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  • 1 Department of Electronics and Informatics, North Shore College of SONY Institute, Atsugi, 243 Kanagawa
  • 2 School of Education, Waseda University, 1-6-1 Nishiwaseda, 169-50 Shinjuku, Japan
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Abstract

A DSC method for evaluating the surface area of etched Al foils for use in high performance electrolytic capacitors is presented. A linear relationship between the etching degree (effective surface area) and the thermal resistance of the sample is obtained by means of DSC, based on the transient phenomenon. This method using the transient state in DSC measurement is not only novel, but also rapid and simple in evaluating the surface area of an etched aluminum foil. The method is effective even when the Al foil has a naturally oxidized surface.

  • 1 Ozao, R., Ogura, H. and Ochiai, M., in press.

  • 2 Stull, D. R. et al., JANAF Thermochemical Tables, 1979.

  • 3 Ditmars, D. A. Plint, C. A. Shukla, R. C. 1985 Int. J. Thermophys. 6 499499. .

  • 4 Ozao, R., Ogura, H. and Ochiai, M., Proc. Ceramic Soc. Japan, Fall Symposium, 4-1 C24 1995, in Japanese.

  • 5 Oka, S. et al. 1967 JJAP 6 469469.

  • 6 Crank, J., The Mathematics of Diffusion, Clarendon Press, 1955; G. M. Dusinberre, Heat Transfer Calculations by Finite Differences, International Text Book, 1961 (as cited in: I. Onaka, Introduction to Heat Transfer and Solidification Analysis, Maruzen, Tokyo 1986, in Japanese).

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