Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Making composite or hollow article
Reexamination Certificate
2005-03-29
2005-03-29
Jenkins, Daniel (Department: 1742)
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Making composite or hollow article
C419S006000, C419S011000, C419S014000
Reexamination Certificate
active
06872356
ABSTRACT:
The residual stresses that are experienced in polycrystalline diamond cutters, which lead to cutter failure, can be effectively modified by selectively thinning the carbide substrate subsequent to high temperature, high pressure (sinter) processing, by selectively varying the material constituents of the carbide substrate, by subjecting the PDC cutter to an annealing process during sintering, by subjecting the formed PDC cutter to a post-process stress relief anneal, or a combination of those means.
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Butcher Trent N.
Horton Ralph M.
Jurewicz Stephen R.
Scott Danny E.
Smith Redd H.
Baker Hughes Incorporated
Jenkins Daniel
TraskBritt
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