1. Material Structure and Structural Characteristic
1.1 Alumina Web Content and Crystal Phase Development
( Alumina Lining Bricks)
Alumina lining bricks are thick, crafted refractory ceramics mainly made up of aluminum oxide (Al ₂ O ₃), with content generally ranging from 50% to over 99%, straight influencing their efficiency in high-temperature applications.
The mechanical toughness, corrosion resistance, and refractoriness of these bricks boost with greater alumina focus because of the growth of a durable microstructure dominated by the thermodynamically secure α-alumina (diamond) phase.
During production, forerunner products such as calcined bauxite, fused alumina, or artificial alumina hydrate undertake high-temperature firing (1400 ° C– 1700 ° C), promoting phase transformation from transitional alumina kinds (γ, δ) to α-Al â‚‚ O FIVE, which displays remarkable firmness (9 on the Mohs range) and melting point (2054 ° C).
The resulting polycrystalline structure contains interlacing corundum grains embedded in a siliceous or aluminosilicate lustrous matrix, the structure and volume of which are very carefully controlled to stabilize thermal shock resistance and chemical longevity.
Minor ingredients such as silica (SiO â‚‚), titania (TiO â‚‚), or zirconia (ZrO â‚‚) might be presented to change sintering habits, enhance densification, or boost resistance to particular slags and fluxes.
1.2 Microstructure, Porosity, and Mechanical Stability
The efficiency of alumina lining blocks is critically based on their microstructure, particularly grain size distribution, pore morphology, and bonding phase qualities.
Ideal bricks exhibit fine, consistently distributed pores (shut porosity favored) and minimal open porosity (
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