Effect of Milling on the Carbothermal Reduction of Oxide Mixture for (Ti,W)C-Ni

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  • Kwon Hanjung
    Department of Materials Science and Engineering, Seoul National University
  • Kang Shinhoo
    Department of Materials Science and Engineering, Seoul National University

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Abstract

The effect of high-energy milling on the phase transformation and carbothermal reduction was examined using an oxide mixture, TiO2-WO3-NiO-C, with a process to synthesize (Ti,W)C cermets. Due to the high energy involved in the mill raw, anatase TiO2 transformed first to TiO2-II and then to rutile, while WO3 transformed to a high-pressure WO3-HP and hexagonal WO3 phase. The co-existence of WO3 and TiO2 enhanced the formation of a nano-crystalline or amorphous phase. The (Ti,W)C phase was formed mainly at 1150°C from TiC and WC formed in the early stages. These results were further examined using XRD, the Rietveld method and mass spectroscopy.

Journal

  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 49 (7), 1594-1599, 2008

    The Japan Institute of Metals and Materials

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