Abstract
The shape of solid-liquid interface during the growth of Czochalski copper crystal was investigated by observing the growth striation revealed on the longitudinal section of the pulled crystal. The dependence of the curvature of interface on crystal diameter, crystal rotation rate and pulling rate were searched. Following results were obtained. The shape of solid-liquid interface of copper is convex to the melt. The curvature of interface decreases with an increase of crystal diameter, which could be explained by an approximate equation giving the curvature of solid-liquid interface. On the other hand, the curvature of interface does not almost depend on the crystal rotation rate, which may be attributed to a small Prandtl number of copper melt. The dependence of the curvature on the pulling rate is small too, which is inferred to be caused by a small ratio of the latent heat of fusion to the thermal conductivity for copper.
