臺灣博碩士論文加值系統

本研究利用紅外線快速加熱，以純Ag、純Cu及BAg-8(Ag-Cu共晶)三種填料硬銲接合Fe3Al介金屬，填料熔液與基材元素於硬銲時交互擴散劇烈。以純Ag填料於980℃硬銲，銲道中僅有固溶Al之富Ag相，顯微組織及接合強度不隨持溫時間而有明顯改變，破壞形式為銲道中富Ag相之延性破斷，剪力強度可達約127MPa。以純Cu填料於1100℃硬銲，持溫時間對於顯微組織及接合強度均有很大影響，銲道基底隨持溫時間之增長，由固溶大量Al之富Cu相轉為β1’麻田散體相，因此接合強度先增後減，破壞形式也由延性逐漸增加脆性比例，其最大剪力強度可達291MPa。以BAg-8填料硬銲之顯微組織，持溫時間及溫度對其銲道組織不會有所影響，均為富Ag相及富Cu相所組成之共晶組織，持溫時間之增長可增加富Cu相中Al含量，因此接合強度亦隨之增加，破壞形式均為銲道凝固組織之延性破壞，其最大剪力強度可達181MPa。另外，本研究探討各種銀基合金填料對304、422及440C三種不�袗�基材，藉由紅外線加熱之動態潤濕角量測瞭解其潤濕特性，並對其顯微組織進行生成相分析，發現Sn元素可降低Ag-Cu填料之熔點，但對於潤濕性幫助不大，因此再添加Mn元素使得填料可增加對不�袗�之潤濕性，最後發現Ag-Cu-Sn-10wt.%Mn之填料合金的確可有效潤濕不�袗�基材。顯微組織則由Ag-Cu-Sn填料有的界面抗蝕性劣化相(損失Ni及Cr之富Fe相)及填料區複雜凝固相，隨著Mn添加量的增多，除了界面相消失，填料區中複雜的富Cu之相(Cu3Sn、Cu4MnSn及富Cu相)也逐漸單一化並析出許多富Ag相於其中，最後成為沒有明顯介金屬相之富Ag及富Cu兩相混合相。

Microstructural evolution and bonding strength of infrared brazed Fe3Al using Ag, Cu, and BAg-8 braze alloys have been studied. The joint of the Ag-brazed specimen only contains Ag-rich phase alloyed with Al. The shear strength isn’t affected by the brazing time and reaches 127MPa for specimens brazed at 980oC×300s with the ductile fracture of Ag-rich phase. The microstructure and shear strength of infrared brazed Fe3Al using pure Cu at 1100oC are strongly dependent upon the brazing time in which the brazed joint changes from Cu-rich phase into β1’ (N18R) martensite phase, and causes different fracture mechanism and bonding strength. The highest shear strength reachs 291MPa for the specimen brazed at 1100℃×300s with the mixture of brittle and ductile phases in the joint. The microstructure of the Fe3Al joint brazed by BAg-8 contains Ag-rich and Cu-rich phases eutectic for all brazing conditions. The shear strength increases slightly with increasing the brazing time because the Al is alloyed in the Cu-rich matrix. The highest shear strength of 181MPa is acquired from the 800℃×600s brazed specimen. The analyses of dynamic wetting angles and microstructures of Ag-based braze alloys on 304, 422 and 440C substrates are performed. Experimental results shows that Sn added into Ag-Cu braze alloy can reduce its melting point effectively but can not improve its wettability for stainless steel. The Ag-Cu-Sn braze alloy with adding Mn can reduce the wetting angle on stainless steel. The more the Mn content , the better the wettability it has. The best wettability is the Ag-Cu-Sn-10wt.%Mn alloy and its microstructure after wetting tests consistsd of Ag-rich and copper-rich phases. Meanwhile, increasing the Mn content results in the copper-rich phases in the braze changing from complex phases (Cu3Sn, Cu4MnSn, Cu-rich phases) into single Cu-rich phase with many Ag-rich precipitates.

口試委員會審定書 i
誌謝 ii
中文摘要 iii
英文摘要 iv
目錄 v
第一章前言 1
第二章文獻回顧 3
2-1合金機械性質 3
2-1-1Fe3Al介金屬 3
2-1-2不�袗� 4
2-2合金接合研究 5
2-2-1硬銲接合 5
2-2-2潤濕特性 6
2-2-3鐵鋁介金屬之接合 7
2-2-4不�袗�之接合 8
2-3硬銲填料 9
2-3-1 Ag-Cu共晶填料 10
2-3-2新型銀基硬銲填料 10
2-4紅外線硬銲接合製程 11
2-4-1紅外線加熱原理 11
2-4-2接合製程 12
第三章實驗方法 25
3-1硬銲基材之試片準備 25
3-1-1 Fe3Al介金屬 25
3-1-2不�袗� 25
3-2硬銲填料之製備與準備 25
3-2-1商用填料 25
3-2-2新型填料 26
3-2-3潤濕試驗準備 26
3-3紅外線硬銲接合製程 26
3-3-1實驗設備 26
3-3-2硬銲接合實驗 27
3-3-3動態潤濕角量測 27
3-3-4加熱參數控制 28
3-4紅外線硬銲接合分析 28
3-4-1電子顯微鏡與化學成分分析 28
3-4-2分析前處理 29
3-4-3剪力試驗 29
3-4-4 X-ray繞射結構分析29
3-5實驗流程 30
第四章Ag/Cu填料紅外線硬銲接合Fe3Al之研究 37
4-1不同填料對Fe3Al基材之潤濕性分析 37
4-2使用純Ag填料紅外線硬銲接合Fe3Al介金屬 38
4-3使用純Cu填料紅外線硬銲接合Fe3Al介金屬 41
4-4使用BAg-8填料紅外線硬銲接合Fe3Al介金屬 45
4-5三種填料紅外線硬銲接合Fe3Al介金屬之機械性質分析 46
4-5-1使用純Ag填料紅外線硬銲接合Fe3Al介金屬之機械性質分析 47
4-5-2使用純Cu填料紅外線硬銲接合Fe3Al介金屬之機械性質分析 47
4-5-3使用BAg-8填料紅外線硬銲接合Fe3Al介金屬之機械性質分析 50
4-6本章結論 50
第五章銀基填料紅外線硬銲接合不�袗�之動態潤濕角分析
5-1 Ag-Cu共晶填料對304不�袗�之潤濕性分析 83
5-1-1動態潤濕角分析 83
5-1-2潤濕界面顯微組織分析 84
5-2 AgCuSn合金對304不�袗�之潤濕性分析 84
5-2-1動態潤濕角分析 84
5-2-2潤濕界面顯微組織分析 85
5-3 CuMn合金對304不�袗�之潤濕性分析 86
5-3-1動態潤濕角分析 86
5-3-2潤濕界面顯微組織分析 87
5-4 AgCuMn合金對304不�袗�之潤濕性分析 87
5-4-1動態潤濕角分析 88
5-4-2潤濕界面顯微組織分析 88
5-5 AgCuSnMn合金對304不�袗�之潤濕性分析 89
5-5-1動態潤濕角分析 89
5-5-2潤濕界面顯微組織分析 89
5-6合金元素對潤濕性之影響 90
5-6-1添加Sn元素 90
5-6-2添加Mn元素 91
5-7 CuMn及AgCuSnMn合金對422及440C不�袗�之潤濕性分析 92
5-7-1動態潤濕分析 92
5-7-2潤濕界面顯微組織分析 93
5-8本章結論 94
第六章結論 127
參考文獻 129

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