1. Material Make-up and Structural Characteristic
1.1 Alumina Content and Crystal Phase Advancement
( Alumina Lining Bricks)
Alumina lining blocks are dense, crafted refractory porcelains mostly made up of aluminum oxide (Al two O FOUR), with content generally ranging from 50% to over 99%, straight influencing their performance in high-temperature applications.
The mechanical stamina, deterioration resistance, and refractoriness of these blocks raise with greater alumina focus because of the advancement of a durable microstructure controlled by the thermodynamically secure α-alumina (corundum) stage.
Throughout manufacturing, precursor materials such as calcined bauxite, fused alumina, or synthetic alumina hydrate undergo high-temperature shooting (1400 ° C– 1700 ° C), advertising stage makeover from transitional alumina kinds (γ, δ) to α-Al Two O ₃, which exhibits phenomenal solidity (9 on the Mohs scale) and melting point (2054 ° C).
The resulting polycrystalline framework includes interlocking diamond grains installed in a siliceous or aluminosilicate glazed matrix, the structure and volume of which are carefully controlled to stabilize thermal shock resistance and chemical toughness.
Small additives such as silica (SiO TWO), titania (TiO ₂), or zirconia (ZrO TWO) may be presented to change sintering habits, improve densification, or improve resistance to certain slags and fluxes.
1.2 Microstructure, Porosity, and Mechanical Honesty
The performance of alumina lining blocks is critically dependent on their microstructure, especially grain size distribution, pore morphology, and bonding phase qualities.
Optimum blocks show fine, evenly distributed pores (closed porosity liked) and minimal open porosity (
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