Diffusion Measurements in Molten Metals(<Special Topic>Recent Development in Thermophysical Property Measurements of High-Temperature Melts for Crystal Growth)

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  • 金属融体の拡散係数測定(<特集>結晶成長を支える高温熱物性計測技術の進展)
  • 金属融体の拡散係数測定
  • キンゾクユウタイ ノ カクサン ケイスウ ソクテイ

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Abstract

Recently, a method for diffusion measurements in molten metals was developed by combining the stable density layering of the samples and the shear cell method, which can suppress natural convection on the ground. Furthermore, it became possible to obtain reproducible reliable data of diffusion coefficients by minimization of the shear convection and the Marangoni convection. The impurity diffusion coefficients in liquid Sn and Pb agreed well with the data obtained under microgravity using the shear cell method. The obtained diffusion coefficients were proportional to the square of the temperature. The possible experimental conditions by this method were discussed and the current problems and the future perspectives were remarked.

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