Alumina Ceramic Catalysts: Structurally Engineered Supports for Heterogeneous Catalysis and Chemical Transformation alumina castable
1. Product Composition and Structural Feature
1.1 Alumina Content and Crystal Stage Advancement
( Alumina Lining Bricks)
Alumina lining bricks are dense, crafted refractory porcelains largely made up of aluminum oxide (Al two O SIX), with web content normally varying from 50% to over 99%, directly influencing their performance in high-temperature applications.
The mechanical strength, rust resistance, and refractoriness of these bricks boost with greater alumina focus due to the development of a durable microstructure controlled by the thermodynamically stable α-alumina (diamond) stage.
During manufacturing, forerunner materials such as calcined bauxite, merged alumina, or artificial alumina hydrate go through high-temperature firing (1400 ° C– 1700 ° C), promoting stage change from transitional alumina types (γ, δ) to α-Al â‚‚ O FIVE, which displays remarkable firmness (9 on the Mohs scale) and melting point (2054 ° C).
The resulting polycrystalline structure consists of interlocking diamond grains installed in a siliceous or aluminosilicate glazed matrix, the make-up and quantity of which are carefully regulated to balance thermal shock resistance and chemical sturdiness.
Small additives such as silica (SiO â‚‚), titania (TiO TWO), or zirconia (ZrO â‚‚) might be presented to modify sintering behavior, enhance densification, or improve resistance to specific slags and changes.
1.2 Microstructure, Porosity, and Mechanical Integrity
The performance of alumina lining bricks is seriously based on their microstructure, specifically grain dimension circulation, pore morphology, and bonding stage characteristics.
Optimum blocks display fine, consistently dispersed pores (closed porosity preferred) and marginal open porosity (
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