Mullite Bricks&Sillimanite Bricks
Mullite brick is a high-performance high-alumina refractory brick with mullite (3Al₂O₃·2SiO₂) as the main crystal phase, the only stable high-temperature crystal phase material in the Al₂O₃-SiO₂ system. It features extremely strong high-temperature rigidity (no deformation above 1600℃ for long-term use, ultra-low creep), excellent thermal shock performance (low thermal expansion, anti-cracking/peeling), outstanding corrosion resistance (resistant to acidic/neutral slag scouring and melt corrosion, little pollution), high room-temperature compressive strength and moderate apparent porosity, with complete specifications and flexible customization, widely applicable to various high-temperature industries, making it the preferred refractory material for the core lining of various high-temperature kilns.
Product Classification:
1. Sintered Mullite Brick: Made from bauxite and silica (1600-1700℃ sintering), Al₂O₃ 65%-72%. Cost-effective, mature, suitable for medium-high temperature conventional conditions; available in standard/special-shaped bricks, widely used in building materials and metallurgy kilns.
2. Fused Mullite Brick: Electric-fused (above 1900℃), coarser crystal, denser structure. Al₂O₃ 70%-75%, superior thermal shock/corrosion resistance, ultra-low creep. Suitable for core high-temperature (above 1650℃) strong-scouring conditions (glass melting furnaces, high-end metallurgy).
3. Zircon Mullite Brick: Mullite + zircon (ZrSiO₄) additive (1650-1720℃ sintering). Al₂O₃ 68%-75%, ZrO₂ 8%-15%, stronger erosion resistance. Used in key glass melting furnace parts and high-erosion non-ferrous smelting furnaces.
4. High-Purity Mullite Brick: High-purity alumina/silica, Fe₂O₃≤0.2%, Al₂O₃ 72%-78%, refractoriness above 1850℃. Pollution-free, excellent high-temperature stability, for high-purity scenarios (precision metallurgy, electronic ceramic kilns).
5. Mullite Prefabricated Parts: Customized by kiln size/shape, no on-site cutting, high construction efficiency, good sealing. Suitable for irregular kiln sections (hot blast stoves, cracking furnaces), reducing brick falling risk.
Sillimanite brick is made from natural sillimanite (Al₂SiO₅, theoretical Al₂O₃ content 62.9%) through batching, forming and high-temperature sintering. Its core characteristic is that sillimanite undergoes mullitization phase transformation at high temperature (1300-1500℃), accompanied by moderate volume expansion (2%-3%), which can offset the sintering shrinkage of the brick body, making the brick body denser and better sealed. Its refractoriness is 1770-1830℃, which is especially suitable for medium and high-temperature working conditions with large temperature fluctuations and chemical corrosion, with outstanding cost performance.
Product Classification:
1. Ordinary Sillimanite Brick: Natural sillimanite (Al₂O₃ 60%-62%) + bauxite/clay, conventional sintering. Moderate porosity, good thermal shock, low cost; for conventional high-temp, frequent temp fluctuation (blast furnace throat, ceramic kiln furniture).
2. High-Purity Sillimanite Brick: High-purity natural sillimanite (Al₂O₃ 62%-65%), Fe₂O₃≤0.3%, 1580-1650℃ sintering. Denser, better alkali/corrosion resistance; for slight chemical corrosion (glass kilns, non-ferrous smelting furnaces).
3. Sillimanite-Mullite Composite Brick: Sillimanite + mullite, phase transformation self-densification + high-temp stability. Al₂O₃ 63%-68%, balances thermal shock/creep resistance; for large temp fluctuation, high-temp load-bearing (blast furnace bottom, glass flow channel).
Sillimanite brick products: Channel brick, flow trough, rotary pipe, feed basin, orifice ring, stirring paddle, punch, feed cylinder, fire block slag brick, damper block, arch brick, feed basin cover, through-hole brick, burner brick, beam, cover brick and other varieties and specifications.
Core Advantages:
1. Phase Transformation Self-Densification: High-temperature mullitization expansion offsets shrinkage, ensuring high compactness and good sealing.
2. Balanced Thermal Stability: Low thermal expansion, excellent thermal shock/abrasion resistance, suitable for frequent temperature changes.
3. High Cost-Effectiveness: Natural sillimanite raw material, lower cost than mullite bricks, suitable for cost-sensitive scenarios.
4. Excellent Slag Resistance: Resistant to slag/glass liquid corrosion and high-temperature wear, not easy to peel off.
5. Natural & Eco-Friendly: No harmful impurities, little material pollution, suitable for eco-friendly kilns.
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Products
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Three Low Mullite
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Sintered Mullite
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Sillimanite Mullite
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Fused Mullite
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Index
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RBTM-47
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RBTM-65
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RBTM-70
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RBTM-75
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RBTA-60
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RBTA-65
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RBTFM-75
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Refractoriness(℃) ≥
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1790
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1790
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1790
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1790
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1790
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1790
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1810
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Bulk Density(g/cm3) ≥
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2.42
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2.45
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2.50
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2.60
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2.48
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2.5
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2.70
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Apparent Porosity(%) ≤
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12
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18
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18
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17
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18
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18
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16
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Cold Crushing Strength(MPa)
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60
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60
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70
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80
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70
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70
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90
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Permanent Linear Change(%)
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1400°×2h
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+0.1
-0.1
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1500°×2h
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+0.1
-0.4
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+0.1
-0.4
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+0.1
-0.4
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+1
-0.2
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±0.2
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±0.1
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Refractoriness Under Load@0.2MPa(℃) ≥
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1520
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1580
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1600
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1600
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1600
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1620
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1700
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Creep Rate@0.2MPa
1200°×2h(%) ≤
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0.1
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―
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―
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―
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―
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―
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―
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Al2O3(%) ≥
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47
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64
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68
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72
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60
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65
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75
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Fe2O3(%) ≤
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1.2
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0.8
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0.8
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0.7
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1.0
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0.8
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0.5
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Mullite Bricks:
1. Metallurgical Industry: Hot blast stove top, blast furnace shaft, ladle lining, non-ferrous metal smelting furnace;
2. Building Materials Industry: High-temperature zone of ceramic kiln, transition zone of cement rotary kiln, refractory tunnel kiln;
3. Glass Industry: Regenerator, channel, launder and working pool side wall of glass melting furnace;
4. Chemical Industry: Petrochemical cracking furnace, high-temperature calciner, catalyst roasting furnace;
5. High-End Field: Electronic ceramic kiln, precision metallurgical furnace (suitable for high-purity type).
Sillimanite Bricks:
1. Metallurgical Industry: Blast furnace bottom protection brick, furnace throat lining, iron outlet area, medium and low temperature zone of hot blast stove;
2. Glass Industry: Working pool side wall, flow channel, channel brick and regenerator checker brick of glass melting furnace;
3. Ceramic Industry: Firing zone of ceramic kiln, kiln furniture (saggar, shelf), tunnel kiln lining;
4. Chemical Industry: Non-ferrous metal smelting furnace lining, high-temperature roasting furnace, sulfuric acid roasting furnace;
5. Other Fields: High-temperature section of waste incinerator, cement kiln preheater lining (suitable for ordinary type).
Frequently Asked Questions
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