Introduction
Silicon carbide bricks are refractory materials primarily composed of SiC, featuring a Mohs hardness of 9 and excellent stability against acidic slags. With SiC contents ranging from 72% to 99%, these bricks are categorized into various types, including:
Clay-bonded,Si₃N₄-bonded,Sialon-bonded,β-SiC-bonded,Si₂ON₂-bonded,Recrystallized silicon carbide bricks
Common applications include non-ferrous metallurgy, aluminum casting molds, electric furnace linings, and heat exchangers.
Manufacturing and Crystalline Structure
Silicon carbide bricks are produced using silicon carbide (typically black SiC with >96% purity) as the primary raw material. The manufacturing process includes batching, mixing, shaping, and firing-with or without the use of binders.
Renowned for their high-performance characteristics-abrasion resistance, corrosion resistance, high-temperature strength, thermal shock stability, high thermal conductivity, and low thermal expansion-they are considered advanced refractory materials.
Advantage
Exceptional Refractoriness
Silicon carbide has a high melting point, with refractoriness ranging from 1700–2000°C. It can endure high-temperature environments without softening or deforming, making it ideal for kiln linings and high-temperature components.
Superior Hardness and Strength
With a Mohs hardness of 9.2–9.5 (second only to diamond and cubic boron nitride), silicon carbide bricks exhibit excellent abrasion and impact resistance. They can withstand scouring, friction, and mechanical collisions without wear or structural damage, ensuring a long service life.
High Thermal Conductivity
Silicon carbide bricks possess thermal conductivity far greater than that of traditional refractory materials like clay and high-alumina bricks. This facilitates rapid heat transfer in kilns and thermal equipment, improving energy efficiency and supporting energy-saving goals.
Low Thermal Expansion
The low thermal expansion coefficient of silicon carbide bricks minimizes volume changes under high temperatures. This gives them outstanding thermal shock resistance, allowing them to withstand rapid temperature changes without cracking or spalling-ideal for kiln components exposed to frequent thermal cycling.
Excellent Chemical Stability
Silicon carbide bricks maintain structural integrity in both acidic and alkaline environments. In chemical kilns and high-temperature chemical processes, they resist corrosion and ensure long-term stability and reliability.
Oxidation Resistance
At certain temperatures, a dense silica protective film forms on the brick surface, shielding the internal SiC from further oxidation. However, oxidation resistance may diminish at extremely high temperatures or in specific atmospheres. Additives or surface coatings can be used to improve oxidation resistance in such conditions.
Physical and Chemical Specifications
|
ltem |
Oxide bond SiC brick |
Green SiC brick |
Corundum SiC brick |
Mullite SiC brick |
High alumina SiC brick |
|
SiC, % |
≥90 |
≥90 |
≥70 |
≥65 |
≥20 |
|
Al2O3, % |
– |
– |
– |
≥20 |
≥55 |
|
Fe2O3, % |
≤0.6 |
≤0.6 |
≤1.0 |
≤1.0 |
≤1.5 |
|
Bulk density, g/cm3 |
≥2.6 |
≥2.6 |
≥2.7 |
≥2.3 |
≥2.5 |
|
Apparent porosity, % |
≤17 |
≤17 |
≤22 |
≤20 |
≤20 |
|
Cold crushing strength, MPa |
≥100 |
≥100 |
≥100 |
≥80 |
≥80 |
|
Refractoriness under load (0.2MPa,0.6%) |
≥1650 |
≥1650 |
≥1700 |
≥1600 |
≥1600 |
Raw Materials
Silicon Carbide (SiC)
Process
The common production methods for silicon carbide refractory bricks include:
Vibration Molding Process
Isostatic Pressure Molding Process
Extrusion Molding Process
Application
Silicon carbide refractory bricks are widely used in high-temperature industrial applications due to their excellent performance. Key application areas include:
Steel Industry
Blast Furnaces
Application: Lining materials for furnace bellies, waists, and lower sections that endure extreme temperatures, pressure, and erosion from slag and molten iron.
Hot Blast Furnaces
Application: Used in lattice bricks and linings for regenerators and combustion chambers.
Non-ferrous metal industry
Aluminum Electrolyzers
Application: Linings for electrolyzers, resisting erosion from cryolite–alumina melts.
Copper Smelting Furnaces
Application: Linings, bottoms, and flues exposed to high-temperature copper matte and slag.
Glass Industry
Glass Furnaces
Application: Linings for furnace bath walls, flow holes, and regenerators.
Ceramic Industry
Ceramic Kilns
Application: Components of roller kilns, tunnel kilns, and others, including kiln car tables, walls, and roofs.
Chemical industry
High-Temperature Chemical Reactors
Application: Linings for reactors such as ammonia converters and sulfuric acid boiling furnaces.
Coal Gas Generators
Application: Linings for gas generators exposed to high temperatures and reducing atmospheres during gasification.
Why chooes us?
01/Customized dimensions and shapes
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02/Delivery cycle and logistics
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Sea freight, land freight. Determine the mode of transportation according to the needs
About 30 days, customized products delivery time depends on the actual situation.
03/Customized packaging
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04/Purchase ZINFON refractory Bricks at Reasonable Prices
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The price of refractory bricks is a known key factor influencing customers' purchasing decisions. Therefore, we offer affordable refractory bricks for sale. Here are several reasons why ZINFON provides refractory bricks at competitive prices:
Factory price
By collaborating with ZINFON, we ensure that customers enjoy the ex-factory price of refractory bricks, reducing costs from middlemen or distributors. This allows customers to obtain the most cost-effective pricing directly from the source.
Low raw material cost
ZINFON is surrounded by abundant mineral resources. With these high-quality materials, customers can obtain products that are both affordable and excellent in performance.
Mass production
ZINFON possesses advanced production equipment and technologies, enabling the factory to achieve economies of scale and reduce unit production costs. Meanwhile, it ensures a continuous supply of high-quality products at preferential prices.
It is worth noting that while price is an important factor, it should not be the sole determinant of your purchasing decision. When buying refractory bricks from ZINFON, quality, reliability, and technical support are equally important considerations.
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Our address
Qinghua Management Dist., Dashiqiao City, Yingkou City, Liaoning, China
Phone Number
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+8618540210631
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