1. Product Make-up and Structural Quality
1.1 Alumina Content and Crystal Phase Advancement
( Alumina Lining Bricks)
Alumina lining bricks are dense, crafted refractory ceramics largely composed of light weight aluminum oxide (Al ₂ O ₃), with material commonly ranging from 50% to over 99%, directly influencing their efficiency in high-temperature applications.
The mechanical stamina, deterioration resistance, and refractoriness of these blocks enhance with greater alumina concentration because of the advancement of a robust microstructure controlled by the thermodynamically stable α-alumina (diamond) stage.
Throughout production, precursor materials such as calcined bauxite, merged alumina, or artificial alumina hydrate undergo high-temperature shooting (1400 ° C– 1700 ° C), promoting stage improvement from transitional alumina kinds (γ, δ) to α-Al Two O SIX, which exhibits outstanding hardness (9 on the Mohs range) and melting factor (2054 ° C).
The resulting polycrystalline structure consists of interlocking diamond grains installed in a siliceous or aluminosilicate lustrous matrix, the structure and quantity of which are thoroughly controlled to stabilize thermal shock resistance and chemical sturdiness.
Minor ingredients such as silica (SiO â‚‚), titania (TiO TWO), or zirconia (ZrO TWO) may be introduced to change sintering habits, boost densification, or boost resistance to certain slags and fluxes.
1.2 Microstructure, Porosity, and Mechanical Stability
The efficiency of alumina lining blocks is critically based on their microstructure, particularly grain size distribution, pore morphology, and bonding stage attributes.
Optimal bricks exhibit great, consistently distributed pores (shut porosity liked) and marginal open porosity (
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