Mullite Bonded Corundum Bricks are high-performance alumina-based refractory bricks manufactured by combining high-purity fused corundum (Al₂O₃) with a mullite (3Al₂O₃·2SiO₂) bonding phase. This unique microstructure provides outstanding refractoriness, superior mechanical strength, excellent thermal shock resistance, and strong corrosion resistance against slags and molten materials.
As a professional refractory manufacturer with over 20 years of production experience, Xintai Refractory supplies Mullite Bonded Corundum Bricks tailored for demanding high-temperature industrial applications. These bricks are widely used in industries such as iron & steel, cement, ceramics, glass, and non-ferrous metallurgy where structural stability and long service life are critical.
Technical Specifications
| Property | Unit | Value |
|---|---|---|
| Al₂O₃ Content | % | ≥ 80 – 90 |
| Apparent Porosity | % | ≤ 18 |
| Bulk Density | g/cm³ | 2.8 – 3.1 |
| Cold Crushing Strength | MPa | ≥ 70 – 90 |
| Refractoriness Under Load | °C | ≥ 1700 |
| Thermal Shock Resistance | Cycles | ≥ 20 |
Key Features
- High Refractoriness: With an Al₂O₃ content typically ranging from 75% to 95%, Mullite Bonded Corundum Bricks can withstand extremely high operating temperatures, often above 1700°C.
- Excellent Thermal Shock Resistance: The mullite bonding phase improves resistance to rapid temperature changes, reducing the risk of cracking and spalling.
- Superior High-Temperature Strength: These bricks maintain strong structural integrity under heavy loads at elevated temperatures, making them ideal for load-bearing zones.
- Outstanding Slag and Chemical Resistance: High corundum content provides excellent resistance to acidic and neutral slags, alkali vapors, and chemical erosion.
- Low Porosity & High Density: Controlled production processes ensure low apparent porosity and high bulk density, enhancing durability and lifespan.
- Customizable Specifications: Available in standard shapes (straight, wedge, arch) and custom-designed shapes according to furnace drawings.
Typical Applications
Mullite Bonded Corundum Bricks are widely used in high-temperature industrial furnaces and kilns, including:
Regenerator checkers in glass melting furnaces.
Sidewalls, crowns, and other high-temperature zones exposed to severe thermal stress.
High-temperature structural components requiring both refractoriness and thermal shock resistance.
Production Details
At Xintai Refractory, we follow strict quality control standards throughout the manufacturing process. Mullite Bonded Corundum Bricks are manufactured from carefully selected raw materials including high-purity alumina and synthetic mullite. The production process involves:
Raw Material Preparation – Precision mixing of alumina, mullite, and binding agents.
Forming – Press forming or vibration forming to ensure uniform density.
High-Temperature Sintering – Firing at over 1700°C to develop a stable corundum-mullite crystal structure.
Quality Inspection – Each batch undergoes strict testing for density, porosity, strength, and dimensional accuracy.
Packing and Shipping Details
Packing: Bricks are securely packed on fumigated wooden pallets with protective wrapping to prevent breakage during transit.
Shipping: Global delivery available by sea, land, or air freight depending on customer needs. Standard lead times typically range from 15–30 days after order confirmation. Customized packaging and urgent shipments can be arranged upon request.
Frequently Asked Questions (FAQ)
Q1: Are Mullite Bonded Corundum Bricks suitable for steel ladles?
Yes. Due to their high-temperature strength and slag resistance, they are suitable for impact zones and high-wear areas in ladles. However, final selection depends on slag chemistry and working temperature.
Q2: What is the difference between Mullite Bonded Corundum Bricks and High Alumina Bricks?
Mullite Bonded Corundum Bricks contain a controlled mullite bonding phase and higher corundum content, providing better thermal shock resistance and higher mechanical strength compared to conventional high alumina bricks.
Q3. Can you produce according to our drawings?
Yes. We support OEM and custom-shaped production based on customer technical drawings or furnace design requirements.
Q4: Do you provide sample bricks for testing?
Yes. Samples can be provided for laboratory testing before bulk order confirmation.
Q5: Do you provide installation guidance?
Yes, our technical team can provide on-site or remote installation guidance to ensure proper lining performance.
