In order to improve the low thermal conductivity performance of carbonate molten salt

it is proposed to dope metal magnesium powder with ternary carbonate molten salt (Li2CO3-Na2CO3-K2CO3) to strengthen the thermal conductivity. The static melting method was used to prepare the composite carbonate salts with 1%(mass) or 2%(mass) magnesium powder. The morphology

structure

liquid density

specific heat capacity

and thermal diffusivity were characterized by the scanning electron microscope-energy dispersive X-ray spectrometer (SEM-EDX)

Archimedes method

the differential scanning calorimeter (DIN specific heat measure standard) and the laser flash method

respectively. The thermal conductivity was finally calculated based on the density

specific heat capacity

and thermal diffusivity. The results showed that the introducing of magnesium powder changed the morphology of pure eutectic (ternary carbonate salt)

a large number of spherical particles (2-5 μm) were detected in the composite salts. Comparison with the pure eutectic

the liquid density

thermal diffusivity and thermal conductivity of salt compound doped magnesium powder were enhanced

and the liquid specific heat capacity was diminished. The mean thermal conductivity of salt compound doped with 1% or 2% magnesium powder was enhanced by 21.67% and 19.07%

respectively. So

the 1% salt composite should be the promising HTF due to the enhancement of density

thermal diffusivity and thermal conductivity.