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    Ultra hard material cutter with shaped cutting surface
    22.
    发明专利
    Ultra hard material cutter with shaped cutting surface 未知

    公开(公告)号：GB2369841A

    公开(公告)日：2002-06-12

    申请号：GB0127857

    申请日：2001-11-21

    Applicant: SMITH INTERNATIONAL

    Inventor： MIDDLEMISS STEWART ,  EYRE RONALD K

    IPC: B23C5/20 ,  C04B37/02 ,  E21B10/56 ,  E21B10/567 ,  E21B10/573 ,  E21B10/46

    Abstract: A cylindrical cutting element comprises a substrate 2 provided with a face of ultra hard material 4 at one end. At the interface 3 between the substrate and the ultra hard material is a first concave depression 34 which extends radially outwards from near the centre of the element to the outer edge. A second depression 12, formed on the surface 5 of the ultra hard material 4, also extends radially from near the centre and may be aligned over the first depression 34. The first and second depressions may increase in width and depth as they extend radially outwards. Further depressions may be formed on the interface and the exposed surface of the ultra hard material. In addition, smaller, secondary depressions (38, figures 5 and 6) may be made around the first and second depressions 34 and 12. Transition layers (42, figure 7) may be placed between the substrate and the ultra hard material, having properties intermediate the two, and a circumferential groove (68, figure 9) may be formed in the outer surface of the substrate 2 and filled with additional ultra hard material.

    Method for forming a polycrystalline layer of ultra hard material
    25.
    发明专利
    Method for forming a polycrystalline layer of ultra hard material 未知

    公开(公告)号：AU7360096A

    公开(公告)日：1997-03-27

    申请号：AU7360096

    申请日：1996-09-09

    Applicant: SMITH INTERNATIONAL

    Inventor： ANDERSON NATHAN R ,  EYRE RONALD K ,  KESHAVAN MADAPUSI K ,  RAI GHANSHYAM

    IPC: B24D3/00 ,  B24D3/06 ,  B24D3/28 ,  B24D18/00 ,  B32B18/00 ,  C04B41/87 ,  C04B41/89 ,  B32B31/20 ,  B32B31/12 ,  B24D11/00 ,  B24B1/00

    Abstract: A polycrystalline diamond layer is bonded to a cemented metal carbide substrate by this process. A layer of dense high shear compaction material including diamond or cubic boron nitride particles is placed adjacent to a metal carbide substrate. The particles of diamond have become rounded instead of angular due to high shear compaction in a multiple roller process. The volatiles in the high shear compaction material are removed and binder decomposed at high temperature, for example, 950 DEG C., leaving residual amorphous carbon or graphite in a layer of ultra hard material particles on the carbide substrate. The substrate and layer assembly is then subjected to a high pressure, high temperature process, thereby sintering the ultra hard particles to each other to form a polycrystalline ultra hard layer bonded to the metal carbide substrate. The layer of high shear compaction material is also characterized by a particle size distribution including larger and smaller particles that are distributed uniformly throughout the layer.

    THERMALLY STABLE DIAMOND POLYCRYSTALLINE DIAMOND CONSTRUCTIONS
    26.
    发明专利
    THERMALLY STABLE DIAMOND POLYCRYSTALLINE DIAMOND CONSTRUCTIONS 未知

    公开(公告)号：CA2520319C

    公开(公告)日：2014-02-11

    申请号：CA2520319

    申请日：2005-09-21

    Applicant: SMITH INTERNATIONAL

    Inventor： EYRE RONALD K ,  OLDHAM THOMAS W ,  GRIFFO ANTHONY

    IPC: C01B31/06 ,  B22F7/06 ,  C04B35/52 ,  E21B10/46 ,  E21B10/567

    Abstract: Thermally stable diamond constructions comprise a diamond body having a plurality of bonded diamond crystals and interstitial regions disposed among the crystals. A metallic substrate is attached to the diamond body. A working surface is positioned along an outside portion of the diamond body, and the diamond body comprises a first region that is substantially free of a catalyst material that extends a partial depth from a surface into the body, and a second region that includes the catalyst material. The diamond body first region extends from the working surface to depth of at least about 0.02 mm to a depth of less than about 0.09 mm. The diamond body includes diamond crystals having an average diamond grain size of greater than about 0.02 mm, and comprises at least 85 percent by volume diamond based on the total volume of the diamond body. The body can include natural diamond grains and/or a blend of natural and synthetic diamond grains, and is treated to form the first region. Before treatment, a portion of the body to be treated is finished to an approximate final dimension so that the depth of the first region of the finished product is substantially the same as when treated. During treatment, catalyst materials as well as non-catalyst metallic materials are removed from the diamond body to provide a further enhanced degree of thermal stability.

    Selective leaching of cutters
    28.
    发明专利
    Selective leaching of cutters 未知

    公开(公告)号：GB2488675A

    公开(公告)日：2012-09-05

    申请号：GB201203893

    申请日：2012-03-05

    Applicant: SMITH INTERNATIONAL

    Inventor： BELNAP DANIEL J ,  CARIVEAU PETER THOMAS ,  CORBETT LOEL ,  EYRE RONALD K

    IPC: E21B10/567 ,  C04B41/53 ,  E21B10/55

    Abstract: A thermally stable cutter 221 is produced by placing a polycrystalline diamond diamond body 221a attached to a carbide substrate 221b into a leaching agent within a pressure vessel 200 and subjecting it to an elevated temperature and pressure to remove catalyzing material from interstitial spaces interposed between diamond particles, although a portion of the carbide substrate attached to the PCD body is deposited into a receiving mechanism 219 having a retention mechanism 223 which prevents leaching agent from contacting at least a portion of the carbide substrate. Retention mechanisms 223 may include O-rings, a pressure flange 223, a ceramic ring 223 and/or press-fitting and additionally vacuum sealing 225 cutting elements 221 into receiving cups 219 in the vessel liner 217. Additional mechanical devices may be used such as retention/positioning pins 227 and the receiving mechanisms may further comprise elastomer pressure plates 231, threaded pressure nuts 233 and/or pressure sleeves 235.

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