1. Product Composition and Structural Feature
1.1 Alumina Content and Crystal Phase Development
( Alumina Lining Bricks)
Alumina lining blocks are thick, engineered refractory porcelains primarily made up of aluminum oxide (Al â‚‚ O TWO), with web content usually ranging from 50% to over 99%, straight affecting their efficiency in high-temperature applications.
The mechanical stamina, corrosion resistance, and refractoriness of these blocks boost with higher alumina focus as a result of the advancement of a durable microstructure controlled by the thermodynamically steady α-alumina (corundum) phase.
Throughout manufacturing, precursor products such as calcined bauxite, fused alumina, or synthetic alumina hydrate undergo high-temperature firing (1400 ° C– 1700 ° C), advertising stage change from transitional alumina types (Îł, δ) to α-Al â‚‚ O FOUR, which displays extraordinary hardness (9 on the Mohs range) and melting factor (2054 ° C).
The resulting polycrystalline structure consists of interlacing corundum grains embedded in a siliceous or aluminosilicate glassy matrix, the make-up and volume of which are thoroughly managed to balance thermal shock resistance and chemical resilience.
Minor ingredients such as silica (SiO â‚‚), titania (TiO TWO), or zirconia (ZrO TWO) may be presented to change sintering behavior, improve densification, or boost resistance to particular slags and changes.
1.2 Microstructure, Porosity, and Mechanical Stability
The efficiency of alumina lining bricks is critically dependent on their microstructure, especially grain size distribution, pore morphology, and bonding phase features.
Optimal blocks exhibit fine, consistently distributed pores (shut porosity liked) and marginal open porosity (
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