Abstract: The invention relates to diamond coatings and the growth of diamond coatings suitable for tools, wear parts, and the like. The invention produces polycrystalline coatings having progressively finer grain size in the direction of the outer surface, which enhance the wear resistance and finish characteristics of the parts and tools. In an embodiment, chemical vapor deposition grows a first region over a substrate with a plurality of nucleation sites and the first region transitions into polycrystalline diamond grains growing progressively smaller to an average grain size of less than three microns.

Abstract: Rough, conductive diamond film regions are formed on a substrate for establishing electrical contact with a surface mount semiconductor package, or the like. The substrate base is heated in a diamond film gas phase deposition reactor. Molecular hydrogen, a carbon-bearing gas and a dopant source are introduced into the reactor at a temperature conducive to producing a conductive polycrystalline diamond film with sharp facets extending from the film. The diamond film is patterned by etching to remove regions where no electrical contact with the surface mount package is desired.

Abstract: The invention relates to diamond coatings and the growth of diamond coatings suitable for tools, wear parts, and the like. The invention produces polycrystalline coatings having progressively finer grain size in the direction of the outer surface, which enhance the wear resistance and finish characteristics of the parts and tools. In one embodiment, chemical vapor deposition grows a first region over a substrate with a plurality of nucleation sites and the first region transitions into polycrystalline diamond grains growing progressively smaller to an average grain size of less than three microns.