Mg2(Sn, Si, Sb) solid solution have attracted considerable attention for use in thermoelectric generators due to low cost, eco-friendly and light weight properties. In this research, Mg2(Sn, Si, Sb) thermoelectric materials were prepared by casting, ball milling and spark plasma sintering. These manufacturing processes are expected to mass production of Mg2(Sn, Si, Sb) alloy thermoelectric materials and reduce the cost. In order to stabilize the quality of the samples, we try to improve the melting and sintering process. Due to change the melting technique, Sb residual fraction increased from 29.7% to 95% or more and avoid the appearance of pure tin phase in the as-cast samples. The liquid phase formed by the powder during the spark plasma sintering process is extruded. According to the Mg-Sn-Si ternary phase diagram, the temperature of liquid phase generated is 562.9 ℃, so change the sintering process at 500 ℃ holding temperature can effectively improve the extrusion situation. Mg2(Sn, Si, Sb) thermoelectric alloy has the high ZT value of 1.52 at 665K because the power factor of Mg2(Sn, Si, Sb) increased by adjusting the alloy composition.

摘要 i
ABSTRACT ii
目錄 iii
表目錄 vi
圖目錄 vii
第一章 緒論 1
1.1. 前言 1
1.2. 熱電材料歷史 1
1.3. 研究動機及目的 2
第二章 基礎與文獻回顧 7
2.1. 熱電特性簡介 7
2.1.1. Seebeck係數 7
2.1.2. 電導率 7
2.1.3 功率因子 8
2.1.4. 熱導率 8
2.1.5. 熱電優值 9
2.2. 熱電塊材製備方法 10
2.2.1. 熔煉法 10
2.2.2. 固相反應法 11
2.2.3. 機械合金製程 11
2.2.4. 熱壓燒結與火花電漿燒結 11
2.3. 矽化鎂基熱電材料之相關背景 12
2.3.1 Mg2SnXSi1-X化合物簡介 12
第三章 實驗步驟與方法 17
3.1. 實驗原料 17
3.2. 實驗流程 17
3.2.1. 以熔煉製成Mg-Sn-Si-Sb合金 17
3.2.2. 球磨細化粉末 17
3.2.3. 火花電漿燒結(spark plasma sintering, SPS) 18
3.2.4. 結構分析 18
3.2.5. 顯微結構分析 18
3.2.6. 成分分析 18
3.3. 熱電特性分析 19
3.3.1. 電導率與Seebeck係數量測 19
3.3.2. 熱導率量測 19
3.3.2.1. 熱擴散係數量測 19
3.3.2.2. 密度量測 20
3.3.2.3. 比熱量測 20
第四章 結果與討論 27
4.1. 鑄態試片分析 27
4.1.1. 鑄態試片顯微組織分析 27
4.1.2. 鑄態試片結晶結構分析 28
4.1.3. 鑄態試片Sb含量分析 28
4.2. 火花電漿燒結試片分析 29
4.2.1. 火花電漿燒結試片顯微組織分析 29
4.2.2. 火花電漿燒結試片結晶結構分析 29
4.3. Mg2(1+y)Sn0.6Si0.4-xSbx合金之熱電性能 29
4.3.1. Mg2(1+y)Sn0.6Si0.4-xSbx合金之電導率 30
4.3.2. Mg2(1+y)Sn0.6Si0.4-xSbx合金之Seebeck係數 30
4.3.3. Mg2(1+y)Sn0.6Si0.4-xSbx合金之功率因子 31
4.3.4. Mg2(1+y)Sn0.6Si0.4-xSbx合金之熱導率 31
4.3.5. Mg2(1+y)Sn0.6Si0.4-xSbx合金之熱電優值 32
4.4. 製程缺陷與改善 32
4.4.1. 去除鑄胚內部爐渣 32
4.4.2. 鑄胚內純錫相生成與防止 32
4.4.3. SPS燒結過程擠出原因與改善 33
4.4.3.1. SPS燒結製程改善分析 34
第五章 結論 65
第六章 參考文獻 66

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