Description

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Zero Expansion Silica Bricks are engineered from high-purity silica, offering near-zero thermal expansion, excellent thermal shock resistance, and high mechanical strength. These bricks are designed to withstand extreme temperatures and harsh environments, ensuring long-lasting performance and reliability. Their low thermal conductivity and lightweight design make them energy-efficient and easy to install.

Fused Silica Brick have a high load softening temperature, which can reach 1690℃. They can be used in high-temperature glass kilns. Moreover, the thermal expansion rate of special silica bricks is lower than that of high-quality silica bricks used in general glass kiln sand coke oven. They will not expand or crack after long-term use.

Product Parameters

Brand Properties		SG98
Chemical Composition (%)	SiO₂	≥94
	Al₂O₃	≤1.1
	CaO	≤0.05
	Fel₂O₃+TiO₂(%)	≤0.1
Apparent Porosity (%)		≤17
Cold Crushing Strength (MPa)		≥35
0.2MPa Refractoriness Under Load (℃)		＞1690
Bulk Density (g/cm³)		1.88
(times) Thermal Shock resistance water cool		＞30

Product Usage:

Zero Expansion Silica Bricks are widely used in industries requiring high-temperature stability and minimal thermal expansion, including:

Ceramic Industry: Kiln furniture and firing chambers for tiles, tableware, and technical ceramics.
Glass Industry: Melting tanks and annealing furnaces.
Steel Industry: Ladles, tundishes, and blast furnaces.
Chemical Industry: Heat exchangers and reactors for high-temperature processes.
Power Generation: Boilers and thermal insulation systems.

Product Advantages

Superior Thermal Stability

The most prominent feature of Zero Expansion Silica Bricks is their near-zero thermal expansion. This means that even when exposed to extreme temperature fluctuations, the bricks maintain their structural integrity and dimensional stability. This is crucial for applications like glass furnaces and coke ovens, where any deformation can lead to significant operational issues and increased maintenance costs.

Enhanced Durability

These bricks are known for their exceptional durability. Their high refractoriness under load ensures they can withstand prolonged exposure to high temperatures without degrading. This translates into longer service life, reducing the need for frequent replacements and minimizing downtime.

Thermal Shock Resistance

Fused Silica Bricks are designed to handle rapid temperature changes without cracking or spalling. This thermal shock resistance is particularly valuable in hot repair operations, where quick and reliable solutions are essential. The ability to install these bricks without preheating further enhances their practicality and efficiency.

Chemical Stability

The high purity of silica (up to 99%) in these bricks provides excellent resistance to chemical attack. This is critical in environments where the bricks are exposed to corrosive substances, ensuring they remain robust and reliable over time.

Cost-Effective Solution

While offering superior performance, fused Silica Bricks are also cost-effective. Their long service life and reduced maintenance requirements mean lower overall operational costs. This makes them an attractive option for buyers looking to optimize their budget while maintaining high operational standards.

Product technology:

Key steps include:

1. Raw Material Selection

The process begins with the careful selection of high-purity silica raw materials. This step is crucial as the purity of silica directly impacts the thermal stability and chemical resistance of the bricks. High-purity quartz sand or quartzite is typically used, with silica content often exceeding 99%.

2. Crushing and Grinding

The raw materials are then crushed and ground into fine powders. This step ensures uniform particle size distribution, which is essential for achieving the desired density and strength of the bricks.

3. Mixing and Forming

The ground materials are mixed with binders and additives to enhance the bricks' mechanical properties. The mixture is then formed into the desired shapes using hydraulic presses or extrusion techniques. This forming process ensures the bricks have consistent dimensions and structural integrity.

4. Drying and Firing

After forming, the bricks are dried to remove any residual moisture. They are then fired in high-temperature kilns, typically at temperatures exceeding 1300°C. This firing process is critical for achieving the bricks' low thermal expansion characteristics and high refractoriness.

5. Quality Control and Testing

Throughout the production process, strict quality control measures are implemented. The bricks undergo rigorous testing to ensure they meet the required standards for thermal expansion, strength, and chemical stability. This ensures that the final product is reliable and performs consistently in high-temperature applications.

6. Packaging and Delivery

Finally, the bricks are carefully packaged to prevent damage during transportation. They are then ready for delivery to customers worldwide, ready to meet the demanding requirements of various industrial applications.

Why Choose Us?

23+ years experience focus on refractories field
2 plants with 3 sets of tunnel kilns for 120,000 tonnes capacity
3 QC Labs Technology Centres
120+ employees with ISO9001,TUV,SGS,Intertek certifications
100+abroad customers in 50+ countries
20+ major industry furnace projects yearly
OEM service are available with
RHI,CALDERYS,INTOCAST,REFRATECHNIK,VESUVIUS etc

Packing

Shock-Absorbent Wrapping: Each brick is individually wrapped to prevent damage during transit.
Custom Crating: For bulk orders, bricks are packed in sturdy wooden crates to ensure safe transportation.

FAQ

Q: What are the main advantages of Zero Expansion Silica Bricks?

A: Fused Silica Bricks have an extremely low thermal expansion coefficient, making them ideal for applications where dimensional stability is crucial. They also offer excellent thermal shock resistance, high refractoriness under load, and superior chemical stability.

Q: What are the typical applications of fused Silica Bricks?

A: These bricks are widely used in glass furnaces for hot repair, coke ovens, and other high-temperature industrial furnaces where long service life and minimal deformation are required.

Q: How do fused Silica Bricks perform in terms of thermal expansion?

A: They exhibit near-zero expansion, which means they can maintain their shape and integrity even under prolonged exposure to high temperatures. This property helps reduce maintenance costs and downtime.

Q: Are refractory fused Silica Bricks suitable for hot repair operations?

A: Yes, they are. Their low thermal expansion and excellent thermal shock resistance make them suitable for hot repair, as they can be installed without preheating and will not crack or deform easily.

Q: What is the typical composition of Zero Expansion refractory Silica Bricks?

A: They are made of high-purity silica (SiO₂) with a content of up to 99%, ensuring their excellent chemical and physical properties.

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