Alumina Ceramic Catalysts: Structurally Engineered Supports for Heterogeneous Catalysis and Chemical Transformation alumina silica refractory
1. Product Structure and Structural Characteristic
1.1 Alumina Content and Crystal Stage Evolution
( Alumina Lining Bricks)
Alumina lining blocks are thick, engineered refractory ceramics primarily composed of light weight aluminum oxide (Al two O ₃), with material usually ranging from 50% to over 99%, straight affecting their efficiency in high-temperature applications.
The mechanical stamina, rust resistance, and refractoriness of these bricks enhance with greater alumina focus as a result of the growth of a robust microstructure controlled by the thermodynamically steady α-alumina (diamond) stage.
Throughout production, precursor products such as calcined bauxite, integrated alumina, or synthetic alumina hydrate undergo high-temperature firing (1400 ° C– 1700 ° C), promoting phase improvement from transitional alumina types (γ, δ) to α-Al Two O THREE, which displays phenomenal firmness (9 on the Mohs range) and melting point (2054 ° C).
The resulting polycrystalline framework contains interlacing diamond grains installed in a siliceous or aluminosilicate lustrous matrix, the structure and volume of which are thoroughly regulated to balance thermal shock resistance and chemical resilience.
Minor additives such as silica (SiO TWO), titania (TiO ₂), or zirconia (ZrO TWO) may be presented to modify sintering behavior, enhance densification, or enhance resistance to particular slags and changes.
1.2 Microstructure, Porosity, and Mechanical Honesty
The efficiency of alumina lining blocks is critically dependent on their microstructure, especially grain dimension circulation, pore morphology, and bonding stage qualities.
Optimum blocks show fine, evenly distributed pores (shut porosity favored) and marginal open porosity (
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