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US 5,011,515 AGranted
Composite polycrystalline diamond compact with improved impact resistance
OwnerRobert H. Frushourinventor
Life of this patent
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Abstract
A compact blank for use in operations that require very high impact strength and abrasion resistance is disclosed. The compact comprises a substrate formed of tungsten carbide or other hard material with a diamond or cubic boron nitride layer bonded to the substrate. The interface between the layers is defined by topography with irregularities having non-planar side walls such that the concentration of substrate material continuously and gradually decreases at deeper penetrations into the diamond layer.
Claims6
A cutting element comprising:
- a substrate having a first surface;
- the first surface being formed with surface irregularities having angularly disposed sidewalls in which the spacing between adjacent surface irregularities is less at the base of such irregularities than at the top end of such irregularities at the first surface of the substrate;
- and
- a polycrystalline material layer having a cutting surface and an opposed mounting surface joined to the substrate, the mounting surface having surface irregularities complimentary to and contacting the surface irregularities in the substrate;
- and wherein
- the concentration of the higher thermal expansion material substrate continuously and gradually decreases from the substrate into the lower thermal expansion polycrystalline material layer through the region of the surface irregularities.
3 more elements
Dependencies are inferred from the claim text.