1. Material Structure and Structural Feature
1.1 Alumina Material and Crystal Stage Evolution
( Alumina Lining Bricks)
Alumina lining bricks are dense, crafted refractory ceramics largely composed of aluminum oxide (Al ₂ O TWO), with content usually varying from 50% to over 99%, directly influencing their efficiency in high-temperature applications.
The mechanical stamina, deterioration resistance, and refractoriness of these blocks enhance with greater alumina focus as a result of the development of a robust microstructure dominated by the thermodynamically secure α-alumina (diamond) phase.
During production, forerunner products such as calcined bauxite, integrated alumina, or artificial alumina hydrate go through high-temperature firing (1400 ° C– 1700 ° C), advertising stage makeover from transitional alumina types (γ, δ) to α-Al ₂ O FOUR, which shows phenomenal firmness (9 on the Mohs range) and melting factor (2054 ° C).
The resulting polycrystalline structure contains interlacing diamond grains installed in a siliceous or aluminosilicate glassy matrix, the composition and volume of which are very carefully regulated to balance thermal shock resistance and chemical durability.
Small additives such as silica (SiO ₂), titania (TiO ₂), or zirconia (ZrO ₂) might be introduced to modify sintering habits, enhance densification, or boost resistance to certain slags and fluxes.
1.2 Microstructure, Porosity, and Mechanical Integrity
The performance of alumina lining bricks is critically dependent on their microstructure, especially grain size circulation, pore morphology, and bonding phase characteristics.
Optimal blocks exhibit fine, consistently distributed pores (closed porosity chosen) and minimal open porosity (
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