Abstract
The molten nitrate salt has become one of the most promising heat storage and transfer medium for solar energy. A series of molten salt systems containing KNO3-NaNO3, Ca(NO3)2-NaNO3, KNO3-Ca(NO3)2 and KNO3-NaNO3-Ca(NO3)2 were designed and prepared to study the liquidus surface, and the thermal stability of the KNO3-NaNO3-Ca(NO3)2 ternary system was mainly studied. A 3D stable molten temperature diagram was developed to predict melting points and thermal decomposition points in the KNO3-NaNO3-Ca(NO3)2 ternary system, as well as its eutectic temperature and composition. The predicted eutectic composition is 42% KNO3-17% NaNO3-41% Ca(NO3)2, which has a low predicted melting point of 129.1 °C and a high predicted decomposition temperature of 597.9 °C. Moreover, a series of melting points and thermal decomposition points obtained from the 3D stable molten temperature diagram were respectively verified experimentally using thermo-gravimetric (TG) and differential scanning calorimetry (DSC) methods. The experimental results were in excellent agreement with that of obtained values from the 3D stable molten temperature diagram.
Original language | English (US) |
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Pages (from-to) | 225-233 |
Number of pages | 9 |
Journal | Vacuum |
Volume | 145 |
DOIs | |
State | Published - Nov 2017 |
Keywords
- 3D stable molten temperature diagram
- KNO-NaNO-Ca(NO)
- Molten salt
- Thermal stability
ASJC Scopus subject areas
- Instrumentation
- Condensed Matter Physics
- Surfaces, Coatings and Films