1. Product Make-up and Structural Residence
1.1 Alumina Web Content and Crystal Stage Development
( Alumina Lining Bricks)
Alumina lining blocks are dense, crafted refractory ceramics primarily made up of aluminum oxide (Al two O TWO), with material usually varying from 50% to over 99%, directly influencing their performance in high-temperature applications.
The mechanical stamina, deterioration resistance, and refractoriness of these blocks raise with higher alumina focus due to the advancement of a robust microstructure dominated by the thermodynamically stable α-alumina (diamond) phase.
Throughout production, forerunner products such as calcined bauxite, merged alumina, or artificial alumina hydrate undertake high-temperature firing (1400 ° C– 1700 ° C), advertising phase change from transitional alumina types (γ, δ) to α-Al â‚‚ O SIX, which shows outstanding hardness (9 on the Mohs scale) and melting factor (2054 ° C).
The resulting polycrystalline structure consists of interlacing corundum grains embedded in a siliceous or aluminosilicate glazed matrix, the make-up and quantity of which are meticulously regulated to balance thermal shock resistance and chemical durability.
Small ingredients such as silica (SiO â‚‚), titania (TiO TWO), or zirconia (ZrO TWO) might be introduced to customize sintering actions, boost densification, or enhance resistance to certain slags and fluxes.
1.2 Microstructure, Porosity, and Mechanical Integrity
The performance of alumina lining blocks is critically depending on their microstructure, particularly grain size distribution, pore morphology, and bonding phase characteristics.
Optimal bricks display fine, evenly distributed pores (closed porosity favored) and very little open porosity (
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