发明名称 |
A polycrystalline diamond body whose surface is free of group VIII metals |
摘要 |
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. |
申请公布号 |
GB2464865(A) |
申请公布日期 |
2010.05.05 |
申请号 |
GB20100001698 |
申请日期 |
2005.09.21 |
申请人 |
SMITH INTERNATIONAL INC |
发明人 |
RONALD K EYRE;THOMAS W OLDHAM;ANTHONY GRIFFO |
分类号 |
E21B10/46;B22F7/00;B22F7/06;C22C26/00;E21B10/567 |
主分类号 |
E21B10/46 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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