Silicon carbide brick, also known as SiC brick, is a high-quality refractory material made from high-purity silicon carbide raw materials. Renowned for its excellent thermal conductivity, outstanding wear and corrosion resistance, and superior mechanical strength, SiC bricks are ideal for extreme conditions in high-temperature industrial applications. Whether in steelmaking, glass production, or energy processing, these bricks ensure durability, efficiency, and reliability.
Silicon carbide bricks are specially engineered for harsh thermal and chemical environments. Unlike ordinary fire bricks, they are designed to withstand both high temperatures and aggressive industrial conditions. Depending on their bonding method, SiC bricks can be categorized as:
Clay-bonded silicon carbide bricks – cost-effective and suitable for general industrial use.
Oxide-bonded silicon carbide bricks – excellent chemical resistance for aggressive slag and flue gases.
Recrystallized silicon carbide bricks – extremely durable, suitable for heavy-duty steel and glass applications.
Reaction-bonded silicon carbide bricks – high precision and dimensional stability for specialized industrial furnaces.
Each type is engineered to deliver optimal performance in specific environments, ensuring longer service life and minimal maintenance requirements.
Silicon carbide bricks stand out for their combination of thermal, mechanical, and chemical properties:
High thermal conductivity – typically 12–15 W/m·K at 1000°C, promoting efficient heat transfer.
Excellent wear and scratch resistance – withstands abrasive materials and mechanical stress.
Superior thermal shock resistance – maintains integrity under rapid temperature changes.
High mechanical strength at extreme temperatures – reliable under heavy loads.
Oxidation and chemical resistance – durable in acidic, basic, or oxidative environments.
These properties make SiC bricks suitable for high-stress areas in industrial furnaces, kilns, and other high-temperature equipment.
SiC bricks are widely used in multiple industries due to their durability and high-temperature performance:
Steel Industry – tap holes, ladle linings, and blast furnace troughs.
Non-Ferrous Metallurgy – copper and aluminum melting furnaces, troughs, and burners.
Glass and Ceramics – kiln furniture, burner nozzles, wear-resistant linings, and support bricks.
Chemical Processing – incinerators, reactors, sulfur recovery units (SRU).
Energy Sector – municipal solid waste incineration boilers and coal gasification furnaces.
SiC bricks maximize energy efficiency by reducing heat loss and are particularly suitable for areas exposed to abrasion, slag flow, or thermal cycling.
Producing high-quality SiC bricks requires precision and careful quality control:
Raw Material Selection – high-purity silicon carbide particles combined with appropriate binders and additives.
Mixing – uniform blending ensures consistent density and material performance.
Shaping – bricks can be pressed, extruded, or cast depending on application requirements.
Drying – controlled drying prevents cracking or moisture-related defects.
Firing – sintered in kilns at 1350–1600°C based on brick type.
Finishing & Quality Control – mechanical processing, trimming, and rigorous inspection ensure performance standards are met.
| Type | SiC Content (%) | Al₂O₃ (%) | Bulk Density (g/cm³) | Apparent Porosity (%) | Cold Crushing Strength (MPa) | Max Service Temperature (°C) | Typical Application |
|---|---|---|---|---|---|---|---|
| Oxide-Bonded SiC | ≥90 | ≥20 | ≥2.3 | ≤20 | ≥80 | 1600 | Industrial furnace linings, CFBB, incinerators |
| Green SiC | ≥90 | — | ≥2.6 | ≤17 | ≥100 | 1650 | Non-ferrous metal melting furnaces |
| Recrystallized SiC | ≥70 | — | ≥2.7 | ≤22 | ≥100 | 1700 | Steelmaking, glass furnaces |
Note: Specific values may vary depending on manufacturer and application.
Extended service life – reduces maintenance frequency and costs.
High strength under thermal load – enhances reliability and safety.
Excellent wear resistance – improves operational uptime.
Customizable shapes – adapts to complex industrial furnace designs.
Energy efficiency – high thermal conductivity reduces fuel consumption and heat loss.
Use compatible mortar to prevent chemical mismatch corrosion.
Leave thermal expansion joints in high-temperature zones.
Use support anchors for vertical installations when necessary.
Gradually raise the furnace temperature during initial startup.
India Steel Plant – Recrystallized SiC bricks lasted 2.5× longer than alumina bricks in blast furnace troughs.
Turkey Glass Furnace – Heavy-duty SiC bricks improved thermal efficiency by 18% and reduced maintenance downtime.
Germany Waste Incineration Plant – SiC lining resisted high-sulfur flue gas, enhancing chemical durability.
1. What temperature can SiC bricks withstand?
SiC bricks can handle temperatures up to 1700°C, depending on bonding type and composition.
2. Are silicon carbide bricks chemically resistant?
Yes. They resist most acids, alkalis, slags, and flue gases.
3. Can SiC bricks be customized?
Absolutely. Highland Refractory provides custom sizes, shapes, and processing options.
4. What are the main advantages of SiC bricks?
High durability, excellent thermal conductivity, wear resistance, and energy efficiency.
5. Can SiC bricks help save energy?
Yes. Their high thermal conductivity minimizes heat loss, reducing fuel consumption and operational costs.
Highland Refractory offers high-quality silicon carbide bricks tailored to your industrial requirements. With decades of experience in production and international exports, we provide custom solutions, technical support, and reliable supply. Contact our team for quotes, samples, or technical consultation to optimize your high-temperature processes with durable and efficient SiC bricks.
Silicon carbide plates are mainly composed of silicon carbide (SiC) as the aggregate (with a content usually ≥ 80%).
Silicon carbide castable is an amorphous refractory material with silicon carbide as the main component.
Silica-molybdenum bricks have high resistance to chemical erosion and excellent wear resistance, and are the preferred material for the transition zone and preheating zone of large cement kilns.
Highland Refractory, a trusted supplier of premium AZS Refractory Brick, offers high-performance AZS Brick—engineered from zirconia-alumina-silica (ZrO₂-Al₂O₃-SiO₂) composites for extreme high-temperature and corrosive environments. Our product line includes AZS 33 brick (33% ZrO₂ content), AZS 36 brick (36% ZrO₂), and AZS 41 brick (41% ZrO₂), each designed to withstand continuous operating temperatures up to 1800℃ with exceptional thermal shock resistance and corrosion resistance against molten glass, slags, and acids.
