Processing Issues for Cryomilled WC-Co Nanopowders

Gwan Hyoung Lee, Sangho Park, Shinhoo Kang, Kyung Hyun Chung, Erique J. Lavernia

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11 Citations (Scopus)

Abstract

Processing issues of cryomilled WC-VC-Co nanopowders were investigated. A powder mixture of WC-9.8Co-0.8VC-xC was milled at -50°C in liquid nitrogen, using WC-Co balls. The particle sizes of the powders, in the form of agglomerates, were reduced to 18 nm and 13 nm for WC and Co, respectively by this process. The roles of some of the processing parameters such as compacting pressure, reduction of powders, and temperatures for the heating schedule were evaluated at a sintering temperature of 1450°C. The use of CIP resulted in a more uniform microstructure and enhanced mechanical properties: hardness (13-14 GPa) and KIC (12-15 MPam1/2). The findings herein suggest that carbon control and the use of a proper compaction technique were key factors in the successful production of nano-sized WC-Co alloys with no detectable η phase.

Original languageEnglish
Pages (from-to)1935-1941
Number of pages7
JournalMaterials Transactions
Volume44
Issue number10
DOIs
Publication statusPublished - 2003 Oct

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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    Lee, G. H., Park, S., Kang, S., Chung, K. H., & Lavernia, E. J. (2003). Processing Issues for Cryomilled WC-Co Nanopowders. Materials Transactions, 44(10), 1935-1941. https://doi.org/10.2320/matertrans.44.1935