1. Product Composition and Structural Quality
1.1 Alumina Web Content and Crystal Phase Evolution
( Alumina Lining Bricks)
Alumina lining blocks are thick, engineered refractory porcelains mostly composed of aluminum oxide (Al two O ₃), with material generally varying from 50% to over 99%, directly influencing their efficiency in high-temperature applications.
The mechanical toughness, rust resistance, and refractoriness of these blocks boost with greater alumina focus due to the growth of a robust microstructure controlled by the thermodynamically steady α-alumina (corundum) phase.
During manufacturing, precursor products such as calcined bauxite, integrated alumina, or artificial alumina hydrate undergo high-temperature firing (1400 ° C– 1700 ° C), promoting phase change from transitional alumina forms (γ, δ) to α-Al Two O TWO, which shows remarkable solidity (9 on the Mohs scale) and melting point (2054 ° C).
The resulting polycrystalline structure includes interlacing diamond grains installed in a siliceous or aluminosilicate glassy matrix, the make-up and quantity of which are thoroughly managed to balance thermal shock resistance and chemical sturdiness.
Minor additives such as silica (SiO â‚‚), titania (TiO TWO), or zirconia (ZrO TWO) may be presented to customize sintering behavior, improve densification, or enhance resistance to details 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 stage characteristics.
Optimum bricks exhibit great, evenly distributed pores (shut porosity liked) and very little open porosity (
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