1. Product Composition and Structural Residence
1.1 Alumina Content and Crystal Stage Advancement
( Alumina Lining Bricks)
Alumina lining blocks are thick, engineered refractory ceramics largely made up of light weight aluminum oxide (Al two O THREE), with content normally ranging 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 greater alumina focus due to the advancement of a robust microstructure dominated by the thermodynamically stable α-alumina (corundum) stage.
Throughout manufacturing, forerunner materials such as calcined bauxite, fused alumina, or synthetic alumina hydrate go through high-temperature firing (1400 ° C– 1700 ° C), promoting phase improvement from transitional alumina kinds (γ, δ) to α-Al ₂ O FIVE, which displays remarkable firmness (9 on the Mohs scale) and melting factor (2054 ° C).
The resulting polycrystalline structure contains interlacing corundum grains installed in a siliceous or aluminosilicate glassy matrix, the make-up and volume of which are very carefully controlled to balance thermal shock resistance and chemical sturdiness.
Minor ingredients such as silica (SiO ₂), titania (TiO ₂), or zirconia (ZrO ₂) might be presented to modify sintering behavior, improve densification, or enhance resistance to certain slags and changes.
1.2 Microstructure, Porosity, and Mechanical Honesty
The performance of alumina lining blocks is critically depending on their microstructure, particularly grain size circulation, pore morphology, and bonding stage attributes.
Ideal bricks show great, uniformly distributed pores (closed porosity chosen) and marginal open porosity (
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