Wetting angle measurement of liquid PbBi on RAFM steel surface based on ellipse fitting

摘要

The fusion power is considered an ideal energy for the future due to abundant, green and safety. Wetting properties between the liquid metal and the structural materials in the liquid blanket of the fusion reactor related to the heat exchange efficiency and the irradiated plasma resistance, and directly related to the service life of the reactor structural materials. This article describes the wetting angle measurement experimental procedure of liquid lead-bismuth (PbBi) at reduced activation ferritic/martensitic steel (RAFM steel) surface based on the high-temperature static sessile drop method under the protection of high purity argon, including the images enhancement processing obtained by CCD camera, using ellipse fitting method to calculate the wetting angle, and were measured at 350-600°C. The experimental results show that the wetting angles of liquid PbBi and RAFM steel are greater than 140°, non-wetting.