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

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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.

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Correspondence to Noboru Yoshikawa.

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Yoshikawa, N., Wang, H., Mashiko, Ki. et al. Microwave heating of soda-lime glass by addition of iron powder. Journal of Materials Research 23, 1564–1569 (2008). https://doi.org/10.1557/JMR.2008.0190

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  • DOI: https://doi.org/10.1557/JMR.2008.0190

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