1. Material Composition and Structural Feature
1.1 Alumina Web Content and Crystal Stage Advancement
( Alumina Lining Bricks)
Alumina lining blocks are dense, engineered refractory ceramics largely composed of aluminum oxide (Al two O SIX), with content generally varying from 50% to over 99%, directly influencing their performance in high-temperature applications.
The mechanical toughness, corrosion resistance, and refractoriness of these bricks boost with higher alumina focus because of the growth of a durable microstructure dominated by the thermodynamically steady α-alumina (corundum) phase.
During production, forerunner products such as calcined bauxite, fused alumina, or synthetic alumina hydrate go through high-temperature firing (1400 ° C– 1700 ° C), promoting stage makeover from transitional alumina forms (γ, δ) to α-Al Two O FIVE, which displays phenomenal firmness (9 on the Mohs range) and melting factor (2054 ° C).
The resulting polycrystalline structure contains interlocking corundum grains installed in a siliceous or aluminosilicate glassy matrix, the make-up and quantity of which are meticulously regulated to balance thermal shock resistance and chemical resilience.
Minor ingredients such as silica (SiO TWO), titania (TiO â‚‚), or zirconia (ZrO â‚‚) may be presented to customize sintering behavior, improve densification, or improve resistance to certain slags and fluxes.
1.2 Microstructure, Porosity, and Mechanical Integrity
The efficiency of alumina lining blocks is critically based on their microstructure, particularly grain dimension circulation, pore morphology, and bonding phase qualities.
Optimal bricks show great, consistently distributed pores (closed porosity liked) and marginal open porosity (
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