Corundum brick

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Home > Glass furnace used refractory brick > Corundum brick

Corundum brick

Corundum bricks are refractory products with corundum as the main crystal phase, and the content of Al2O3 is greater than 90%. Their compressive strength at room temperature is high (up to 340 MPa). The load softening onset temperature is high (greater than 1700°C). They have good chemical stability and strong resistance to acidic or alkaline slag, metals and glass melts.

Other name: corundum brick

Model Number: corundum brick

Certification: ISO9001/ISO14001

Minimum Order Quantity: 5MT

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Al2O3/%: 95-98

SiO2/%: 0.15 - 0.5

Fe2O3/%: 0.1 - 0.3

Burnout temperature under load: 1700 MPa

Cold pressing strength: 80 - 100 megapascals

Thermal shock stability is related to the structure. Dense products have good corrosion resistance, but poor thermal shock stability. Corundum bricks come in two types: sintered corundum bricks and fused corundum bricks. Sintered corundum bricks are made from sintered alumina and electro-fused corundum, or from kaolin clinker and sintered alumina with a high Al2O3/SiO2 ratio. They are produced by the sintering method. Un-sintered corundum bricks can also be made using phosphoric acid or other binders.

Advantages of Corundum Bricks

High hardness

The hardness of corundum bricks is extremely high. The hardness of corundum bricks is close to the Mohs hardness of 9, which is harder than steel.

Corrosion resistance

Corundum bricks have strong corrosion resistance to various acids, alkalis and chemical solutions, and can work stably in harsh chemical environments.

High-temperature resistant

The load-softening point of corundum bricks is generally between 1600 and 1800 degrees Celsius, and their refractory temperature can reach 1770 to 2000 degrees Celsius.

Dimensional stability

Corundum bricks have excellent thermal shock resistance and a refractory temperature of no less than 1690 degrees. Their linear expansion coefficient within the temperature range of 20-450 degrees is approximately 0.03 millimeters per degree, allowing them to withstand high-temperature molten static pressure without cracking.

Outstanding heat insulation performance

Corundum bricks are an excellent insulating material that can block current and heat conduction. They are suitable for high-temperature electrical insulation and heat insulation applications.

Good air permeability

The gases that are released from the melt of zirconia-alumina bricks can penetrate through the gaps between the silicon sand particles on the forming wall, thus achieving good air permeability.

The application of corundum bricks

It is used in iron-making blast furnaces and hot air furnaces, external refining furnaces in steelmaking furnaces, sliding water heaters, glass melting furnaces and industrial furnaces in the petrochemical industry.

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