1. Product Composition and Structural Feature
1.1 Alumina Material and Crystal Stage Development
( Alumina Lining Bricks)
Alumina lining blocks are thick, crafted refractory ceramics primarily composed of light weight aluminum oxide (Al two O THREE), with material commonly varying from 50% to over 99%, straight influencing their performance in high-temperature applications.
The mechanical strength, rust resistance, and refractoriness of these blocks boost with greater alumina focus due to the advancement of a robust microstructure controlled by the thermodynamically steady α-alumina (diamond) phase.
During manufacturing, forerunner products such as calcined bauxite, integrated alumina, or artificial alumina hydrate undergo high-temperature firing (1400 ° C– 1700 ° C), advertising stage change from transitional alumina forms (γ, δ) to α-Al â‚‚ O FIVE, which exhibits phenomenal hardness (9 on the Mohs scale) and melting factor (2054 ° C).
The resulting polycrystalline framework consists of interlocking corundum grains embedded in a siliceous or aluminosilicate glassy matrix, the composition and quantity of which are meticulously regulated to balance thermal shock resistance and chemical durability.
Minor additives such as silica (SiO TWO), titania (TiO â‚‚), or zirconia (ZrO TWO) might be introduced to customize sintering behavior, improve densification, or enhance resistance to details slags and changes.
1.2 Microstructure, Porosity, and Mechanical Honesty
The efficiency of alumina lining bricks is seriously depending on their microstructure, specifically grain size distribution, pore morphology, and bonding phase qualities.
Ideal blocks display great, uniformly distributed pores (closed porosity favored) and marginal open porosity (
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