High-Quality Corundum-Mullite Shaped Brick from China Suppliers and Factory for Industrial Applications
Composition and Classification
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: GMZ-80, GMZ-85.
Features
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.
Application
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.
Chemical & Physical Indicator
| 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 | |
