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Performance of novel Na 2 SO 4 -NaCl-ceramic composites as high temperature phase change materials for solar power plants (Part II)
Solar Energy Materials and Solar Cells ( IF 6.3 ) Pub Date : 2019-06-01 , DOI: 10.1016/j.solmat.2018.05.028
Yifeng Jiang , Yanping Sun , Sean Li

Abstract The performance of the eutectic Na2SO4-NaCl-α-alumina and-mullite composites (melting point of 626.0 °C) with different salt to ceramic ratios (45:55, 50:50, 55:45, 60:40, wt%) was investigated to evaluate their potential application as novel high temperature (> 600 °C) phase change materials for solar thermal energy storage. The results show that the thermal stability of these composites decreases with increased salt content. The eutectic Na2SO4-NaCl-α-alumina and- mullite (45:55, wt%) composites show better thermal performance than the composites with other mass ratios after 20 thermal heating-freezing cycles at the temperature range of 550–680 °C in air. 300 thermal cycle tests were therefore carried out with each of these two composites to evaluate their longer-term thermal stability. The results show that the cycled Na2SO4-NaCl/α-alumina (45:55, wt%) composite has a weight loss of 4.6% and its heat of fusion decreases from 117.8 J/g to 105.3 J/g while the cycled Na2SO4-NaCl/mullite (45:55, wt%) composite has a weight loss of 6.9% and its heat of fusion decreases from 117.6 J/g to 98.6 J/g. XRD and SEM-EDS analysis confirm that the eutectic Na2SO4-NaCl salt has good chemical compatibility with α-alumina and mullite ceramic materials, where no chemical reaction and phase separation occurs in the two composites during the 300 thermal cycling test. Addition of α-alumina and mullite (55 wt%) to the eutectic Na2SO4-NaCl salt can improve its thermal conductivity by more than 3 times with α-alumina having a better enhancement than mullite.

中文翻译:

新型 Na 2 SO 4 -NaCl-陶瓷复合材料作为太阳能发电厂高温相变材料的性能(第二部分)

摘要 不同盐陶瓷比(45:55、50:50、55:45、60:40,wt%)共晶Na2SO4-NaCl-α-氧化铝-莫来石复合材料(熔点626.0℃)的性能) 进行了研究,以评估它们作为新型高温 (> 600 °C) 相变材料用于太阳能热能存储的潜在应用。结果表明,这些复合材料的热稳定性随着盐含量的增加而降低。共晶 Na2SO4-NaCl-α-氧化铝和-莫来石 (45:55, wt%) 复合材料在 550-680 °C 的温度范围内经过 20 次热加热-冷冻循环后显示出比其他质量比的复合材料更好的热性能。空气。因此,对这两种复合材料中的每一种都进行了 300 次热循环测试,以评估它们的长期热稳定性。结果表明,循环的 Na2SO4-NaCl/α-氧化铝(45:55,wt%)复合材料的重量损失为 4.6%,熔化热从 117.8 J/g 降低到 105.3 J/g,而循环的 Na2SO4- NaCl/莫来石 (45:55, wt%) 复合材料的重量损失为 6.9%,其熔化热从 117.6 J/g 降低到 98.6 J/g。XRD 和 SEM-EDS 分析证实共晶 Na2SO4-NaCl 盐与 α-氧化铝和莫来石陶瓷材料具有良好的化学相容性,在 300 次热循环试验中,两种复合材料均未发生化学反应和相分离。在共晶Na2SO4-NaCl盐中加入α-氧化铝和莫来石(55wt%)可以提高其热导率3倍以上,α-氧化铝比莫来石具有更好的增强作用。6%,其熔化热从 117.8 J/g 降低到 105.3 J/g,而循环的 Na2SO4-NaCl/莫来石 (45:55, wt%) 复合材料的重量损失为 6.9%,其熔化热从 117.6 降低焦/克至 98.6 焦/克。XRD 和 SEM-EDS 分析证实共晶 Na2SO4-NaCl 盐与 α-氧化铝和莫来石陶瓷材料具有良好的化学相容性,在 300 次热循环试验中,两种复合材料均未发生化学反应和相分离。在共晶Na2SO4-NaCl盐中加入α-氧化铝和莫来石(55wt%)可以提高其热导率3倍以上,α-氧化铝比莫来石具有更好的增强作用。6%,其熔化热从 117.8 J/g 降低到 105.3 J/g,而循环的 Na2SO4-NaCl/莫来石 (45:55, wt%) 复合材料的重量损失为 6.9%,其熔化热从 117.6 降低焦/克至 98.6 焦/克。XRD 和 SEM-EDS 分析证实共晶 Na2SO4-NaCl 盐与 α-氧化铝和莫来石陶瓷材料具有良好的化学相容性,在 300 次热循环试验中,两种复合材料均未发生化学反应和相分离。在共晶Na2SO4-NaCl盐中加入α-氧化铝和莫来石(55wt%)可以提高其热导率3倍以上,α-氧化铝比莫来石具有更好的增强作用。XRD 和 SEM-EDS 分析证实共晶 Na2SO4-NaCl 盐与 α-氧化铝和莫来石陶瓷材料具有良好的化学相容性,在 300 次热循环试验中,两种复合材料均未发生化学反应和相分离。在共晶Na2SO4-NaCl盐中加入α-氧化铝和莫来石(55wt%)可以提高其热导率3倍以上,α-氧化铝比莫来石具有更好的增强作用。XRD 和 SEM-EDS 分析证实共晶 Na2SO4-NaCl 盐与 α-氧化铝和莫来石陶瓷材料具有良好的化学相容性,在 300 次热循环试验中,两种复合材料均未发生化学反应和相分离。在共晶Na2SO4-NaCl盐中加入α-氧化铝和莫来石(55wt%)可以提高其热导率3倍以上,α-氧化铝比莫来石具有更好的增强作用。
更新日期:2019-06-01
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