1. Material Make-up and Structural Characteristic
1.1 Alumina Content and Crystal Stage Advancement
( Alumina Lining Bricks)
Alumina lining blocks are thick, crafted refractory porcelains primarily composed of light weight aluminum oxide (Al â‚‚ O SIX), with material commonly ranging from 50% to over 99%, directly affecting their efficiency in high-temperature applications.
The mechanical toughness, corrosion resistance, and refractoriness of these blocks boost with greater alumina concentration because of the advancement of a robust microstructure dominated by the thermodynamically secure α-alumina (diamond) stage.
During production, forerunner products such as calcined bauxite, merged alumina, or artificial alumina hydrate undergo high-temperature firing (1400 ° C– 1700 ° C), advertising stage change from transitional alumina kinds (γ, δ) to α-Al Two O ₃, which shows extraordinary hardness (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 glazed matrix, the make-up and quantity of which are thoroughly regulated to stabilize thermal shock resistance and chemical resilience.
Minor additives such as silica (SiO TWO), titania (TiO â‚‚), or zirconia (ZrO TWO) might be introduced to change sintering actions, improve densification, or improve resistance to details slags and fluxes.
1.2 Microstructure, Porosity, and Mechanical Stability
The performance of alumina lining bricks is critically dependent on their microstructure, particularly grain dimension circulation, pore morphology, and bonding stage characteristics.
Ideal bricks show great, consistently distributed pores (closed porosity liked) and very little open porosity (
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