鎂矽錫熱電材料之製程開發及模組研究

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姓名

龔筱筑(Hsaio-Chu Kung) 查詢紙本館藏

畢業系所

電機工程學系

論文名稱

鎂矽錫熱電材料之製程開發及模組研究
(Process Innovation and Module Development of Mg2(Si,Sn) Thermoelectric Materials)

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摘要(中)

環境變遷與能源議題是現今社會上很大的問題，熱電材料是一個以材料本身，使得熱能與電能之間能夠互相轉換，並在轉換過程中無任何廢物及汙染產生的發電方式，若能有效利用將是十分環保的能源使用方式，將其應用於廢熱回收、溫差發電、熱電置冷等，當中影響熱電效應的好壞主要取於熱電材料本身具有的熱電優值(ZT)。
本研究以探討熱電材料的特性及將其做成模組探討ZT值，從材料製作到模組皆由本實驗室完成，將粉末冷壓成塊材，利用不同溫度退火，製作出結構及特徵峰值明確的粉末，再次冷壓退火，製作出結構穩固的試片，利用這個試片做成模組，並量測其特性。

摘要(英)

Climate change and energy issues are big topics in today′s society.
Thermoelectric power generation is one kind of power generation methods that uses materials themselves to convert heat into electricity without any waste or pollution during the conversion process. The effect can be applied to waste heat recovery, temperature difference power generation, thermoelectric cooling, etc. The impact of the thermoelectric effect is mainly taken from the thermoelectric quality (ZT) of the thermoelectric material.
This study explores the characteristics of thermoelectric materials and modules to investigate the ZT values. From materials to module fabrication, we innovate a new method to produce Mg2(Si,Sn) nanopowders and bulks by powder mixing, cold-pressing and different annealing processes, and a module for thermoelectric characteristic measurement.

關鍵字(中)

★ 熱電材料
★ 熱電模組
★ ZT值

關鍵字(英)

★ thermoelectric materials
★ thermoelectric modules
★ ZT values

論文目次

目錄
摘要 i
致謝 iii
第一章緒論 1
1.1研究動機 1
1.2研究目的 2
第二章基礎原理與文獻回顧 4
2.1基礎原理 4
2.1.1塞貝克效應 4
2.1.2帕爾貼效應 5
2.1.3 湯姆森效應 5
2.2熱電優值 6
2.2.1熱電優值定義 6
2.2.2熱電轉換效率 7
2.3熱電應用 7
2.4文獻 10
2.4.1溶融法+退火(melting+annealing) 10
2.4.2溶融法+熱壓(melting+hot pressing) 11
2.4.3球磨+熱壓(ball milling+hot pressing) 12
2.4.4熱熔紡絲+火花電漿(MS+SPS) 15
第三章實驗方法與儀器 20
3.1實驗方法 20
3.1.1球磨矽粉末 20
3.1.2混合粉末與摻雜 20
3.1.3冷壓成塊材 20
3.1.4封管與退火 20
3.1.5組裝模組 20
3.2量測儀器 21
3.2.1電導率量測 21
3.2.2塞貝克(seebeck)量測 23
3.2.3密度量測 24
3.2.4熱擴散量測 25
3.2.5比熱量測 25
3.2.6熱導率量測 26
3.2.7熱電優值(ZT figure of merit) 26
3.2.8結構分析 27
3.2.9材料分析 27
3.2.10 模組電性分析 28
第四章實驗流程與步驟 31
4.1前言 31
4.2實驗設計及流程 32
4.3實驗步驟 33
4.3.1矽粉末球磨 33
4.3.2 N-type摻雜 35
4.3.3 混和Mg、Si、Sn粉末 37
4.3.4冷壓成塊材 38
4.3.5封管與退火/碳紙包覆與退火 39
4.3.6粉末化重新壓塊再燒結 40
4.3.7組裝模組 40
第五章實驗結果與討論 42
5.1前言 42
5.2 N-type試片觀察與分析 43
5.2.1退火後塊材形貌 43
5.2.2掃描電子顯微鏡(SEM) 46
5.2.3 X射線衍射儀(XRD) 48
5.2.4電阻率量測 53
5.2.5塞貝克(Seebeck)量測 55
5.2.6熱導率(k)量測 56
5.2.7熱電優值(ZT值)與功率因子 57
5.2.8 N-type不同方法之數據比較 58
5.3 P-type試片觀察與分析 59
5.3.1退火後塊材形貌 59
5.3.2掃描電子顯微鏡(SEM) 60
5.3.3電阻率量測 61
5.3.4塞貝克(Seebeck)量測 62
5.3.5熱導率(k)量測 62
5.3.6熱電優值(ZT值)與功率因子 63
5.4 模組觀察與分析 64
5.4.1模組外觀 64
5.4.2模組量測 64
5.4.3模組量測數值 65
第六章結論 66
參考文獻 67

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指導教授

辛正倫(Cheng-Lun Hsin)

審核日期

2019-7-19

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