日本金属学会誌

J. Japan Inst. Metals, Vol. 67, No. 4 (2003),
pp. 145-148

Chemical Composition Dependence of the Properties of a LaNix(x=3.8 to 6.5) Hydrogen Storage Alloy Film Actuator

Takamitsu Honjo1,, Hiromasa Yabe1, Shingo Tsubuteishi1, Haru-Hisa Uchida1,2 and Yoshitake Nishi1

1Graduate School of Materials Science, TOKAI University, Hiratsuka 259-1292
2Department of Human Development, School of Humanities and Culture, TOKAI University, Hiratsuka 259-1292

Abstract:

Hydrogen storage alloy, accompanied by a volume expansion of more than 24% by hydrogenation, exhibits enormous high levels of expanding force. An actuator using this phenomena functioning by hydrogen pressure change may exhibit both drastically large fore and shape changes. Hydrogen storage alloy is, however, pulverized by the hydrogenation, therefore, thin film in about 1 μm thick of a hydrogen alloy was used as actuator material, which was not pulverized by the hydrogenation. Compositional dependence of LaNix(x=3.8 to 6.5) on the actuation behavior was investigated in this study. The largest displacement was observed for the test device with the composition of LaNi5, which indicated the largest storage capacity for the hydrogen.


(Received December 2, 2002)

Keywords:

hydrogen storage alloy, actuator, film, LaNi5, compositional dependence, strain, hydrogen storage capacity


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