Preparation of monodisperse spherical particles of Bi-Sb system for thermoelectric microdevices

Kouichi Ichiki, Mineo Asano, Akira Kawasaki, Ryuzo Watanabe, Masashi Miyajima

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Monodisperse spherical particles of Bi-12at%Sb alloy with diameter of 200μm were fabricated by the pulsated orifice injection method (POIM), in which molten metal is injected from a small orifice by clipping action of a pressure transmitting diaphragm driven by piezoelectric actuater. The Bi-Sb alloy is a candidate material for thermoelectric cooling micr-odevices because of its excellent thermoelectric property at low temperature. The shape of the obtained particles is spherical with small caps on their surface consisting of Bi phase with negligible Sb content. It has been found that the surface is covered with very thin oxide layer which is less than 100nm as detected by Auger electron spectroscopy. The microstructure is much finner than that of casted material. The effect of injection atmosphere on microstructural change has been discussed on the basis of cooling rate of molten particle during injection.

Original languageEnglish
Pages (from-to)700-705
Number of pages6
JournalFuntai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
Volume44
Issue number7
DOIs
Publication statusPublished - 1997 Jan 1

Keywords

  • Bi-Sb alloy
  • Microdevices
  • Monosized spherical particle
  • Pulsated orifice injection method
  • Thermoelectric material

ASJC Scopus subject areas

  • Mechanical Engineering
  • Industrial and Manufacturing Engineering
  • Metals and Alloys
  • Materials Chemistry

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