1. Product Structure and Structural Characteristic
1.1 Alumina Web Content and Crystal Stage Advancement
( Alumina Lining Bricks)
Alumina lining bricks are dense, crafted refractory porcelains mainly composed of aluminum oxide (Al two O TWO), with web content typically varying from 50% to over 99%, directly influencing their efficiency in high-temperature applications.
The mechanical stamina, corrosion resistance, and refractoriness of these bricks raise with higher alumina focus due to the growth of a robust microstructure dominated by the thermodynamically stable α-alumina (diamond) phase.
Throughout manufacturing, forerunner products such as calcined bauxite, integrated alumina, or synthetic alumina hydrate undertake high-temperature firing (1400 ° C– 1700 ° C), promoting phase makeover from transitional alumina kinds (Îł, δ) to α-Al Two O FOUR, which displays extraordinary solidity (9 on the Mohs range) and melting factor (2054 ° C).
The resulting polycrystalline framework contains interlocking diamond grains embedded in a siliceous or aluminosilicate glassy matrix, the composition and volume of which are very carefully managed to balance thermal shock resistance and chemical resilience.
Minor additives such as silica (SiO â‚‚), titania (TiO TWO), or zirconia (ZrO â‚‚) may be presented to modify sintering actions, boost densification, or improve resistance to specific slags and changes.
1.2 Microstructure, Porosity, and Mechanical Stability
The efficiency of alumina lining blocks is critically dependent on their microstructure, specifically grain size circulation, pore morphology, and bonding phase qualities.
Ideal blocks display fine, evenly distributed pores (closed porosity favored) and minimal open porosity (
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