Patent ID: 7790003

Claim:
A method for depositing a nanostructured metal coating on an interior surface of a hollowed copper-containing workpiece comprising: providing said hollowed copper-containing workpiece comprising an interior surface to be coated and a cylindrical bore having a longitudinal axis; providing a sputter target material comprising one or more metals having a longitudinal bore substantially coextensive with said longitudinal axis; positioning said workpiece, said sputter target material, and a magnet assembly in a vacuum chamber, whereby said sputter target material is disposed substantially within said workpiece and said magnet assembly is disposed substantially within said sputter target material; providing to said vacuum chamber a gas suitable for forming plasma; reducing the pressure of said vacuum chamber; rotating said magnet assembly relative to said sputter target material; and generating a circumferentially directed magnetic field with said magnet assembly proximate said sputter target material, thereby ionizing said gas to produce plasma thereof, whereby bombardment of said sputter target material by said plasma causes particles of said sputter target material to be directed toward and deposited on said interior surface, thereby forming a nanostructured coating comprising particles of copper and chromium, wherein said coating includes 1) chromium present in the range of between about 5 wt % to about 30 wt % in a layer adjacent to the workpiece; 2) multiple layers comprising copper and chromium sequentially deposited or a series of layers comprising copper and chromium and/or chromium sequentially deposited; and 3) a top layer comprising chromium present from between about 30 wt % to about 95 wt %.