Polycrystalline diamond element

C - Chemistry – Metallurgy – 22 – C

Patent

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Details

C22C 26/00 (2006.01) E21B 10/567 (2006.01)

Patent

CA 2754150

An embodiment of a PCD insert comprises an embodiment of a PCD element joined to a cemented carbide sub-strate at an interface. The PCD element has internal diamond surfaces defining interstices between them. The PCD element further comprises a working surface and a low melting point region adjacent the working surface in which the interstices are at least par-tially filled with a low melting point metallic material having a melting point of less than about 1,300 degrees centigrade at atmo-spheric pressure, or less than about 1,200 degrees centigrade at atmospheric pressure. The PCD element includes an intermediate region, the interstices of the intermediate region being at least partially filled with a catalyst material for diamond.

Un mode de réalisation d'un insert PCD comprend un mode de réalisation d'un élément de PCD assemblé à un substrat de carbure cimenté au niveau d'une interface. L'élément de PCD possède des surfaces de diamant internes définissant des interstices entre elles. L'élément de PCD comprend en outre une surface de travail et une région à bas point de fusion adjacente à la surface de travail dans laquelle les interstices sont au moins partiellement comblés par un matériau métallique à bas point de fusion ayant un point de fusion inférieur à environ 1 300 degrés centigrade à pression atmosphérique, ou inférieur à environ 1 200 degrés centigrade à pression atmosphérique. L'élément de PCD comprend une région intermédiaire, les interstices de la région intermédiaire étant au moins partiellement comblés par un matériau de catalyseur pour diamant.

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