Cvd diamond for coating twist drills

Details Cvd diamond for coating twist drills Cvd diamond for coating twist drills

C - Chemistry, Metallurgy

23

C

C23C 16/26 (2006.01) B23P 5/00 (2006.01) B27G 15/02 (2006.01) C23C 16/27 (2006.01) C23C 16/458 (2006.01)

Patent

CA 2046817

60SD00498 CVD DIAMOND FOR COATING TWIST DRILLS ABSTRACT OF THE DISCLOSURE The present invention enables the diamond coating of stationary elongate objects, such as twist drills, with a continuous uniform film without any motion of the twist drill due to the unexpected superb "throwing power" of a reactor disclosed herein. The CVD diamond reactor includes a vacuum chamber, inlet for feed hydrogen/hydrocarbon mixtures, and an outlet, in conventional fashion. The improvement for coating with CVD diamond the entire outer surface of at least a portion of a plurality of stationary elongate objects comprises disposed within said reactor, an elongate metal tube having a plurality of apertures for holding elongate objects disposed radially inwardly and having a cooling pipe in thermal contact with and disposed about the outside of said metal tube; and a filament running within said tube along its lengthwise extent and being in electrical connection with the source of voltage for heating said filament to a temperature adequate to initiate hydrocarbon disassociation, the portions of said elongate object within said tube surrounding said filament being heated thereby.

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