Tools for percussive and rotary crushing rock drilling provided with a diamond layer
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United States of America Patent
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Aug 9, 1994
Grant Date -
N/A
app pub date -
Jun 14, 1991
filing date -
Jun 15, 1990
priority date (Note) -
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Abstract
The present invention relates to a rock bit button of cemented carbide for percussive or rotary crushing rock drilling. The button is provided with a layer of diamond produced at high pressure and high temperature in the diamond stable area. The cemented carbide has a multi-phase structure having a core that contains eta-phase surrounded by a surface zone of cemented carbide free of eta-phase.
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