MEASUREMENTS OF THERMOPHYSICAL PROPERTIES IN HIGH-TEMPERATURE MELTS

The levitated drop method has been used to measure the surface tension s, densities and enthalpies of liquid metals and alloys. Undercoolings of 300-degrees-C were recorded for pure metals but only 50-degrees-C could be obtained for austenitic stainless steels. Surface tensions fo r the undercooled state of pure Fe, Ni and Au were found to be linear extrapolations of the data obtained for the liquid phase. Densities fo r the liquid state of Fe, Ni and commercial alloys were found to be wi thin +/-2% of accepted values. A levitated drop calorimeter has been c onstructed for the measurement of enthalpies and heat capacities of me tals and alloys to an accuracy of +/-1%. Measurements of the densities and enthalpies for the liquid and undercooled states of metals and co mmercial alloys will be carried out in the near future.