Stress-reduced superhard cutting element
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United States of America Patent
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Feb 20, 1996
Grant Date -
N/A
app pub date -
Jun 17, 1994
filing date -
Jun 17, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A cutting element suitable for incorporation in a drill bit used for earth drilling is disclosed which comprises an abrasive layer of superhard material formed on a substrate support, the substrate and/or the abrasive layer being structurally modified to reduce and/or redistribute detrimental tensile stresses which occur at the periphery of the abrasive layer and at or near the interface between the abrasive layer and the substrate, and within the body of the substrate. The modified cutting element structure reduces the occurrence of fracturing and cutter degradation.
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