Fused Silica Brick

Introduction

 

Fused silica bricks, a representative high-performance refractory material, are indispensable in industries such as glass furnaces, semiconductor equipment, and high-temperature chemical processing due to their ultra-low thermal expansion coefficient, exceptional thermal shock resistance, and chemical corrosion resistance. Their primary applications include:

 

• Glass Industry

Critical components in float glass furnaces: crowns, throats, and breast walls.

• Electronics & Semiconductors

Linings for polycrystalline silicon ingot furnaces and insulation layers for diffusion furnaces.

• Chemical & Environmental Protection

Secondary combustion chambers in waste incinerators and linings for hazardous waste treatment reactors.

• Precision Casting

Investment casting shell materials to minimize deformation and cracking.

 

Fused silica bricks are produced using high-purity silicon dioxide as the core raw material. The manufacturing process involves melting via an electric arc furnace, rapid cooling to form an amorphous glass phase, and subsequent precision molding and heat treatment.

 

Advantage

 

1. Thermal Properties

Ultra-low coefficient of thermal expansion and exceptional thermal shock resistance, withstanding ~35 thermal cycles between 1300°C and 20°C (air/water) without cracking.
Higher thermal conductivity compared to magnesia bricks.

2. Chemical Stability

Resistant to acids (e.g., hydrochloric, sulfuric, nitric) except hydrofluoric acid (HF) and concentrated phosphoric acid (>300°C).
Minimizes contamination of molten glass in glass furnace applications.

3. Mechanical Properties

Flexural and compressive strengths increase with temperature, while plasticity rises and brittleness decreases.
Lower room-temperature strength due to low bulk density, high porosity, and loose structure.

4. Electrical Properties

High resistivity with minimal temperature dependence of the dielectric constant (3.0–3.5) and loss tangent (<0.0004), outperforming corundum and high-temperature ceramics.
Ideal for high-temperature insulation applications.

5. Low Porosity

Provides excellent sealing and impermeability, preventing the intrusion of external substances and extending service life in harsh environments.

6. Optical Transparency

High transmittance in the visible and near-infrared spectra, advantageous for specialized optical components (e.g., transparent high-temperature windows).

7. Processability

Machinable via cutting, grinding, drilling, etc., enabling customization for diverse applications.
Compatible with material composites to enhance performance.

8. Environmental Sustainability

The main component (silicon dioxide) minimizes pollution during production and use.
Recyclable and reusable, aligning with sustainable development goals.

 

Zinfon Refractory Technology Co.,Ltd.

 

We provide one-stop services from technical consultation to design, production, and after-sales support.

Manufacturer Direct

Factory Prices

Premium Service

precision parts processing

Customization Available

Fused quartz crucibles are manufactured by melting pure quartz sand in an electric furnace at temperatures exceeding 1800°C, followed by precision cutting with specialized equipment to meet various specifications. Standard-purity products contain >99.5% SiO₂, while high-purity variants achieve ≥99.99% SiO₂.

The glassy matrix contains numerous 0.003–0.3 mm bubbles that cause spectral dispersion, giving the crucibles an opaque appearance. The microbubble gas composition is approximately 60% CO, 10% CO₂, 8% O₂, and 22% N₂. This unique structure imparts advantageous properties-thermal insulation, thermal stability, and infrared absorption/emission capabilities-making it an advanced refractory material.

 

Glass Industry Applications

Furnace Structural Components
Used in key parts of low-alkali borosilicate glass melting furnaces (e.g., upper tank walls), as well as crowns, throat areas, and breast walls of float glass furnaces.

Furnace Lining Materials
Function: Linings for furnace crowns, breast walls, and tank walls.
Properties: Excellent thermal shock resistance and chemical stability, withstanding high-temperature erosion and molten glass scouring. This reduces furnace corrosion, extends service life, and ensures glass quality.

Glass Forming Equipment
Example: Tin baths in float glass production, where fused silica bricks serve as critical components.
Role: Maintains dimensional stability and performance at high temperatures, enabling precise control over glass forming for surface quality and dimensional accuracy.

 

Electronics & Semiconductors Applications

Semiconductor Manufacturing Equipment
Examples: Linings for polycrystalline silicon ingot furnaces and insulation layers for diffusion furnaces.
Function: Meets high-temperature and high-precision demands in semiconductor fabrication, ensuring process stability via low thermal expansion and high purity. This minimizes impacts on chip manufacturing precision and prevents impurity contamination.

Electronic Component Packaging
Role: Fused silica bricks serve as packaging molds or support components for high-end electronic devices.
Advantages: Provides stable mechanical support and thermal insulation, withstanding high temperatures to protect components and maintain packaging integrity.

Polycrystalline Silicon & Solar Cell Applications

Polycrystalline Silicon Ingot Furnaces
Role: Critical lining material for ingot casting furnaces.
Function: Withstands high temperatures and molten silicon corrosion during crystallization, maintaining a stable environment to enhance polycrystalline silicon quality and yield.

Solar Cell Production Equipment
Applications: Used in high-temperature equipment (e.g., diffusion furnaces, sintering furnaces) for solar cell manufacturing.
Impact: Ensures equipment reliability, boosting production efficiency and solar cell quality.

Metallurgical Industry

Continuous Casting Tundishes
Role: Lining material for tundishes in continuous casting.
Properties & Impact: Excellent thermal shock resistance and insulation stabilize molten steel temperature and flow, reducing heat loss and inclusion formation to improve billet quality.

Induction Furnace Linings
Function: Fused silica bricks serve as linings in induction furnaces, withstanding high-temperature molten metal erosion and providing thermal insulation to ensure furnace reliability.

High-Temperature Furnaces & Precision Casting Applications

High-Temperature Furnaces and Kilns
Applications: Lining or insulation materials for ceramic kilns, refractory material kilns, and other high-temperature systems.
Benefits: Withstands extreme heat, minimizes heat loss, and enhances thermal efficiency by reducing energy consumption in furnace operations.

Precision Casting
Role: Mold materials in precision casting processes, leveraging high thermal stability and dimensional accuracy.
Impact: Ensures casting dimensional precision and surface quality, ideal for high-precision aerospace and automotive components.

By choosing ZINFON as your supplier, you can access high-quality refractory bricks, a wide range of other refractory materials, and comprehensive support. Contact ZINFON Refractories immediately to discuss your specific requirements and obtain customized solutions!

How To Cooperate With Us?

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Provide professional after-sales protection‬

Our address

Qinghua Management Dist., Dashiqiao City, Yingkou City, Liaoning, China

Phone Number

+8613700131695

+8618540210631

E-mail

info@zinfon-refractory.com

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