1. Material Make-up and Structural Feature
1.1 Alumina Web Content and Crystal Phase Development
( Alumina Lining Bricks)
Alumina lining bricks are thick, crafted refractory porcelains primarily composed of aluminum oxide (Al two O ₃), with web content typically varying from 50% to over 99%, directly influencing their performance in high-temperature applications.
The mechanical toughness, rust resistance, and refractoriness of these bricks enhance with greater alumina concentration due to the development of a durable microstructure controlled by the thermodynamically steady α-alumina (diamond) phase.
During manufacturing, precursor products such as calcined bauxite, integrated alumina, or artificial alumina hydrate undertake high-temperature firing (1400 ° C– 1700 ° C), advertising stage improvement from transitional alumina types (γ, δ) to α-Al Two O FIVE, which exhibits exceptional firmness (9 on the Mohs range) and melting point (2054 ° C).
The resulting polycrystalline framework includes interlocking diamond grains embedded in a siliceous or aluminosilicate glassy matrix, the structure and volume of which are carefully controlled to balance thermal shock resistance and chemical toughness.
Small additives such as silica (SiO TWO), titania (TiO â‚‚), or zirconia (ZrO TWO) may be presented to change sintering behavior, enhance densification, or improve resistance to certain slags and fluxes.
1.2 Microstructure, Porosity, and Mechanical Honesty
The performance of alumina lining blocks is seriously based on their microstructure, specifically grain size distribution, pore morphology, and bonding stage features.
Optimal bricks exhibit great, evenly dispersed pores (shut porosity chosen) and minimal open porosity (
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