and is the earliest developed type of silicon carbide brick.
This product is used as kiln furniture for ceramic kiln (shelf board, bracket, sagger, etc.), muffle cover for muffle furnace, lining brick for aluminum refining furnace, retort tank for zinc distillation furnace, cooler for cement rotary kiln, etc.
Silicon nitride bonded silicon carbide brick is a refractory product made of SiC and Si powder and fired by nitriding. It is characterized by Si3N4 as the binding phase. Si3N4 exists between SiC grains in the form of acicular or fibrous crystals, and is an important new refractory material.
Silicon nitride combined with silicon carbide bricks are mainly used as the inner lining of the lower part of the blast furnace body, which is more than double the service life of traditional refractory materials. In addition, it can be used as the lining of the aluminum reduction electrolytic cell and ceramic kiln furniture, which has energy saving, improved service life, and It has the advantages of polluting the environment, and can also be used as a brick for the water-cooled pipe sleeve of the tuyere of a blast furnace.