Inserts for earth-boring bits
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United States of America Patent
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Sep 18, 2001
Grant Date -
N/A
app pub date -
Dec 7, 1998
filing date -
Dec 7, 1998
priority date (Note) -
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Abstract
A polycrystalline diamond enhanced insert is disclosed. The insert includes a body portion adapted for attachment to an earth-boring bit and a top portion for contacting an earthen formation. The top portion of the insert is provided with two different compositions of polycrystalline diamond. In the primary surface of the top portion, a tougher or less wear-resistant polycrystalline diamond layer is provided, whereas a more wear-resistant polycrystalline diamond layer is provided in the remaining region of the top portion. In addition to polycrystalline diamond, polycrystalline boron nitride and other superhard materials also may be used.
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