Coating and Method for its Deposition to Operate in Boundary Lubrication Conditions and at Elevated Temperatures
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United States of America Patent
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Dec 31, 2015
app pub date -
Jun 30, 2015
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Jun 30, 2014
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Abstract
A metal doped carbon coating wherein the Me-doped C coating is for operation in boundary lubrication conditions, in which the metal is present in the coating in an amount of from 5 to 20% by atomic percent, i.e. the ratio of the number of atoms of the metal Me to the number of atoms of the carbon C does not exceed 1:4. The coating is made by pre-treating a workpiece surface by simultaneous bombardment of the surface with accelerated ions of W, Mo and C ions generated by a HIPIMS discharge in a treatment chamber. This is followed by deposition of a transition layer of metal and/or metal nitride of a thickness in the range from 20 nm-1000 nm thick by magnetron sputtering optionally in the form of or including HIPIMS sputtering, the metal being at least one of W and Mo. Thereafter a main layer the main layer of Me-doped C coating is deposited by HIPIMS sputtering.
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