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cobalt chromium molybdenum is an alloy that contains a significant proportion of chromium and tungsten. Stellite, one such type of alloy, is used in nuclear power plant piping and valve seats to hardface the seat surfaces and prevent wear. It is also used in aerospace components to withstand high temperatures and pressures. Because of its ferromagnetic properties, it is useful in producing permanent magnets. Stellite can also be activated in the neutron flux of a nuclear reactor and become cobalt-60, which has a five year half life and releases very energetic gamma rays.
The main disadvantage of these cobalt/chromium alloys is their low capacity for deformation or ductility. This is usually expressed in terms of the elongation at rupture. In order to avoid breaking they must be treated with care when bending or straightening. This is especially important when used in medical fields where they are involved in the construction of prosthetic structures and dental implants.
These materials have good corrosion resistance and can withstand abrasion. They are also very strong and have good elastic properties, even at elevated temperatures. This is especially important for medical applications where they must withstand heavy mechanical loads and constant contact with human tissue. Cobalt/chromium alloys also have smaller magnetic fields than other metals and therefore can produce fewer artifacts when scanned with MRI machines.
CoCrMo alloy powder can be made with a wide range of constituents and can be processed in many ways including laser/electronic beam additive manufacturing (SLM / EBM), powder metallurgy (PM), spraying and welding. The resulting powder has excellent batch stability, sphericity and low oxygen content and can be used in laser/electronic beam additive manufacturing of biomedical materials for dental and prosthetic structures.