Sn-Zn合金相变储热材料的热循环稳定性

以低熔点合金Sn和Zn为原料,制备了Sn-Zn合金,采用XRD,DSC和激光热常数测试仪对产物结构和热物理性能进行了表征。结果表明,Sn-9Zn合金相变温度为198.1℃,相变潜热为65.8J/g,热导率为53.4W/(m.K)。随着热循环次数的增加,合金相变温度略有升高,相变潜热和热导率逐渐降低。经500次热循环后,Sn-9Zn合金的相变温度、相变潜热和热导率变化均在5%以内。

Thermal Cycling Stability of Sn-Zn Phase Change Heat Storage Alloy

Sn-Zn alloy with low melt point was prepared by casting technology.The structure and heat storage properties were investigated by optical microscope(OM),XRD(X-ray diffraction),DSC and laser thermal constants measuring apparatus.The results show that the latent heat of the alloy and phase-change temperature,thermal conductivity are 198.1 ℃,65.8 J/g and 53.4 W/(m·K),respectively.The phase change temperature is increased slightly and latent heat and thermal conductivity are decreased gradually with the increase of thermal cycling.The change rate of phase change temperature,thermal conductivity and latent heat of the alloy is below 5% after 500 heat cycles。