1. Material Structure and Structural Properties
1.1 Alumina Web Content and Crystal Phase Development
( Alumina Lining Bricks)
Alumina lining blocks are dense, engineered refractory porcelains primarily composed of aluminum oxide (Al â‚‚ O SIX), with content commonly varying from 50% to over 99%, straight affecting their performance in high-temperature applications.
The mechanical toughness, deterioration resistance, and refractoriness of these blocks raise with higher alumina concentration because of the advancement of a durable microstructure controlled by the thermodynamically steady α-alumina (corundum) stage.
During production, forerunner materials such as calcined bauxite, fused alumina, or synthetic alumina hydrate undertake high-temperature shooting (1400 ° C– 1700 ° C), promoting phase change from transitional alumina kinds (γ, δ) to α-Al â‚‚ O TWO, which shows phenomenal firmness (9 on the Mohs scale) and melting point (2054 ° C).
The resulting polycrystalline framework contains interlocking corundum grains installed in a siliceous or aluminosilicate lustrous matrix, the composition and volume of which are meticulously managed to stabilize thermal shock resistance and chemical toughness.
Minor ingredients such as silica (SiO TWO), titania (TiO â‚‚), or zirconia (ZrO â‚‚) might be introduced to customize sintering actions, enhance densification, or improve resistance to details slags and fluxes.
1.2 Microstructure, Porosity, and Mechanical Integrity
The performance of alumina lining blocks is seriously based on their microstructure, especially grain size circulation, pore morphology, and bonding stage features.
Ideal blocks show great, consistently dispersed pores (shut porosity liked) and very little open porosity (
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