Dunlop T O, Jarvis D J, Voice W E, Sullivan J H
College of Engineering, Swansea University, Bay Campus, Fabian Way, Swansea, SA1 8EN, UK.
Gervaux Ltd, 79 Davies Road, West Bridgford, Nottingham, NG2 5JB, UK.
Sci Rep. 2018 May 29;8(1):8190. doi: 10.1038/s41598-018-26537-8.
The effect of a variety of metal-chlorides additions on the melting behavior and thermal stability of commercially available salts was investigated. Ternary salts comprised of KNO NaNO and NaNO were produced with additions of a variety of chlorides (KCl, LiCl, CaCl, ZnCl, NaCl and MgCl). Thermogravimetric analysis and weight loss experiments showed that the quaternary salt containing a 5 wt% addition of LiCl and KCl led to an increase in short term thermal stability compared to the ternary control salts. These additions allowed the salts to remain stable up to a temperature of 630 °C. Long term weight loss experiments showed an upper stability increase of 50 °C. A 5 wt% LiCl addition resulted in a weight loss of only 25% after 30 hours in comparison to a 61% loss for control ternary salts. Calorimetry showed that LiCl additions allow partial melting at 80 °C, in comparison to the 142 °C of ternary salts. This drop in melting point, combined with increased stability, provided a molten working range increase of almost 100 °C in total, in comparison to the control ternary salts. XRD analysis showed the oxidation effect of decomposing salts and the additional phase created with LiCl additions to allow melting point changes to occur.
研究了添加多种金属氯化物对市售盐的熔化行为和热稳定性的影响。通过添加多种氯化物（KCl、LiCl、CaCl、ZnCl、NaCl和MgCl）制备了由KNO₃、NaNO₂和NaNO₃组成的三元盐。热重分析和失重实验表明，与三元对照盐相比，添加5 wt% LiCl和KCl的季盐导致短期热稳定性提高。这些添加物使盐在高达630℃的温度下保持稳定。长期失重实验表明稳定性上限提高了50℃。添加5 wt% LiCl后，30小时后的失重仅为25%，而对照三元盐的失重为61%。量热法表明，与三元盐在142℃熔化相比，添加LiCl可使盐在80℃发生部分熔化。与对照三元盐相比，熔点的降低与稳定性的提高相结合，使熔融工作范围总共增加了近100℃。XRD分析显示了盐分解的氧化作用以及添加LiCl产生的额外相，从而导致熔点发生变化。
