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Title: 摻雜γ-Al2O3之Bi-Sb-Te熱電複合材料特性研究
Thermoelectric properties of γ-Al2O3 doped Bi-Sb-Te materials
Authors: Tsai, Chia-Chan
Contributors: NTOU:Institute of Materials Engineering
Keywords: Bi0.4Sb1.6Te3;γ-Al2O3;機械合金;真空熱壓;熱電複合材料
Bi0.4Sb1.6Te3;γ-Al2O3;mechanical alloying;vacuum hot pressing;thermoelectric nanocomposites
Date: 2015
Issue Date: 2017-05-24T08:17:33Z
Abstract: Bi、Sb、Te純元素粉末經高能量球磨2小時後可形成具(Bi0.2Sb0.8)2Te3單一結晶相的Bi0.4Sb1.6Te3合金粉末,將此粉末再與不同重量百分比之γ-Al2O3粉末球磨混合30分鐘後,可製備出具微米/奈米混成結構之γ-Al2O3/Bi0.4Sb1.6Te3複合材料粉末,此粉末經真空熱壓後可成型為直徑20mm、厚10mm之γ-Al2O3/ Bi0.4Sb1.6Te3複合材料塊材。在γ-Al2O3/Bi0.4Sb1.6Te3合金粉末於熱壓前後X-ray繞射圖中可發現,因γ-Al2O3 主要峰值強度太低且多與(Bi0.2Sb0.8)2Te3結晶相繞射峰重疊,導致無法觀察到γ-Al2O3繞射峰,含1 wt % γ-Al2O3之Bi0.4Sb1.6Te3熱電複合塊材因導電率較高其最大ZT 值出現在50℃及75℃下為1.22。添加3 wt % γ-Al2O3之Bi0.4Sb1.6Te3 熱電複合塊材因導熱率較低,故最大ZT 值在100℃及125℃下亦可達1.21。
Bi0.4Sb1.6Te3 alloy powder with (Bi0.2Sb0.8)2Te3 single crystalline phase can be formed by 2 hours high energy ball milling of Bi, Sb and Te pure elemental powder mixtures. The Bi0.4Sb1.6Te3 powders were further milled with γ-Al2O3 powder in different weight percentages for 30 minutes to prepare the γ-Al2O3/Bi0.4Sb1.6Te3 composite powders with micro/nano hybrid structure. The composite powder was consolidated into bulk shape with a diameter of 20 mm and thickness of 10 mm by using vacuum hot pressing process. The diffraction peaks of γ-Al2O3 phase were vanished for γ-Al2O3/Bi0.4Sb1.6Te3 composites before and after consolidation. The low diffraction peak intensity as well as overlapping peak position with (Bi0.2Sb0.8)2Te3 crystal phase were suggested to be responsible for the absence of the diffraction peaks of γ-Al2O3 phase. For Bi0.4Sb1.6Te3 bulk sample containing 1 wt % γ-Al2O3, the highest ZT value of 1.22 was observed at 50℃ and 75℃ due to its exceptional high electric conductivity. On the other hand, with a relatively lower thermal conductivity, the maximum ZT value of 1.21 at 100 ℃ and 125 ℃ can be reached for Bi0.4Sb1.6Te3 thermoelectric composite doping with 3 wt % γ-Al2O3.
URI: http://ethesys.lib.ntou.edu.tw/cgi-bin/gs32/gsweb.cgi?o=dstdcdr&s=G0010255014.id
Appears in Collections:[材料工程研究所] 博碩士論文

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