1. Product Make-up and Structural Quality
1.1 Alumina Material and Crystal Phase Evolution
( Alumina Lining Bricks)
Alumina lining bricks are thick, engineered refractory porcelains largely composed of aluminum oxide (Al two O THREE), with material generally ranging from 50% to over 99%, straight influencing their efficiency in high-temperature applications.
The mechanical stamina, rust resistance, and refractoriness of these bricks enhance with higher alumina focus due to the development of a robust microstructure dominated by the thermodynamically stable α-alumina (corundum) stage.
Throughout manufacturing, precursor products such as calcined bauxite, merged alumina, or artificial alumina hydrate undertake high-temperature firing (1400 ° C– 1700 ° C), promoting phase transformation from transitional alumina forms (Îł, δ) to α-Al Two O TWO, which shows outstanding hardness (9 on the Mohs scale) and melting point (2054 ° C).
The resulting polycrystalline framework contains interlocking corundum 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.
Small additives such as silica (SiO â‚‚), titania (TiO TWO), or zirconia (ZrO TWO) might be presented to customize sintering habits, boost densification, or boost resistance to certain slags and fluxes.
1.2 Microstructure, Porosity, and Mechanical Integrity
The efficiency of alumina lining bricks is seriously depending on their microstructure, specifically grain dimension circulation, pore morphology, and bonding phase qualities.
Ideal bricks display great, consistently distributed pores (shut porosity favored) and minimal open porosity (
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