Method for consolidating tough coated hard powders

Details Method for consolidating tough coated hard powders Method for consolidating tough coated hard powders

B - Operations, Transporting

22

F

B22F 1/02 (2006.01)

Patent

CA 2570671

A method of consolidating particulate materials into articles having combinations of properties not available by conventional processes by liquid phase sintering. These particulate materials are comprised of core particles individually coated with layers of a metal compound having a relatively higher fracture toughness than the core, such as WC or TaC. These coated particles include an outer layer comprised a metal, such as Co or Ni. The particles with these coatings are pressed to form an article and the article densified at pressures and temperatures where full density is achieved without the degradation of the material forming the core particle.

L'invention concerne un procédé de renforcement de matériaux particulaires sous forme d'articles présentant des combinaisons de propriétés ne pouvant pas être obtenues au moyen de procédés de frittage en phase liquide. Lesdits matériaux particulaires sont composés de particules de noyau revêtues individuellement de couches d'un composé métallique présentant une ténacité supérieure à celle du noyau, tel que WC ou TaC. Lesdites particules revêtues contiennent une couche extérieure composée de métal tel que Co ou Ni. Les particules pourvues du revêtement sont comprimées de manière à former un article et ledit article est densifié à des pressions et températures auxquelles la pleine densité est obtenue sans dégradation du matériau formant les particules de noyau.

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