1. Product Make-up and Structural Residence
1.1 Alumina Web Content and Crystal Stage Advancement
( Alumina Lining Bricks)
Alumina lining bricks are dense, crafted refractory porcelains primarily made up of aluminum oxide (Al â‚‚ O TWO), with material typically varying from 50% to over 99%, directly influencing their performance in high-temperature applications.
The mechanical toughness, deterioration resistance, and refractoriness of these bricks raise with higher alumina concentration as a result of the development of a durable microstructure dominated by the thermodynamically steady α-alumina (diamond) stage.
Throughout manufacturing, forerunner products such as calcined bauxite, integrated alumina, or synthetic alumina hydrate go through high-temperature shooting (1400 ° C– 1700 ° C), promoting stage transformation from transitional alumina forms (γ, δ) to α-Al â‚‚ O SIX, which exhibits phenomenal solidity (9 on the Mohs scale) and melting point (2054 ° C).
The resulting polycrystalline framework contains interlocking diamond grains embedded in a siliceous or aluminosilicate glazed matrix, the composition and volume of which are meticulously managed to stabilize thermal shock resistance and chemical durability.
Minor additives such as silica (SiO TWO), titania (TiO TWO), or zirconia (ZrO TWO) might be introduced to change sintering behavior, boost densification, or improve resistance to certain slags and changes.
1.2 Microstructure, Porosity, and Mechanical Honesty
The performance of alumina lining bricks is seriously depending on their microstructure, especially grain size circulation, pore morphology, and bonding stage qualities.
Optimal blocks exhibit great, uniformly distributed pores (closed porosity liked) and marginal open porosity (
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