Carbon bricks are type of carbonaceous refractory material made from coke, anthracite, or graphite mixed with tar. These materials are shaped and fired in a reducing flame at 1450°C.
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Refractory Brick
ZINFON Refractory Bricks
Refractory bricks, commonly known as firebricks, are materials made from refractory clay or other refractory raw materials through firing. They are primarily used for lining smelting furnaces and can withstand high temperatures ranging from 1580°C to 1770°C.
Classified by manufacturing process, refractory bricks can be divided into fired bricks, unshaped bricks, electrofused bricks (also known as cast fused bricks), and refractory insulating bricks. Based on shape and size, they include standard bricks, regular bricks, special-shaped bricks, and others.
Refractory bricks are used as high-temperature construction and structural materials for industrial kilns and various thermal equipment. They are capable of withstanding physical and chemical changes, as well as mechanical stresses at high temperatures. Common examples include fireclay bricks, high-alumina bricks, silica bricks, and others.
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![Carbon Refractory Bricks]()
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![Mullite Insulation Brick]()
Mullite Insulation BrickMullite insulation bricks are a new type of refractory material in China that can directly contact flames.read more
● Good high-temperature stability.
● Low thermal... -
![Fused AZS Brick]()
Fused AZS BrickThe production of fused zirconia corundum (AZS) bricks requires a precise electric fusion process.read more
● Strong high-temperature performance.
● Good thermal... -
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Soft Fire Brick•Lightweight structureread more
•excellent thermal insulation performance
•low thermal conductivity -
![High Alumina Brick]()
High Alumina BrickHigh alumina bricks are a type of refractory material with a primary composition of Al2O3. These bricks, which are neutral refractory materials with an alumina content of over 48%, are made from...read more -
![Fireclay Brick]()
Fireclay BrickFireclay or clay bricks are made from clay (including materials like shale and coal gangue) as the main raw material, processed through mixing, forming, drying, and firing.read more
● Good... -
![Low-porosity Clay Brick]()
Low-porosity Clay BrickLow-porosity clay bricks are made from low-alumina mullite as the main raw material, formed under high pressure and sintered at high temperatures.read more
● Low porosity with good... -
![Low-creep Clay Brick]()
Low-creep Clay BrickLow-creep clay refractory bricks are made from high-quality raw materials with minimal impurities, such as dense and pure fused corundum, andalusite, and kyanite.read more
● High load... -
![Ultral High Alumina Brick]()
Ultral High Alumina BrickUtral high alumina bricks are high-performance refractory materials known for their high alumina content and exceptional fire resistance.read more
● Enhanced corrosion resistance.... -
![Anti-stripping High Alumina Brick]()
Anti-stripping High Alumina BrickAnti-stripping high alumina bricks are manufactured using premium-grade high alumina bauxite clinker and materials containing ZrO2, which are mixed in specific proportions, formed under high...read more -
![Phosphate Bonded High Alumina Brick]()
Phosphate Bonded High Alumina BrickPhosphate bonded high alumina bricks are made by using phosphate as a binder to combine bauxite aggregate, and are formed by machine pressing.read more
● High strength with excellent... -
![Sillimanite Brick]()
Sillimanite BrickSillimanite-based products are made by adding a certain proportion of sillimanite, andalusite, or kyanite, along with other trace elements, to the raw materials of high alumina bricks.read more
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Physical and Chemical Properties of Refractory Bricks
1.Chemical Composition
The chemical composition determines the core properties of refractory bricks, including their high-temperature resistance and corrosion resistance.
2.Refractoriness
Refractoriness refers to the ability of refractory bricks to resist melting at high temperatures under no-load conditions, measured in °C. It is a key indicator used to classify the grades of refractory materials. The refractoriness of ordinary refractory bricks ranges from 1580°C to 1770°C, high-grade refractory bricks range from 1770°C to 2000°C, and premium-grade refractory bricks have a refractoriness above 2000°C.
3.Refractoriness Under Load (RUL)
Refractoriness under load refers to the temperature at which refractory bricks begin to deform when heated under a constant load. It reflects their structural strength at high temperatures. The closer this value is to the refractoriness, the better the high-temperature stability of the refractory bricks.
4.Bulk Density: The mass of refractory bricks per unit volume. The higher the density, the denser the structure, and the stronger the corrosion and wear resistance.
5.Apparent Porosity: The volume ratio of open pores in the refractory bricks. The lower the porosity, the stronger the resistance to corrosion from molten materials. However, an appropriate amount of closed pores can enhance thermal shock resistance.
6.Thermal Shock Resistance
Thermal shock resistance refers to the ability of refractory bricks to resist cracking and spalling caused by rapid temperature changes. It is a key factor in selecting materials for kilns that undergo frequent startups and shutdowns. It is usually measured by the number of water-cooling cycles a material can withstand. For example, mullite bricks exhibit excellent thermal shock resistance and are ideal for applications with periodic temperature changes, such as in ceramic tunnel kilns.
7.Cold Crushing Strength (CCS)
Cold crushing strength refers to the ability of refractory bricks to withstand pressure at room temperature, measured in MPa. It reflects their forming quality and mechanical strength. The higher the strength, the better the resistance to impact from materials and structural stress in furnaces.
8.Slag Corrosion Resistance
Slag corrosion resistance refers to the ability of refractory bricks to resist chemical corrosion and physical erosion caused by molten slag, molten metal, and other materials.
Types of ZINFON Refractory Bricks
| Fire clay brick
Fireclay Brick
Low-porosity Clay Brick
Low-creep Clay Brick
| Alumina Brick
High Alumina Brick
Ultral High Alumina Brick
Anti-stripping High Alumina Brick
Phosphate Bonded High Alumina Brick
Sillimanite Brick
Andalusite Brick
Honeycomb Ceramics
| Silica Brick
Silica Refractory Bricks
Fused Silica Brick
| Carbon Brick
Carbon Refractory Bricks
Silicon Carbide Refractory Brick
Silicon Nitride Bonded Silicon Carbide Brick
| Zirconia/Chromia (Corundum) Brick
High Zircon Bricks
Fused AZS Brick
Sintered Zirconia Corundum Brick
Dense Zircon Brick
Corundum Brick
Chrome Corundum Brick
High Chrome Brick
| Insulation Brick
Soft Fire Brick
Light Weight Fireclay Brick
Light Weight High Alumina Brick
Mullite Insulation Brick
Alumina Bubble Brick
| Acid Resistant Brick
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Advantages of Refractory Bricks
1.Excellent High-Temperature and Thermal Shock Resistance
Refractory bricks made from different materials can withstand temperatures ranging from 1500°C to 2000°C or even higher, enabling long-term, stable operation in high-temperature equipment such as kilns and blast furnaces. In addition, high-quality refractory bricks have excellent thermal shock resistance, making them less likely to crack or spall under conditions where temperatures fluctuate rapidly. This enhances the service life of equipment linings.
2.Strong Corrosion Resistance for Complex Working Conditions
Refractory bricks effectively resist corrosion and erosion caused by media such as molten metal, furnace slag, and acid-alkali flue gases. For instance, high-alumina bricks offer balanced resistance to both acids and alkalis, making them ideal for challenging environments like cement rotary kilns, and helping to reduce wear on equipment linings.
3.High Mechanical Strength and Wear Resistance
Molded refractory bricks feature a dense structure and high compressive strength. They can support the weight of furnaces, resist material impact, and endure structural stress at high temperatures without easily deforming or collapsing. Additionally, they possess excellent wear resistance, allowing them to withstand the scouring of materials inside kilns.
4.Convenient Construction and Versatile Adaptability
Refractory bricks are standardized prefabricated components with consistent size and specifications. They can be easily installed and arranged according to kiln design requirements, ensuring high construction efficiency. For specialized parts (such as furnace mouths and flue corners), custom-shaped bricks are available to meet the structural needs of various industrial equipment.
5.High Cost-Effectiveness and Low Comprehensive Operation and Maintenance Costs
Compared to monolithic refractory materials like castables, refractory bricks have a longer service life. In the event of damage, individual bricks can be replaced without needing full-scale repairs, greatly reducing maintenance costs and downtime. This makes them especially well-suited for industrial scenarios with large-scale, continuous production.
6.Strong Chemical Stability Without Contaminating Products
In high-temperature environments, refractory bricks maintain stable chemical properties and do not react chemically with the materials inside the furnace. This ensures the purity of metallurgical products, cement clinker, and other materials, preventing product quality issues caused by contamination.
Application Fields of Refractory Bricks
1.Metallurgical Industry
As the core lining material for both ferrous and non-ferrous metal smelting, refractory bricks are used in equipment such as blast furnaces, converters, electric arc furnaces, and ladles. They resist the erosion caused by molten metal and furnace slag.
2.Building Materials Industry
Refractory bricks serve as the key lining for cement rotary kilns, glass furnaces, and ceramic kilns, enduring high temperatures, material scouring, and periodic temperature changes.
3.Chemical Industry
Used as linings for equipment such as coal chemical gasifiers, ammonia synthesis converters for chemical fertilizers, and acid-alkali reactors, refractory bricks resist high-temperature corrosion and chemical medium erosion.
4.Power Industry
Refractory bricks are applied to the boiler furnaces and flues of thermal power plants, as well as the linings of waste incinerators. They are capable of withstanding high-temperature flue gas scouring and fly ash abrasion.
5.Other Fields
Refractory bricks are also suitable for special high-temperature applications such as metal heat treatment furnaces, high-temperature test equipment for military and aerospace use, and hazardous waste treatment kilns.
Process of Refractory Brick
How to Select Suitable Refractory Bricks
When selecting refractory bricks, placing too much emphasis on price can lead to misunderstandings. Instead, focus first on the application scenarios, performance, quality, and service life of the product, and then consider the price. Choosing products without quality assurance simply to lower costs may lead to unnecessary losses.
Clarify the service environment: Ensure the refractory bricks are suitable for the specific conditions in which they will be used.
Select the appropriate material: Choose the material that best fits the thermal, mechanical, and chemical conditions of the application.
Pay attention to the physical property indicators: Consider properties such as thermal shock resistance, density, and compressive strength.
Inspect the appearance and dimensions: Verify that the bricks have no visible defects and conform to the required specifications.
Confirm compatibility and after-sales service: Ensure that the product is compatible with other materials and that the supplier provides adequate support and service.
Please contact me to submit your requirements
Precautions for the Use of Refractory Bricks
1.Before using refractory bricks, clean the dust and slag from the inner wall of the kiln shell to prevent the bricks from loosening.
2.The inner surface of the kiln shell should be flat, without unevenness or inclination.
3.Control the joints between refractory bricks to a range of 1.5mm to 2mm.
4.Use special mortar designed for bonding refractory bricks.
5.Leave appropriate expansion joints between refractory bricks.
6.Pre-masonry should be carried out first for the linings of key parts and areas with complex shapes.
7.Ensure that the locking joints are firm. Use a brick cutter for precision machining of bricks, rather than manual processing. The size of the capping bricks inside the rotary kiln and under the brick support plates should not be less than 70% of the original bricks. For joint bricks and curve bricks on flat surfaces, the size should not be less than half of the original bricks. Locking joints must be made with original bricks. The processed surfaces of bricks should not face the inside of the furnace chamber.
8.Refractory materials should be stored in dry warehouses.
FAQ
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