1. Material Structure and Structural Properties
1.1 Alumina Web Content and Crystal Stage Evolution
( Alumina Lining Bricks)
Alumina lining bricks are dense, crafted refractory ceramics mostly composed of aluminum oxide (Al ₂ O ₃), with web content typically ranging from 50% to over 99%, directly influencing their efficiency in high-temperature applications.
The mechanical toughness, deterioration resistance, and refractoriness of these blocks enhance with higher alumina concentration as a result of the advancement of a robust microstructure controlled by the thermodynamically secure α-alumina (corundum) phase.
During manufacturing, forerunner products such as calcined bauxite, integrated alumina, or synthetic alumina hydrate undergo high-temperature firing (1400 ° C– 1700 ° C), advertising stage change from transitional alumina types (γ, δ) to α-Al Two O THREE, which shows remarkable hardness (9 on the Mohs scale) and melting point (2054 ° C).
The resulting polycrystalline structure includes interlacing diamond grains embedded in a siliceous or aluminosilicate lustrous matrix, the composition and quantity of which are very carefully managed to stabilize thermal shock resistance and chemical resilience.
Small additives such as silica (SiO â‚‚), titania (TiO â‚‚), or zirconia (ZrO â‚‚) may be presented to change sintering actions, boost densification, or enhance resistance to details slags and changes.
1.2 Microstructure, Porosity, and Mechanical Integrity
The performance of alumina lining blocks is seriously based on their microstructure, especially grain size distribution, pore morphology, and bonding phase qualities.
Optimum bricks exhibit fine, uniformly dispersed pores (closed porosity preferred) and very little open porosity (
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