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研究生:邱國峻
論文名稱:三元熱電系統Ag-Sn-Te之相平衡與液相線投影圖
論文名稱(外文):Phase equilibria and liquidus projection of thermoelectric Ag-Sn-Te alloys
指導教授:陳信文陳信文引用關係
學位類別:碩士
校院名稱:國立清華大學
系所名稱:化學工程學系
學門:工程學門
學類:化學工程學類
論文種類:學術論文
論文出版年:2012
畢業學年度:100
語文別:中文
論文頁數:141
中文關鍵詞:熱電材料液相線投影圖相平衡圖
外文關鍵詞:Ag-Sn-Te
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Ag-Sn-Te三元系統具有熱電應用上之重要性,尤其Ag2Te為重要的熱電材料。本研究探討Ag-Sn-Te三元系統的液相線投影圖與500℃恆溫相平衡圖。液相線投影圖的實驗方法為依所需比例秤取適量純元素Ag、Sn、Te,總重約1g。再將秤取的元素放入石英管,抽真空後封管。放入980℃高溫爐熱處理兩天熔融均勻後放入水中淬冷;而恆溫相平衡的實驗步驟類似液相線,差別在980℃高溫爐熱處理兩天熔融完之後改放入500℃爐子長時間放置約11個月等待合金達相平衡。利用SEM、EDX、EPMA對液相線與相平衡的合金進行金相與組成分析。Ag-Sn-Te三元系統的液相線投影圖存在11個首要析出相,分別為Sn、Ag、Te、ε(Ag3Sn)、ξ(Ag4Sn)、γAg2Te、βAg2Te、Ag1.9Te、βAg5Te3、SnTe以及一個三元相AgSnTe2。此外在富銀區存在miscibility gap。利用DTA得到的升溫曲線測出析出相生成溫度以及搭配二元相圖預估液相線投影圖在固化時的走向來研究固化路徑。Ag-Sn-Te系統500℃恆溫相平衡圖有4個三相區、9個兩相區以及六個單相區。
摘要 ........................................................................................................................... Ⅰ
目錄 .......................................................................................................................... Ⅱ
圖目錄...................................................................................................................... Ⅴ
表目錄.....................................................................................................................XV
一、 前言 ............................................................................................................... 1
二、文獻回顧 ....................................................................................................... 6
2-1相圖 .............................................................................................................................. 6
2-1-1 Ag-Sn二元相圖 .................................................................................... 6
2-1-2 Ag-Te二元相圖 ..................................................................................... 6
2-1-3 Sn-Te二元相圖 ..................................................................................... 7
2-2 Ag-Sn-Te三元系統相平衡圖 .................................................................... 7
2-3 Ag-Sn-Te三元系統液相線投影圖 ............................................................ 8
三、實驗方法 ..................................................................................................... 18
3-1 Ag-Sn-Te三元液相線投影圖 .................................................................. 18
3-1-1合金製備 ......................................................................................................... 18
3-1-2合金分析 ......................................................................................................... 19
3-1-3熱差分析儀 .................................................................................................... 21
III
3-2 Ag-Sn-Te三元系統500℃相平衡 ............................................................ 21
四、結果與討論 ......................................................................................................... 23
4-1 Ag-Sn-Te三元液相線投影圖 ..................................................................... 23
4-1-1 首要析出相: Ag3Sn ...............................................................................23
4-1-2 首要析出相: SnTe ...................................................................25
4-1-3 首要析出相: Te ......................................................................27
4-1-4 首要析出相: Ag5Te3、Ag1.9Te ..............................................30
4-1-5 首要析出相: AgSnTe2 ............................................................32
4-1-6 首要析出相: Sn........................................................................33
4-1-7 首要析出相: Ag .....................................................................34
4-1-8 miscibility gap區-Ag2Te、Ag4Sn.........................................34
4-2 Ag-Sn-Te相平衡..........................................................................37
4-2-1 SnTe+Ag4Sn兩相區............................................................37
4-2-2 SnTe+Ag2Te兩相區...........................................................................38
4-2-3 Ag4Sn+Ag2Te兩相區...........................................................................38
4-2-4 Ag +Ag2Te兩相區.................................................................................39
4-2-5 Liquid (Sn端)+SnTe兩相區...........................................................39
IV
4-2-6 Liquid (Te端)+SnTe兩相區...........................................................40
4-2-7 Ag4Sn+SnTe+Liquid三相區..............................................................41
4-2-8 Ag4Sn+SnTe +Ag2Te三相區..........................................................41
4-2-9 SnTe單相區...........................................................................................42
4-2-10 Liquid(Sn端)單相區............................................................................42
4-2-11 Liquid(Te端)單相區............................................................................43
4-3 熱分析...............................................................................................................128
4-3-1 L=Te+Ag5Te3+AgSnTe2.............................................................................128
4-3-2 L=Sn+Ag3Sn+SnTe ....................................................................................129
4-3-3 L+ SnTe =Te+ AgSnTe2 .............................................................................129
4-3-4 DTA結論 ..................................................................................................... 130
五、結論 .............................................................................................................. 138
六、參考文獻 ................................................................................................... 139
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