無重力下でのマランゴニ対流(<特集>無重力下における結晶成長)

概要

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For material processing in space it is expected that the uniform distribution of dopant will be achieved because buoyancy convection will be suppressed under microgravity. However, it is hard to avoid the temperature gradient along free surface in crystal growth process accompanied with heating and cooling. And then surface tension changes along free surface. This unbalance generates convective motion (called Marangoni convection) which becomes to effect strongly upon crystal quality. Some examples of defects in crystals have been reported that was considered to be caused by Marangoni convection. Many fundamental researches have been conducting to clarify the characteristics of Marangoni convection. The present authors have also conducted a flow visualization experiment of Marangoni convection for a project Fuwatto '92 where crystal growth was modeled. In the present report, the flow characteristics of Marangoni convection, its effect on crystal growth and control methods of the convection are summarized as well as the result of Fuwatto '92.
日本結晶成長学会の論文
1994-09-25