1. Material Make-up and Structural Properties
1.1 Alumina Content and Crystal Stage Advancement
( Alumina Lining Bricks)
Alumina lining blocks are dense, crafted refractory porcelains primarily composed of light weight aluminum oxide (Al â‚‚ O FIVE), with content usually varying from 50% to over 99%, straight influencing their performance in high-temperature applications.
The mechanical stamina, corrosion resistance, and refractoriness of these bricks increase with greater alumina concentration as a result of the development of a robust microstructure dominated by the thermodynamically secure α-alumina (corundum) stage.
During manufacturing, forerunner materials such as calcined bauxite, fused alumina, or artificial alumina hydrate go through high-temperature firing (1400 ° C– 1700 ° C), advertising phase transformation from transitional alumina kinds (γ, δ) to α-Al â‚‚ O FIVE, which shows exceptional firmness (9 on the Mohs scale) and melting point (2054 ° C).
The resulting polycrystalline structure consists of interlocking diamond grains embedded in a siliceous or aluminosilicate glassy matrix, the composition and volume of which are meticulously controlled to balance thermal shock resistance and chemical longevity.
Small ingredients such as silica (SiO TWO), titania (TiO â‚‚), or zirconia (ZrO â‚‚) may be introduced to modify sintering habits, enhance densification, or improve resistance to certain slags and changes.
1.2 Microstructure, Porosity, and Mechanical Honesty
The efficiency of alumina lining bricks is critically based on their microstructure, especially grain size circulation, pore morphology, and bonding stage qualities.
Ideal bricks exhibit fine, uniformly dispersed pores (closed porosity preferred) and marginal open porosity (
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