1. Product Structure and Structural Residence
1.1 Alumina Content and Crystal Stage Advancement
( Alumina Lining Bricks)
Alumina lining blocks are dense, engineered refractory ceramics largely made up of light weight aluminum oxide (Al â‚‚ O FOUR), with material commonly ranging from 50% to over 99%, straight influencing their efficiency in high-temperature applications.
The mechanical toughness, deterioration resistance, and refractoriness of these bricks enhance with greater alumina focus due to the growth of a durable microstructure dominated by the thermodynamically steady α-alumina (corundum) phase.
During manufacturing, precursor products such as calcined bauxite, fused alumina, or synthetic alumina hydrate go through high-temperature shooting (1400 ° C– 1700 ° C), promoting stage transformation from transitional alumina forms (γ, δ) to α-Al â‚‚ O ₃, which shows extraordinary hardness (9 on the Mohs range) and melting point (2054 ° C).
The resulting polycrystalline framework contains interlacing corundum grains embedded in a siliceous or aluminosilicate glassy matrix, the structure and volume of which are carefully controlled to stabilize thermal shock resistance and chemical resilience.
Small additives such as silica (SiO â‚‚), titania (TiO â‚‚), or zirconia (ZrO â‚‚) might be presented to customize sintering actions, boost densification, or improve resistance to details slags and fluxes.
1.2 Microstructure, Porosity, and Mechanical Integrity
The efficiency of alumina lining blocks is critically based on their microstructure, specifically grain dimension distribution, pore morphology, and bonding phase attributes.
Optimal blocks display great, evenly dispersed pores (closed porosity favored) and marginal open porosity (
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