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China Zero Expansion Silica Brick Suppliers - High-Quality Fused Silica Brick from Reliable Factory for Industrial Use
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
Q What is the thermal expansion coefficient of zero-expansion silica bricks?
Zero-expansion silica bricks feature an extremely low thermal expansion coefficient of ≤0.1×10⁻⁶/°C. This near-zero expansion property ensures dimensional stability even under rapid and repeated temperature fluctuations, making them ideal for high-heat cyclic environments.
Q How many thermal shock cycles can these silica bricks withstand?
Both calcium-free silica bricks and fused silica bricks can withstand more than 30 thermal shock cycles at 1100°C water quench conditions. This far exceeds the performance of ordinary refractory bricks, making them suitable for equipment with frequent temperature changes.
Q What is the maximum service temperature of these silica bricks?
These high-purity silica bricks (SiO₂ ≥98%) can maintain structural integrity at temperatures up to 1750°C. The refractoriness under load (0.2MPa, 0.6%) is ≥1690°C for calcium-free silica bricks and ≥1680°C for fused silica bricks.
Q Which industries are silica bricks most commonly used in?
Silica bricks are widely used across the glass industry (regenerators, checker chambers, furnace throats), ceramic and porcelain industry (kiln firing and cooling zones), metallurgical industry (coke ovens, blast furnace hot blast stoves), as well as in waste incinerators, chemical reactors, and thermal power plant boilers.
Q What is the difference between calcium-free silica bricks and fused silica bricks?
Fused silica bricks have higher purity (SiO₂ ≥98% vs ≥97%), lower impurity content (Al₂O₃ ≤0.2%, CaO ≤0.01%), and higher cold crushing strength (≥40 MPa vs ≥35 MPa). Fused silica bricks also exhibit lower apparent porosity (≤16%) and superior zero-expansion characteristics, making them the premium choice for the most demanding high-temperature applications.
Q How do silica bricks resist chemical erosion in high-temperature furnaces?
The high SiO₂ content (≥97–98%) gives silica bricks excellent resistance to acidic media and furnace dust erosion. Their dense texture and low porosity (≤16–17%) prevent gas penetration and acidic slag infiltration, effectively protecting the furnace lining structure and significantly extending service life.