1. Product Make-up and Structural Characteristic
1.1 Alumina Material and Crystal Stage Evolution
( Alumina Lining Bricks)
Alumina lining bricks are dense, engineered refractory ceramics mostly composed of light weight aluminum oxide (Al two O TWO), with web content typically ranging from 50% to over 99%, straight influencing their efficiency in high-temperature applications.
The mechanical toughness, deterioration resistance, and refractoriness of these blocks increase with higher alumina focus as a result of the advancement of a durable microstructure dominated by the thermodynamically secure α-alumina (corundum) phase.
During production, precursor products such as calcined bauxite, fused alumina, or synthetic alumina hydrate undertake high-temperature firing (1400 ° C– 1700 ° C), advertising phase change from transitional alumina kinds (γ, δ) to α-Al Two O ₃, which exhibits remarkable hardness (9 on the Mohs scale) and melting point (2054 ° C).
The resulting polycrystalline framework consists of interlocking corundum grains embedded in a siliceous or aluminosilicate glazed matrix, the make-up and volume of which are carefully controlled to stabilize thermal shock resistance and chemical resilience.
Small ingredients such as silica (SiO â‚‚), titania (TiO TWO), or zirconia (ZrO â‚‚) may be presented to customize sintering behavior, enhance densification, or boost resistance to certain slags and changes.
1.2 Microstructure, Porosity, and Mechanical Honesty
The efficiency of alumina lining blocks is seriously depending on their microstructure, especially grain dimension distribution, pore morphology, and bonding stage attributes.
Optimal bricks exhibit fine, consistently distributed pores (shut porosity liked) and marginal open porosity (
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