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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.44  No.10 (2003)  >  pp.1935-1941

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Processing Issues for Cryomilled WC-Co Nanopowders

Gwan-Hyoung Lee1), Sangho Park1), Shinhoo Kang1), Kyung-Hyun Chung2) and Erique J. Lavernia2)
1) School of Materials Science and Engineering, Seoul National University
2) Department of Chemical and Biochemical Engineering and Materials Science, University of California

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.

Published online: September 06, 2005
Copyright (c) 2005 The Japan Institute of Metals



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