Article Navigation
- Introduction to Corundum Mullite Bricks
- Classification & Technical Specifications
- Key Performance Advantages
- Industrial Applications
- Kerui’s Corundum-Mullite Brick Innovations
1. Introduction to Corundum Mullite Fire Bricks
Corundum mullite fire bricks are high-alumina refractory materials composed of corundum (α-Al₂O₃) and mullite (3Al₂O₃·2SiO₂) phases. These bricks exhibit exceptional thermal stability (up to 1,790°C), mechanical strength, and resistance to chemical erosion, making them indispensable in extreme-temperature industrial environments.
2. Classification & Technical Specifications
Kerui’s corundum-mullite bricks are categorized by Al₂O₃ content and microstructure:
| Grade | Al₂O₃ Content | Key Properties | Applications |
|---|---|---|---|
| GMZ-75 | ≥75% | Density ≥2.60 g/cm³, CCS ≥80 MPa | Glass kilns, chemical reactors |
| GMZ-85 | ≥85% | Thermal shock resistance >10 cycles (1,100°C water cooling) | Blast furnaces, cement rotary kilns |
| GMZ-88 | ≥88% | RUL ≥1,700°C, porosity ≤15% | High-temperature gasifiers, steel ladles |
Typical physical properties of Kerui’s products include:
- Cold Crushing Strength (CCS): 80–340 MPa.
- Thermal Conductivity: 1.5–2.5 W/m·K.
- Refractoriness Under Load (RUL): 1,650–1,700°C.
3. Key Performance Advantages
3.1 Thermal Stability
- High RUL: Withstands sustained loads at 1,700°C, ideal for direct flame exposure zones.
- Low Thermal Expansion: Linear change ≤0.2% after 1,500°C × 2h.
3.2 Chemical Resistance
- Acid/Alkali Resistance: Stable in pH 2–12 environments due to inert mullite-corundum matrix.
- Reduction Atmosphere Stability: Resists H₂, CO, and other reducing gases.
3.3 Mechanical Durability
- Abrasion Resistance: CCS ≥100 MPa ensures longevity in high-velocity particle flows.
- Thermal Shock Resistance: >30 cycles (1,100°C water quenching) for cyclic heating applications.
4. Industrial Applications
4.1 Metallurgy
- Blast Furnaces: Lining for hearths and stoves due to high RUL and slag resistance.
- Steel Ladles: Withstand molten metal erosion (1,600°C+) in teeming zones.
4.2 Petrochemical
- Cracking Furnaces: Resists alkali vapor (K/Na) and sulfur compounds in ethylene production.
4.3 Glass Manufacturing
- Glass Tank Regenerators: Low porosity minimizes glass infiltration.
4.4 Cement Industry
- Rotary Kiln Transition Zones: Combines thermal shock resistance with clinker liquid phase tolerance.
5. Kerui’s Corundum-Mullite Brick Innovations
As a certified ISO 9001 manufacturer with 20+ years of expertise, Kerui Refractory delivers cutting-edge solutions:
5.1 Proprietary Technologies
- 3D-Reinforced Microstructure: Enhanced thermal shock resistance via zirconia doping (ZrO₂ 5–8%).
- Eco-Friendly Formulations: Chromium-free compositions meeting EU environmental standards.
5.2 Quality Assurance
- Rigorous Testing: Every batch undergoes XRF analysis and ASTM-standard thermal cycling tests.
- Customization: Tailored brick geometries (arc, skew, checker) for complex kiln profiles.
5.3 Global Impact
- Certifications: Compliant with GB175-2007, ASTM C133, and EN standards.
- Client Portfolio: Trusted by LafargeHolcim, CNBM, and global cement/steel giants.
Kerui’s corundum mullite bricks redefine durability in extreme environments. With 15,000-ton annual capacity and a 36-member R&D team, we ensure optimal performance for your high-temperature processes.
Data sourced from Kerui technical datasheets and industry applications. Actual performance may vary based on operational conditions.
