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1. Material Composition and Structural Residence
1.1 Alumina Web Content and Crystal Phase Evolution
( Alumina Lining Bricks)
Alumina lining blocks are dense, engineered refractory porcelains mainly composed of light weight aluminum oxide (Al two O ₃), with web content generally ranging from 50% to over 99%, directly influencing their performance in high-temperature applications.
The mechanical stamina, deterioration resistance, and refractoriness of these bricks boost with greater alumina focus as a result of the advancement of a durable microstructure controlled by the thermodynamically steady α-alumina (corundum) stage.
Throughout manufacturing, precursor materials such as calcined bauxite, fused alumina, or artificial alumina hydrate undergo high-temperature shooting (1400 ° C– 1700 ° C), promoting phase change from transitional alumina kinds (γ, δ) to α-Al ₂ O ₃, which exhibits outstanding hardness (9 on the Mohs scale) and melting point (2054 ° C).
The resulting polycrystalline structure contains interlocking diamond grains installed in a siliceous or aluminosilicate glazed matrix, the make-up and quantity of which are carefully regulated to balance thermal shock resistance and chemical durability.
Small additives such as silica (SiO ₂), titania (TiO ₂), or zirconia (ZrO TWO) may be introduced to customize sintering behavior, boost densification, or improve resistance to certain slags and changes.
1.2 Microstructure, Porosity, and Mechanical Integrity
The efficiency of alumina lining bricks is critically depending on their microstructure, specifically grain dimension distribution, pore morphology, and bonding stage attributes.
Optimal blocks display great, uniformly dispersed pores (shut porosity favored) and marginal open porosity (
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Tags: Alumina Lining Bricks, alumina, alumina oxide
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