Patents Assigned to St. Gobain/Norton Industrial Ceramics Corporation
  • Method of making a diamond-coated composite body
    Patent number: 5635256
    Abstract: At least the surface region of a cutting tool substrate made of tungsten carbide in a cobalt matrix is carburized to chemically passivate the cobalt prior to deposition of diamond film on it. The passivation improves adhesion by preventing reaction of the cobalt with the diamond in the course of the deposition process. To further improve adhesion of the diamond, cobalt is removed from the exposed surfaces of the tungsten carbide grains by heat treatment in inert gas or by hydrogen plasma.
    Type: Grant
    Filed: April 17, 1996
    Date of Patent: June 3, 1997
    Assignee: St. Gobain/Norton Industrial Ceramics Corporation
    Inventor: James M. Olson