水素吸蔵合金を用いたソフトアクチュエータ用 Zr_xTi_1−xMn_0.8V_0.2Ni_0.9M_0.1 (M=Ni, Al, Fe, Cu)合金の開発

抄録

  The effect of substitution elements on hysteresis and flatness of the equilibrium pressure plateau in Zr_xTi_1−xMn_0.8V_0.2Ni_1.0 was investigated. For a metal hydride (MH) actuator in rehabilitation devices, the suitable hydrogen storage alloys were developed. The equilibrium pressure decreased with increasing Zr/Ti ratio. By Al substitution, the hysteresis factor became smaller, while Fe and Cu substitution did not change the hydrogenation properties. It was confirmed that ferrovanadium is available in these alloys to reduce not only the material cost but also the hysteresis factor leading to better properties for the MH actuator. The developed Zr_0.5Ti_0.5Mn_0.8V_0.2Ni_0.9Al_0.1 showed no significant reduction of hydrogen capacity and no significant change in the shape of the pressure-composition (P-C) isotherms even after 1000 cycles.