Alumina Bubble Brick

Alumina Bubble Brick

Alumina hollow ball bricks are made of alumina hollow spheres and alumina powder as the main raw materials, combined with other binders, and fired at a high temperature of 1750 degrees. It is a kind of energy-saving insulation material for ultra-high temperature materials....

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A lightweight refractory product mainly composed of corundum containing more than 90% Al2O3. If it can be used, -Al2O3 and an appropriate amount of clay and binder as raw materials, prepared by adding a gas foaming agent. The product has good high temperature structural properties and can be used in industrial furnaces from 1600 to 1800 °C.

Alumina bubble brick is made from alumina bubbles and alumina powders, together with other adhesives, burnt by 1750℃. It belongs to the super high temperature thermal insulation material which is widely used as the industrial furnace lining under 1800 ℃ . Since its high porosity, it cannot be applied to the part that contact slag, or it will be damaged by the slag permeation. Also if used as the furnace lining, the temperature rising rate cannot be too sharp, or it will crack and reduce its service life.

Features

● Thermal stability

● Low thermal conductivity

● High porosity

● High refractoriness under load

● Low thermal linear change

Applications

● Metallurgy induction furnace lining

● Petrochemical industrial

● gas furnace

● Thermal insulation lining

● Reaction Furnace lining

Items

Alumina Bubble Bricks

Classification Temperature(℃)

1800

1700

Density  ( g/cm3)

1.2-1.6

1.2-1.6

Permanent Linear Change (℃×hr%)

1800×4≤0.3

1700×4≤0.3

Cold crushing Strength(MPa)

15

16

Modulus of Rupture (MPa)

60-70

60-70

Thermal Conductivity 350℃±20℃(w/m.k)

0.6-0.9

0.6-1.0

Refractoriness under load(℃)

1750

1650

Thermal shock resistance ℃ times

1100 Times >20

15

Chemical composites( %)

Al2O3≥

98.5

85

Fe2O3≤

0.1

0.1

SiO2

0.2

15

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