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The Effect of Particle Size on Microwave Heated Carbon and the Subsequent Crystallite Growth

  • Claude P. Lorenson (a1), Mark C.L. Patterson (a1), Gail Risto (a1) and Robert Kimber (a1)

Abstract

The dielectric properties of carbon imply that heating with microwave energy should not be significant at elevated temperatures. It has been demonstrated, however, that temperatures in excess of 1900°C can be achieved with low powers. The effect of particle size on the heating rate will be presented and a heat absorption mechanism is postulated to explain the high temperatures observed.

Under controlled conditions, conventional and microwave heating has been used to observe growth of the carbon crystallite size up to a temperature of 1400°C. Under these conditions, no enhanced crystal growth was observed for microwave heating.

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1.Internal communication.
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3. Buideve, E.C., Cain, F.L., Seal, J., “Measurement of Radio Frequency Permittivity of Biological Tissues with an Open Ended Coaxial Line: Part 1”, IEEE Trans., Microwave Theory Tech., MTT–30, 82, 1980.
4. Patterson, M.C.L., Apte, P.S., Kimber, R.M., and Roy, R., Enersearch Report #600049, “Microwave Heating for Ceramic Joining”.
5. Klug, H.P., Alexandre, L.E., “X-Ray Diffraction Procedures for Polycrystalline and Amorphous Materials”, John Wiley & Sons, 2nd Ed., pp. 700704, 1975.
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7. Nelson, S., Kraszewoki, A., You, T., “Solid and Particulate Material Permittivity Relationships”, Journal of Microwave Power and Electromagnetic Energy, Vol. 26, #1, p. 45, 1991.

The Effect of Particle Size on Microwave Heated Carbon and the Subsequent Crystallite Growth

  • Claude P. Lorenson (a1), Mark C.L. Patterson (a1), Gail Risto (a1) and Robert Kimber (a1)

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