1. Product Make-up and Structural Quality
1.1 Alumina Web Content and Crystal Stage Evolution
( Alumina Lining Bricks)
Alumina lining bricks are thick, engineered refractory porcelains largely made up of aluminum oxide (Al two O FOUR), with material usually ranging from 50% to over 99%, directly affecting their performance in high-temperature applications.
The mechanical stamina, deterioration resistance, and refractoriness of these bricks increase with higher alumina concentration because of the advancement of a robust microstructure dominated by the thermodynamically secure α-alumina (corundum) stage.
During manufacturing, precursor products such as calcined bauxite, fused alumina, or synthetic alumina hydrate undertake high-temperature firing (1400 ° C– 1700 ° C), advertising stage change from transitional alumina forms (γ, δ) to α-Al Two O ₃, which shows exceptional solidity (9 on the Mohs range) and melting factor (2054 ° C).
The resulting polycrystalline framework includes interlacing diamond grains installed in a siliceous or aluminosilicate glassy matrix, the make-up and quantity of which are meticulously regulated to stabilize thermal shock resistance and chemical toughness.
Minor additives such as silica (SiO â‚‚), titania (TiO TWO), or zirconia (ZrO â‚‚) might be presented to modify sintering behavior, improve densification, or boost resistance to details slags and fluxes.
1.2 Microstructure, Porosity, and Mechanical Honesty
The performance of alumina lining blocks is critically depending on their microstructure, specifically grain size circulation, pore morphology, and bonding phase attributes.
Optimal bricks show fine, uniformly dispersed pores (shut porosity liked) and marginal open porosity (
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