Sintering of nano-sized WC-Co powders produced by a gas reduction-carburization process

Gwan Hyoung Lee, Shinhoo Kang

Research output: Contribution to journalArticle

71 Citations (Scopus)

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 η 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.

Original languageEnglish
Pages (from-to)281-289
Number of pages9
JournalJournal of Alloys and Compounds
Volume419
Issue number1-2
DOIs
Publication statusPublished - 2006 Aug 10

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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