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China Zero Expansion Silica Brick Suppliers - High-Quality Fused Silica Brick from Reliable 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 Brick (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 maximum service temperature of zero-expansion silica bricks?
Zero-expansion silica bricks (fused silica bricks) can maintain structural integrity at temperatures up to 1750°C. With a SiO₂ content of ≥98% and a refractoriness under load of ≥1680°C (at 0.2 MPa, 0.6% deformation), they are well-suited for the most demanding high-temperature industrial applications.
How does the thermal expansion coefficient of silica bricks compare to ordinary refractory bricks?
Zero-expansion silica bricks feature an exceptionally low thermal expansion coefficient of ≤0.1×10⁻⁶/°C, which is significantly lower than that of ordinary refractory bricks. This near-zero expansion virtually eliminates the risk of cracking or deformation caused by rapid temperature fluctuations, making them ideal for cyclic high-heat environments.
How many thermal shock cycles can silica bricks withstand?
Both calcium-free silica bricks and zero-expansion silica bricks are rated for more than 30 thermal shock cycles at 1100°C water quench conditions. This far exceeds the performance of standard refractory materials, making them the preferred choice for furnaces and kilns that undergo frequent heating and cooling cycles.
What industries are silica bricks most commonly used in?
Silica bricks are widely used 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, non-ferrous smelting furnaces), and other applications such as waste incinerators, chemical reactor chambers, and thermal power plant boilers.
What is the difference between calcium-free silica bricks and zero-expansion (fused) silica bricks?
While both products offer excellent high-temperature performance, zero-expansion fused silica bricks have a higher SiO₂ purity (≥98% vs. ≥97%), lower Al₂O₃ content (≤0.2% vs. ≤1.1%), lower CaO content (≤0.01% vs. ≤0.05%), and higher cold crushing strength (≥40 MPa vs. ≥35 MPa). Fused silica bricks are the preferred choice for applications requiring the strictest dimensional stability and chemical purity.
Can silica bricks resist chemical erosion from acidic slags and gases?
Yes. Due to their high SiO₂ content, silica bricks exhibit excellent resistance to acidic media, including acidic slags, furnace dust, and corrosive gases encountered in metallurgical and chemical processes. Their dense texture and low apparent porosity (≤16–17%) further prevent gas penetration and chemical infiltration, significantly extending service life in harsh environments.