Alumina Ceramic Catalysts: Structurally Engineered Supports for Heterogeneous Catalysis and Chemical Transformation alumina silica refractory
1. Material Structure and Structural Residence
1.1 Alumina Content and Crystal Stage Evolution
( Alumina Lining Bricks)
Alumina lining bricks are dense, crafted refractory ceramics mostly made up of aluminum oxide (Al ₂ O TWO), with material normally ranging from 50% to over 99%, directly affecting their efficiency in high-temperature applications.
The mechanical strength, deterioration resistance, and refractoriness of these bricks increase with higher alumina focus because of the advancement of a robust microstructure dominated by the thermodynamically steady α-alumina (diamond) phase.
Throughout production, precursor materials such as calcined bauxite, fused alumina, or artificial alumina hydrate undergo high-temperature firing (1400 ° C– 1700 ° C), promoting phase makeover from transitional alumina kinds (γ, δ) to α-Al ₂ O THREE, which displays phenomenal hardness (9 on the Mohs range) and melting factor (2054 ° C).
The resulting polycrystalline framework consists of interlacing diamond grains installed in a siliceous or aluminosilicate glassy matrix, the make-up and volume of which are thoroughly regulated to stabilize thermal shock resistance and chemical sturdiness.
Minor additives such as silica (SiO ₂), titania (TiO TWO), or zirconia (ZrO ₂) might be presented to modify sintering habits, enhance densification, or improve resistance to certain slags and fluxes.
1.2 Microstructure, Porosity, and Mechanical Honesty
The performance of alumina lining bricks is critically based on their microstructure, specifically grain size circulation, pore morphology, and bonding stage characteristics.
Ideal blocks exhibit fine, evenly dispersed pores (closed porosity preferred) and marginal open porosity (
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