Alloys, such as:
----Superalloys, for parts in gas turbine aircraft engines. -
----Corrosion- and wear-resistant alloys.
----High speed steels.
-Cemented carbides and diamond tools.
-Magnets and magnetic recording media.
-Catalysts for the petroleum and chemical industries.
-Electroplating because of its appearance, hardness, and resistance to oxidation.
-Drying agents for paints, varnishes, and inks.
-Ground coats for porcelain enamels.
-Cobalt blue glass
-Lithium ion battery electrodes.
-Steel-belted radial tires.
-Cobalt-60 has multiple uses as a gamma ray source:
----It is used in radiotherapy.
----It is used in radiation treatment of foods for sterilization .
----It is used in industrial radiography to detect structural flaws in metal parts.
Co-60 is useful as a gamma ray source partially because it can be produced - in known quantity, and very large amounts - by simply exposing natural cobalt to neutrons in a reactor for a given time.
-Use in medicine
Cobalt-60 is a radioactive metal that is used in radiotherapy. It produces two gamma rays with energies of 1.17 MeV and 1.33 MeV. The 60Co source is about 2 cm in diameter and as a result produces a geometric penumbra, making the edge of the radiation field fuzzy. The metal has the unfortunate habit of producing a fine dust, causing problems with radiation protection. The 60Co source is useful for about 5 years but even after this point is still very radioactive, and so cobalt machines have fallen from favor in the Western world where linacs are common.