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Abstract
A commercial Zr–V–Fe alloy (i.e. SAES Getters trade name alloy St-172) has been assessed as reversible hydrogen storage material for use in actuators of gas-gap heat switches. For applications involving hydride compressors in closed-cycle Joule–Thomson sorption cryocoolers, the actuator need to produce a conducting (i.e. ON) state pressure above 670 Pa and an insulating (i.e. OFF) state pressure below 0.13 Pa in the gas-gap switch with switching times ∼200 s between the two states. Pressure–composition–temperature isotherms have been measured for the SAES St-172 material to define power efficient baseline performance at appropriate hydrogen concentration for these heat switch actuators. Two prototype actuators containing the SAES St-172 material were built and operated for several thousand cycles to evaluate performance of the metal hydride system under conditions simulating heat switch operation.
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