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Mullite Bricks with Excellent Thermal Shock Resistance from China Suppliers and Factory for High-Temperature Applications
Core Advantages
🔥 Exceptional High-Temperature Stability
With refractoriness up to 1790℃ and load softening temperature 1600–1700℃, they maintain structural integrity under extreme heat, ensuring long service life.
⚡ Superior Thermal Shock Resistance
Resisting cracking from rapid temperature changes, suitable for intermittent operation furnaces.
🛡️ Strong Corrosion & Wear Resistance
Resists most acid slags, chemical attack, and oxidation, with high cold crushing strength (70–260 MPa) for erosion-prone environments.
💡 Low Thermal Conductivity
Reduces heat loss, improving energy efficiency of industrial kilns while ensuring stable temperature distribution.
⚙️ Customizable Specifications
Available in sintered/fused cast types and various sizes, tailored to specific furnace structures and working conditions.
Product Parameters
| Item | Sintered Mullite Brick | ||
| Al₂O₃ % | ≥75–80 | ≥72–75 | ≥70 |
| Fe₂O₃ % | ≤1.2 | ≤1.2 | ≤2.0 |
| Bulk Density (g/cm³) | ≥2.70 | ≥2.65 | ≥2.65 |
| Apparent Porosity (%) | ≤18 | ≤19 | ≤20 |
| Cold Crushing Strength (MPa) | ≥90 | ≥90 | ≥70 |
| Refractoriness Under Load ℃ (0.2MPa, 0.6%) | ≥1650 | ≥1650 | ≥1530 |
| Creep Rate 0.2MPa (1400℃×50h) % | ≤0.8 | ≤0.8 | ≤0.8 |
Detailed Application Scenarios
1
Metallurgy Industry
◎ Applied in hot blast furnace roofs, blast furnace stacks and bottoms, torpedo tanker slag line areas, and hot air channel hanging parts. Resists iron liquid scouring and high-temperature furnace atmospheres, ensuring stable operation of metallurgical equipment.
2
Petrochemical Industry
◎ Suitable for slag gasification furnaces, synthetic ammonia conversion furnaces, carbon black reactors, and cracking furnace linings. Withstands chemical corrosion from reaction media and high-temperature creep, extending furnace service life.
3
Glass & Ceramic Industry
◎ Used in glass melting furnace regenerative chambers, clarification tank walls, ceramic tunnel kilns, roller kilns, and kiln furniture. Features low thermal conductivity and excellent thermal stability, adapting to continuous high-temperature working conditions.
4
Building Materials & Other Industries
◎ Ideal for rotary cement kilns, lime kiln inner linings, heat treatment furnaces, and resistance furnaces. Available as lightweight insulation bricks for backing linings and standard bricks for fire-facing surfaces, meeting diverse insulation and load-bearing needs.
5
Product Type
◎ Sintered Mullite Bricks: Cost-effective with balanced performance, suitable for general high-temperature kiln linings like ceramic kilns and hot blast stoves.
◎ Fused Cast Mullite Bricks: Higher purity and density, superior erosion resistance, ideal for harsh environments like glass kiln key parts and acid slag contact areas.
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Frequently Asked Questions
What is the maximum service temperature of mullite bricks?
Mullite bricks have a refractoriness of up to 1790℃ and a load softening temperature ranging from 1600℃ to 1700℃, making them suitable for extreme high-temperature industrial environments.
What is the difference between sintered and fused cast mullite bricks?
Sintered mullite bricks are cost-effective with balanced performance, ideal for general high-temperature kiln linings. Fused cast mullite bricks offer higher purity and density with superior erosion resistance, best suited for harsh environments such as glass kiln key parts and acid slag contact areas.
Which industries are mullite bricks commonly used in?
Mullite bricks are widely used across metallurgy, petrochemical, glass & ceramics, building materials, cement, and heat treatment industries. They are applied in blast furnaces, glass melting furnaces, cracking furnace linings, rotary cement kilns, and many other high-temperature applications.
What is the cold crushing strength range of mullite bricks?
The cold crushing strength of mullite bricks ranges from 70 MPa to 260 MPa depending on the grade and Al₂O₃ content, providing excellent mechanical durability in erosion-prone environments.
Can mullite bricks be customized to specific dimensions and requirements?
Yes. Mullite bricks are available in both sintered and fused cast types across various sizes and specifications. They can be tailored to meet specific furnace structures, working conditions, and load-bearing or insulation requirements.
How do mullite bricks help improve energy efficiency?
Thanks to their low thermal conductivity, mullite bricks significantly reduce heat loss from industrial kilns and furnaces. This results in more stable temperature distribution and lower fuel consumption, improving the overall energy efficiency of thermal equipment.