El ladrillo de carburo de silicio es un material refractario fabricado con SiC como materia prima principal. Dureza Mohs 9. Es más estable para la escoria ácida. Contiene SiC 72% ~ 99%. Se divide en ladrillos de carburo de silicio aglomerados con arcilla, aglomerados con Si3N4, aglomerados con Sialon, aglomerados con β-SiC, aglomerados con Si2ON2 y recristalizados.Generalmente, se utiliza carburo de silicio negro (contenido de SiC superior a 96%) como materia prima, y se añade un aglutinante (o ningún aglutinante), y se prepara mediante los procesos de dosificación, mezcla, moldeo y cocción. Las principales variedades son los ladrillos de carburo de silicio con aglomerante de óxido, los ladrillos de carburo de silicio con aglomerante de carbono, los ladrillos de carburo de silicio con aglomerante de nitruro, los ladrillos de carburo de silicio con aglomerante propio, los ladrillos de carburo de silicio recristalizado y los ladrillos de carburo de semisilicio. Es un material refractario de alto rendimiento.
| Artículo/Grado | GM1650 | GM1600 | GM1550 |
|---|---|---|---|
| ω (Al2O3) ≥/% | 65 | 63 | 60 |
| Densidad aparente ≥/(g/cm³) | 2.65 | 2.60 | 2.55 |
| Porosidad aparente ≤/% | 17 | 17 | 19 |
| Resistencia al aplastamiento en frío ≥/MPa | 85 | 90 | 90 |
| 0,2MPa Subcarga de refractariedad T0.6 ≥/℃ | 1650 | 1600 | 1550 |
| Resistencias al choque térmico (1100℃, refrigeración por agua) ≥/veces | 10 | 10 | 12 |
| Resistencia a la abrasión a temperatura ambiente ≥/cm3 | 5 | ||
| Expansión térmica/% | / | ||
1.High Temperature Stability
2.Excellent Fire Resistance
3.High Strength and Wear Resistance
4.Excellent Thermal Conductivity
5.Good Thermal Shock Stability
Se utiliza principalmente para fabricar retortas metalúrgicas no ferrosas, moldes de fundición de aluminio, revestimientos de hornos eléctricos, revestimientos de celdas electrolíticas de aluminio, muebles cerámicos para hornos e intercambiadores de calor, 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.