Conversion of W2C to WC phase during mechano-chemical synthesis of nano-size WC-Al2O3 powder using WO3-2Al-(1 + x)C mixtures

M. Sakaki, M. Sh Bafghi, J. Vahdati Khaki, Q. Zhang, F. Saito

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22 Citations (Scopus)

Abstract

Due to the weak properties of W2C phase, its formation during the process of WC synthesis should be prevented. The aim of the present study has been the mechano-chemical synthesis of a WC-Al2O3 composite powder free from undesirable W2C phase through the addition of excess carbon to the WO3-2Al-C initial mixture. Based on the thermodynamic calculations and results of the supplementary experiments in W-yC and W2C-C systems, the possibility of the conversion of W 2C to WC phase through the addition of excess carbon has been investigated. It has been shown that production of a WC-Al2O 3 composite powder by 360 min mechano-chemical treatment of an initial mixture of WO3-2Al-1.8C is possible. TEM observations and Williamson-Hall calculation revealed that the obtained WC-Al2O 3 powder contains macro-size agglomerates in which each agglomerate consists of nano-size phases.

Original languageEnglish
Pages (from-to)116-121
Number of pages6
JournalInternational Journal of Refractory Metals and Hard Materials
Volume36
DOIs
Publication statusPublished - 2013 Jan 1

Keywords

  • Mechano-chemical processing
  • Nano materials
  • Tungsten carbide

ASJC Scopus subject areas

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

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