1. Product Structure and Structural Feature
1.1 Alumina Content and Crystal Stage Advancement
( Alumina Lining Bricks)
Alumina lining bricks are thick, crafted refractory porcelains largely composed of aluminum oxide (Al two O ₃), with material typically varying from 50% to over 99%, straight influencing their efficiency in high-temperature applications.
The mechanical toughness, deterioration resistance, and refractoriness of these bricks raise with higher alumina focus because of the growth of a durable microstructure controlled by the thermodynamically steady α-alumina (corundum) phase.
Throughout production, precursor materials such as calcined bauxite, fused alumina, or synthetic alumina hydrate undergo high-temperature firing (1400 ° C– 1700 ° C), advertising stage makeover from transitional alumina kinds (γ, δ) to α-Al Two O THREE, which shows remarkable hardness (9 on the Mohs range) and melting factor (2054 ° C).
The resulting polycrystalline framework contains interlacing diamond grains installed in a siliceous or aluminosilicate lustrous matrix, the make-up and volume of which are very carefully regulated to balance thermal shock resistance and chemical sturdiness.
Small ingredients such as silica (SiO TWO), titania (TiO TWO), or zirconia (ZrO TWO) may be presented to modify sintering actions, boost densification, or boost resistance to details slags and fluxes.
1.2 Microstructure, Porosity, and Mechanical Stability
The efficiency of alumina lining bricks is seriously dependent on their microstructure, especially grain dimension distribution, pore morphology, and bonding phase attributes.
Optimum bricks show great, consistently distributed pores (closed porosity favored) and minimal open porosity (
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