In Situ Observation Of Phase Separation Of A Barium Borate Melt In A Stable Immiscibility Region Under Microgravity

The precipitation of droplets was directly observed on a Ba0-B203 melt in a drop shaft experiment. This is the first time that precipitation of droplets has been observed in a 4.5s drop test. The melt film of 4Ba0.96B203 (mol%) held on a platinum wire loop was heated above the critical temperature to produce uniformity and was cooled down to the phase separation temperature range. Phase separation of the melt was observed directly with a video camera. The IR image of the melt was simultaneously detected with a CCD array and was converted into a two-dimensional thermograph.