1. Product Structure and Structural Characteristic
1.1 Alumina Content and Crystal Stage Development
( Alumina Lining Bricks)
Alumina lining blocks are thick, engineered refractory porcelains mainly made up of light weight aluminum oxide (Al â‚‚ O FOUR), with web content usually varying from 50% to over 99%, directly affecting their efficiency in high-temperature applications.
The mechanical toughness, rust resistance, and refractoriness of these bricks boost with higher alumina focus because of the development of a robust microstructure controlled by the thermodynamically stable α-alumina (diamond) stage.
Throughout manufacturing, precursor products such as calcined bauxite, integrated alumina, or synthetic alumina hydrate go through high-temperature shooting (1400 ° C– 1700 ° C), advertising phase improvement from transitional alumina types (γ, δ) to α-Al â‚‚ O TWO, which exhibits extraordinary firmness (9 on the Mohs scale) and melting point (2054 ° C).
The resulting polycrystalline structure includes interlacing corundum grains installed in a siliceous or aluminosilicate lustrous matrix, the composition and quantity of which are thoroughly regulated to balance thermal shock resistance and chemical toughness.
Small additives such as silica (SiO â‚‚), titania (TiO TWO), or zirconia (ZrO â‚‚) may be introduced to customize sintering actions, boost densification, or boost resistance to particular slags and changes.
1.2 Microstructure, Porosity, and Mechanical Integrity
The performance of alumina lining blocks is critically depending on their microstructure, specifically grain dimension circulation, pore morphology, and bonding stage characteristics.
Ideal blocks exhibit great, evenly dispersed pores (shut porosity chosen) and minimal open porosity (
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