鈦基非晶填料應用於Ti-6Al-4V合金硬焊之微結構及機械性能研究

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賴承孝(CHENG-HSIAO LAI) 查詢紙本館藏

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機械工程學系在職專班

論文名稱

鈦基非晶填料應用於Ti-6Al-4V合金硬焊之微結構及機械性能研究
(Interfacial microstructure and shear strength of Ti-6Al-4V alloy joints vacuum brazed with Ti-based amorphous filler)

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摘要(中)

本研究係使用本實驗室開發之Ti42Zr35Ta3Si5Sn2.5Co12.5無毒性、生物相容性佳鈦基非晶粉末，作為Ti-6Al-4V的硬焊填料進行真空硬焊。本研究分別進行了1000℃、1050℃及1100℃不同溫度的真空硬焊，可發現本非晶填料之黏度相當高，不利毛細作用將熔融填料滲入接合間隙，但使用夾心式的填料方式可得到良好的接合表面。拉伸試驗結果發現剪力強度與溫度呈正相關，在1100℃持溫45分鐘的條件下可得到最佳的剪力強度170MPa。在金相及SEM/EDS分析的部分可發現1050℃時焊道與母材之間有明顯的反應層，且組織係由α-Ti、β-Ti及Ti基介金屬化合物所組成，而1100℃下基本上皆已看不到反應層，可看到粗大的β-Ti晶界上析出針狀的α-Ti。破斷面的部分可觀察到皆為窩穴狀的韌性破斷，並無因介金屬化合物析出而造成脆性破斷。

摘要(英)

Ti42Zr35Ta3Si5Sn2.5Co12.5 is a novel amorphous materials, which has non-toxic property and high biocompatibility in human body. In this research, this novel materials was used as the brazing filler for Ti-6Al-4V for vacuum brazing. Vacuum brazing was carried out at different temperatures of 1000 °C, 1050 °C and 1100 °C. It can be found that the viscosity of the molten amorphous filler is quite high, which is difficult for capillary action to penetrate into the joint clearance. However, a good joint can be obtained by using a sandwich-type filling method. The tensile test results show that the shear strength is positively correlated with the temperature, and the best shear strength of 170MPa can be obtained at 1100℃ for 45 minutes. It can be found that there is an obvious reaction layer between the weld bead and the base metal at 1050 ℃, and the microstructure is composed of α-Ti, β-Ti and Ti-based intermetallic compounds. While 1100℃, needle-like α-Ti could be found on the coarse β-Ti grain boundary. All the ductile fractures in the shape of dimple can be observed in the fractured surface, and there is no brittle fracture caused by the precipitation of intermetallic compounds.

關鍵字(中)

★ 鈦基合金
★ 非晶填料
★ 真空硬焊
★ 顯微組織

關鍵字(英)

★ Ti-based alloy
★ Amorphous filler
★ Vacuum brazing
★ Microstructure

論文目次

目錄
摘要 I
ABSTRACT II
誌謝 III
目錄 IV
圖目錄 VII
表目錄 X
第一章緒論 1
1-1 前言 1
1-2 研究動機及目的 3
第二章理論基礎與概論 4
2-1 金屬玻璃 4
2-1-1 金屬玻璃實驗歸納法則 5
2-1-2 玻璃形成能力(Glass forming ability, GFA) 6
2-1-3 金屬玻璃製程 8
2-1-4 金屬玻璃的特性 10
2-2 硬焊 (Brazing) 12
2-2-1 影響硬焊品質的因子 12
2-2-2 硬焊接頭的缺陷 16
2-3 非晶填料於硬焊之應用與研究 17
第三章實驗設備、材料及方法 25
3-1 實驗目的及流程 25
3-2 非晶填料製備 25
3-2-1 合金錠製備 25
3-2-2 非晶金屬粉末製備 26
3-3 硬焊之鋪展性/拉伸試片製備 26
3-4 試驗結果分析 27
3-4-1 晶格結構分析 27
3-4-2 熱性質分析 27
3-4-3 鋪展性分析 28
3-4-4 拉力試驗分析 29
3-4-5 微結構分析 29
第四章實驗結果與討論 41
4-1 晶格結構分析 41
4-2 熱性質分析 41
4-3 非晶填料鋪展性 41
4-4 剪力強度分析 44
4-5 微結構分析 44
4-5-1 OM金相分析 45
4-5-2 SEM/EDS分析 46
4-5-3 SEM破斷面分析 47
第五章結論 68
第六章參考文獻 70

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指導教授

鄭憲清(SHIAN-CHING JANG)

審核日期

2022-7-20

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