Microwave sintering: A new approach to fine-grain tungsten - II

Mohit Jain, Ganesh Skandan, Krista Martin, Deepak Kapoor, Kyu Cho, Bradley Klotz, Robert Dowding, Dinesh Agrawal, Jiping Cheng

Research output: Contribution to journalArticlepeer-review

22 Scopus citations

Abstract

While grain-growth inhibition in micrograined refractory metals and ceramics is well documented, a reduction in grain size to the nanoscale is relatively new. In the work reported here, nanocrystalline tungsten powders containing small amounts of HfO2 and Y2O3 as dopants were synthesized using a solution-synthesis technique. The assynthesized powders were then consolidated using microwave sintering. The effect of dopant concentration on the crystallite size, particle size, and grain size of the sintered material was monitored. Average grain sizes as low as 0.5 μm were achieved in doped microwave-sintered tungsten; this grain size is substantially smaller than previously reported, namely ∼2 μm in undoped tungsten. It was also observed that an optimum level of dopant exists for effective grain-growth inhibition, since the sintering of tungsten is hindered at higher dopant levels.

Original languageEnglish (US)
Pages (from-to)53-57
Number of pages5
JournalInternational Journal of Powder Metallurgy (Princeton, New Jersey)
Volume42
Issue number2
StatePublished - Mar 1 2006

All Science Journal Classification (ASJC) codes

  • Metals and Alloys
  • Industrial and Manufacturing Engineering

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