1. Product Make-up and Structural Characteristic
1.1 Alumina Material and Crystal Phase Development
( Alumina Lining Bricks)
Alumina lining bricks are dense, crafted refractory ceramics primarily composed of aluminum oxide (Al ₂ O FIVE), with material commonly ranging from 50% to over 99%, straight influencing their efficiency in high-temperature applications.
The mechanical strength, corrosion resistance, and refractoriness of these bricks enhance with greater alumina concentration due to the growth of a durable microstructure controlled by the thermodynamically secure α-alumina (corundum) phase.
During manufacturing, forerunner products such as calcined bauxite, integrated alumina, or synthetic alumina hydrate undergo high-temperature shooting (1400 ° C– 1700 ° C), advertising stage makeover from transitional alumina forms (γ, δ) to α-Al Two O TWO, which displays remarkable solidity (9 on the Mohs scale) and melting factor (2054 ° C).
The resulting polycrystalline framework consists of interlocking diamond grains installed in a siliceous or aluminosilicate glassy matrix, the make-up and volume of which are very carefully managed to stabilize thermal shock resistance and chemical resilience.
Small additives such as silica (SiO ₂), titania (TiO TWO), or zirconia (ZrO ₂) might be presented to modify sintering actions, boost densification, or enhance resistance to specific slags and fluxes.
1.2 Microstructure, Porosity, and Mechanical Integrity
The performance of alumina lining blocks is critically based on their microstructure, particularly grain dimension circulation, pore morphology, and bonding stage attributes.
Ideal blocks exhibit great, evenly distributed pores (shut porosity preferred) and minimal open porosity (
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