Neck growth kinetics during microwave sintering of nickel powder

D. Demirskyi, D. Agrawal, A. Ragulya

Research output: Contribution to journalArticle

47 Citations (Scopus)

Abstract

Model experiments on initial stage of microwave sintering of nickel powder showed anomalous neck-growth rate during isothermal soaking, which is not the case for conventional sintering. Neck growth was determined as a function of time. Values for the neck growth exponent in the neck growth equation, (x/a)n = Bt, of 5.2, 5.4, 5.8, and 5.9 were found for within the temperature range 700-950 °C, respectively. The evidences of formation of liquid phase during microwave sintering have been revealed, that may support enhancement of mass transfer during sintering process. The activation energy of 48 kJ mol-1 was found for microwave sintering of nickel, according to sphere-to-sphere model. Value revealed is significantly lower then values for conventional sintering (136 kJ mol-1), and is on same level with activation energy for diffusion of metals in liquid state. An explanation and analysis of this phenomenon has been attempted.

Original languageEnglish
Pages (from-to)1790-1795
Number of pages6
JournalJournal of Alloys and Compounds
Volume509
Issue number5
DOIs
Publication statusPublished - 2011 Feb 3
Externally publishedYes

Keywords

  • Diffusion
  • Metals
  • Microstructure
  • Microwave heating
  • Sintering

ASJC Scopus subject areas

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

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