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China Zero Expansion Silica Brick Suppliers - High-Quality Fused Silica Brick from Trusted Factory for High-Heat Applications
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 ≥30 times), 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 |
| Bulk Density (g/cm³) | ≥1.88 | ≥1.85 |
| Apparent Porosity (%) | ≤17 | ≤16 |
| Cold Crushing Strength (MPa) | ≥35 | ≥40 |
| Refractoriness Under Load ℃ (0.2MPa, 0.6%) | ≥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
Contact us now for a quote and experience the difference of working with the best in the business.
Frequently Asked Questions
What is the thermal expansion coefficient of zero-expansion silica bricks?
Zero-expansion silica bricks (fused silica bricks) feature an exceptionally low thermal expansion coefficient of ≤0.1×10⁻⁶/°C. This near-zero expansion rate ensures the bricks maintain dimensional stability even under rapid or extreme temperature fluctuations, preventing cracking and deformation in high-heat cycling environments.
How many thermal shock cycles can these silica bricks withstand?
Both the calcium-free silica brick and the zero-expansion silica brick (fused silica brick) can withstand more than 30 thermal shock cycles at 1100°C water quench conditions. This superior heat shock resistance far exceeds that of ordinary refractory bricks, making them ideal for equipment that undergoes frequent and rapid temperature changes.
What is the maximum operating temperature for fused silica bricks?
Fused silica bricks, crafted with high-purity silica (SiO₂ ≥98%), can maintain structural integrity at temperatures up to 1750°C. They also offer excellent resistance to erosion from acidic media and furnace dust, which significantly extends their service life in demanding high-temperature applications.
Which industries are silica bricks most commonly used in?
Silica bricks are widely applied across multiple high-temperature industries. Key applications include regenerators and throat areas in glass melting furnaces, firing and cooling zones in ceramic kilns, linings for coke ovens and blast furnace hot blast stoves in metallurgy, as well as waste incinerator linings, chemical reactor chambers, and thermal power plant boiler partitions.
What is the difference between calcium-free silica bricks and zero-expansion silica bricks?
The primary differences lie in purity and mechanical performance. Zero-expansion (fused) silica bricks have a higher SiO₂ content (≥98% vs ≥97%), lower Al₂O₃ and CaO impurities, higher cold crushing strength (≥40 MPa vs ≥35 MPa), and lower apparent porosity (≤16% vs ≤17%). Both types share excellent thermal shock stability of over 30 cycles at 1100°C.
How do silica bricks prevent furnace leakage and gas penetration?
Silica bricks feature a dense texture with low apparent porosity (≤16–17%), which effectively blocks gas penetration through the furnace walls. Combined with high cold crushing strength (≥35–40 MPa) and excellent structural stability under thermal cycling, they create a reliable, tight furnace lining that enhances overall equipment safety and operational efficiency.