Cutting elements for rotary drill bits
OwnerNigel D. Griffininventor
Life of this patent
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Abstract
A cutting element for a rotary drill bit comprises a thin superhard table of polycrystalline diamond material, defining a front cutting face, bonded to a less hard substrate. The substrate is formed from a material containing at least a proportion of tungsten metal. The substrate may be formed of a metal matrix composite comprising tungsten metal particles in a metal binder phase comprising material selected from: Cu, Co, Ni+Cu, Ni+Fe, Ni+Fe+Mo, Co+Ni. The substrate may also include tungsten carbide in which case the tungsten metal may be replaced by another softer refractory material.
Claims15
A cutting element for a rotary drill bit comprising a thin superhard table of polycrystalline diamond material, defining a front cutting ace, bonded to a less hard substrate, wherein the substrate is formed from a material comprising at least about 50% (by weight) tungsten metal.
A cutting element for a rotary drill bit comprising a thin hard facing table of polycrystalline diamond material, defining a front cutting face, bonded to a less hard substrate, wherein the substrate comprises a compound of cemented tungsten carbide particles and particles of a refractory material which is softer than tungsten carbide, the particles of refractory material being sufficient to substantially reduce the abrasion resistance of the cemented tungsten carbide alone.
A cutter assembly for a rotary drill bit comprising a cutting element mounted on a carrier in the form of a stud to be received in a socket in the bit body, the cutting element comprising a thin superhard table of polycrystalline diamond material, defining a front cutting face, bonded to a less hard substrate, the substrate being formed from a material comprising at least about 50% (by weight) tungsten metal and being bonded to a surface on the stud.
A cutter assembly for a rotary drill bit comprising a cutting element mounted on a carrier in the form of a stud to be received in a socket in the bit body, the cutting element comprising a thin superhard table of polycrystalline diamond material, defining a front cutting face, bonded to a less hard substrate, the substrate being bonded to a surface on the stud and comprising a compound of cemented tungsten carbide particles and particles of a refractory material which is softer than tungsten carbide, the particles of refractory material being sufficient to substantially reduce the abrasion resistance of the cemented tungsten carbide alone.
Dependencies are inferred from the claim text.