紅外線硬銲接合Ti-6Al-4V與異質合金之研究

The Study of Infrared Brazing Ti-6Al-4V and Dissimilar Alloys

薛鈞尹(Jun-Yin Shiue)

指導教授 ： 吳錫侃

共同指導教授 ： 薛人愷(Ren-Kae Shiue)

國立臺灣大學/工學院/材料科學與工程學研究所/碩士(2007年)

https://doi.org/10.6342/NTU.2007.00209

摘要

本研究中嘗試接合Ti-6Al-4V(Ti-64)與其它異種金屬。研究中使用Ag-Cu-1.75Ti填料接合Ti50Ni50合金時，於Ti50Ni50端會出現CuNiTi相及Ti3Cu4相。隨著硬銲時間與溫度的增加，銲道中會生成AlCu2Ti相。而Ti-64端主要的反應相為Ti2Cu、TiCu、Ti3Cu4及TiCu4相。改以Ag-Cu-4.5Ti填料接合時之相演化類似，但由於Ti-Cu介金屬層增厚，剪力值下降且較不穩定。使用BAg-8填料接合鍍Cr、Ni的17-4PH不鏽鋼，於Ti-64端的相演化與前述相似，而17-4PH端的Ni膜消失，Ni元素溶入銲道產生反應，可發現CuNiTi相。使用Ag-Cu-1.75Ti填料接合鍍Cr的17-4PH時，則會於17-4PH端生成TiCr2相，此不利於接點之剪力測試強度。此外，實驗中亦發現鍍有Ni膜時會大幅增進填料潤溼性而使剪力測試數值穩定。使用60Ti-15Cu-25Ni填料接合Ti50Al50合金時，於Ti-64端出現一相當厚的Ti rich相，於Ti50Al50端則有α2-Ti3Al和γ-TiAl的固溶區及連續α2-Ti3Al反應相層，中間的殘留填料區主要為Ti2Cu/Ti2Ni相。改以70Ti-15Cu-15Ni填料接合時相基材兩側生成相相似，而銲道中的殘留填料區較少。使用40Ti-20Zr-20Cu-20Ni填料接合時，由於有Zr元素的參與，兩側基材處的相演化過程產生變化，且銲道中的殘留填料區至少有3種以上不同的相而有待後續的研究。

關鍵字

紅外線硬銲接合 ； Ti-6Al-4V ； 銀基填料 ； 鈦基填料 ； 擴散阻隔層

並列摘要

This research is focused in infrared vacuum brazing Ti-6Al-4V (Ti-64) and other alloys. For the brazed Ti-64 and Ti50Ni50 joint using the Ag-Cu-1.75Ti filler, CuNiTi and Ti3Cu4 are formed adjacent to the Ti50Ni50 substrate, and AlCu2Ti is observed with increasing the brazing time and/or temperature. Ti2Cu, TiCu, Ti3Cu4 and TiCu4 are found nearby the Ti-64 substrate. The microstructural evolution of the joint using the Ag-Cu- 4.5Ti filler is similar to that of Ag-Cu-1.75Ti filler except for thicker Ti-Cu intermetallics. For the brazed Ti-64 and 17-4PH stainless steel (17-4 PH SS) with Cr/Ni coatings joint using the BAg-8 filler, the microstructure of Ti-64 side is similar to the aforementioned result. For the 17-4PH SS side, the Ni film is disappeared and dissolved into the braze resulting in the CuNiTi phase. It is found that introducing a thin layer of Ni film greatly improves the wettibility of the molten braze on the 17-4PH SS, so shear strengths of joints are more stable. For the use of Ag-Cu-1.75Ti filler to braze 17-4PH SS coated with Cr film, TiCr2 is formed next to the 17-4PH SS, and it impairs shear strength of the brazed joint. For the use of 60Ti-15Cu-25Ni filler to braze Ti50Al50 alloy, two layers are formed: one layer composed of α2-Ti3Al and γ-TiAl mixtures and the other having a continuous α2-Ti3Al phase. The residual filler in the brazed zone is composed of Ti2Cu and Ti2Ni. For 70Ti-15Cu-15Ni filler, the microstructural evolution of the joint is very similar to that of 60Ti-15Cu- 25Ni filler except for the decreased residual filler zone. The phase evolution of the joint brazed by 40Ti-20Zr-20Cu- 20Ni filler is changed because of introducing Zr, and there are at least three different phases formed in the residual filler zone.

並列關鍵字

Infrared brazing ； Ti-6Al-4V ； Ag-based filler ； Ti-based filler ； diffusion barriers

參考文獻

115. 薛人豪, ” 鈦鎳形狀記憶合金紅外線硬銲接合之研究 ”, 國立臺灣大學材料科學與工程學研究所博士論文,中華民國95年6月.

1. T. Tetsui, Intermetallics, 9 (2001) 253.

12. K. S. Raja and K. Prasad Rao, Mater. Sci. Lett., 12 (1993) 963.

13. K. S. Raja and K. Prasad Rao, Mater. Sci. Lett., 29 (1993) 957.

15. T. B. Massalski, Binary Alloy Phase Diagrams, (ASM International, Metals Park, 1990).