Silimanite brick
Material: Sillimanite, mullite, calcined bauxite, flux-calcined stone Advantages: Low thermal expansion, excellent abrasion and corrosion resistance Category: Alumina-silicate refractories Al₂O₃-SiO₂
Application
Metallurgy, Cement, and Glass Industries; Renewable Energy, Semiconductor, and Aerospace Industries; Waste Incineration Furnace
Description
The manufacturing process utilizes the following raw materials: sillimanite, andalusite, zircon, mullite, alumina powder, and binding clay. Firing is conducted in a tunnel kiln at 1450–1500°C with a holding time of 10–12 hours, followed by natural cooling for 48–52 hours before extraction.
Specifications
| Item | RS-СК-65 | RS-СК-60 | RS-СК-55 |
| Al203% | ≥ 65 | ≥ 55 | ≥ 55 |
| SiO2% | ≤32 | ≤ 37 | ≤ 42 |
| Fe203% | ≤ 0.5 | ≤ 0.8 | ≤1.0 |
| Apparent Porosity % | ≤18 | ≤ 19 | ≤20 |
| Cold Crushing Strength MPa | ≥ 80 | ≥ 80 | ≥75 |
| Refractoriness Under Load 0,2 MPa °C | >1650 | >1600 | >1580 |
| Bulk Density g/cm3 | 2.5 | 2.3 | 2.5 |
Features
1. Готовые изделия обладают:Product Characteristics:
Low thermal expansion coefficient
Superior resistance to metallurgical slags and glass melts
Exceptional wear resistance at elevated temperatures
2. Physicochemical Properties (vs. High-Alumina Bricks):
Refractoriness: 1770–1830°C
Load softening onset temperature: 1500–1650°C
3. High-Temperature Mechanism of Sillimanite
Upon heating, sillimanite decomposes into mullite (3Al₂O₃·2SiO₂) and silica (SiO₂). The resulting volumetric expansion effectively counteracts product shrinkage caused by increased liquid-phase formation at high temperatures. This controlled expansion:
✓ Compensates for firing shrinkage
✓ Reduces localized stresses
✓ Prevents crack formation
✓ Enhances thermal shock resistance
✓ Minimizes mechanical spalling
Significantly extends overall service life
Applications
✓ Crown of glass melting furnace
✓ Roof of electric furnace
✓ Thermal insulation for feeder channel cover
✓ Burner block assembly
✓ Regenerator checkerwork
✓ Arch masonry construction, etc.
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