Abstract
Nitrate salt is an important heat transfer and thermal storage medium. Its thermo-physical properties, including melting point, freezing point, decomposition temperature and latent heat, play an important role in industrial application. However, in high temperature environment, the "climbing wall" phenomenon (overflow the crucible along the crucible wall) and corrosion with the crucible occurred for nitrates. In order to reduce the impact of these phenomena on the experimental results, the influence of the crucible with different materials on the experimental results were analyzed in this paper by differential scanning calorimetry - (DSC). In the temperature range of 40 ~750 ℃, the thermo-physical properties of LiNO3 and mixed nitrate were measured with aluminum, Al2O3, graphite and platinum crucibles respectively, and the effects of these four type crucibles upon experimental data results were analyzed. Some factors such as the accuracy of data, stability, "climbing wall" phenomenon and cost were considered and discussed. The results show that the data of aluminum crucible are more accurate and economical when the maximum temperature of tests is below 500 ℃, but when the maximum temperature of tests is higher than 500 ℃, using graphite crucible is more reasonable.
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