Microstructures of Directionally Solidified Si-TaSi2 Eutectic in situ Composite for Field Emission

doi:10.3724/SP.J.1077.2007.01019

Abstract

Abstract: The directionally solidified Si-TaSi₂ eutectic in ~situ composite for field emission was prepared with the electron beam floating zone melting (EBFZM) technique. The microstructure characteristic of Si-TaSi₂ eutectic was systematically investigated. The Si-TaSi₂ eutectic in ~situ composite, which has high-aligned and uniformly-distributed TaSi₂ fibers in the Si matrix, can be obtained when the solidification rate changes from 0.3mm/min to 9.0mm/min. With the increase of the solidification rate, the diameter and the inter-rod spacing of the TaSi₂ fibers are decreased, while the density and the volume fraction of the fibers are increased. The solid/liquid interface is studied by the zero power method as well. When the solidification rate varies from 0.3mm/min to 5.0 mm/min, the solid/liquid interface morphology
has the following evolution processing: planar interface→shallow cell interface→cell interface→planar interface.

Key words: directional solidification, electron beam floating zone melting, Si-TaSi₂ eutectic in situ composite, solid/liquid interface

CLC Number:

TG244
O782

CUI Chun-Juan,ZHANG Jun,SU Hai-Jun,WANG Hong,LIU Lin,FU Heng-Zhi. Microstructures of Directionally Solidified Si-TaSi₂ Eutectic in situ Composite for Field Emission[J]. Journal of Inorganic Materials, DOI: 10.3724/SP.J.1077.2007.01019.

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Microstructures of Directionally Solidified Si-TaSi₂ Eutectic in situ Composite for Field Emission

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