Takamitsu Honjo1,, Hiromasa Yabe1, Shingo Tsubuteishi1, Haru-Hisa Uchida1,2 and Yoshitake Nishi1
1Graduate School of Materials Science, TOKAI University, Hiratsuka 259-1292
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)
hydrogen storage alloy, actuator, film, LaNi5, compositional dependence, strain, hydrogen storage capacity
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