Author

Tadaharu KAWAMURA and Katsuhisa NAGAYAMA

Organization

Department of Materials Science, Faculty of Engineering, Shibaura Institute of Technology

Abstract

Using a drop tube process， single crystal formation of Si particles has been reported by K. Kuribayashi et al. However, the solidification morphology and microstructure of Si with Fe, Nd, and Gd additions has yet to be explained. In this study, we have prepared Si particles with Fe， Nd， and Gd additions using a short-drop tube apparatus with a freefall length of 2.5 m. In addition, we have investigated the effect of the additional elements upon the solidification morphology and microstructure of Si. The binary Si particles with Fe additions formed α-FeSi₂. The binary Si particles with Nd or Gd additions formed eutectic structures comprising Si and NdSi_1.8 or Si and GdSi₂ silicide compound. The ternary Si particles with added Fe and Nd or Gd formed eutectic structures comprising α-FeSi₂ and NdSi_1.8 or α-FeSi₂ and GdSi₂ silicide compounds.

Keyword(s)

Drop tube, Si particle, Crystal growth, Silicide, Eutectic structure

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Received 22 December 2015, accepted 10 April 2016, published 30 April 2016

© The Japan Society of Microgravity Applicaiton

この投稿文は次の言語で読めます: Japanese