Hard tip and method for producing the same

Details Hard tip and method for producing the same Hard tip and method for producing the same

C - Chemistry, Metallurgy

22

C

C22C 29/08 (2006.01) B22F 7/06 (2006.01)

Patent

CA 2667323

A superhard tip which has wearing resistance on the edge side and has toughness on the bonding side. The superhard tip is made of a superhard alloy having a composition in which the proportion of WC to Co is substantially even from the edge side to the bonding side. The alloy has a gradient composition in which the content of a binder metal increases from the edge side to the bonding side, the binder metal being one which does not form a eutectic structure with WC or one which has a WC eutectic point higher than the eutectic point for the WC-Co superhard alloy and has a melting point not lower than the liquid-phase sintering temperature of the WC-Co superhard alloy.

L'invention concerne une pointe super dure ayant une résistance à l'usure sur le côté de bordure et ayant une ténacité sur le côté de liaison. La pointe superdure est faite d'un alliage superdur ayant une composition dans laquelle la proportion de WC à Co est sensiblement régulière du côté de bordure au côté de liaison. L'alliage comprend une composition de gradient dans laquelle la teneur d'un métal liant augmente du côté de bordure au côté de liaison, le métal liant étant un métal ne formant pas de structure eutectique avec WC et un ayant un point eutectique avec WC supérieur au point eutectique pour l'alliage superdur WC-Co et un point de fusion non inférieur à la température de frittage en phase liquide de l'alliage superdur WC-Co.

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