Effect of H-field or E-field on sintering and decrystallization of titanium oxides during 2.45 GHz microwave heating

Jun Fukushima, Sadatsugu Takayama, Saburo Sano, Motoyasu Sato, Yamato Hayashi, Hirotsugu Takizawa

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The effect of an H-field or E-field on the sintering and decrystallization of titanium oxides during 2.45 GHz microwave heating was investigated. Titanium oxides (TiO2-x) were heated in a TE103 single-mode cavity, which was used to separate the maximum point of the H-field or E-field of the 2.45 GHz microwave radiation. Scanning electron microscopy (SEM) images taken after H-field heating showed that the sample was sintered well above 1400 °C. In the X-ray diffraction (XRD) patterns, the intensity of the diffraction peaks of TiO2 decreased with increasing heating temperature between 1200°C and 1400 °C. After heating at 1500°C, however, the TiO2 peak intensities increased and undefined peaks emerged. Decrystallization is the dominant reaction, driven by the nonthermal microwave effect, below 1400°C. As the effect of the thermal energy becomes larger than the nonthermal microwave effect above 1500°C, grain growth becomes the dominant reaction. During E-field heating, the surface structure changes to fiber-like and dot-like structures, while some areas are oxidized by plasma excited by the microwaves.

Original languageEnglish
Pages (from-to)553-556
Number of pages4
JournalFuntai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
Volume59
Issue number9
DOIs
Publication statusPublished - 2012 Sep 1

Keywords

  • Decrystallization
  • Microwave H-field sintering
  • Sintering temperature
  • Sintering theory
  • Titanium oxides

ASJC Scopus subject areas

  • Mechanical Engineering
  • Industrial and Manufacturing Engineering
  • Metals and Alloys
  • Materials Chemistry

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