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Zero Expansion Silica Brick (Fused Silica Brick) - High Refractory from China Suppliers & Factory
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 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, making them ideal for high-cycle thermal environments.
How many thermal shock cycles can these silica bricks withstand?
Both calcium-free silica bricks and zero-expansion (fused) silica bricks are tested to withstand more than 30 thermal shock cycles at 1100°C water quench conditions. This far exceeds the performance of ordinary refractory bricks, making them highly suitable for equipment subject to frequent temperature changes.
What is the maximum service temperature of fused silica bricks?
Fused silica bricks are crafted from high-purity silica (SiO₂ ≥98%) and can maintain structural integrity at temperatures up to 1750°C. They also demonstrate excellent resistance to acidic media and furnace dust erosion, significantly extending service life in demanding industrial applications.
In which industries are zero-expansion silica bricks most commonly used?
These bricks are widely applied across several high-temperature industries, including the glass industry (regenerators, checker chambers, furnace throats), the ceramic and porcelain industry (kiln firing and cooling zones), the metallurgical industry (coke ovens, blast furnace hot blast stoves, smelting furnaces), as well as waste incinerators, chemical reactor chambers, and thermal power plant boilers.
What is the difference between calcium-free silica bricks and zero-expansion silica bricks?
While both types offer excellent high-temperature performance, zero-expansion (fused) silica bricks have higher purity (SiO₂ ≥98% vs. ≥97%), lower impurity levels (Al₂O₃ ≤0.2%, CaO ≤0.01%), and higher cold crushing strength (≥40 MPa vs. ≥35 MPa). Calcium-free silica bricks offer a slightly higher bulk density (≥1.88 g/cm³) and refractoriness under load (≥1690°C). Both types share the same outstanding thermal shock stability of more than 30 cycles.
How do silica bricks prevent gas leakage in high-temperature furnaces?
Silica bricks feature a dense texture with low apparent porosity (≤16–17%), which effectively blocks gas penetration through the furnace walls. Combined with their high cold crushing strength (≥35–40 MPa) and near-zero thermal expansion, they maintain tight structural integrity even under extreme thermal cycling, preventing furnace leakage and enhancing overall operational safety.