1. Material Composition and Structural Properties
1.1 Alumina Material and Crystal Phase Advancement
( Alumina Lining Bricks)
Alumina lining bricks are dense, crafted refractory ceramics mainly made up of light weight aluminum oxide (Al two O FIVE), with content generally varying from 50% to over 99%, directly affecting their efficiency in high-temperature applications.
The mechanical stamina, rust resistance, and refractoriness of these blocks raise with higher alumina concentration as a result of the advancement of a durable microstructure dominated by the thermodynamically stable α-alumina (corundum) stage.
Throughout manufacturing, forerunner materials such as calcined bauxite, integrated alumina, or artificial alumina hydrate undergo high-temperature firing (1400 ° C– 1700 ° C), advertising stage transformation from transitional alumina forms (γ, δ) to α-Al â‚‚ O SIX, which exhibits remarkable solidity (9 on the Mohs scale) and melting factor (2054 ° C).
The resulting polycrystalline framework includes interlacing corundum grains embedded in a siliceous or aluminosilicate lustrous matrix, the make-up and quantity of which are thoroughly regulated to balance thermal shock resistance and chemical toughness.
Small additives such as silica (SiO â‚‚), titania (TiO TWO), or zirconia (ZrO â‚‚) may be presented to modify sintering habits, improve densification, or enhance resistance to specific slags and changes.
1.2 Microstructure, Porosity, and Mechanical Stability
The performance of alumina lining blocks is critically dependent on their microstructure, specifically grain size circulation, pore morphology, and bonding phase attributes.
Optimal bricks exhibit great, consistently distributed pores (shut porosity favored) and minimal open porosity (
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