摘要
以含Si量为12%的铝硅合金为相变材料、高岭土为基体复合制备相变蓄热材料,通过热分析(DSC-TG)、热循环、扫描电子显微镜(SEM)和导热分析(LFA),研究相变材料Al-Si合金的含量与复合相变材料的相变潜热及热稳定性之间关系。结果表明,在空气中,当Al-Si合金含量分别为50%、33%、25%、20%和17%时,经过5次、10次、15次、20次热循环后,复合相变材料的相变潜热逐渐减小,在15次热循环后相变潜热趋于稳定。此外,复合相变材料的微观形貌随热循环次数的增加趋于稳定,导热系数随加热温度的增加呈线性降低,且在600℃时,合金含量为25%和33%的复合相变材料的导热系数分别为6.51W/m·K和3.45w/m·K。综上所述,Al-Si合金含量为25%和33%的复合相变材料可在特殊行业得到良好的应用。
Composite phase change material formed by Al88Si alloy and kaolin as substrate material is researched for the relationship between content of Al-Si alloy and latent heat and thermal stability of the composite phase change materials.In the research performed were DSC-TG,thermal cycles,microstructure and heat conduction analysis.When Al-Si alloy content changes in the sequence of 50%,33%,25%,20% and 17% after 5,10,15 and 20 times thermal cycles,latent heat of the phase change materials is decreasing and becomes stable after 15 thermal cycles.In addition,the microscopic morphology of the phase change material tends to be stable and the thermal conductivity decreases linearly with increasing temperature.At 600℃,and thermal conductivity of the phase change materials with 25% and 33% Al-Si alloy are 6.51W/m·K and 3.45w/m·K,respectively.In conclusion,phase change material that Al-Si alloy content in 25% and 30% is the best choice for special industry need.
出处
《材料科学与工程学报》
CAS
CSCD
北大核心
2017年第3期463-467,共5页
Journal of Materials Science and Engineering
