Elements faced with superhard material
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United States of America Patent
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-
Feb 4, 1997
Grant Date -
N/A
app pub date -
Nov 9, 1994
filing date -
Nov 10, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A preform element, such as a cutting element for a drag-type drill bit, includes a facing table of superhard material having a front cutting face, a peripheral surface, and a rear surface bonded to a substrate which is less hard than the superhard material. The rear surface of the facing table is integrally formed with a plurality of protuberances, such as ribs or studs, which project into the substrate. The depth to which the protuberances project into the substrate varies in irregular manner across the facing table, so as to inhibit the propagation of cracks across the substrate to the rear of the facing table.
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