Method of producing fine coated tungsten carbide particles
AssigneePowdermet, Inc.
InventorsAndrew J. Sherman, Animesh Bose
Life of this patent
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Abstract
Geldhart class C tungsten carbide particles are provided with a discontinuous coating of grain growth inhibitor. Further, the fine tungsten carbide coatings are preferably provided with a continuous coating of another discreet phase material, such as, for example, a continuous coating of cobalt. Compacts produced using such materials are particularly useful as WC—Co hardmetals wherein the compacts are extremely fine grained.
Claims13
A composite tungsten carbide particle comprising:
- a tungsten carbide core particle having an outer surface and an effective amount of a substantially uniformly distributed discontinuous coating of grain growth inhibitor on said outer surface and encapsulated within a continuous binder phase.
A composite tungsten carbide particle comprising:
- a tungsten carbide core particle having an outer surface and a continuous diffusion barrier coating on said outer surface of said particle and a hardphase coating different from said diffusion barrier coating over said diffusion barrier.
A composite tungsten carbide particle comprising:
- a tungsten carbide core particle having an outer surface and a continuous diffusion barrier-grain growth inhibitor coating on said outer surface, a hardphase coating over and different from said diffusion barrier-grain growth inhibitor coating, and a continuous encapsulating coating of cobalt.
A composite tungsten carbide particle comprising:
- a tungsten carbide core particle having an outer surface and a continuous diffusion barrier-grain growth inhibitor coating of tantalum carbide on said outer surface, a titanium carbide hardphase coating over said diffusion barrier-grain growth inhibitor coating, and a continuous outer coating of cobalt.
A Geldhart class C composite tungsten carbide particle comprising:
- a Geldhart class C tungsten carbide core particle having an outer surface and a substantially uniformly distributed discontinuous coating of an effective amount of grain growth inhibitor on said outer surface, and encapsulated within a continuous outer coating of cobalt.
A composite tungsten carbide particle comprising:
- a tungsten carbide core particle having an outer surface and a substantially uniformly distributed discontinuous coating of an effective amount of grain growth inhibitor and a hardphase coating on said outer surface, said grain growth inhibitor being different from said hardphase, and being encapsulated within a continuous outer coating of cobalt.
A Geldhart class C composite tungsten carbide particle comprising:
- a Geldhart class C tungsten carbide core particle having an outer surface and a substantially uniformly distributed discontinuous coating of an effective amount of grain growth inhibitor and a hardphase coating on said outer surface, said grain growth inhibitor being different from said hardphase, and said Geldhart class C tungsten carbide core particle grain growth inhibitor and hardphase being encapsulated within a continuous outer coating of cobalt.
A process of producing a composite tungsten carbide particle comprising:
- selecting a tungsten carbide core particle having an outer surface;
- applying an effective amount of a substantially uniformly distributed discontinuous coating of grain growth inhibitor to said outer surface;
- and
- applying a continuous coating of cobalt to said core particle.
A process of producing a composite tungsten carbide particle comprising:
- selecting a tungsten carbide core particle having an outer surface;
- applying a coating of at least one carbide forming metal to said outer surface of said core particle;
- carburizing said coating to form at least one metallic carbide coating on said outer surface and recovering a metal carbide coated tungsten carbide particle;
- and
- applying a continuous coating of cobalt to said metal carbide coated tungsten carbide particle.
A process of producing a composite tungsten carbide particle comprising:
- selecting a tungsten carbide core particle having an outer surface;
- applying a continuous coating of a diffusion barrier to said outer surface of said core particle;
- applying a coating of a material that is different from said diffusion barrier and is reactive with said tungsten carbide core particle and recovering a coated particle;
- and
- applying a continuous coating of cobalt to said coated particle.
A process of producing a composite tungsten carbide particle comprising:
- selecting a tungsten carbide core particle having an outer surface;
- applying an effective amount of a substantially uniformly distributed discontinuous coating of grain growth inhibitor to said outer surface;
- applying a coating of hardface material to said surface, said hardface material being different from said grain growth inhibitor and recovering a coated particle;
- and
- applying a continuous coating of cobalt to said coated particle.
A process of producing a composite tungsten carbide particle comprising:
- selecting a Geldhart class C tungsten carbide core particle having an outer surface;
- applying an effective amount of a substantially uniformly distributed discontinuous coating of grain growth inhibitor to said outer surface;
- and
- applying a continuous coating of cobalt to said core particle.
Dependencies are inferred from the claim text.