Aluminum oxide is a common, naturally developing compound that’s work in miscellaneous industries, most specifically in the manufacturing of aluminum. The compound is supplied in production of industrial ceramics. The most common crystalline form, corundum, has actually several gem-quality variants, as well.

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Chemical Properties

There are numerous different develops of aluminum oxide, consisting of both crystalline and also non-crystalline forms. The chemical formula because that Aluminum Oxide is Al₂O₃. It’s an electric insulator, which way it doesn’t conduct electricity, and it additionally has reasonably high thermal conductivity. In addition, in that crystalline form, corundum, that hardness renders it an ideal as one abrasive. The high melting allude of aluminum oxide renders it a an excellent refractory material for lining high-temperature appliances like kilns, furnaces, incinerators, reactors of various sorts, and crucibles.


Use in manufacturing of Aluminum

The most common use the aluminum oxide is in the manufacturing of steel aluminum. Metallic aluminum is reactive with oxygen, which could reason corrosion to build up. However, as soon as aluminum bonds v oxygen to kind aluminum oxide, it create a thin coating that protects it from oxidation. This keeps the aluminum native corroding and losing strength. The thickness and also other nature of the oxide layer have the right to be changed by making use of the anodizing process. Aluminum oxide is also a product that the aluminum smelting process.

Corundum Gemstones

The most usual crystalline kind of aluminum oxide is corundum. Both rubies and sapphires are gem-quality creates of corundum. Lock owe your distinctive colour to map impurities. Rubies get their deep red color and also laser characteristics from traces that chromium. Sapphires come in a selection of colors, i beg your pardon come from various other impurities choose iron and also titanium. The hardness of various kinds of corundum makes them perfect for usage as abrasives and as materials in cutting tools.

Uses in Ceramics

Aluminum oxide, likewise called alumina, is offered in engineering ceramics. It’s hard and also wear-resistant, resists strikes by both acid and alkali substances, has actually high strength and also stiffness, and also has great thermal conductivity, which makes it valuable in manufacturing a range of various ceramic products. These incorporate things favor high-temperature electrical and voltage insulators, instrumentation parts for thermal test machines, seal rings, gas laser tubes, and other laboratory equipment. Aluminum oxide is likewise used in the production of ballistic armor.

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Other Uses

Because aluminum oxide is fairly inert chemically, white, and relatively non-toxic, it serves together filler in plastics. It’s additionally a typical ingredient in sunscreen. Since of that hardness and strength, it’s offered as an abrasive, including in sandpaper and also as a much less expensive instead of for commercial diamonds. Some CD and DVD sprucing up kits save aluminum oxide. The same qualities make the a good ingredient in toothpaste. Dentists usage aluminum oxide as a sprucing up agent to remove dental stains.

Aluminum oxide has actually a variety of various purposes. The most vital one is in the production of metallic aluminum, yet this is absolutely not the just one. Though you might not understand it, both rubies and sapphires room composed of aluminum oxide, making it a very an important element!

Formula for Aluminum Oxide


Properties for Aluminum Oxide Molar mass: 101.96 g·mol−1 melt point: 2,072 °C (3,762 °F; 2,345 K) boiling point: 2,977 °C (5,391 °F; 3,250 K) Density: 3.95–4.1 g/cm3