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Zero Expansion Silica Brick（fused silica brick）
Core Advantages
Near-Zero Thermal Expansion
Features a thermal expansion coefficient of ≤0.1×10⁻⁶/°C, avoiding deformation or cracking caused by rapid temperature fluctuations, ensuring structural stability in cyclic high-heat environments.
Superior Heat Shock Resistance
Excels in withstanding repeated heating and cooling cycles (1100°C water quench ≥30times), far outperforming ordinary refractory bricks, suitable for equipment with frequent temperature changes.
High Refractoriness & Durability
Crafted with high-purity silica (SiO₂≥98%), it maintains integrity at up to 1750°C, resisting erosion from acidic media and furnace dust, extending service life significantly.
Excellent Structural Stability
Dense texture ensures strong compression resistance and low porosity, preventing gas penetration and furnace leakage, enhancing overall equipment operational safety.
Product Parameters
| Item | Calcium-free silica brick | Zero-expansion silica bricks (Fused silica brick) |
| SiO₂ % | ≥97 | ≥98 |
| Al₂O₃ % | ≤1.1 | ≤0.2 |
| CaO % | ≤0.05 | ≤0.01 |
| Fe₂O₃ +TiO₂ % | ≤0.1 | ≤0.1 |
| g/cm³ Bulk Density |
≥1.88 | ≥1.85 |
| % Apparent Porosity |
≤17 | ≤16 |
| MPa Cold Crushing Strength |
≥35 | ≥40 |
| ℃（0.2MPa,0.6%） Refractoriness Under Load |
≥1690 | ≥1680 |
| Thermal shock stability （1100℃ cooling)times | ＞30 | ＞30 |
Detailed Application Scenarios
1. Glass Industry
◎ Widely used in regenerators, checker chambers, and throat areas of glass melting furnaces. Its zero expansion property resists thermal shock from alternating heating/cooling, ensuring furnace tightness and stable glass production quality.
2. Ceramic & Porcelain Industry
◎ Applied in the firing zone and cooling zone of ceramic kilns. Withstands frequent temperature cycles during ceramic sintering, preventing kiln body damage and improving product yield.
3. Metallurgical Industry
◎ Suitable for lining of coke ovens, blast furnace hot blast stoves, and non-ferrous metal smelting furnaces. Resists erosion from high-temperature gas and acidic slag, maintaining furnace structure integrity.
4. Other High-Temp Equipment
◎ Ideal for waste incinerator linings, chemical reactor chambers, and thermal power plant boiler partitions. Provides reliable refractory protection in harsh environments with extreme temperature variations.
Conclusion
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