1. Product Structure and Structural Residence
1.1 Alumina Material and Crystal Stage Advancement
( Alumina Lining Bricks)
Alumina lining blocks are thick, crafted refractory porcelains mostly composed of light weight aluminum oxide (Al â‚‚ O TWO), with material normally varying from 50% to over 99%, directly affecting their efficiency in high-temperature applications.
The mechanical stamina, rust resistance, and refractoriness of these bricks raise with greater alumina concentration as a result of the development of a robust microstructure controlled by the thermodynamically steady α-alumina (diamond) phase.
Throughout production, precursor materials such as calcined bauxite, merged alumina, or synthetic alumina hydrate go through high-temperature shooting (1400 ° C– 1700 ° C), advertising stage transformation from transitional alumina forms (γ, δ) to α-Al â‚‚ O ₃, which shows phenomenal hardness (9 on the Mohs scale) and melting factor (2054 ° C).
The resulting polycrystalline framework includes interlacing corundum grains embedded in a siliceous or aluminosilicate glassy matrix, the structure and quantity of which are very carefully regulated to balance thermal shock resistance and chemical longevity.
Small additives such as silica (SiO â‚‚), titania (TiO â‚‚), or zirconia (ZrO â‚‚) might be introduced to customize sintering behavior, enhance densification, or improve resistance to particular slags and changes.
1.2 Microstructure, Porosity, and Mechanical Honesty
The performance of alumina lining bricks is critically depending on their microstructure, particularly grain size distribution, pore morphology, and bonding stage characteristics.
Ideal bricks exhibit great, uniformly distributed pores (closed porosity liked) and very little open porosity (
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