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Fused cast corundum block

Fused cast corundum block is composed of high-purity alumina and does not cause contamination to glass melt. It is usually used in the furnaces for high-grade glass products, such as float glass furnace, technical glass etc.

Other name: α,β,α-β alumina block, alumina brick

Model Number: α corundum block, β corundum block, α-β corundum block

Certification: ISO 9001-14001

Minimum Order Quantity: 5 MT

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Fused cast corundum block

Description:

Fused cast corundum block is obtained by melting the alumina in an electric arc furnace and casting it into a specified specific shape model, and annealing and holding it, and then processing through the diamond abrasive tool to obtain a desired product. The product is classified into three types according to the difference in the crystal form of alumina. α corundum blockk is α-Al2O3 as the main crystal phase; α-β corundum block is α-Al2O3 and β-Al2O3 crystal phase are mainly, and their content is basically 1:1, the α phase content is slightly higher; β corundum block is β-Al2O3 as the main crystal phase.

Advantages:

High refractoriness under load, high strength, high resistance to glass melt erosion, not polluting glass melt

Application:

Feeder channel of float glass furnace, working tank, refiner bottom, melter bottom


Fused cast corundum block physical and chemical

Itemα-corundumβ-corundumα-β corundum
Chemical CompositionAl₂O₃ %98.5≥ 92≥ 95
SiO₂ %0.4≤ 0.5≤ 0.5
Na₂O %0.95.5-7.53.2-4.5
Crystalline Phaseα-corundum90-95-40-50
β-corundum5-10> 97.550-60
Glass   phase0-1< 1≤ 2
Bulk Density g/cm³ (WS)≥ 3.6≥ 2.9≥ 3.4
Cold Crushing Strength Mpa≥ 250≥ 30≥ 200
Therm.Exp (1000℃) %0.880.650.7
Therm.Exp (1500℃) %1.321.011.09




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