Sintering of tungsten powder with and without tungsten carbide additive by field assisted sintering technology

S. Chanthapan, Anil Kamalakant Kulkarni, Jogender Singh, C. Haines, D. Kapoor

Research output: Contribution to journalArticle

23 Scopus citations

Abstract

Tungsten powder (0.6-0.9 μm) was sintered by field assisted sintering technology (FAST) at various processing conditions. The sample sintered with in-situ hydrogen reduction pretreatment and pulsed electric current during heating showed the lowest amount of oxygen. The maximum relative density achieved was 98.5%, which is from the sample sintered at 2000 °C, 85 MPa for 30 min. However, the corresponding sintered grain size was 22.2 μm. To minimize grain growth, nano tungsten carbide powder (0.1-0.2 μm) was used as sintering additive. By mixing 5 and 10 vol.% WC with W powder, densification was enhanced and finer grain size was obtained. Relative density above 99% with grain size around 3 μm was achieved in W-10 vol.% WC sintered at 1700 °C, 85 MPa, for 5 min.

Original languageEnglish (US)
Pages (from-to)114-120
Number of pages7
JournalInternational Journal of Refractory Metals and Hard Materials
Volume31
DOIs
StatePublished - Mar 1 2012

All Science Journal Classification (ASJC) codes

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

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