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公开(公告)号：IE86188B1
公开(公告)日：2013-05-22
申请号：IE20050623
申请日：2005-09-20
Applicant: SMITH INTERNATIONAL
Inventor： EYRE RONALD K , OLDHAM THOMAS W , GRIFFO ANTHONY
IPC: E21B10/46 , B22F7/06 , 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.
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公开(公告)号：IE20120262A1
公开(公告)日：2013-05-22
申请号：IE20120262
申请日：2005-09-20
Applicant: SMITH INTERNATIONAL
Inventor： EYRE RONALD K , OLDHAM THOMAS W , GRIFFO ANTHONY
Abstract: Thermally stable diamond constructions comprise a diamond body having a plurality of bonded diamond 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 0.02mm, 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.
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公开(公告)号：IE20110190A1
公开(公告)日：2011-07-20
申请号：IE20110190
申请日：2005-09-20
Applicant: SMITH INTERNATIONAL
Inventor： OLDHAM THOMAS W , GRIFFO ANTHONY , EYRE RONALD K
Abstract: Thermally stable diamond constructions comprise a diamond body having a plurality of bonded diamond crystals and interstitial rehions 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.
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公开(公告)号：GB2464865A
公开(公告)日：2010-05-05
申请号：GB201001698
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 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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公开(公告)号：GB2436974A
公开(公告)日：2007-10-10
申请号：GB0707821
申请日：2005-10-10
Applicant: SMITH INTERNATIONAL
Inventor： LOCKWOOD GREGORY T , OLDHAM THOMAS W , GRIFFO ANTHONY , KESHAVEN MADAPUSI K , CONROY DAVID A
Abstract: A method of forming a diamond impregnated cutting structure such as a cutter insert, involves placing uniformly coated diamond particles in a mould, cold pressing the coated particles and then heating the compacted coated particles with a matrix material to form the diamond impregnated cutting structure. The matrix material can be selected from various metal carbides and nitrides. The heating step may be at between 1500 F and 2100 F and may be a high temperature, high pressure process or an isostatic pressing. The heating step may also comprise a hot-pressing process followed by a high pressure, high temperature process. Also claimed is an insert for a drill bit characterised by a thermally stable shearing portion on a diamond impregnated body, where at least one of the structures has a thermally stable coating.
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Patent Agency Ranking
公开(公告)号：CA2409554C
公开(公告)日：2007-05-22
申请号：CA2409554
申请日：2002-10-24
Applicant: SMITH INTERNATIONAL
Inventor： OLDHAM THOMAS W , KEMBAIYAN KUMAR T
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.
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公开(公告)号：GB2427215A
公开(公告)日：2006-12-20
申请号：GB0610460
申请日：2006-05-26
Applicant: SMITH INTERNATIONAL
Inventor： MIDDLEMISS STEWART N , BELNAP J DANIEL , MOURIK NEPHI , OLDHAM THOMAS W , GRIFFO ANTHONY
Abstract: A compact construct 64 made of an ultra hard material 66 which is substantially free of catalyst material to increase the thermally stability in a region adjacent a working surface and formed from consolidated materials that are thermally stable at temperatures in excess of 750 {C, a metallic substrate 70, and an intermediate material layer 72 used as a barrier to stop migration of materials from the substrate 70 to the ultra hard material body 66. The construct 64 has the advantage of being substantially free of catalyst material at one location, and therefore more thermally stable, but can be brazed to a body at an alternative location on the substrate 70. The thermally stable ultra hard material 66, the intermediate material layer 72, and the substrate 70 are joined together by a high pressure/high temperature process to form a single construct. Additionally disclosed is a method of manufacture.
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公开(公告)号：IE20050623A1
公开(公告)日：2006-09-06
申请号：IE20050623
申请日：2005-09-20
Applicant: SMITH INTERNATIONAL
Inventor： GRIFFO ANTHONY , EYRE K RONALD , OLDHAM THOMAS W
IPC: B01J3/06 , B22F7/06 , C01B31/00 , 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.
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公开(公告)号：GB2397832B
公开(公告)日：2006-03-01
申请号：GB0401258
申请日：2004-01-21
Applicant: SMITH INTERNATIONAL
Inventor： KEMBAIYAN KUMAR THIPPAIYAGOWDE , OLDHAM THOMAS W , ZHANG JOHN YOUHE
Abstract: Drill bit reinforcing members or blanks of this invention are formed from high-strength steels having a carbon content less than about 0.3 percent by weight, a yield strength of at least 55,000 psi, a tensile strength of at least 80,000 psi, a toughness of at least 40 CVN-L, Ft-lb, and a rate of expansion percentage change less than about 0.0025%/° F. during austenitic to ferritic phase transformation. In one embodiment, such steel comprises in the range of from about 0.1 to 0.3 percent by weight carbon, 0.5 to 1.5 percent by weight manganese, up to about 0.8 percent by weight chromium, 0.05 to 4 percent by weight nickel, and 0.02 to 0.8 percent by weight molybdenum. In another example, such steel comprises in the range of from about 0.1 to 0.3 percent by weight carbon, 0.9 to 1.5 percent by weight manganese, 0.1 to 0.5 percent by weight silicon, and one or more microalloying element selected from the group consisting of vanadium, niobium, titanium, zirconium, aluminum and mixtures thereof.
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公开(公告)号：GB2393449B
公开(公告)日：2005-09-28
申请号：GB0322502
申请日：2003-09-25
Applicant: SMITH INTERNATIONAL
Inventor： KEMBAIYAN KUMAR THIPPAIYAGOWDE , OLDHAM THOMAS W
Abstract: A new composition for forming a matrix body which includes spherical sintered tungsten carbide and an infiltration binder including one or more metals or alloys is disclosed. In some embodiments, the composition may include a Group VIIIB metal selected from one of Ni, Co, Fe, and alloys thereof. Moreover, the composition may also include cast tungsten carbide. In addition, the composition may also include carburized tungsten carbide.
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