Preparation of Monodisperse Spherical Particles of Bi-Sb System for Thermoelectric Microdevices
Preparation of Monodisperse Spherical Particles of Bi-Sb System for Thermoelectric Microdevices
复制标题
热电微器件用Bi-Sb系单分散球形颗粒的制备
DOI：
10.2497/jjspm.44.700
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发表时间：
1997
期刊：
影响因子：
--
通讯作者：
M. Miyajima
中科院分区：
文献类型：
--
作者：
K. Ichiki;M. Asano;A. Kawasaki;R. Watanabe;M. Miyajima
采用脉冲喷孔喷射法（POIM）制备了直径为200μm的Bi-12at%Sb合金单分散球形颗粒。Bi-Sb合金具有优良的低温热电性能，是热电致冷微型器件的候选材料，所制备的颗粒为球形，表面有小帽，由Bi相组成，Sb含量可忽略不计。俄歇电子能谱分析表明，氧化层厚度小于100 nm。其显微组织比铸态材料细得多。根据注射过程中熔体颗粒的冷却速率，讨论了注射气氛对组织变化的影响。
Monodisperse spherical particles of Bi-12at%Sb alloy with diameter of 200μm were fabricated by the pul-sated 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 fmner 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.