利用BAg-8填料紅外線硬銲接合Ti-6Al-4V與17-4PH之研究

The study of infrared brazing Ti-6Al-4V and 17-4 PH using the BAg-8 filler

王誠佑(Cheng-Yu Wang)

指導教授 ： 吳錫侃

國立臺灣大學/工學院/材料科學與工程學研究所/碩士(2004年)

https://doi.org/10.6342/NTU.2004.10045

摘要

本研究以紅外線加熱法，使用50μm厚之Ag基填料BAg-8來硬銲接合Ti-6Al-4V鈦合金及17-4 PH不鏽鋼(S.S.)。硬銲接合前分別對Ti-6Al-4V及17-4 PH進行表面處理，以鍍膜作為擴散阻隔層，期能阻擋填料與基材形成硬脆的介金屬相，以得到最佳剪力強度之條件。實驗結果顯示，在17-4 PH S.S.表面鍍鎳與鉻膜，可得到的最佳接合剪力強度約為117 MPa；而在Ti-6Al-4V表面鍍鉻膜，可得到的最佳接合剪強度約為120 MPa。由破斷途徑之分析可得知，在17-4 PH不鏽鋼進行表面處理，破斷面主要為Ti2Cu介金屬相。而在Ti-6Al-4V進行表面處理，破斷面主要為Ti2Cu介金屬相或少數為(Ti, Cu, Fe)三元合金相。在擴散阻隔層較厚時，因擴散阻隔層的阻擋效果較強，未能形成硬脆的Ti-Cu介金屬化合物，因此破斷都發生於鍍膜與被鍍基材界面之間；若是擴散阻隔層較薄時，因生成較厚的Ti-Cu硬脆介金屬相，此時破斷則發生於Ti-Cu介金屬化合物與基材界面之間。

關鍵字

Ti-6Al-4V/17-4PH不鏽鋼接合 ； Ni,Cr擴散阻隔層 ； 銀基填料 ； 紅外線硬銲接合 ； 界面顯微組織 ； 接合剪強度

並列摘要

Two kinds of dissimilar metals, Ti-6Al-4V and 17-4 PH stainless steel (S.S.), are joined by infrared vacuum brazing using BAg-8 filler metals with 50μm thickness. Before brazing, diffusion barrier coatings on Ti-6Al-4V or 17-4 PH S.S. are introduced. The aim of diffusion barriers is to prevent interdiffusion between two dissimilar metals from forming intermetallic compounds, and thus to get better shear strength. Experimental results show that Ni and Cr films coated on 17-4 PH S.S. can obtain the shear strength of 117 MPa, and Cr film coated on Ti-6Al-4V can obtain the shear strength of 120 MPa. By the SEM analysis of crack propagation, for surface coatings on 17-4 PH S.S., the specimens are fractured at the Ti2Cu intermetallic compound; and for surface coatings on Ti-6Al-4V, the specimens are fractured mostly at the Ti2Cu but few at the (Ti, Cu Fe) ternary alloy phases. As diffusion barriers are thick, the hard and brittle Ti-Cu intermetallic is not formed because the effect of diffusion barriers is significant. In this case, the crack takes place in between coating film and substrate. As diffusion barriers are thin, the hard and brittle Ti-Cu intermetallic is formed. Thus the crack takes place in between this brittle Ti-Cu intermetallic and the substrate.

並列關鍵字

Ti-6Al-4V/17-4 PH S.S. ； Ag-based filler metals ； Ni, Cr diffusion barrier ； Microstructures ； Infrared brazing ； Bonding strength

參考文獻

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