1. Material Composition and Structural Properties
1.1 Alumina Content and Crystal Phase Advancement
( Alumina Lining Bricks)
Alumina lining blocks are thick, crafted refractory porcelains mostly made up of aluminum oxide (Al two O FOUR), with content usually ranging from 50% to over 99%, directly affecting their efficiency in high-temperature applications.
The mechanical stamina, rust resistance, and refractoriness of these blocks raise with higher alumina focus because of the development of a durable microstructure dominated by the thermodynamically stable α-alumina (corundum) stage.
During production, forerunner products such as calcined bauxite, merged alumina, or artificial alumina hydrate undergo high-temperature firing (1400 ° C– 1700 ° C), advertising stage makeover from transitional alumina forms (γ, δ) to α-Al ₂ O TWO, which exhibits extraordinary firmness (9 on the Mohs range) and melting point (2054 ° C).
The resulting polycrystalline framework consists of interlacing corundum grains installed in a siliceous or aluminosilicate glassy matrix, the structure and volume of which are thoroughly controlled to balance thermal shock resistance and chemical sturdiness.
Minor additives such as silica (SiO TWO), titania (TiO TWO), or zirconia (ZrO TWO) may be presented to customize sintering actions, boost densification, or boost resistance to certain slags and changes.
1.2 Microstructure, Porosity, and Mechanical Integrity
The efficiency of alumina lining bricks is seriously depending on their microstructure, particularly grain size circulation, pore morphology, and bonding stage characteristics.
Ideal blocks display great, uniformly dispersed pores (closed porosity chosen) and minimal open porosity (
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