臺灣博碩士論文加值系統

摘 要
紅外線硬銲接合法具有快速之升降溫速率之製程特性，可降低基材暴露於高溫熱歷程下之不良影響，且能避免因過長的加熱及保溫，而使脆性化合物層擴大。本研究利用純鋁箔與NICROBRAZ－L.M.為硬銲填料，針對Fe-28at.%Al基材進行紅外線硬銲接合。純鋁箔與Fe-28at.%Al基材的硬銲反應所生成的Al-rich之Fe-Al介金屬相可藉由Fe-Al二元相圖加以解釋，其中包含FeAl3、Fe2Al5、FeAl2、FeAl及高溫ε相，於各硬銲溫度條件下分別形成。NICROBRAZ－L.M.鎳基填料與Fe-28at.%Al基材之接合介面則十分複雜，除了由填料的Ni原子與基材的Al原子反應生成Ni3Al界面層外，殘留填料區則包含了γ''-Ni3(Si,Al)+γ-(Ni,Fe)相基地，塊狀(Fe,Cr,Ni)2B相，以及CrxBy之顆粒析出。本研究以此兩種填料進行接合，在高溫之固相擴散作用與長時間的均質化處理下，最終均能獲得與基材近乎一致的接合介面組織。

Abstract
The Infrared vacuum brazing process which is characterized with a rapid thermal cycle can reduce the disadvantage of the base metal exposed under high temperature and minimize the growth of the brittle intermetallic layers after long holding time. The present work reports a novel approach in joining Fe3Al by infrared brazing using both pure Al foil and Nicrobraz L.M. as brazing filler metals. For the case of pure Al foil as braze alloy, various iron aluminide phases such as FeAl3, Fe2Al5, FeAl2, FeAl, and the high temperatureεphase were observed in the joint for different brazing temperatures, and the formation of these phases can be explained by the binary Fe-Al phase diagram. For the other case of NICROBRAZ－L.M. as filler alloy, the reaction between it and Fe-28at.%Al base metal is much complex. The Ni3Al interfacical zone is formed by the reaction of the Ni atom (from filler metal) and Al atom (from base metal), and the braze zone includes γ’-Ni3(Si,Al) phase +γ-(Ni,Fe) phase matrix, bulkly (Fe,Cr,Ni)2B phase, and the CrxBy precipitates. With raising the brazing temperature and increasing the annealing time after brazing, the microstructure of the joint interface will finally be similar to that of the base metal in both cases.

中文摘要………………………………………………………………………i
英文摘要……………………………………………………………………ii
目錄…………………………………………………………………………iii
一.簡介………………………………………………………………………1
二.文獻回顧…………………………………………………………………7
2-1 Fe3Al型介金屬化合物合金特性與機械性質之探討…………………7
2-1.1 Fe3Al型介金屬化合物之合金相圖與其結構之簡介……………7
2-1.2 Fe3Al型介金屬之韌化……………………………………………8
2-1.3 Fe3Al型介金屬化合物之高溫強度的改善………………………9
2-1.4 Fe3Al型介金屬之氫脆性…………………………………………9
2-1.5 Fe3Al型介金屬化合物之高溫耐蝕及抗氧、硫化特性………10
2-2鐵鋁介金屬銲接性評估與紅外線硬銲接合之製程特性………………12
2-2.1鐵鋁介金屬之銲接………………………………………………12
2-2.2擴散接合之研究…………………………………………………13
2-2.3硬銲接合之特性…………………………………………………16
2-2.4紅外線硬銲接合製程及其特性…………………………………17
三.實驗方法…………………………………………………………………29
3-1 硬銲基材之試片準備…………………………………………………29
3-2 硬銲填料之選擇與準備………………………………………………29
3-3紅外線加熱處理………………………………………………………30
3-3.1 實驗設備………………………………………………………30
3-3.2 接合方式………………………………………………………30
3-3.3 接合夾具………………………………………………………30
3-3.4 硬銲接合實驗…………………………………………………31
3-3.5 持溫時間之控制………………………………………………31
3-4 接合介面分析…………………………………………………………32
3-4.1 分析前處理……………………………………………………33
3-4.2 分析儀器………………………………………………………33
四.以鋁箔為填料之Fe-28Al紅外線硬銲接合與其接合介面之研究……42
4-1 Fe-Al二元系統中之介金屬相………………………………………42
4-2二元系統中固-液介面之介金屬中間層成長理論……………………44
4-3層狀介面組織…………………………………………………………51
4-4 Fe3Al/Al/Fe3Al紅外線硬銲接合介面組織…………………………53
4-4.1 Fe3Al/Al/Fe3Al紅外線硬銲於700℃下之接合介面組織……53
4-4.2 Fe3Al/Al/Fe3Al紅外線硬銲於800℃下之接合介面組織……54
4-4.3 Fe3Al/Al/Fe3Al紅外線硬銲於900℃下之接合介面組織……55
4-4.4 Fe3Al/Al/Fe3Al紅外線硬銲於1000℃下之接合介面組織…56
4-4.5 Fe3Al/Al/Fe3Al紅外線硬銲於1050℃下之接合介面組織…57
4-4.6 Fe3Al/Al/Fe3Al紅外線硬銲於1100℃下之接合介面組織…57
4-4.7 Fe3Al/Al/Fe3Al紅外線硬銲於1150℃下之接合介面組織…60
4-4.8 Fe3Al/Al/Fe3Al紅外線硬銲於1200℃下之接合介面組織…61
4-5 結論……………………………………………………………………64
五.以NICROBRAZ－L.M.為硬銲填料之Fe-28Al紅外線硬銲接合與其接合介面之研究……………………………………………………………………86
5-1鎳基硬銲填料…………………………………………………………86
5-2以NICROBRAZ－L.M.為填料於Fe-28Al基材的紅外線硬銲之接合介面組
織……………………………………………………………………………89
5-3紅外線硬銲接合介面之微硬度分析…………………………………97
5-4結論……………………………………………………………………97
六.總結……………………………………………………………………117
參考文獻…………………………………………………………………120

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