POLYCRYSTALLINE DIAMOND
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United States of America Patent
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Issued Date -
Feb 16, 2012
app pub date -
Mar 1, 2010
filing date -
Feb 27, 2009
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The invention relates to a polycrystalline diamond (PCD) body comprising PCD material having a graphitisation onset temperature, the PCD body having a working surface and comprising a first region remote from the working surface, the first region containing a catalysing material; and a second region extending a depth from the working surface into the PCD body, the second region being substantially free of catalysing material; the depth having a thermal gradient characteristic that when the temperature at the working surface is 900 degrees centigrade, the temperature at the depth is in the range from 780 degrees centigrade to 850 degrees centigrade and to inserts, machine tools and drill bits comprising the PCD body.
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