Patent ID: 8105660

Claim:
A method of forming a diamond-like carbon coating by plasma enhanced chemical vapor deposition on an internal surface of a hollow component having an inner surface, the method comprising the steps of: (a) creating a reduced atmospheric pressure within a hollow component to be treated; (b) introducing a diamondoid precursor gas to the interior of said hollow component; (c) establishing a bias voltage between a first electrode and one or more second electrodes, at least one of said one or more second electrodes being externally offset from an opening of said component by a hollow insulator that is attached to said hollow component; and (d) establishing a plasma region adjacent an inner surface of said hollow component, said plasma region extending through the hollow insulator; wherein said diamondoid precursor gas comprises at least one diamondoid and wherein said pressure and bias voltage are selected such as to cause the deposition of diamond-like carbon on said surface.