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1. Material Composition and Structural Residence
1.1 Alumina Material and Crystal Stage Evolution
( Alumina Lining Bricks)
Alumina lining bricks are thick, engineered refractory ceramics mainly made up of aluminum oxide (Al two O ₃), with content typically varying from 50% to over 99%, straight affecting their performance in high-temperature applications.
The mechanical strength, rust resistance, and refractoriness of these blocks boost with higher alumina concentration due to the growth of a durable microstructure controlled by the thermodynamically secure α-alumina (corundum) phase.
Throughout manufacturing, forerunner materials such as calcined bauxite, fused alumina, or artificial alumina hydrate undergo high-temperature shooting (1400 ° C– 1700 ° C), promoting stage transformation from transitional alumina kinds (γ, δ) to α-Al ₂ O ₃, which exhibits remarkable firmness (9 on the Mohs range) and melting factor (2054 ° C).
The resulting polycrystalline framework consists of interlacing diamond grains embedded in a siliceous or aluminosilicate lustrous matrix, the composition and volume of which are thoroughly regulated to stabilize thermal shock resistance and chemical toughness.
Minor additives such as silica (SiO ₂), titania (TiO TWO), or zirconia (ZrO TWO) may be presented to modify sintering actions, enhance densification, or boost resistance to particular slags and changes.
1.2 Microstructure, Porosity, and Mechanical Integrity
The performance of alumina lining bricks is seriously based on their microstructure, particularly grain dimension circulation, pore morphology, and bonding phase characteristics.
Optimal blocks exhibit great, uniformly dispersed pores (closed porosity liked) and very little open porosity (
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