1. Product Composition and Structural Properties
1.1 Alumina Web Content and Crystal Phase Development
( Alumina Lining Bricks)
Alumina lining bricks are dense, crafted refractory porcelains mostly made up of aluminum oxide (Al â‚‚ O TWO), with material commonly varying from 50% to over 99%, straight influencing their performance in high-temperature applications.
The mechanical toughness, rust resistance, and refractoriness of these bricks enhance with higher alumina focus due to the growth of a durable microstructure dominated by the thermodynamically stable α-alumina (corundum) phase.
Throughout production, forerunner products such as calcined bauxite, integrated alumina, or artificial alumina hydrate undergo high-temperature shooting (1400 ° C– 1700 ° C), promoting phase improvement from transitional alumina forms (γ, δ) to α-Al â‚‚ O FIVE, which displays exceptional solidity (9 on the Mohs scale) and melting point (2054 ° C).
The resulting polycrystalline structure contains interlacing diamond grains embedded in a siliceous or aluminosilicate glazed matrix, the structure and quantity of which are thoroughly managed to stabilize thermal shock resistance and chemical resilience.
Minor ingredients such as silica (SiO TWO), titania (TiO TWO), or zirconia (ZrO TWO) may be introduced to change sintering behavior, enhance densification, or boost resistance to particular slags and fluxes.
1.2 Microstructure, Porosity, and Mechanical Honesty
The efficiency of alumina lining bricks is critically dependent on their microstructure, specifically grain size distribution, pore morphology, and bonding phase qualities.
Optimal bricks display fine, uniformly dispersed pores (closed porosity preferred) and very little open porosity (
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