1. Product Structure and Structural Properties
1.1 Alumina Web Content and Crystal Phase Development
( Alumina Lining Bricks)
Alumina lining bricks are thick, engineered refractory porcelains mostly made up of light weight aluminum oxide (Al â‚‚ O SIX), with material generally varying from 50% to over 99%, directly influencing their efficiency in high-temperature applications.
The mechanical strength, rust resistance, and refractoriness of these bricks boost with higher alumina concentration as a result of the growth of a durable microstructure dominated by the thermodynamically stable α-alumina (corundum) stage.
Throughout production, forerunner products such as calcined bauxite, merged alumina, or artificial alumina hydrate undertake high-temperature firing (1400 ° C– 1700 ° C), promoting stage transformation from transitional alumina kinds (γ, δ) to α-Al â‚‚ O TWO, which shows exceptional solidity (9 on the Mohs scale) and melting point (2054 ° C).
The resulting polycrystalline framework contains interlacing corundum grains embedded in a siliceous or aluminosilicate glazed matrix, the composition and quantity of which are carefully regulated to balance thermal shock resistance and chemical toughness.
Small ingredients such as silica (SiO TWO), titania (TiO â‚‚), or zirconia (ZrO TWO) might be introduced to modify sintering habits, boost densification, or improve resistance to particular slags and changes.
1.2 Microstructure, Porosity, and Mechanical Honesty
The performance of alumina lining blocks is seriously depending on their microstructure, specifically grain dimension distribution, pore morphology, and bonding stage features.
Ideal bricks exhibit great, evenly dispersed pores (shut porosity preferred) and marginal open porosity (
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