An Improved H2-Gas Pressure Operated LaNi5 Powder-Dispersed Polyurethane/Titanium 2-Layer Actuator with Reversible Giant and Rapid Expansion by Hydrogenation - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Materials Transactions Année : 2018

An Improved H2-Gas Pressure Operated LaNi5 Powder-Dispersed Polyurethane/Titanium 2-Layer Actuator with Reversible Giant and Rapid Expansion by Hydrogenation

Résumé

A unimorph 2-layer (PU:LaNi5/Ti) actuator consisting of a driving composite sheet with large expansion of polyurethane (PU) dispersed with powder mixture of hydrogen storage alloy of 35 vol%-LaNi5 and Pd-Al2O3 catalyst prepared by solution cast method, and a 5 μm thick Ti sheet exhibited reversible and giant rapid bending motion when subjected to hydrogen atmosphere. Reversible motion was achieved below 0.20 MPa-H2 pressure where maximum strain (εmax) values on vertical and horizontal directions were more than 2400 and 1800 ppm, respectively about 1.6 times larger than that reported (1520 and 1120 ppm) for the same actuator PU:LaNi5/Cu with 10 μm thick copper (Cu) sheet. Moreover, the maximum responsiveness (dε/dt)max by hydrogenation of cyclic motion of the PU:LaNi5/Ti was higher than that of the PU:LaNi5/Cu. The increased (dε/dt)max values mostly corresponded to decreasing elastic load resistivity (dF/dε). These were due to Ti having higher stiffness and strength than Cu allowing thinner 5 μm sheet. Caution for safety is advised since values presented herein may be different when applying the actuator to zero gravity environments.

Dates et versions

hal-02051439 , version 1 (27-02-2019)

Identifiants

Citer

Yoshitake Nishi, Junya Ohkawa, Michael Faudree, Masae Kanda, Kaori Yuse, et al.. An Improved H2-Gas Pressure Operated LaNi5 Powder-Dispersed Polyurethane/Titanium 2-Layer Actuator with Reversible Giant and Rapid Expansion by Hydrogenation. Materials Transactions, 2018, 59 (1), pp.129-135. ⟨10.2320/matertrans.M2017212⟩. ⟨hal-02051439⟩
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