1. Product Composition and Structural Feature
1.1 Alumina Material and Crystal Stage Development
( Alumina Lining Bricks)
Alumina lining bricks are thick, engineered refractory ceramics mainly made up of aluminum oxide (Al ₂ O SIX), with material typically varying from 50% to over 99%, straight affecting their performance in high-temperature applications.
The mechanical strength, deterioration resistance, and refractoriness of these blocks increase with higher alumina concentration as a result of the advancement of a durable microstructure controlled by the thermodynamically steady α-alumina (corundum) stage.
Throughout manufacturing, forerunner materials such as calcined bauxite, integrated alumina, or synthetic alumina hydrate undertake high-temperature shooting (1400 ° C– 1700 ° C), promoting stage makeover from transitional alumina forms (γ, δ) to α-Al Two O THREE, which displays extraordinary solidity (9 on the Mohs range) and melting point (2054 ° C).
The resulting polycrystalline structure contains interlocking diamond grains embedded in a siliceous or aluminosilicate glassy matrix, the make-up and volume of which are meticulously controlled to balance thermal shock resistance and chemical longevity.
Minor ingredients such as silica (SiO TWO), titania (TiO ₂), or zirconia (ZrO TWO) might be introduced to customize sintering actions, boost densification, or boost resistance to particular slags and fluxes.
1.2 Microstructure, Porosity, and Mechanical Integrity
The performance of alumina lining bricks is critically depending on their microstructure, specifically grain size circulation, pore morphology, and bonding stage attributes.
Optimal blocks exhibit fine, evenly dispersed pores (shut porosity liked) and minimal open porosity (
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