1. Product Make-up and Structural Properties
1.1 Alumina Web Content and Crystal Stage Advancement
( Alumina Lining Bricks)
Alumina lining blocks are dense, crafted refractory porcelains mainly composed of light weight aluminum oxide (Al â‚‚ O SIX), with material typically varying from 50% to over 99%, directly influencing their performance in high-temperature applications.
The mechanical strength, rust resistance, and refractoriness of these blocks increase with greater alumina focus due to the advancement of a robust microstructure dominated by the thermodynamically secure α-alumina (corundum) phase.
Throughout manufacturing, precursor materials such as calcined bauxite, fused alumina, or artificial alumina hydrate undertake high-temperature firing (1400 ° C– 1700 ° C), advertising stage change from transitional alumina kinds (Îł, δ) to α-Al â‚‚ O THREE, which exhibits remarkable solidity (9 on the Mohs range) and melting factor (2054 ° C).
The resulting polycrystalline structure contains interlocking diamond grains installed in a siliceous or aluminosilicate glassy matrix, the composition and quantity of which are carefully managed to stabilize thermal shock resistance and chemical toughness.
Small ingredients such as silica (SiO â‚‚), titania (TiO TWO), or zirconia (ZrO â‚‚) might be presented to customize sintering habits, enhance densification, or enhance resistance to specific slags and changes.
1.2 Microstructure, Porosity, and Mechanical Integrity
The performance of alumina lining bricks is seriously depending on their microstructure, particularly grain size circulation, pore morphology, and bonding phase attributes.
Optimum blocks show great, uniformly dispersed pores (closed porosity chosen) and very little open porosity (
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