<報文>ニチノール熱エンジンの性能に関する研究

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In order to reveal the performance of the vertical type heat engine previously reported, the effect of temperature of hot water on rotation speed, torque and generating power, has been investigated. The effect of substitution of a small amount of Cu for Ni of TiNi was investigated for the purpose of reducing temperature difference for working range of this heat engine. The variations of martensite structures of TiNi in cooling or during deformation were continuously observed by transmission electron microscope. The following observation could be made from the present experiments : (1) The rotation of this engine started at 48℃ and the rotation speed increased with the increase of temperature. High speed rotation of 730rpm was obtained at 90℃.(2) The torque and rotation speed were measured as a function of temperature of hot water. The torque of 95g-cm was obtained at 320rpm in 90℃ hot water.(3) The generating power of 0.4W was obtained at 450rpm in 90℃ hot water. This power corresponds to 0.7W per 1g of TiNi.(4) The relations between the difference of circumference of two pulleys and the performance of heat engine were examined. The maximum power was obtained in the case of the difference of circumference of 20πmm.(5) The temperature difference for working range of this engine decreased down to 20℃ by the substitution of 10at%Cu for Ni of TiNi. The tensile strength at lower temperature also decreased down to about 50MPa. Thus the Cu substitution appears to effectively improve the performance of this heat engine.(6) Various conditions for shape memory treatment of as-drawn wire were examined. The treatment at 500℃ for 4 hours shows the best condition for the shape memory effect.(7) Variation of martensite structure in cooling or during deformation and the mechanism of deformation in TiNi were discussed from the results by transmission electron microscope.
東北大学の論文
1982-03-25

<報文>ニチノール熱エンジンの性能に関する研究

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