1. Material Composition and Structural Feature
1.1 Alumina Web Content and Crystal Phase Advancement
( Alumina Lining Bricks)
Alumina lining bricks are dense, engineered refractory porcelains primarily composed of aluminum oxide (Al two O FIVE), with content normally ranging from 50% to over 99%, directly affecting their efficiency in high-temperature applications.
The mechanical strength, deterioration resistance, and refractoriness of these blocks increase with higher alumina concentration because of the development of a durable microstructure dominated by the thermodynamically stable α-alumina (corundum) phase.
During production, precursor products such as calcined bauxite, merged alumina, or synthetic alumina hydrate undergo high-temperature firing (1400 ° C– 1700 ° C), advertising phase improvement from transitional alumina types (γ, δ) to α-Al Two O FIVE, which displays phenomenal solidity (9 on the Mohs scale) and melting factor (2054 ° C).
The resulting polycrystalline structure contains interlacing corundum grains installed in a siliceous or aluminosilicate glazed matrix, the structure and volume of which are carefully regulated to balance thermal shock resistance and chemical toughness.
Small ingredients such as silica (SiO â‚‚), titania (TiO â‚‚), or zirconia (ZrO TWO) might be introduced to change sintering habits, improve densification, or boost resistance to certain slags and changes.
1.2 Microstructure, Porosity, and Mechanical Stability
The efficiency of alumina lining blocks is critically depending on their microstructure, especially grain size distribution, pore morphology, and bonding stage characteristics.
Optimum bricks display great, evenly distributed pores (shut porosity favored) and very little open porosity (
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