抄録
A new melting technique has been developed to measure the surface tension, γ, of levitated metal droplets oscillating about their spherical equilibrium shapes. Using this technique, surface tension is calculated from Rayleigh’s equation, after making an experimental determination of the droplet oscillation frequency. The applicability of Rayleigh’s equation to levitated metallic droplets is demonstrated, although it is shown that oscillation frequency, and hence the calculated value of surface tension, is a sensitive function of oscillation amplitude and that only low amplitude oscillations lead to reliable values of γ.
The surface tension of liquid copper was evaluated in an atmosphere of hydrogen over the temperature range of 1000 to 1330°C, including for the first time experimental data which make a substantial, 80°C incursion into the supercooled range. The surface tension of copper was found to vary linearly with temperature over the entire range investigated, with the results being represented by the equation:
γ=1390−0.43(t−1083)dyne/cm
where t is temperature in °C.
