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1.发明公开
公开(公告)号：EP0399679A2
公开(公告)日：1990-11-28
申请号：EP90304773.6
申请日：1990-05-02
CPC分类号： E21B10/56 , B23P5/00 , C22C26/00 , C23C30/005 , E21B10/52
摘要： Cemented tungsten carbide rock bit inserts (18) have diamond particle dispersed therein for enhanced hardness and war resistance. The cobalt matrix is primarily the face centered cubic crystal structure for enhanced ductility and toughness. Such inserts (18) are formed by introducing excess non-diamond carbon beyond the stoichiometric proportion in the tungsten carbide. The inserts (18) are pressed at a temperature and pressure where diamond is thermodynamically stable and cooled while maintaining the pressure sufficiently high to prevent decomposition of diamond crystals formed at the elevated temperature. Diamond crystals may be dispersed throughout the cemented tungsten carbon or may be more concentrated near the surface than in the interior.
摘要翻译： 水泥碳化钨钻头刀片（18）在其中分散有金刚石颗粒以提高硬度和抗扭性。 钴基体主要是面心立方晶体结构，用于增强延展性和韧性。 通过在碳化钨中引入超过化学计量比例的多余的非金刚石碳形成这种插入物（18）。 刀片（18）在金刚石热力学稳定和冷却的温度和压力下被压制，同时保持足够高的压力，以防止在升高的温度下形成的金刚石晶体的分解。 金刚石晶体可以分散在整个固结的钨碳中，或者在表面附近比在内部更集中。
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公开(公告)号：EP0399679A3
公开(公告)日：1991-01-30
申请号：EP90304773.6
申请日：1990-05-02
CPC分类号： E21B10/56 , B23P5/00 , C22C26/00 , C23C30/005 , E21B10/52
摘要： Cemented tungsten carbide rock bit inserts (18) have diamond particle dispersed therein for enhanced hardness and war resistance. The cobalt matrix is primarily the face centered cubic crystal structure for enhanced ductility and toughness. Such inserts (18) are formed by introducing excess non-diamond carbon beyond the stoichiometric proportion in the tungsten carbide. The inserts (18) are pressed at a temperature and pressure where diamond is thermodynamically stable and cooled while maintaining the pressure sufficiently high to prevent decomposition of diamond crystals formed at the elevated temperature. Diamond crystals may be dispersed throughout the cemented tungsten carbon or may be more concentrated near the surface than in the interior.
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公开(公告)号：EP0399679B1
公开(公告)日：1994-12-21
申请号：EP90304773.6
申请日：1990-05-02
CPC分类号： E21B10/56 , B23P5/00 , C22C26/00 , C23C30/005 , E21B10/52
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