The system, method and apparatus for improving the wear resistance of the drill bit

摘要

1. A drill bit having! a body having a cutting element and! at least a portion made of a composite comprising crystals of tungsten carbide and a binder, wherein these crystals are essentially spheroidal shape and their distribution in magnitude characterized by a Gaussian distribution. ! 2. The drill bit of claim 1, wherein said at least a portion of the drill bit comprises a component of hard facing on the drill bit, wherein the average grain size of said crystal is in the range from about 0.5 to 8 microns. ! 3. The drill bit of claim 1, wherein the binder is a binder alloy or a transition metal bonding or cobalt alloy containing from about 6 to 8% cobalt. ! 4. The drill bit of claim 1, wherein the composite comprises dvuhtipnye sintered spheroidal granules comprising a plurality of crystals of two different sizes, the size ratio is approximately 7: 1 with providing a composite with tungsten carbide content of about 88%, the crystals have a larger an average value equal to or less than 8 microns and smaller crystals have an average size of about 1 micron. ! 5. The drill bit of claim 1, wherein the composite comprises trehtipnye sintered spheroidal granules comprising a plurality of crystals of three different sizes, the size ratio is approximately 35: 7: 1, with the composite providing a tungsten carbide content higher than 90%, with most crystals have an average size equal to or less than 8 microns, medium size crystals have an average greatness