1. Material Make-up and Structural Characteristic
1.1 Alumina Material and Crystal Phase Advancement
( Alumina Lining Bricks)
Alumina lining bricks are dense, crafted refractory porcelains largely made up of aluminum oxide (Al â‚‚ O SIX), with content normally varying from 50% to over 99%, directly influencing their efficiency in high-temperature applications.
The mechanical stamina, corrosion resistance, and refractoriness of these bricks boost with higher alumina focus as a result of the development of a durable microstructure dominated by the thermodynamically secure α-alumina (corundum) stage.
During manufacturing, precursor materials such as calcined bauxite, integrated alumina, or synthetic alumina hydrate go through high-temperature shooting (1400 ° C– 1700 ° C), advertising stage transformation from transitional alumina kinds (γ, δ) to α-Al Two O FIVE, which displays phenomenal solidity (9 on the Mohs range) and melting point (2054 ° C).
The resulting polycrystalline structure includes interlocking diamond grains installed in a siliceous or aluminosilicate lustrous matrix, the composition and quantity of which are very carefully controlled to stabilize thermal shock resistance and chemical toughness.
Minor ingredients such as silica (SiO â‚‚), titania (TiO â‚‚), or zirconia (ZrO â‚‚) may be introduced to customize sintering actions, enhance densification, or improve resistance to certain slags and fluxes.
1.2 Microstructure, Porosity, and Mechanical Honesty
The performance of alumina lining blocks is seriously dependent on their microstructure, particularly grain dimension distribution, pore morphology, and bonding stage attributes.
Ideal blocks show fine, consistently distributed pores (closed porosity liked) and minimal open porosity (
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