C - Chemistry – Metallurgy – 04 – B
Patent
C - Chemistry, Metallurgy
04
B
C04B 35/52 (2006.01) B22F 7/06 (2006.01) C04B 37/02 (2006.01) E21B 10/42 (2006.01) E21B 10/46 (2006.01) E21B 10/50 (2006.01) E21B 10/56 (2006.01)
Patent
CA 2423102
The present invention provides a superhard polycrystalline diamond or diamond- like element with greatly improved resistance to thermal degradation without loss of impact strength. Collectively called PCD elements, these elements are formed with a binder-catalyzing material in a high-temperature, high-pressure process. The PCD element has a plurality of partially bonded diamond or diamond-like crystals forming at least one continuous diamond matrix, and the interstices among the diamond crystals forming at least one continuous interstitial matrix containing a catalyzing material. The element has a working surface and a body, where a portion of the interstitial matrix in the body adjacent to the working surface is substantially free of the catalyzing material, and the remaining interstitial matrix contains the catalyzing material. This translates to higher wear resistance in cutting applications, higher heat transfer capacity in heat sink applications, and has advantages in numerous other applications including hollow dies, indentors, tool mandrels, and wear elements.
L'invention porte sur un diamant ou simili-diamant polycristallin super dur dit PCD présentant une très grande résistance aux dégradations causées par la chaleur, sans perte de résistance aux chocs. Les PCD, obtenus en soumettant un mélange de liant et de catalyseur à de fortes températures et pressions, sont constitués de cristaux de diamant ou simili-diamant formant au moins une matrice continue de diamant continue tandis que les interstices entre les cristaux forment au moins une matrice interstitielle continue contenant un catalyseur. Un PCD présente un corps et une surface de travail; la partie de la matrice interstitielle du corps jouxtant la surface de travail est quasiment exempte de catalyseur tandis que le reste de la matrice interstitielle contient le catalyseur, ce qui se traduit par une plus grande résistance dans les travaux de coupe une capacité d'évacuation de la chaleur accrue et de nombreuses autres utilisations telles que des filières creuses, des poinçons, des mandrins d'outils ou des éléments soumis à l'usure.
Griffin Nigel Dennis
Hughes Peter Raymond
Camco International (uk) Limited
Marks & Clerk
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