1. Product Structure and Structural Feature
1.1 Alumina Material and Crystal Stage Development
( Alumina Lining Bricks)
Alumina lining blocks are dense, engineered refractory ceramics largely made up of aluminum oxide (Al two O FIVE), with content usually varying from 50% to over 99%, straight influencing their efficiency in high-temperature applications.
The mechanical stamina, rust resistance, and refractoriness of these blocks raise with greater alumina concentration due to the growth of a robust microstructure controlled by the thermodynamically secure α-alumina (corundum) stage.
Throughout production, precursor products such as calcined bauxite, merged alumina, or artificial alumina hydrate go through high-temperature firing (1400 ° C– 1700 ° C), promoting stage improvement from transitional alumina forms (γ, δ) to α-Al Two O FOUR, which displays extraordinary solidity (9 on the Mohs scale) and melting factor (2054 ° C).
The resulting polycrystalline structure contains interlacing diamond grains embedded in a siliceous or aluminosilicate glazed matrix, the composition and quantity of which are thoroughly managed to balance thermal shock resistance and chemical longevity.
Minor ingredients such as silica (SiO ₂), titania (TiO ₂), or zirconia (ZrO TWO) may be introduced to change sintering habits, improve densification, or improve resistance to details slags and changes.
1.2 Microstructure, Porosity, and Mechanical Integrity
The efficiency of alumina lining bricks is critically based on their microstructure, especially grain size distribution, pore morphology, and bonding phase qualities.
Optimal bricks show great, consistently dispersed pores (closed porosity preferred) and very little open porosity (
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