Effects of crystal growth rate and pressure on shape controllability in the dewetting micro-pulling-down method

Abstract

The dewetting micro-pulling-down (μ-PD) method is a type of μ-PD method that utilizes low-wettability insulating materials with melts. This method enables the direct fabrication of difficult-to-process alloy wires from molten material. Using this method, in certain systems, a deviation between the theoretically predicted wire diameter based on the static contact angle and the experimentally obtained wire diameter has been observed. In this study, it was hypothesized that this deviation could be explained by the velocity-dependence of the advancing contact angle, based on previous theoretical considerations. This hypothesis was experimentally verified by observing changes in the wire diameter during the pulling process of iridium and ruthenium. Furthermore, crystal growth was carried out under different pressure conditions, demonstrating that the behavior and surface state during crystal growth can be explained by variations in the angle conditions at the meniscus endpoint.