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Sintering of nano-sized WC-Co powders produced by a gas reduction-carburization process
Cited 72 time in
Web of Science
Cited 83 time in Scopus
- Authors
- Issue Date
- 2006-08
- Publisher
- Elsevier BV
- Citation
- Journal of Alloys and Compounds, Vol.419 No.1-2, pp.281-289
- Abstract
- Nanocrystalline cemented tungsten carbide has attracted considerable interests for use in cutting tool,because of its superior mechanical properties. In this study, nano-sized powders of mixed WC and Co were prepared from attrition-milled oxides by a gas reduction-carburization process. The effects of compacting pressure, heating schedule, additional ball-milling, and the presence of a grain growth inhibitor on the sintering properties of the nano-sized WC-Co powders were examined. The grain size and phases in WC-Co alloy were clearly affected by compacting pressure. Because of the trapped gases and the lower melting point of the cobalt binder, when a compact of nano-sized WC-Co powder was sintered through a heating schedule with holding steps, the sintered alloy maintained the small size of WC grains without any eta phase. In addition, the additional ball-milling improved the microstructure and mechanical properties of the nano-sized WC-Co powder by producing a more uniform distribution of carbon. The addition of VC led to uniformity in microstructure and mechanical properties, even though significant carbon loss occurred. (c) 2005 Elsevier B.V. All rights reserved.
- ISSN
- 0925-8388
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