Difference in carbo-thermal reduction reaction kinetics of NiO in microwave E- and H-fields

Noboru Yoshikawa, Etsuko Ishizuka, Ken ichi Mashiko, Shoji Taniguchi

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)

Abstract

A powder mixture of NiO and graphite was heated in a single mode-microwave (MW) applicator at 2.45 GHz for carbo-thermal reduction of NiO. The specimen was placed in the wave guide at maximum positions of either electric (E) field or magnetic (H) field and kept at a constant temperature. A tendency was observed that the reduction rate at 600 °C was larger in the H-field than in the E-field. Considering the fact that NiO can be heated only in the E-field, while graphite can be heated in both fields, graphite particles in the powder mixture might be selectively heated in the H-field. Hence, it is postulated that a microscopic temperature gradient is formed more in the H-field, which caused the gas convection, then the mass transfer and the gas-solid reaction is enhanced, so the enhanced reduction kinetics resulted, eventually.

Original languageEnglish
Pages (from-to)2096-2099
Number of pages4
JournalMaterials Letters
Volume61
Issue number10
DOIs
Publication statusPublished - 2007 Apr 1

Keywords

  • Carbo-thermal reduction
  • Electric field
  • Kinetics
  • Magnetic field
  • Microwave
  • Nickel oxide

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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