Knowra Aluminium oxide Aluminium oxide Aluminium oxide (Al₂O₃) is a compound of aluminium and oxygen. Its hardness, chemical stability, and high melting point make it useful in ceramics, abrasives, and aluminium production.
Aluminium : A lightweight metallic element with atomic number 13, widely used in alloys, packaging, and electrical conductors. Aluminium is the metal cation in Al₂O₃ and the product extracted from its ores.
Bayer process : An industrial process that extracts alumina from bauxite using hot sodium hydroxide solution. It supplies most aluminium oxide used in metal production.
Alumina ceramics : Ceramic materials made primarily from aluminium oxide, valued for hardness, wear resistance, and electrical insulation. They turn alumina's hardness and thermal stability into engineered components.
Aluminium hydroxide : A compound of aluminium, oxygen, and hydrogen with formula Al(OH)₃. Unlike hydroxide, aluminium oxide contains no hydrogen and is the calcined product.
Oxygen : A chemical element with atomic number 8 that forms oxides with most other elements. Oxygen combines with aluminium in the compound's fixed 3:2 atomic ratio.
Calcination : Heating a solid to cause thermal decomposition or drive off volatile components. Heating aluminium hydroxide in the Bayer process produces aluminium oxide.
Abrasive : A hard material used to wear, polish, grind, or cut another surface. Aluminium oxide grains abrade metals and other materials in common tools.
Aluminium nitride : A ceramic compound of aluminium and nitrogen with formula AlN, known for high thermal conductivity. It offers a contrasting ceramic combination of electrical insulation and heat transfer.
Ionic bonding : Chemical bonding based primarily on electrostatic attraction between oppositely charged ions. The ionic model helps explain Al₂O₃'s high melting point and electrical behavior.
Hall–Héroult process : An electrolytic process that produces aluminium metal from alumina dissolved in molten cryolite. It consumes purified aluminium oxide to make primary aluminium.
Show all 22