1. Material Composition and Structural Quality
1.1 Alumina Content and Crystal Stage Advancement
( Alumina Lining Bricks)
Alumina lining blocks are thick, engineered refractory ceramics mostly made up of light weight aluminum oxide (Al two O FOUR), with web content generally varying from 50% to over 99%, directly affecting their performance in high-temperature applications.
The mechanical stamina, deterioration resistance, and refractoriness of these blocks enhance with greater alumina focus due to the development of a robust microstructure controlled by the thermodynamically stable α-alumina (diamond) stage.
During manufacturing, forerunner materials such as calcined bauxite, merged alumina, or artificial alumina hydrate undergo high-temperature firing (1400 ° C– 1700 ° C), promoting stage change from transitional alumina kinds (γ, δ) to α-Al â‚‚ O ₃, which shows extraordinary hardness (9 on the Mohs range) and melting factor (2054 ° C).
The resulting polycrystalline structure consists of interlacing diamond grains installed in a siliceous or aluminosilicate lustrous matrix, the composition and volume of which are thoroughly regulated to balance thermal shock resistance and chemical sturdiness.
Minor ingredients such as silica (SiO â‚‚), titania (TiO TWO), or zirconia (ZrO TWO) may be introduced to change sintering behavior, enhance densification, or improve resistance to details slags and fluxes.
1.2 Microstructure, Porosity, and Mechanical Stability
The performance of alumina lining bricks is critically depending on their microstructure, specifically grain size circulation, pore morphology, and bonding phase characteristics.
Optimum blocks exhibit fine, consistently distributed pores (shut porosity favored) and very little open porosity (
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