1. Material Structure and Structural Feature
1.1 Alumina Content and Crystal Phase Development
( Alumina Lining Bricks)
Alumina lining bricks are dense, crafted refractory ceramics primarily made up of aluminum oxide (Al ₂ O THREE), with material normally varying from 50% to over 99%, directly affecting their performance in high-temperature applications.
The mechanical strength, deterioration resistance, and refractoriness of these bricks boost with greater alumina concentration because of the growth of a robust microstructure controlled by the thermodynamically stable α-alumina (corundum) phase.
During manufacturing, precursor materials such as calcined bauxite, merged alumina, or artificial alumina hydrate undertake high-temperature firing (1400 ° C– 1700 ° C), advertising stage change from transitional alumina forms (γ, δ) to α-Al ₂ O THREE, which shows outstanding firmness (9 on the Mohs scale) and melting point (2054 ° C).
The resulting polycrystalline structure contains interlocking corundum grains installed in a siliceous or aluminosilicate glazed matrix, the make-up and quantity of which are thoroughly managed to stabilize thermal shock resistance and chemical toughness.
Minor additives such as silica (SiO ₂), titania (TiO TWO), or zirconia (ZrO TWO) may be introduced to modify sintering habits, improve densification, or boost resistance to certain slags and fluxes.
1.2 Microstructure, Porosity, and Mechanical Integrity
The performance of alumina lining bricks is critically dependent on their microstructure, particularly grain dimension circulation, pore morphology, and bonding stage characteristics.
Optimal bricks display great, consistently dispersed pores (closed porosity favored) and marginal open porosity (
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