Patent ID: 7444955

Claim:
An apparatus for coating surfaces of a workpiece having at least one internal passageway comprising: a plasma source for generating a plasma which includes ions of a coating material to be deposited on said surfaces of said workpiece; a support configured to secure said workpiece in a specific orientation in spaced apart relationship with respect to said plasma source; a plasma flow system enabled to direct a controlled flow of said plasma having said ions from said plasma source into each said internal passageway and to exhaust said plasma from said workpiece when said workpiece is secured to said support; and an ionization excitation system configured to increase ionization said plasma while within said workpiece, said ionization excitation system including a biasing arrangement applied to said workpiece when said workpiece is secured to said support, said ionization excitation system further including a pressure control set to induce oscillation of electrons of said plasma within said workpiece, such that said ionization excitation system is configured to apply hollow cathode techniques within said workpiece.