1. Product Composition and Structural Characteristic
1.1 Alumina Web Content and Crystal Phase Advancement
( Alumina Lining Bricks)
Alumina lining blocks are thick, crafted refractory ceramics mostly composed of aluminum oxide (Al two O THREE), with content typically varying from 50% to over 99%, directly influencing their performance in high-temperature applications.
The mechanical strength, deterioration resistance, and refractoriness of these bricks raise with higher alumina concentration due to the advancement of a robust microstructure dominated by the thermodynamically secure α-alumina (diamond) stage.
During manufacturing, precursor products such as calcined bauxite, fused alumina, or artificial alumina hydrate go through high-temperature firing (1400 ° C– 1700 ° C), promoting stage makeover from transitional alumina kinds (γ, δ) to α-Al Two O ₃, which shows remarkable hardness (9 on the Mohs scale) and melting point (2054 ° C).
The resulting polycrystalline structure includes interlacing corundum grains installed in a siliceous or aluminosilicate glazed matrix, the composition and quantity of which are carefully controlled to balance thermal shock resistance and chemical toughness.
Small additives such as silica (SiO â‚‚), titania (TiO â‚‚), or zirconia (ZrO TWO) may be presented to modify sintering habits, boost 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, particularly grain dimension circulation, pore morphology, and bonding phase qualities.
Optimum blocks exhibit fine, uniformly dispersed pores (shut porosity favored) and very little open porosity (
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