Alumina (Aluminium Oxide) is the most widely used oxide ceramic material. Its applications are widespread, and include spark plugs, tap washers, abrasion resistant tiles, and cutting tools.
Very large tonnages are also used in the manufacture of monolithic and brick refractories. It is also mixed with other materials such as flake graphite for other, more difficult applications are envisaged, such as pouring spouts and sliding gate valves.
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Key Properties
Aluminium oxides key properties are shown below.
- High compression strength
- High hardness
- Resistant to abrasion
- Resistant to chemical attack by a wide range of chemicals even at elevated temperatures
- High thermal conductivity
- Resistant to thermal shock
- High degree of refractoriness
- High dielectric strength
- High electrical resistivity even at elevated temperatures
- Transparent to microwave radio frequencies
- Low neutron cross section capture area
- Raw material readily available and price not subject to violent fluctuation
Annual Production
Annual production of aluminum oxide is 45 million tonnes. 90% of this is used in the manufacture of aluminium metal by electrolysis.
Where Does Alumina Come From?
Most of the aluminium oxide produced commercially is obtained by the calcination of aluminium hydroxide (frequently termed alumina trihydrate or ATH).
The aluminium hydroxide is virtually all made by the Bayer Process.
This involves the digestion of bauxite in caustic soda and the subsequent precipitation of aluminium hydroxide by the addition of fine seed crystals of aluminium hydroxide.
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