In Situ Observation of Phase Separation of a Barium Borate Melt in a Stable Immiscibility Region under Microgravity |
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| Authors: | Satoru Inoue Akio Makishima Hiroyuki Inoue Kohei Soga Tomoya Konishi Tomoyoshi Asano Yuu Ishii Masato Koyama |
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| Affiliation: | Department of Materials Science, The University of Tokyo, Bunkyo-ku, Tokyo 113, Japan;Japan Space Utilization Promotion Center, Shinjuku-ku, Tokyo 169, Japan |
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| Abstract: | The precipitation of droplets was directly observed on a BaO–B2O3 melt in a drop shaft experiment. This is the first time that precipitation of droplets has been observed in a 4.5 s drop test. The melt film of 4BaOz96B2O3 (mol%) held on a platinum wire loop was heated above the critical tem-perature 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. |
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