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    PROTECTIVE OVERLAY COATING FOR PDC DRILL BITS
    12.
    发明专利
    PROTECTIVE OVERLAY COATING FOR PDC DRILL BITS 未知

    公开(公告)号：CA2409554A1

    公开(公告)日：2003-04-25

    申请号：CA2409554

    申请日：2002-10-24

    Applicant: SMITH INTERNATIONAL

    Inventor： OLDHAM THOMAS W ,  KEMBAIYAN KUMAR T

    IPC: B23K31/02 ,  E21B10/54 ,  E21B10/55 ,  E21B10/08

    Abstract: In one embodiment, a method of increasing a durability of a drill bit having a bit body with at least one blade disposed thereon, at least one cutter pocket disposed on the blade, and at least one cutter disposed in the cutter pocket is disclosed. The method includes brazing the at least one cutter to the at least one cutter pocket so that a braze material disposed between the at least one cutter pocket and the at least one cutter comprises an exposed surface, and overlaying at least a portion of the exposed surface with a hardfacing material, wherein the hardfacing material includes a binder having a melting point selected to avoid damaging the cutter. In one embodiment, a rock bit includi ng a matrix bit body having at least one blade thereon, at least one cutter pocket disposed on the blade, at least one cutter disposed in the cutter pocket, a braze material disposed between the cutter and the pocket, the braze material havi ng an exposed surface, and an overlay coating applied proximate to the at least one cutter, wherein the overlay coating is adapted to cover an exposed surface o f braze material proximate to the at least one cutter is disclosed.

    Thermally stable diamond polycrystalling diamond constructions
    15.
    发明专利
    Thermally stable diamond polycrystalling diamond constructions 未知

    公开(公告)号：IE20110189A1

    公开(公告)日：2011-07-20

    申请号：IE20110189

    申请日：2005-09-20

    Applicant: SMITH INTERNATIONAL

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

    IPC: B22F7/00 ,  C22C26/00 ,  E21B1/00

    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 0.02mm to a depth of less than about 0.09mm. The diamond body includes diamond crystals having an average diamond grain size of greater than about 0.02mm, 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.

    A polycrystalline diamond body whose surface is free of group VIII metals
    19.
    发明专利
    A polycrystalline diamond body whose surface is free of group VIII metals 未知

    公开(公告)号：GB2464866A

    公开(公告)日：2010-05-05

    申请号：GB201001703

    申请日：2005-09-21

    Applicant: SMITH INTERNATIONAL

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

    IPC: E21B10/46 ,  B22F7/00 ,  B22F7/06 ,  C22C26/00 ,  E21B10/567

    Abstract: A polycrystalline diamond body 57 has a top surface 52 and a side surface 58. The body is made from bonded diamond crystals. The body is attached to a substrate 60. There is a region 56 where the gaps between the crystals are free of a group VIII metal. There is another region where the gaps between the crystals contain a group VIII metal. The region free of the metal extends over the top surface and at least half of the side surfaces of the body; it is between 0.02mm and 0.09mm deep. The separate regions can be formed by treating only a portion of a body whose gaps initially all contain the metal. Leaching is one such treatment. The group VIII transition metal could be a catalyst for sintering the diamond crystals.

    A polycrystalline diamond body whose surface is free of group VIII metals
    20.
    发明专利
    A polycrystalline diamond body whose surface is free of group VIII metals 未知

    公开(公告)号：GB2464864A

    公开(公告)日：2010-05-05

    申请号：GB201001691

    申请日：2005-09-21

    Applicant: SMITH INTERNATIONAL

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

    IPC: E21B10/46 ,  B22F7/00 ,  B22F7/06 ,  C22C26/00 ,  E21B10/567

    Abstract: A polycrystalline diamond body 57 has a top surface 52 and a side surface 58. The body is made from bonded diamond crystals. The body is attached to a metallic substrate 60. There is a region 56 where the gaps between the crystals are free of a group VIII metal. There is another region where the gaps between the crystals contain a group VIII metal. The region free of the metal may extend over various sections of the top and side surfaces of the body; it may be in the region of 0.04-0.08mm deep. The separate regions can be formed by treating only a portion of a body whose gaps initially all contain the metal. Leaching is one such treatment. The group VIII transition metal could be a catalyst for sintering the diamond crystals.

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