High-Quality Corundum-Mullite Shaped Bricks from China Suppliers | Reliable Factory Manufacturing
Corundum-mullite bricks are mainly made of corundum and mullite as raw materials, with an appropriate amount of alumina, silica ultrafine powder and additives added. The content of Al₂O₃ is usually between 80% and 90%.
According to the content of the main component Al₂O₃, it can be divided into four grades, including GMZ-80 and GMZ-85.
It has a high refractoriness and can be used for a long time at temperatures above 1700°C. The initial temperature of load softening is between 1600°C and 1700°C.
It can withstand rapid changes in temperature, has good thermal shock resistance, and is resistant to extreme cold and heat, and is not easy to spall.
It has strong resistance to corrosive media such as acids and alkalis, as well as gases such as oxygen, hydrogen and carbon monoxide, and is not prone to chemical reactions.
It has a high compressive strength at room temperature, which can reach 70-160MPa, and is resistant to pressure, wear and impact.
It is used for the linings of high-temperature equipment such as blast furnaces, hot blast stoves, ladles and tundishes.
It is used as a refractory material in high-temperature reaction furnaces such as oil refining and chemical industries.
It is used for the refractory linings of high-temperature equipment such as boilers and steam turbines.
It is used in high-temperature equipment such as glass kilns and ceramic kilns.
| Item | DM-80 | DM-85 | |
|---|---|---|---|
| Chemical Composition% | Al2O3 % | 80 | 85 |
| SiO2 % | ≤19 | ≤14 | |
| Fe2O3 % | ≤ 0.3 | ≤ 0.2 | |
| Bulk Density (g/cm3) | 2.65 | 2.65 | |
| Apparent Porosity (%) | ≤ 17 | ≤ 16 | |
| Cold Crushing Strength (Mpa) | 115 | 120 | |
| 0.2Mpa Refractoriness Under Load (T0.6h) ℃ | 1650 | 1680 | |
| Thermal Shock Resistances | Good | excellent | |
Corundum-mullite bricks are mainly composed of corundum and mullite as raw materials, with added alumina, silica ultrafine powder, and additives. The Al₂O₃ content typically ranges between 80% and 90%.
These bricks exhibit outstanding thermal resistance, allowing for long-term use at high temperatures exceeding 1700°C, with a load softening start temperature between 1600°C and 1700°C.
DM-80 contains 80% Al₂O₃ and ≤19% SiO₂ with a cold crushing strength of 115 Mpa. DM-85 contains 85% Al₂O₃ and ≤14% SiO₂ with a higher cold crushing strength of 120 Mpa. DM-85 also offers superior thermal shock resistance and higher refractoriness under load (1680°C vs 1650°C).
They offer high chemical stability, providing excellent resistance against corrosive media like acids, alkalis, and gases (such as oxygen, hydrogen, and carbon monoxide). They also have high mechanical strength (70-160MPa) to withstand pressure, wear, and impact.
They are widely applied in the iron and steel metallurgy industry (blast furnaces, ladles), petroleum and chemical industry (reaction furnaces), power industry (boilers, steam turbines), and glass/ceramics industry (kilns).