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研究生:林敬展
研究生(外文):Chang-Chan Lin
論文名稱:具半赫斯勒結構之熱電鋯鎳錫、鈦鈷錫、鈦鎳錫錫化物粉末之合成研究
論文名稱(外文):Synthesis of Half-Heusler Type Thermoelectric ZrNiSn, TiCoSn, and TiNiSn Stannide Powders
指導教授:吳新明
指導教授(外文):Hsin-Ming Wu
學位類別:碩士
校院名稱:大同大學
系所名稱:材料工程學系(所)
學門:工程學門
學類:綜合工程學類
論文種類:學術論文
論文出版年:2008
畢業學年度:96
語文別:中文
論文頁數:119
中文關鍵詞:機械合金球磨熱電性半赫斯勒
外文關鍵詞:Mechanical alloyingThermoelectric propertiesHalf-Heusler
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具半赫斯勒MgAgAs型式結構之TiCoSn、TiNiSn及ZrNiSn錫化物合金,具有出色的熱電性質。本研究選取具半赫斯勒結構之合金系統Ti-Co-Sn、Ti-Ni-Sn及Zr-Ni-Sn,首先以成份比例1:1:1進行機械合金化球磨,探討生成TiCoSn、TiNiSn及ZrNiSn半赫斯勒錫化物之可行性。次選定Zr-Ni-Sn系統,以Zr1Ni1Sn1成分及其附近之成分進行機械合金化球磨,並進行退火熱處理。結果發現對於Zr1Ni1Sn1起始成分,無論球磨或球磨後加以退火熱處理,皆可得到單一相之半赫斯勒ZrNiSn粉末。在鄰近Zr1Ni1Sn1附近之成份,經球磨後可得到單一相之半赫斯勒ZrNiSn相、及非晶與ZrNiSn相。偏離Zr1Ni1Sn1較遠處,則出現Ni3Sn2相及非晶相。對上述球磨後粉末進行隨後熱處理,可生成半赫斯勒相與二元平衡相、赫斯勒相與二元平衡相,及半赫斯勒與赫斯勒相。對於各初始成份經由機械合金球磨及隨後熱處理後所得到之合金相,大致與Zr-Ni-Sn三元相圖之平衡相相符。
Ternary crystalline TiCoSn、TiNiSn and ZrNiSn stannides have the same structure as the half-Heusler MgAgAs type structure. Alloys with this structure are recognized to possess excellent thermoelectric properties. In this research, Ti-Co-Sn、Ti-Ni-Sn and Zr-Ni-Sn alloy systems having the potential of forming half-Heusler structure were chosen for study. Powders mixtures with three elemental powders in atomic proportion of 1:1:1 were firstly subjected to mechanical alloying to investigate the possibility of forming TiCoSn、TiNiSn and ZrNiSn half-Heusler stannides. The Zr-Ni-Sn alloy system was later chosen to make a broad study on the formation of half-Heusler ZrNiSn phase by mechanical alloying and subsequent annealing treatment on the stoichiometric Zr1Ni1Sn1 composition and its neighbourhood. The results indicate that for the initial stoichiometric Zr1Ni1Sn1 composition, a single half-Heusler ZrNiSn phase can be obtained by mechanical alloying or by mechanical alloying plus subsequent annealing. Ball milling on the powders with compositions in the vicinity of Zr1Ni1Sn1 can produce either complete half-Heusler ZrNiSn phase or ZrNiSn plus amorphous phases. Milling on the powder mixtures with composition ranges farther from the stoichiometric Zr1Ni1Sn1 can produce Ni3Sn2 phase or simply amorphous phase. Subsequent annealing treatment on these milled powders create mixtures of half-Heusler and binary equilibrium phases, Heusler and binary equilibrium phases, or half-Heusler and Heusler phases. The alloy phases obtained after mechanical alloying and subsequent annealing treatment on the initial powder mixtures were roughly coincident with the phases in the Zr-Ni-Sn phase diagram.
摘要 I
Abtract II
圖目錄 VI
表目錄 XI
表目錄 XI
一、前言 1
二、文獻回顧 3
2.1 電傳理論 3
2.2 熱傳理論 5
2.3 熱電效應 [14] 7
2.3.1 Seebeck效應 8
2.3.2 Peltier效應 10
2.3.3 Thomson效應 10
2.3.4 Seebeck 效應、Peltier 效應與Thomson 效應之關聯性 11
2.4 熱電性質 13
2.5 半赫斯勒結構(half Heusler structure)熱電性質 14
三、實驗方法 17
3.1 粉末之製備 17
3.2 結構分析 21
3.3 塊狀熱電合金之製備 21
3.4 光學顯微鏡(OM) 23
3.5 掃描式電子顯微鏡(SEM) 23
3.6 熱分析 23
3.7 退火處理 24
四、結果與討論 25
4.1 Ti-Co-Sn系統 25
4.1.1 結構分析 25
4.1.2 SEM觀察 27
4.2 Ti-Ni-Sn系統 30
4.2.1 結構分析 30
4.3 Zr-Ni- Sn系統 37
4.3.1 結構分析 37
4.3.2 ZrNiSn合金塊材製備 39
4.3.3 Zr-Ni-Sn系統各成份比例之結構分析 45
4.3.4 SEM觀察 63
4.3.5 熱分析 65
4.3.6 熱處理 74
五、結論 97
六、參考文獻 99
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