Thermally-stable polycrystalline diamond element and...

Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element

Reexamination Certificate

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C175S434000

Reexamination Certificate

active

08074748

ABSTRACT:
Embodiments of the invention relate to thermally-stable polycrystalline diamond (“PCD”) elements, polycrystalline diamond compacts (“PDCs”), and methods of fabricating such PCD elements and PDCs. In an embodiment, a PCD element includes a PCD body comprising bonded diamond grains defining a plurality of interstitial regions. The PCD body includes a first volume having a first portion of the interstitial regions and a second volume having a second portion of the interstitial regions. The PCD body further includes an infiltrant that is disposed in the first portion of the interstitial regions and the second portion of the interstitial regions is substantially free of the infiltrant. The infiltrant comprises a glass, a glass-ceramic, silicone, a thermal decomposition reaction product of silicone, a ceramic having a negative coefficient of thermal expansion, or combinations thereof.

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