Mullite brick is a type of refractory brick, which is a compound of alumina (Al2O3) and silica (SiO2). Mullite bricks have a high refractoriness over 1790℃ (3254℉). As a professional supplier, Kerui Refractory mullite bricks are durable and high-temperature resistant products. If you are looking for mullite bricks, I hope this article can help you!
- Al2O3% (≥) :62-70
- Apparent Porosity (%) :26-28
- Refractoriness (℃) :1760-1780
- Permanent Linear Change (%) :-0.1-0.4
What is Mullite Brick?
Different from mullite insulation bricks, mullite brick is a kind of fire brick mainly composed of mineral mullite. Mullite refractory brick has a unique crystal structure that gives mullite bricks special thermal and mechanical properties. What’s more, the alumina content in mullite brick is 65% ~75%. Besides, mullite refractory bricks have wide usage in high-temp industries and furnaces.
Specification of Mullite Brick
|ω (Al2O3)/%||μ0 ≥||70.0||62.0|
|ω (Fe2O3)/%||μ0 ≤||1.8||1.5|
|Apparent Porosity/%||μ0 ≤||28||26|
|Cold Crushing Strength/MPa||μ0 ≥||25|
|Permanent Linear Change (1500℃*2h)/%||Xmin~Xmax||-0.1~+0.4|
Classification of Mullite Brick
Sintered Mullite Brick
Sintered mullite brick is produced by sintering process. What’s more, it consists of high alumina bauxite clinker as the main raw material, with a small amount of clay or raw bauxite as the binding agent. At the same time, the sintering process helps densify mullite bricks, reducing porosity and improving their mechanical strength. In addition, the exact sintering temperature and duration depend on the desired properties and application requirements.
Fused Cast Mullite Brick
Fused cast mullite refractory bricks consist of high bauxite, industrial alumina and refractory clay as raw materials, adding charcoal or coke fines as a reducing agent. In addition, these bricks are manufactured through a fusion casting process. In addition, these high temp refractory bricks have a dense microstructure due to the slow cooling and solidification process, which results in high density and low porosity, to improve their mechanical strength and erosion resistance.
Corundum Mullite Brick
Corundum mullite bricks mainly include corundum (alumina, Al2O3) and mullite (alumina silicate, 3Al2O3-2SiO2). The combination of these two materials gives the brick excellent mechanical strength, high-temperature stability and thermal shock resistance. In addition, these bricks are suitable for use in extreme temperature environments, such as industrial furnaces, kilns, and incinerators. Besides, they are a preferred choice under intense conditions.
Fused cast mullite has larger crystals than sintered mullite and resists thermal shock better than sintered mullite refractory. Meanwhile, their high temperature properties depend mainly on the content of alumina and the uniformity of mullite phase and glass distribution.
Properties of Mullite Bricks
What Are Mullite Bricks Used For?
Used for Various High-temp Industries
Because of its high load softening temperature, low creep rate at high temperatures, good thermal shock resistance and resistance to acid slag erosion, mullite bricks have a wide range of applications in the steel industry, glass industry, ceramic industry, petrochemical industry, non-ferrous metal industry, cement industry, etc.
Used for Various High-temp Furnaces
When it comes to the uses of refractory bricks, we need to understand the special requirements of different high-temperature kilns for refractory bricks. The following are several high-temperature kilns commonly used for mullite bricks:
Mullite Brick Used in Blast Furnace
These bricks are suitable for blast furnaces for lining the hearth and lower stack areas. What’s more, mullite refractory bricks offer excellent thermal resistance, withstanding the intense heat generated by the combustion of coke and the reduction of iron ore. Besides, they provide a durable and heat-resistant lining that can withstand thermal cycling, ensuring the structural integrity of the furnace.
Mullite Brick Used in Hot Blast Furnace
In hot blast furnaces, mullite refractory bricks are suitable for the lining of hot blast furnaces. Furthermore, they are chosen for this application due to their exceptional thermal insulation properties, resistance to thermal shock, and ability to withstand high-temperature combustion gases.
Mullite Brick Used in Glass Furnace
Mullite refractory bricks are used as lining materials in glass melting tanks, and regenerators. Because their high refractoriness and resistance to alkali and acidic environments make them suitable for glass production.
Low Mullite Brick Used in Ceramic Furnace
In ceramic manufacturing processes, the lining material of ceramic furnaces uses mullite refractory bricks. Besides, mullite bricks’ low thermal expansion and high refractoriness make them maintain stable and controlled temperatures within ceramic furnaces, to ensure the uniform heating and cooling of ceramic materials.
Mullite Brick Used in Cement Furnace
In cement manufacturing processes, mullite bricks are used for the lining material of cement furnaces where clinker is heated to produce cement. Moreover, mullite refractory bricks provide excellent thermal insulation, resistance to thermal shock, and durability against the alkaline environment and abrasive materials present during cement production.
Get The Latest Mullite Brick Price from Kerui
As a mullite brick manufacturer, Kerui guarantees that we can provide competitive prices. By purchasing directly from Kerui, customers can benefit from lower prices compared to intermediary companies. Due to market changes, the latest price of mullite bricks may change. For the latest price of mullite bricks, welcome you to contact us for a free quote at any time!
Why Buy Mullite Bricks from Kerui
Advantages of Kerui Mullite Bricks for Sale
At all stages of the mullite brick production process, Kerui conducts a comprehensive product quality inspection. Thus, it ensures that the mullite refractory bricks meet specific performance standards.
Kerui offers cheap refractory brick to meet the unique requirements of customers. For example, this includes variations in dimensions, shapes, and compositions, to meet specific installation needs.
Mullite bricks from Kerui undergo strict quality control measures to ensure our mullite refractory bricks meet industry standards. What’s more, they are manufactured using high-quality raw materials.
Mullite refractory bricks from Kerui have a long service life. Because the combination of high-quality materials and stringent quality control measures ensures they can withstand high temperatures.
Advantages of Kerui Refractory – Top Mullite Bricks Manufacturer in China
Kerui is a genuine mullite brick manufacturer, which ensures cost efficiency and transparency in the supply chain. Meanwhile, Kerui provides high-quality, innovative refractory materials and solutions for industries
Kerui Mullite Bricks Manufacturer has a stable and reliable supply capacity. Meanwhile, with our well-established production capacity, Kerui can meet customer demand for the bricks without compromising on delivery time.
Kerui tries its best to protect the environmental in our production processes. During the production of mullite bricks, desulfurization and denitrification will be carried out. Thus, our mullite bricks meet environmental standards.
Kerui mullite refractory supplies customization options to meet the specific requirements of customers. Moreover, we provide customized solutions in terms of dimensions, shapes, and compositions.
If you have a furnace under construction that requires mullite bricks, please feel free to contact us at any time. We also have a professional sales manager online to help you! More details about Kerui on LinkedIn.