1. Material Composition and Structural Characteristic
1.1 Alumina Material and Crystal Phase Development
( Alumina Lining Bricks)
Alumina lining blocks are thick, crafted refractory ceramics largely made up of light weight aluminum oxide (Al two O SIX), with content generally varying from 50% to over 99%, directly influencing their performance in high-temperature applications.
The mechanical toughness, rust resistance, and refractoriness of these bricks increase with higher alumina concentration due to the advancement of a robust microstructure dominated by the thermodynamically secure α-alumina (diamond) stage.
Throughout production, precursor 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 types (γ, δ) to α-Al Two O FOUR, which displays exceptional hardness (9 on the Mohs range) and melting point (2054 ° C).
The resulting polycrystalline structure includes interlocking corundum grains installed in a siliceous or aluminosilicate lustrous matrix, the composition and quantity of which are meticulously managed to balance thermal shock resistance and chemical toughness.
Minor additives such as silica (SiO â‚‚), titania (TiO â‚‚), or zirconia (ZrO TWO) might be introduced to modify sintering habits, improve densification, or improve resistance to certain slags and fluxes.
1.2 Microstructure, Porosity, and Mechanical Honesty
The efficiency of alumina lining blocks is critically dependent on their microstructure, especially grain size circulation, pore morphology, and bonding phase qualities.
Optimal bricks exhibit fine, consistently distributed pores (closed porosity liked) and marginal open porosity (
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