難熔金屬硬銲之研究

The Study of Brazing Refractory Metals

陳宇翔(Yu-Cheung Chan)

指導教授 ： 薛人愷

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.2007.01780

摘要

本研究主要是以鈦基、金基和銀基填料，真空硬銲接合難熔金屬鎢（tungsten）與鉭(tantalum)。經由接合界面顯微組織分析及三點彎曲試驗可知，利用Ti35Ni25Nb填料硬銲接合，接合處主要是形成TiNi相、Ti2Ni相、Ni-Ta-Ti介金屬相與Ta-rich相；以1350℃持溫600s的試片進行三點彎曲試驗，所得到最高強度值為625MPa，最低強度值為530MPa，平均強度值為586Mpa，而試片表面的破裂型態以劈裂(cleavage)為主。以Ti50Ni填料硬銲接合，接合處主要是形成Ta-rich相、Ni-Ta-Ti介金屬相、TiNi相與Ti2Ni相；以1320℃持溫180s的試片進行三點彎曲試驗，其最高強度值為726MPa，最低強度值為542MPa，平均強度值為615MPa，破裂型態以劈裂為主。以金基填料70Au22Ni8Pd硬銲接合，接合處主要是形成Au-rich相、Au-Ni-Pd-Ta介金屬相、Ni-rich相、Au2Ta3相與Au-Ni-Ta相；1040℃持溫180s的試片進行三點彎曲試驗，其最高強度值為454MPa，最低強度值為303MPa，平均強度值為393MPa，破破裂型態以劈裂為主。利用Ag26.7Cu4.5Ti填料硬銲接合，接合處主要是形成TiCu相、TiCu4相、Ti3Cu4相、Ag-rich相與Cu-rich相；以880℃持溫300s的試片進行三點彎曲試驗，其最高強度值為582MPa，最低強度值為403MPa，平均強度值為496MPa，破裂型態以劈裂為主。綜合分析結果可發現，以鈦基填料Ti50Ni硬銲接合鎢與鉭，所得到的平均強度值最高，高達615MPa，為研究中最理想的硬銲結果。

關鍵字

硬銲 ； 三點彎曲試驗 ； 劈裂 ； 介金屬相

並列摘要

The brazing of tungsten and tantalum using Ti-base, Au-base and Ag-base braze alloys has been extensively studied. Based on the microstructural observation and three-point bending test results, the brazed joint using 40Ti-35Ni-25Nb braze alloy is primarily consists of TiNi, Ti2Ni, Ni-Ta-Ti intermetallics and Ta-rich phases. The specimen brazed at 1350℃ for 600s has the average strength of 586MPa, the highest strength of 625MPa and the lowest strength of 530MPa. Cleavage fracture is extensively observed for most fractured surfaces. For 50Ti-50Ni braze alloy, the brazed joint is primarily consists of Ta-rich, Ni-Ta-Ti, TiNi and Ti2Ni intermetallic phases. The specimen brazed at 1320℃ for 180s shows the average strength of 614MPa, the hightest strength of 725MPa and the lowest strength of 542MPa. Cleavage fracture is extensively observed for most fractrued surfaces. For the 70Au-22Ni-8Pd braze alloy, the brazed joint is mainly consists of Au-rich, Au-Ni-Pd-Ta, Ni-rich, Au2Ta3 and Au-Ni-Ta phases. The specimens brazed at 1040℃ for 180s exhibits the average strength of 393MPa, the highest strength of 454MPa and the lowest strength of 303MPa. Cleavage fracture is extensively observed for most fractured surfaces. For the 68.8Ag-26.7Cu-4.5Ti braze alloy, the braze joint is primarily consists of TiCu, TiCu4, Ti3Cu4, Ag-rich and Cu-rich phases. The specimes brazed at 880℃ for 300s exhibits the average strength of 496MPa, the highest strength of 582MPa and the lowest strength of 403MPa. Cleavage fracture is extensively observed for most fractured surfaces. Brazing tungsten and tantalum using the Ti50Ni50 brazing alloy demonstrates the highest average strength up to 615MPa.

並列關鍵字

brazing ； three-point bending test ； cleavage ； intermetallic

參考文獻

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