公开(公告)号：US5988302A

公开(公告)日：1999-11-23

申请号：US903913

申请日：1997-07-31

申请人： Harold A. Sreshta ,  Eric F. Drake

发明人： Harold A. Sreshta ,  Eric F. Drake

IPC分类号： B22F7/06 ,  C22C29/06 ,  C22C33/02 ,  E21B10/50

CPC分类号： C22C33/0292 ,  B22F7/06 ,  C22C29/067 ,  E21B10/50 ,  Y10T428/1209

摘要： A steel tooth rolling cutter earth boring drill bit includes a bit body with a threaded upper end for attachment to the end of a drill string, and a lower end including three legs extending downwardly from the bit body and with a rolling cutter rotatably mounted on each leg. A layer of wear resistant material is applied to a portion of each rolling cutter and comprises wear resistant particles in a substantially steel matrix. The steel matrix is integrally formed with the cutter in a rapid, solid state densification powder metallurgy (RSSDPM) process, and includes a duplex microstructure comprising from about 10 to 40 volume percent austenite and from about 60 to 90 volume percent martensite. The duplex microstructure may be achieved by incorporating a minor fraction of pure nickel and/or manganese powder in the powder mix used in the process, thereby providing nickel or manganese enrichment of the austenitic zones of the matrix.

摘要翻译： 钢齿切割机地钻钻头包括具有用于附接到钻柱的端部的螺纹上端的钻头体，以及包括从钻头体向下延伸的三个腿的下端，并且可旋转地安装在每个 腿。 将一层耐磨材料施加到每个轧制切割机的一部分，并且包括基本上为钢基体的耐磨颗粒。 钢基体与快速固态致密化粉末冶金（RSSDPM）工艺中的刀具一体形成，并且包括含有约10至40体积％奥氏体和约60至90体积％马氏体的双相微观结构。 可通过在工艺中使用的粉末混合物中加入少部分纯镍和/或锰粉末来实现双相组织，由此提供基体的奥氏体区域的镍或锰富集。

公开(公告)号：US06517902B2

公开(公告)日：2003-02-11

申请号：US09827672

申请日：2001-04-06

申请人： Eric F. Drake ,  Harold A. Sreshta ,  Nigel Dennis Griffin

发明人： Eric F. Drake ,  Harold A. Sreshta ,  Nigel Dennis Griffin

IPC分类号： C23C1627

CPC分类号： E21B10/567 ,  B22F2005/001 ,  B22F2998/00 ,  C22C1/1094 ,  E21B10/5673 ,  Y10T428/30 ,  B22F7/06

摘要： A method of thermally treating a preform element, of the kind having a facing table of polycrystalline diamond bonded to a substrate of cemented tungsten carbide, comprises the steps of: (a) heating the element to a soaking temperature of 550-625° C., and preferably about 600° C., (b) maintaining the element at that temperature for at least one hour, and (c) cooling the element to ambient temperature. The resulting preform element has a substrate with a cobalt binder including a substrate interface zone with at least 30 percent by volume of the cobalt binder a hexagonal close packed crystal structure. This reduces the risk of cracking or delamination of the element in use.

摘要翻译： 一种热处理预成型件元件的方法，该预成型件元件具有结合到粘结碳化钨的基底的多晶金刚石的面对台，包括以下步骤：（a）将元件加热到550-625℃的均热温度 ，优选约600℃，（b）将元件保持在该温度下至少1小时，和（c）将元件冷却至环境温度。 所得到的预成型件元件具有包含具有至少30体积％的钴粘合剂的基底界面区域的钴粘合剂的基底，六方密堆积晶体结构。 这降低了使用中的元件的开裂或分层的风险。

公开(公告)号：US09364936B2

公开(公告)日：2016-06-14

申请号：US13271415

申请日：2011-10-12

申请人： Harold A. Sreshta

发明人： Harold A. Sreshta

IPC分类号： B22F3/10 ,  B24D3/06 ,  C22C1/00 ,  E21B10/43 ,  B24D18/00 ,  B24D99/00 ,  B22F3/26 ,  C22C29/08 ,  C22C1/05 ,  C22C1/10 ,  B22F5/00

CPC分类号： B24D3/06 ,  B22F3/26 ,  B22F2005/001 ,  B24D18/0009 ,  B24D99/005 ,  C22C1/00 ,  C22C1/051 ,  C22C1/1036 ,  C22C29/08 ,  E21B10/43

摘要： Composite materials for use with a drill bit for drilling a borehole in earthen formations. The composite material comprises a first pre-infiltrated hardphase constituent and a second pre-infiltrated hardphase constituent. The second pre-infiltrated hardphase constituent is a carbide which comprises at least 0.5 weight % of a binder and at least about 1% porosity. The composite material further comprises an infiltrant.

摘要翻译： 复合材料与钻头一起用于在地层中钻孔。 复合材料包括第一预渗透硬相组分和第二预渗透硬相组分。 第二预渗透硬相组分是包含至少0.5重量％的粘合剂和至少约1％孔隙率的碳化物。 复合材料还包括浸渗剂。

公开(公告)号：US5967248A

公开(公告)日：1999-10-19

申请号：US950286

申请日：1997-10-14

申请人： Eric F. Drake ,  Harold A. Sreshta

发明人： Eric F. Drake ,  Harold A. Sreshta

IPC分类号： B22F7/06 ,  C23C30/00 ,  E21B10/46

CPC分类号： E21B10/46 ,  B22F7/06 ,  C23C30/005 ,  B22F2005/001 ,  B22F2999/00

摘要： Methods of forming a new wear and abrasion overlay formed with the steel surfaces of components for earth boring bits, and the components formed by the methods are disclosed. The overlay comprises a hard material particulate containing a metal carbide and an alloy steel matrix. The volume fraction of the hard material particulate in the overlay is greater than about 75%, the average particle size of the hard material particulate is between about 40 mesh and about 80 mesh, and the thickness of the overlay is less than about 0.050 inches. The process of manufacture includes the steps of fixing a monolayer of hard material particulate to the surface of a flexible mold, filling the mold with materials and powders, and CIP densifying to form a preform. The preform is then forged to near 100% density in a rapid solid state densification powder metallurgy process. The resulting bit component has an integrally formed overlay with superior physical properties.

摘要翻译： 公开了形成用于镗孔钻头的部件的钢表面形成的新的磨损和磨损覆盖层的方法以及由该方法形成的部件。 覆盖层包括含有金属碳化物和合金钢基体的硬质材料颗粒。 覆盖层中硬质材料颗粒的体积分数大于约75％，硬质材料颗粒的平均粒度在约40目至约80目之间，覆盖层的厚度小于约0.050英寸。 制造方法包括以下步骤：将硬质材料颗粒的单层固定到柔性模具的表面，用材料和粉末填充模具，以及CIP致密化以形成预制件。 然后在快速固态致密化粉末冶金工艺中将预成型件锻造成接近100％的密度。 所得到的钻头部件具有整体形成的覆盖层，具有优异的物理性能。

公开(公告)号：US5653299A

公开(公告)日：1997-08-05

申请号：US559959

申请日：1995-11-17

申请人： Harold A. Sreshta ,  Eric F. Drake

发明人： Harold A. Sreshta ,  Eric F. Drake

IPC分类号： B22F7/06 ,  C22C29/06 ,  C22C33/02 ,  E21B10/50

CPC分类号： C22C33/0292 ,  B22F7/06 ,  C22C29/067 ,  E21B10/50 ,  Y10T428/1209

摘要： A steel tooth rolling cutter earth boring drill bit comprises a bit body with a threaded upper end for attachment to the end of a drill string, and a lower end comprising three legs extending downwardly from the bit body and with a rolling cutter rotatably mounted on each leg. A layer of wear resistant material is applied to a portion of each rolling cutter and comprises were resistant particles in a substantially steel matrix. The steel matrix is integrally formed with the cutter in a rapid, solid state densification powder metallurgy (RSSDPM) process, and comprises a duplex microstructure comprising from about 10 to about 40 volume percent austenite and from about 60 to 90 volume precent martensite. The duplex microstructure may be achieved by incorporating a minor fraction of pure nickel and/or manganese powder in the powder mix used in the process, thereby providing nickel or manganese enrichment of the austenitic zones of the matrix.

摘要翻译： 钢齿滚动切割机钻孔钻头包括具有用于附接到钻柱的端部的螺纹上端的钻头体，以及包括从钻头体向下延伸的三个腿部的下端，并且可旋转地安装在每个 腿。 将一层耐磨材料施加到每个轧制切割机的一部分，并且包括基本上为钢基体的耐磨颗粒。 钢基体与快速固态致密粉末冶金（RSSDPM）工艺中的切割机一体地形成，并且包括由约10至约40体积％的奥氏体和约60至90体积的马氏体组成的双相微观结构。 可通过在工艺中使用的粉末混合物中加入少部分纯镍和/或锰粉末来实现双相组织，由此提供基体的奥氏体区域的镍或锰富集。