Boring or penetrating the earth – Bit or bit element – Impact or percussion type
Patent
1991-06-14
1993-06-08
Neuder, William P.
Boring or penetrating the earth
Bit or bit element
Impact or percussion type
175433, E21B 1046
Patent
active
052170810
ABSTRACT:
The present invention relates to a rock bit insert of cemented carbide for cutting rock drilling. The insert is provided with one or more bodies or layers of diamond or cBN produced at high pressure and high temperature in the diamond or cBN stable area.
The body of cemented carbide has a multi-structure containing eta-phase surrounded by a surface zone of cemented carbide free of eta-phase and having a low content of cobalt in the surface and a higher content of cobalt next to the eta-phase zone.
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Dennis Mahlon D.
Fischer Udo K. R.
Hillert Lars H.
Waldenstrom Mats G.
Diamant Boart Stratabit S.A.
Neuder William P.
Sandvik AB
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