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Microwave heating of soda-lime glass by addition of iron powder

Published online by Cambridge University Press:  31 January 2011

Noboru Yoshikawa ,
Haichuan Wang ,
Ken-ichi Mashiko  and
Shoji Taniguchi
Noboru Yoshikawa*
Affiliation:
Graduate School of Environmental Studies, Tohoku University, Sendai, Japan 980-8579
Haichuan Wang
Affiliation:
Department of Metallurgy, Anhui University of Technology, Ma-Anshan, Anhui, People’s Republic of China
Ken-ichi Mashiko
Affiliation:
Tohoku University, Sendai, Japan 980-8579; and Graduate School of Environmental Studies, Tohoku University, Sendai, Japan 980-8579
Shoji Taniguchi
Affiliation:
Graduate School of Environmental Studies, Tohoku University, Sendai, Japan 980-8579
*
a)Address all correspondence to this author. e-mail: yoshin@material.tohoku.ac.jp
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Abstract

Experimental studies were conducted to investigate the microwave (MW) heating behavior of soda-lime glass beads with added iron powder. These studies were intended to obtain fundamental knowledge for vitrification solidification and for the fabrication of metal-reinforced glass-matrix composites. The glass beads (0.2 mm diameter) did not heat very well by themselves at temperatures greater than 200 °C within 600 s in a multimode applicator at a power of 0.67 W. The addition of iron powder (average 70 μm, volume fraction 18%) made it possible to heat the glass beads above 700 °C within 60 s. At lower fractions of 3–11 vol%, however, a sudden temperature rise [thermal runaway (TRW)] occurred after the incubation time period. A single-mode MW applicator was used for clarifying the electric (E)-field and magnetic (H)-field contributions to the heating of each material and their mixtures. The results of this study demonstrated that the H-field contributed to the heating of the iron and then triggered the heating of the glass. The E-field component is necessary for heating the glass to a temperature higher than 800 °C. The factors determining the threshold values of the volume fraction causing TRW are discussed.

Keywords

FeMicrowave heatingMixture
Type
Articles
Information
Journal of Materials Research , Volume 23 , Issue 6 , June 2008 , pp. 1564 - 1569
Copyright
Copyright © Materials Research Society 2008

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References

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