Tools for cutting rock drilling
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United States of America Patent
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-
Jun 8, 1993
Grant Date -
N/A
app pub date -
Jun 14, 1991
filing date -
Jun 15, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
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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