1. Product Structure and Structural Residence
1.1 Alumina Material and Crystal Stage Evolution
( Alumina Lining Bricks)
Alumina lining bricks are dense, engineered refractory ceramics mostly made up of light weight aluminum oxide (Al two O FIVE), with web content typically varying from 50% to over 99%, straight affecting their performance in high-temperature applications.
The mechanical toughness, rust resistance, and refractoriness of these bricks increase with greater alumina focus due to the advancement of a durable microstructure dominated by the thermodynamically stable α-alumina (diamond) stage.
During manufacturing, precursor materials such as calcined bauxite, fused alumina, or synthetic alumina hydrate undertake high-temperature shooting (1400 ° C– 1700 ° C), promoting stage change from transitional alumina types (γ, δ) to α-Al â‚‚ O TWO, which exhibits extraordinary firmness (9 on the Mohs scale) and melting factor (2054 ° C).
The resulting polycrystalline structure contains interlocking corundum grains embedded in a siliceous or aluminosilicate glazed matrix, the composition and quantity of which are very carefully regulated to stabilize thermal shock resistance and chemical toughness.
Minor ingredients such as silica (SiO â‚‚), titania (TiO â‚‚), or zirconia (ZrO â‚‚) may be introduced to customize sintering behavior, improve densification, or boost resistance to particular slags and fluxes.
1.2 Microstructure, Porosity, and Mechanical Honesty
The performance of alumina lining bricks is seriously based on their microstructure, specifically grain size distribution, pore morphology, and bonding stage qualities.
Optimal blocks exhibit fine, evenly distributed pores (closed porosity favored) and marginal open porosity (
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