Thermal Conductivity of Solid and Liquid Phases for Pb-Cd Alloys

Thermal conductivities of solid phases for pure Pb and Pb-x weight % Cd (5, 12, 17.4, 50, and 95) binary alloys were measured with a radial heat flow apparatus. Thermal conductivity depending on temperature and composition for pure Pb and Pb-x weight % Cd (5, 12, 17.4, 50, and 95) binary alloys were obtained to be 32.4 +/- 2.2, 33.4 +/- 2.2, 41.2 +/- 2.8, 37.2 +/- 4.8, 49.2 +/- 3.3, and 84.6 +/- 5.7 W/Km. The thermal conductivity ratio of liquid phase to solid phase for the eutectic Pb-17.4 weight % Cd alloy at its melting temperature is found to be 1.31 with a Bridgman-type directional solidification apparatus. Thus, the thermal conductivity of the liquid phase for the eutectic alloy at its melting temperature was found to be 48.7 +/- 3.3 W/Km by using the values of solid phase thermal conductivity and the thermal conductivity ratio of liquid phase to solid phase.