臺灣博碩士論文加值系統

硬銲是一種固態接合方法，該接合技術是在接合界面元素產生原子擴散，進而使得擴散層與母材具有相同的物理和機械性能。當應用於異種金屬接合時，可在的接合表面之間預置低熔點之填料，加熱至其熔點以上造成中間層和母材之間相互擴散並促進金屬接合；此外，接合溫度比母材的熔點低得多，因此對母材任何不利影響都可降至最低。本研究以純鋁為中間層對SUS 2205雙相不銹鋼以及Ti-6Al-4V鈦合金以低壓氣氛保護方式進行異種接合，探討其介面化合物之形成以及元素擴散之情況。接合後之試片以光學顯微鏡與掃描電子顯微鏡觀察顯微組織，以能量色散光譜進行成分分析及X 光繞射做相鑑定，最後進行剪強度與微硬度試驗。實驗結果顯示，最佳接合條件為1170℃持溫時間45分鐘，在接合界面上填料與母材之間的原子相互的擴散結合，但隨著持溫時間的增加，介金屬化合物也隨之成長，使其剪強度下降。

Brazing is a solid state joining process. This bonding technique is based on the atomic diffusion of elements at the brazing interface, which has same physical and mechanical properties as base metal. The majority of applications of brazing for the joining of dissimilar metals, a low-melting point interlayer alloy placed between the bonding surfaces is heated above its melting point and diffuses in base metals to provide a very sound brazed joint. Besides, the temperature of diffusion bonding is much lower than the melting point of the base metal and therefore any detrimental effects on the base metal are minimized. In this paper the brazing of duplex stainless steel SUS 2205 to titanium alloy Ti-6Al-4V with a pure aluminum interlayer was studied, and specimens were joined in an argon gas atmosphere using a tunnel furnace. Due to the bond region was affected by the diffusion of some elements from the brazing process therefore the intermetallic compounds formed in the inter transition layer were completely investigated. Microstructure of brazing joints was examined by scanning electron microscopy, and energy dispersive spectroscopy. X-ray diffraction was used to identify the phases formed in the bond region. Eventually the shear strength and the Vickers hardness used to evaluate the mechanical property of the single lap joint. The results of this study revealed, the optimal parameters of dissimilar metal joints has been done at 1170℃ and holding for 45 minutes. Interdiffuse of elements was observed between interlayer and base metals. The interfacial intermetallic compounds grew with increasing holding time, and resulting in low shear strength.

摘要............i
Abstract.......iii
誌謝.............v
目錄............vi
表目錄...........ix
圖目錄...........x
第一章：緒論.......1
1.1 簡介..........1
1.2 研究動機.......1
第二章：文獻探討.....3
2.1 擴散理論........3
2.2 擴散接合........6
2.3 擴散接合的參數...10
2.4 鈦的簡介........13
2.4.1 鈦及鈦合金的特性分類與應用.......13
2.5 雙相不銹鋼簡介.......17
2.5.1 雙相不銹鋼與兩相不銹鋼的優缺點.......19
2.6 純鋁之簡介.......21
2.7 暫態液相接合之應用.......22
2.8 國內外暫態液相接合技術文獻探討.......22
第三章：實驗流程與設備.......25
3.1 實驗流程.......25
3.2 實驗試片準備.......26
3.3 暫態液相接合實驗與參數設定.......27
3.4 金相顯微組織.......28
3.5 硬度試驗.......31
3.6 拉伸剪力試驗.......32
3.7 SEM及EDS成份分析.......33
3.8 X-Ray繞射之結晶構造分析.......34
第四章：實驗結果與討論.......35
4.1 銲接溫度的設定.......35
4.2 接合截面結構組織與元素分析.......36
4.2.1 異種接合.......37
4.2.2 相同材料接合.......48
4.3 剪應力測試分析.......64
4.4 微硬度分析.......65
4.5 X-ray分析.......68
第五章：結論.......70
參考文獻.......71
Extended Abstract.......75
簡歷(CV).......80

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