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China Corundum-Mullite Shaped Brick Suppliers - High-Quality Refractory Factory Products
Composition and Classification
Main Components
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%.
Classification
According to the content of the main component Al₂O₃, it can be divided into four grades: GMZ-80, GMZ-85.
Features
1. Good Thermal Resistance
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.
2. Strong Thermal Stability
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.
3. High Chemical Stability
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.
4. High Mechanical Strength
It has a high compressive strength at room temperature, which can reach 70-160MPa, and is resistant to pressure, wear and impact.
Application
1. Iron and Steel Metallurgy Industry
It is used for the linings of high-temperature equipment such as blast furnaces, hot blast stoves, ladles and tundishes.
2. Petroleum and Chemical Industry
It is used as a refractory material in high-temperature reaction furnaces such as oil refining and chemical industries.
3. Power Industry
It is used for the refractory linings of high-temperature equipment such as boilers and steam turbines.
4. Glass and Ceramics Industry
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) °C | 1650 | 1680 | |
| Thermal Shock Resistances | Good | excellent | |
Frequently Asked Questions
What are the primary raw materials of corundum-mullite bricks?
They are mainly manufactured from corundum and mullite as the primary raw materials, with appropriate additions of alumina, silica ultrafine powder, and select additives.
What is the typical Al₂O₃ content in these bricks?
The Al₂O₃ content in corundum-mullite bricks typically ranges between 80% and 90% depending on the specific grade (such as GMZ-80 and GMZ-85).
What is the maximum service temperature for corundum-mullite bricks?
These bricks exhibit high refractoriness and are suitable for long-term operations at temperatures exceeding 1700°C.
How well do these bricks perform under chemical exposure?
They offer high chemical stability with strong resistance to corrosive media like acids and alkalis, as well as gases including oxygen, hydrogen, and carbon monoxide.
Which industries commonly use corundum-mullite bricks?
They are extensively used in high-temperature equipment within the iron and steel metallurgy, petroleum and chemical, power, and glass and ceramics industries.