1. Product Structure and Structural Feature
1.1 Alumina Web Content and Crystal Phase Evolution
( Alumina Lining Bricks)
Alumina lining bricks are dense, crafted refractory ceramics mostly made up of aluminum oxide (Al two O TWO), with content generally varying from 50% to over 99%, directly influencing their efficiency in high-temperature applications.
The mechanical toughness, corrosion resistance, and refractoriness of these blocks raise with greater alumina concentration due to the advancement of a robust microstructure dominated by the thermodynamically stable α-alumina (diamond) stage.
Throughout production, forerunner materials such as calcined bauxite, merged alumina, or synthetic alumina hydrate undertake high-temperature shooting (1400 ° C– 1700 ° C), advertising stage makeover from transitional alumina kinds (γ, δ) to α-Al ₂ O SIX, which shows outstanding solidity (9 on the Mohs range) and melting factor (2054 ° C).
The resulting polycrystalline framework consists of interlocking corundum grains installed in a siliceous or aluminosilicate glassy matrix, the structure and quantity of which are carefully controlled to balance thermal shock resistance and chemical sturdiness.
Minor ingredients such as silica (SiO ₂), titania (TiO ₂), or zirconia (ZrO TWO) might be presented to change sintering actions, improve densification, or enhance resistance to specific slags and fluxes.
1.2 Microstructure, Porosity, and Mechanical Stability
The efficiency of alumina lining bricks is seriously depending on their microstructure, particularly grain size circulation, pore morphology, and bonding stage qualities.
Optimal bricks display fine, evenly distributed pores (closed porosity liked) and marginal open porosity (
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