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1. Material Make-up and Structural Properties
1.1 Alumina Web Content and Crystal Stage Evolution
( Alumina Lining Bricks)
Alumina lining bricks are thick, engineered refractory ceramics primarily composed of light weight aluminum oxide (Al two O THREE), with content usually varying from 50% to over 99%, straight influencing their performance in high-temperature applications.
The mechanical strength, deterioration resistance, and refractoriness of these bricks increase with higher alumina concentration as a result of the advancement of a durable microstructure dominated by the thermodynamically secure α-alumina (diamond) stage.
During production, forerunner materials such as calcined bauxite, fused alumina, or artificial alumina hydrate go through high-temperature shooting (1400 ° C– 1700 ° C), advertising phase makeover from transitional alumina kinds (γ, δ) to α-Al ₂ O SIX, which exhibits extraordinary hardness (9 on the Mohs range) and melting point (2054 ° C).
The resulting polycrystalline framework contains interlacing diamond grains embedded in a siliceous or aluminosilicate glassy matrix, the make-up and quantity of which are carefully controlled to balance thermal shock resistance and chemical resilience.
Minor ingredients such as silica (SiO ₂), titania (TiO ₂), or zirconia (ZrO ₂) might be presented to modify sintering habits, enhance densification, or improve resistance to specific slags and changes.
1.2 Microstructure, Porosity, and Mechanical Stability
The performance of alumina lining blocks is critically depending on their microstructure, especially grain dimension distribution, pore morphology, and bonding phase characteristics.
Optimum blocks exhibit fine, uniformly distributed pores (shut porosity favored) and very little open porosity (
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