Cutting elements for rotary drill bits
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United States of America Patent
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Jun 6, 1995
Grant Date -
N/A
app pub date -
Jul 1, 1994
filing date -
Jul 7, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A cutting element for a rotary drill bit comprises a thin cutting table of polycrystalline diamond having a front cutting face and a rear surface bonded to a tungsten carbide substrate. The substrate incorporates one or more thin barrier layers which extend at least partly through the thickness of the substrate in a direction transverse to its front surface. Each barrier layer is formed of a material, such as nickel, which is more ductile than the material of the substrate, but is metallurgically compatible with it.
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