Cutting elements formed from ultra hard materials having an...

Details Cutting elements formed from ultra hard materials having an... Cutting elements formed from ultra hard materials having an...

E - Fixed Constructions

21

B

E21B 10/46 (2006.01) E21B 10/50 (2006.01)

Patent

CA 2533356

Cutting elements of this invention include an ultra hard body joined with a metallic substrate. The body includes an uppermost layer comprising a plurality of bonded ultra hard crystals and interstitial regions, and that defines a body working surface. The uppermost layer includes an outer region that is relatively more thermally stable than a remaining portion of the uppermost layer. The body further includes an intermediate layer joined to the uppermost layer, comprising a plurality of bonded ultra hard crystals, and having a wear resistance less than that of the uppermost layer remaining region. The body may additionally include a lowermost PCD layer that is interposed between and attached to the intermediate layer and the substrate.

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