摘要
对 Si 含量为10%~13%的 Al-Si 合金进行了加速氧化、热循环和掺 Fe 实验,研究了其在不同热循环条件下的相变储热性能和可靠性.结果表明,在空气中经几百 h 的高温氧化后,氧化率小于0.01%,其影响可以忽略不计.经过0,4,23,60, 100,200,300,400,500,600,700次熔化-凝固循环后,相变温度的变化为3.8~11.8℃,相变潜热从484.86 kJ/kg下降到432.62 kJ/kg.当 Al-Si 合金的掺铁量为0.5%时,相变潜热下降6.5%;对于缓冷的储能过程,偏析较小并在循环多次后趋于缓和和稳定.Al-Si 合金成份和结构的变化对材料的储热性能影响较小,在长期的热循环过程中有良好和稳定的储热性能.
The accelerated oxidation and thermal cycle and addition of Fe for Al-Si alloy (10%-13% Si) were performed. The results showed that the'effects of oxidation on the composition of the alloy could be neglectful, and the change of phase change temperature was in the range of 3.8-11.8 ℃, and the latent heat changed decreasingly from 484.86 kJ/kg to 432.62 kJ/kg after 700 melt-freeze cycles. Fe added (0.5%) resulted in decrease of the latent heat 6.5%. Al-Si eutectic alloy as phase change storage materials (PCMs) has a good reliability of thermal cycling in the long term.
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
2006年第2期156-160,共5页
Chinese Journal of Materials Research
基金
国家自然科学基金59876010资助项目~~
关键词
金属材料
铝硅合金
相变材料(PCMs)
潜热
metallic materials, Al-Si alloy, phase change materials(PCMs), latent heat