Journal of Materials Science

, Volume 41, Issue 24, pp 8367–8371 | Cite as

Strength of functionally designed cellular cemented carbides produced by coextrusion

  • Sean E. Landwehr
  • Gregory E. Hilmas
  • Anthony Griffo


In an effort to improve the wear characteristics of petroleum drill bit inserts, a series of cemented carbide materials with a functionally designed cellular (FDC) architecture were fabricated by a coextrusion process. The FDC architecture characterized in this study was comprised of cemented carbide cells surrounded by a ductile cobalt cell boundary. Property evaluation employed transverse rupture strength (TRS) testing to characterize their mechanical behavior. It was determined that the presence of Co2 + x W4 − x C in the material greatly affected the bonding of the cell to the cell boundary and therefore the strength of the material. Fractography of the FDC materials supported the hypothesis that the interface between the cell and cell boundary was affected by the Co2 + x W4 − x C phase and the consequential reduction in cobalt content of the cell.


Cobalt Wear Resistance Cell Boundary Cell Material Cobalt Content 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



The authors would like to thank Brian White and Greg Lockwood of Smith Bits, and Jeff Rodelas of University of Missouri-Rolla for their hard work and input on testing, processing, and other characterization. We would like to thank Kennametal Engineered Products (Traverse City, MI) for performing the ROC processing. For his help in producing the cemented carbides powders in this study, and coordinating the ROC processing we would like to thank Jonathan Bitler of Kennametal AMSG (Rogers, AR).


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Copyright information

© Springer Science+Business Media, LLC 2006

Authors and Affiliations

  • Sean E. Landwehr
    • 1
  • Gregory E. Hilmas
    • 1
  • Anthony Griffo
    • 2
  1. 1.Materials Science and Engineering DepartmentUniversity of Missouri-RollaRollaUSA
  2. 2.Smith BitsHoustonUSA

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