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Aluminum Oxide

Aluminum Oxide

AlO is a naturally occurring common compound. It is useful in a variety of industries, most importantly in the manufacture of aluminium. The substance is used in the manufacture of industrial ceramics. Corundum, its most common crystal form, also has several variants of gem-quality.

Chemical Characteristics

  • Aluminum oxide comes in a variety of forms, like non-crystalline and crystalline varieties.
  • It's also got a high thermal conductivity.
  • Aluminum oxide's inflated melting point makes it an excellent refractory material for lining for appliances that work at high-temperature such as furnaces, kilns, crucibles, incinerators, and reactors of different types.
  • Aluminum oxide has the chemical formula Al2O3.
  • It's an electrical insulator, which means it does not conduct electricity.
  • Corundum's hardness makes it an effective abrasive in its crystal form.

Utilization in Aluminum Production

  • Aluminum oxide is most usually used in the production of aluminium metal.
  • The anodizing process can change the thickness and other properties of the oxide layer.
  • This prevents the aluminium from weakening and corrosion.
  • Metallic aluminium is highly reactive with oxygen, which could lead to corrosion.
  • Aluminum oxide is also a derivative of aluminium smelting.
  • When aluminium reacts with oxygen to form aluminium oxide, a thin layer forms that prevents it from oxidation.

Gemstones of Corundum

  • Corundum is the most usual crystal form of aluminium oxide.
  • Sapphires and rubies are both gem-quality varieties of corundum.
  • They get their distinct colour from minor impurities.
  • The traces of chromium in rubies give them deep red colour and laser qualities.
  • Sapphires come in diverse colours due to impurities such as titanium and iron.
  • Because of the hardness and stiffness of corundum, they can be used as abrasives and as integrants in sharp cutting tools.

Ceramic Applications

  • Aluminum oxide (AlO), also known as alumina, is highly used in engineering as ceramics.
  • High-temperature voltage and electrical insulators, instrumentation parts for thermal test machines, gas laser tubes, seal rings, and other equipment of laboratory are examples of these.
  • It is wear-resistant and hard, resistant to alkali and acid attacks, has high strength, is stiff and has good thermal conductivity, making it useful in the manufacture of a broad range of ceramic products.
  • AlO is also used to create ballistic armour.

Other Applications

  • It is used as an abrasive in sandpaper.
  • It is also used as a less expensive option for industrial diamonds due to its strength and hardness.
  • The most important is in the production of metallic aluminium.
  • It's also a common component of sunscreen.
  • Aluminum oxide is used as a filler in plastics because it is white, chemically inert, and non-toxic.
  • Aluminum oxide is found in some DVD and CD polishing kits.
  • Aluminum oxide is used as a polishing agent by dentists to remove teeth stains.
  • It has the same properties that make it a good ingredient in toothpaste.


  • Boiling point: 2,977 °C
  • Density: 3.95–4.1 g/cm3
  • Molar mass: 101.96 g·mol−1
  • Melting point: 2,072 °C
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