α-β Corundum Casting Brloks

α-β Corundum Casting Blocks are formed during the the crystallization stage of α-alumina and β-alumina. The compact structure offers an excellent resistance properties to alkali materials. Air bubble and other imputities are rarely found when the bricks directly contacts to the molten glass materials.

Chemical Composition ( % )

RA-M

SiO 2

0.8

Al 2 O 3

95

Na 2 O

3.5

Fe 2 O 3

Tiny

TiO 2

Tiny

Physical Properties

True Density (g/cm 3 )

3.54

Cold Crushing Strength (Mpa)

200

Thermal Expansion Rate ( % )

1000°C

0.7

1500°C

1.09

Bulk Density ( g/cm 3 )

PT

3.2

WS

3.4

Crystalline Phase Composition ( % )

Glass Phase

1

α-Corundum

44

β-Corundum

55

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