Corundum-mullite brick
Category:
Description:
Sintered corundum firebrick
I. Main Product Types and Characteristics
(According to Al₂O₃ Content and Additive Classification)
- Standard type ( SG-95 Series)
- Al₂O₃ content: 94–96%
- Apparent porosity 14–16%
- Load softening point ≥ 1700℃
- Applicable temperature ≤ 1650℃
- Low-porosity type ( SD-98 Series)
- Closed-pore technology (porosity ≤ 12%)
- Outstanding high-temperature creep resistance.
- Creep rate at 1600℃ < 0.3%/50h
- Chromium corundum composite ( SCr-20 series)
- Cr₂O₃ addition amount: 15–20%
- Improved slag resistance 3 times
- Suitable for strongly reducing atmospheres.
- 2025 New Gradient-Structure Products
- Work area: 99% pure corundum layer (20 mm thick)
- Transition Layer: 95% corundum + silicon carbide
- Backing layer: Porous corundum structure
2. Modern Production Processes
- Raw Material Preprocessing System
- Using laser particle size separation ( (200–325 mesh, with a proportion ≥ 85%)
- Nano-coating modification technology (to enhance sintering activity)
- Intelligent Compression Molding
- Isostatic pressing pressure: 200-250MPa
- Digital twin simulation optimizes particle gradation.
- Oxy‑fuel tunnel kiln
- Firing temperature 1750–1800℃ (±5℃)
- Intelligent Temperature Control System ( Independent regulation in Zone 30)
- The firing cycle has been shortened to 36 hours (traditional 72 hours)
- Post‑processing technology
- Microwave-Assisted Sintering (Density Enhancement) 5%)
- Surface nanocoating (enhanced corrosion resistance) 40%)
III. Application Areas
Application Industry
|
Typical Equipment
|
Service life
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Energy-saving benefits
|
New energy batteries
|
Sintering Kiln for Ternary Materials
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18–24 month
|
Reduced power consumption 22% |
Electronic glass
|
High-alumina glass melting furnace
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5–7 year
|
Fuel savings 15% |
Chemical industry
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Ethylene glycol reactor
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10 Ten thousand hours
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Maintenance Cycle +50% |
Hydrogen Energy
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Hydrogen storage tank insulation layer
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-
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Thermal loss reduction 30% |
IV. Comparative Analysis of Performance Advantages
- Compared with traditional electrofused bricks
- Thermal shock resistance: 35 times vs. 15 times (water-cooled at 1100℃)
- Dimensional accuracy: ±0.3 mm vs ±1.2 mm
- Cost advantage: Low 40–50%
- Comparison with competing materials
- Thermal conductivity: 2.8 W/m·K (superior to silicon carbide bricks)
- Resist CO erosion: Weight gain of 0.5% vs. 2.1% (high-alumina bricks)
V. Physicochemical Indicators
1. Basic Performance: - Bulk density: 3.25–3.40 g/cm³ – Room‑temperature pressure resistance: ≥150MPa ( SD-98 Series)
2. High-Temperature Properties: - Flexural strength ( 1600℃ ): ≥25 MPa - Thermal expansion coefficient ( 1000℃ ): 0.68–0.72%
3. Special Indicators: - Alkali resistance ( K₂CO₃/1400℃ ): ≤1.2mm Penetration /100h- Microwave loss angle: tanδ ≤ 0.0015 ( 5G Frequency band)
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Corundum-mullite brick
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