Materials Transactions Online

Materials Transactions, Vol.48 No.05 (2007) pp.1105-1112
© 2007 The Japan Institute of Metals

Electrical and Thermal Characteristics of Pb-Free Sn-Zn Alloys for an AC-Low Voltage Fuse Element

Kazuhiro Matsugi1, Gen Sasaki1, Osamu Yanagisawa1, Yasuo Kumagai2 and Koji Fujii2

1Department of Mechanical Materials Engineering, Hiroshima University, Higashi-Hiroshima 739-8527, Japan
2The Chugoku Electric Power Co. Inc., Hiroshima 730-8701, Japan

The temperature dependence of specific resistivity and thermal conductivity for some Sn-Zn alloys was measured to use their values in electrical and thermal calculations on the basis of Ohm's and Fourier's laws, in order to obtain the temperature-distribution in lead-free fuse elements of electric power line. The interaction between microstructures and their properties was also investigated in Sn-Zn alloys. Specific resistivity and thermal conductivity could be estimated as a function of temperature and alloy composition in the compositional ranges classified from the standpoint of continuity or non-continuity of constituent phases such as primary Zn, Sn-solid solution and eutectic in microstructures of Sn-1 to 100Zn alloys. In the proposed estimations, not only volume fraction of Zn and Sn-solid solution phases but morphologies of both phases were considered in Sn-Zn alloys.

(Received 2007/1/23; Accepted 2007/3/1; Published 2007/4/25)

Keywords: specific resistivity, thermal conductivity, lead-free tin-zinc alloys, fuse element, environmentally friendly materials, two phase materials, substitute materials

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