Corundum Brick

Product Details

Alumina bricks generally refer to Alumina silicate bricks, with Al2O3 and SiO2 contents as main contents, and Fe2O3, Na2O, K2O, TiO2 as impurities.

With different Al2O3 contents, alumina bricks include fire clay bricks(Al2O3 content within 48% with Kaolin as raw material), high alumina bricks (Al2O3 content 48%-85%, with bauxite as raw material), dense mullite bricks, silimanite bricks, corundum bricks(Al2O3 content over 90% with corundum as raw materials) etc.

Technical data of alumina bricks generally include chemical composition(content of Al2O3 and Fe2O3), bulk density, apparent porosity, cold crushing strength, permanent liner change and refractoriness under load 0.2 MPa.

With higher Al2O3 content, bricks are with

Less impurities

better thermal resistance

Higher crushing strength

Better corrosion resistance

Less permanent liner change

More stable performance

But thermal shock resistance of corumdum bricks are weaker than high alumina bricks and mullite bricks, so bricks with higher Al2O3 content are generally used as working lining of furnaces, kilns and boiler with stable temperature.

Producing process: Grinding of raw material--Batching-- Shaping with hydraulic press-- firing in tunnel kilns--- inspection and packaging in warehouse

Corundum & Corundum Mullite Bricks

Corundum & Corundum Mullite Bricks are high alumina refractory bricks for application in extreme conditions. The alumina content is primarily achieved by using pure synthetic types of corundum, such as white corundum and tabular alumina. Special refractory clays, special clays and pure silicilic acid modifications characterize the bond.
Through product-specific and format-specific high temperature firing, the corundum bricks have a high temperature-resistant mullite bond, a mullite-corundum bond or a pure corundum bond.
The application temperatures reach 1700°C for the mullite bond and up to 1800°C for corundum bond bricks, such as AL-95. The range of applications of the bricks covers almost all industrial sectors where high temperature processes are used and in which increased resistance to aggressive slags and atmospheres, as well as lot hot pressure flow and good thermal shock resistance are required.

Silimanite and Andalusite Bricks

Non contaminated andalusite from natural sources forms the raw material for these bricks. Shaping takes place by hydraulic high pressure presses by vibration casting or slip casting. Andalusite grades with excellent pressure flow behaviour, at particularly high temperatures, and an excellent thermal shock resistance are achieved by especially designed bonds and defined and optimized firing.
Hot-blast stoves (cowper and burner blocks) are preferred areas of application for these low-iron bricks, together with special products with very good thermodynamic and corrosion resistant characteristics for glass melters, and for areas with medium temperature in thermal re-generators, fore-hearth covers and feeder expendables.
Special bricks with specific chemical bonding have been developed and proven themselves in application areas of high thermal and mechanical stress, such as in hazardous waste incinerators and combustion chambers.

Mullite Bricks

Mullite bricks, based on synthetic fused mullite and sintered mullite, are manufactured by selected shaping processes and fired in high temperature furnaces. Mullite bricks are preferred for high thermal stress applications, such as at the hot end of regenerative chambers of glass melters, in the superstructure of the furnace, and in particular in the arch of glass fibre melters, due to their excellent thermal properties and adequate corrosion resistance.

Product Data

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