Microwave heating behavior in SiC Fiber-MO2 mixtures (M = Ce, Zr)-selective heating of micrometer-sized fibers facilitated by ZrO2 Powder

Keiichiro Kashimura, Jun Fukushima, Tomoaki Namioka, Takashi Fujii, Hirotsugu Takizawa, Hideoki Fukushima

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

SiC fiber-MO2 (M= Ce, Zr) mixtures with various compositions were heated by applying an 80 W microwave electric field, to investigate their heating rate, maximum temperature, and dielectric constant. For the SiC fiber-CeO2 mixture, all three parameters continued to increase as the weight ratio of the SiC fiber increased; in contrast, for the SiC fiber-ZrO2 mixture, these parameters reached a maximum value at a certain composition. A thermal gradient of 500 °C was observed at a microlevel in the SiC fiber-ZrO2 mixture, and hot spots were located in regions with a certain composition. This result not only contributes to designing a novel good microwave absorber but also presents new aspects with regard to high-temperature microwave processing, including the mechanism behind the high-temperature gradients on the order of micrometers as well as engineering applications that utilize these high-temperature gradients.

Original languageEnglish
Article number47
JournalProcesses
Volume8
Issue number1
DOIs
Publication statusPublished - 2020 Jan 1

Keywords

  • Anomalous heating behavior
  • Microwave heating
  • Selective heating
  • Silicon carbide fibers
  • ZrO

ASJC Scopus subject areas

  • Bioengineering
  • Chemical Engineering (miscellaneous)
  • Process Chemistry and Technology

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