1. Product Structure and Structural Characteristic
1.1 Alumina Web Content and Crystal Phase Evolution
( Alumina Lining Bricks)
Alumina lining bricks are thick, crafted refractory ceramics primarily composed of aluminum oxide (Al two O FOUR), with material typically varying from 50% to over 99%, directly affecting their efficiency in high-temperature applications.
The mechanical toughness, deterioration resistance, and refractoriness of these bricks increase with higher alumina concentration because of the advancement of a robust microstructure dominated by the thermodynamically stable α-alumina (corundum) stage.
During manufacturing, forerunner materials such as calcined bauxite, merged alumina, or artificial alumina hydrate undergo high-temperature firing (1400 ° C– 1700 ° C), promoting stage transformation from transitional alumina forms (γ, δ) to α-Al â‚‚ O SIX, which exhibits extraordinary hardness (9 on the Mohs scale) and melting point (2054 ° C).
The resulting polycrystalline structure contains interlocking corundum grains embedded in a siliceous or aluminosilicate glassy matrix, the make-up and quantity of which are very carefully regulated to stabilize thermal shock resistance and chemical resilience.
Minor additives such as silica (SiO â‚‚), titania (TiO TWO), or zirconia (ZrO â‚‚) may be introduced to customize sintering actions, boost densification, or boost resistance to particular slags and fluxes.
1.2 Microstructure, Porosity, and Mechanical Honesty
The efficiency of alumina lining bricks is seriously based on their microstructure, particularly grain size distribution, pore morphology, and bonding phase attributes.
Optimal blocks display great, uniformly distributed pores (shut porosity chosen) and marginal open porosity (
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