1. Product Composition and Structural Residence
1.1 Alumina Content and Crystal Stage Evolution
( Alumina Lining Bricks)
Alumina lining bricks are dense, engineered refractory porcelains mostly composed of light weight aluminum oxide (Al two O SIX), with material usually ranging from 50% to over 99%, directly affecting their performance in high-temperature applications.
The mechanical toughness, deterioration resistance, and refractoriness of these bricks enhance with greater alumina concentration as a result of the growth of a durable microstructure controlled by the thermodynamically secure α-alumina (diamond) stage.
Throughout manufacturing, forerunner products such as calcined bauxite, merged alumina, or synthetic alumina hydrate undertake high-temperature shooting (1400 ° C– 1700 ° C), promoting phase transformation from transitional alumina forms (γ, δ) to α-Al ₂ O FOUR, which displays extraordinary hardness (9 on the Mohs scale) and melting point (2054 ° C).
The resulting polycrystalline framework contains interlocking diamond grains installed in a siliceous or aluminosilicate glazed matrix, the structure and quantity of which are thoroughly managed to balance thermal shock resistance and chemical resilience.
Small ingredients such as silica (SiO ₂), titania (TiO ₂), or zirconia (ZrO TWO) might be introduced to change sintering actions, enhance densification, or improve resistance to specific slags and fluxes.
1.2 Microstructure, Porosity, and Mechanical Integrity
The efficiency of alumina lining blocks is critically based on their microstructure, particularly grain size circulation, pore morphology, and bonding phase characteristics.
Optimal blocks display great, uniformly distributed pores (shut porosity preferred) and minimal open porosity (
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