Polycrystalline diamond member and method of making the same

Details Polycrystalline diamond member and method of making the same Polycrystalline diamond member and method of making the same

C - Chemistry, Metallurgy

23

C

C23C 16/04 (2006.01) C04B 41/53 (2006.01)

Patent

CA 2346945

A polycrystalline diamond member (60) and a method for making the same. The member (60) includes a backing and a layer of polycrystalline diamond (64) on the backing (62) wherein the layer of polycrystalline diamond (64) has a rake surface (80) and a flank surface (82). The layer of polycrystalline diamond (64) has an interior region (68) adjacent to the backing and an exterior region (66) adjacent to the interior region (68) wherein the exterior region (66) terminates at the rake surface (80). The interior region (68) includes interior diamond particles (70) and a catalyst (76) with the interior diamond particles (70) being bridged together so as to form interstices therebetween. The catalyst (76) is at the interstices of the interior diamond particles. The exterior region (66) includes exterior diamond particles (70) bridged together so as to form interstices therebetween with the exterior region (66) being essentially free of the catalyst. A chemical vapor deposition-applied hard material (74) essentially surrounds the exterior diamond particles (70).

La présente invention concerne un élément à diamant polycristallin (60) et son procédé de fabrication. L'élément (60) comprend un support et une couche de diamant polycristallin (64) sur ce support (62) dans lequel la couche de diamant polycristallin (64) présente une surface de dépouille (80) et une surface de flanc (82). La couche de diamant polycristallin (64) possède une région intérieure (68) adjacente au support et une région extérieure (66) adjacente à la région intérieure (68) et dans laquelle la région extérieure (66) se termine à la surface de dépouille (80). La région intérieure (68) comprend des particules de diamant intérieures (70) et un catalyseur (76), les particules de diamant intérieures (70) étant pontées ensemble de manière à former des interstices entre elles. Le catalyseur (76) se trouve dans les interstices formés par les particules de diamant intérieures. La région extérieure (66) comprend des particules de diamant extérieures (70) pontées ensemble de manière à former entre elles des interstices, cette région extérieure (66) ne contenant pratiquement pas de catalyseur. Un matériau dur (74) appliqué au moyen de dépôt chimique en phase vapeur entoure essentiellement les particules de diamant extérieures (70).

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