Cu-Ti-Sn三元合金為用在銲接不同的共價鍵結化合物與金屬化合物的硬銲合金。例如銲接鑽石於金屬上，作為切割用的鑽石刀片或鑽石砂輪。使用Cu-Ti-Sn系三元合金當銲接原料時，其銲接的溫度較高，特別是在鈦金屬高於70 at%時，銲接溫度都要達到1000 °C或以上 。而文獻中，高溫的Cu-Ti-Sn系三元合金的平衡相圖及其相關資料卻不完整。本實驗的目的即是研究Cu-Ti-Sn系三元合金700 °C平衡相圖。
將各成份比例不同的Cu, Ti, Sn以真空電弧熔煉( Arc melting )混合成合金試片，將試片在700 °C下維持720小時均質化熱處理，使其達到相平衡。用電子微探儀( EPMA )來分析各個生成相的組成成份；再使用差示熱分析儀( DTA )來量測其液相溫度( Tl )，根據所有數據分析結果交互比對，最後得到了Cu-Ti-Sn系三元合金700 °C平衡相圖。
實驗結果總共有十二個三相區和二十三個兩相區的生成，其中包含了CuTi5Sn3和CuTiSn兩個三元化合物與十一個二元的介金屬化合物，另在液相區發現了一穩定的L相。CuTi5Sn3和CuTiSn的成份比例範圍與文獻相符合；而在液相區發現之L相的成份範圍為Cu: 15.5-17.6 at%, Ti: 15.6-17.8 at%, Sn: 66.4-68.1 at%。

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壹、前言 1
1-1 研究背景 1
1-2 研究動機 1
貳、文獻回顧 3
2-1. 相平衡 3
2-1-1 Cu-Ti 二元系統相平衡圖 4
2-1-2 Cu-Sn 二元系統相平衡圖 4
2-1-3 Sn-Ti 二元系統相平衡圖 4
2-2 Cu-Ti-Sn系三元合金平衡相圖 5
2-3 Cu-Ti-Sn三元合金的應用 6
參、研究方法及步驟 9
3-1 研究方法 9
3-2 合金試片的選點與切割秤重 9
3-3 合金熔煉混合 10
3-4 封管 11
3-5 均質化熱處理 12
3-6 金相前處理 13
3-7 EPMA的量測分析 13
3-8 熱分析（DTA） 14
肆、研究結果與討論 15
4-1 EPMA分析結果 15
4-1-1 三相區CuTiSn-(α-Cu)-(β-Cu) 15
4-1-2 三相區CuTiSn-(β-Cu)-( γ-Cu) 15
4-1-3 三相區CuTi5Sn3-CuTiSn-(α-Cu) 16
4-1-4 三相區CuTi5Sn3-βTiCu4 -(α-Cu) 17
4-1-5 三相區CuTi5Sn3-Ti3Cu4-βTiCu4 17
4-1-6 三相區CuTi5Sn3-Ti3Cu4-Ti3Sn 18
4-1-7 三相區Ti3Sn-Ti2Cu-TiCu 19
4-1-8 三相區Ti3Sn-Ti2Sn-CuTi5Sn3 19
4-1-9 三相區(α-Ti)-Ti3Sn-Ti2Cu 20
4-1-10 三相區CuTi5Sn3-Ti6Sn5-CuTiSn 21
4-1-11 三相區L-Ti6Sn5-CuTiSn 21
4-1-12 三相區L-(γ-Cu)-CuTiSn 23
4-1-13 液相區與L相 23
4-1-14 Cu-Ti-Sn系三元合金700 °C平衡相圖 24
4-2 DTA分析結果 24
伍、結論 26
陸、參考文獻 28

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