1. Material Structure and Structural Residence
1.1 Alumina Content and Crystal Stage Development
( Alumina Lining Bricks)
Alumina lining bricks are thick, crafted refractory porcelains mostly made up of aluminum oxide (Al ₂ O ₃), with material normally varying from 50% to over 99%, directly affecting their efficiency in high-temperature applications.
The mechanical toughness, deterioration resistance, and refractoriness of these blocks enhance with greater alumina concentration because of the advancement of a durable microstructure dominated by the thermodynamically secure α-alumina (diamond) phase.
Throughout manufacturing, forerunner materials such as calcined bauxite, merged alumina, or synthetic alumina hydrate undertake high-temperature firing (1400 ° C– 1700 ° C), advertising stage change from transitional alumina forms (γ, δ) to α-Al â‚‚ O ₃, which shows phenomenal solidity (9 on the Mohs scale) and melting point (2054 ° C).
The resulting polycrystalline structure contains interlocking corundum grains embedded in a siliceous or aluminosilicate lustrous matrix, the make-up and quantity of which are meticulously controlled to stabilize thermal shock resistance and chemical longevity.
Minor additives such as silica (SiO â‚‚), titania (TiO â‚‚), or zirconia (ZrO TWO) might be presented to change sintering behavior, enhance densification, or enhance resistance to specific slags and fluxes.
1.2 Microstructure, Porosity, and Mechanical Integrity
The performance of alumina lining bricks is critically dependent on their microstructure, especially grain size circulation, pore morphology, and bonding stage features.
Optimal blocks display fine, consistently distributed pores (shut porosity favored) and very little open porosity (
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