Molecular Dynamics Study of the Interfacial Thermal Conductance Between Binary Nitric Acid Compound Salt and AlN Ceramics
Compared with traditional phase change materials,ceramic matrix composite phase change materials have the advantages of high heat storage capacity and good thermal conductivity,so it has a great application prospect in the field of heat storage.In this study,molecular dynamics simulation was carried out on the heat transport at the interface between binary nitric acid compound salt and AlN ceramics,and the effect of compound ratio on the interface heat conduction was studied.Through the analysis of phonon density of states,phonon overlap energy and phonon participation ratio,the results show that as the mass fraction of sodium nitrate is positively correlated with interface thermal conductance,the interfacial thermal conductance of pure sodium nitrate/AlN is about 8.6％higher than that of pure potassium nitrate/AlN,mainly because the phonon vibration matching degree between sodium nitrate and AlN interface is better and the phonon participation rate is higher than that of potassium nitrate.
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