Processing Issues for Cryomilled WC-Co Nanopowders

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

Research output: Contribution to journalArticle

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 Jan 1

Fingerprint

Powders
Processing
compacting
pressure reduction
Liquid nitrogen
schedules
liquid nitrogen
balls
sintering
Compaction
Sintering
Carbon
hardness
Hardness
Particle size
mechanical properties
Heating
Mechanical properties
Temperature
microstructure

All Science Journal Classification (ASJC) codes

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

Cite this

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
Lee, Gwan-Hyoung ; Park, Sangho ; Kang, Shinhoo ; Chung, Kyung Hyun ; Lavernia, Erique J. / Processing Issues for Cryomilled WC-Co Nanopowders. In: Materials Transactions. 2003 ; Vol. 44, No. 10. pp. 1935-1941.
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Lee, G-H, Park, S, Kang, S, Chung, KH & Lavernia, EJ 2003, 'Processing Issues for Cryomilled WC-Co Nanopowders', Materials Transactions, vol. 44, no. 10, pp. 1935-1941. https://doi.org/10.2320/matertrans.44.1935

Processing Issues for Cryomilled WC-Co Nanopowders. / Lee, Gwan-Hyoung; Park, Sangho; Kang, Shinhoo; Chung, Kyung Hyun; Lavernia, Erique J.

In: Materials Transactions, Vol. 44, No. 10, 01.01.2003, p. 1935-1941.

Research output: Contribution to journalArticle

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Lee G-H, Park S, Kang S, Chung KH, Lavernia EJ. Processing Issues for Cryomilled WC-Co Nanopowders. Materials Transactions. 2003 Jan 1;44(10):1935-1941. https://doi.org/10.2320/matertrans.44.1935