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CuAgNi钎料钎焊钨基粉末合金接头高温行为的研究
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1.吉林大学材料科学与工程学院;2.西北有色金属研究院

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吉林省科技发展计划资助(项目号20170204026GX)


Study on High Temperature Behavior of Tungsten-Based Powder Alloy Joints Brazed with CuAgNi Solder
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1.material science and Engineering School,Jilin University;2.Northwest Institute for Nonferrous Metal Research

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    摘要:

    采用OM、SEM和XRD观察了CuAgNi钎料及其钎焊钨基粉末合金接头的微观组织,对比研究了CuAg和CuAgNi钎料钎焊钨基粉末合金接头的高温剪切强度,进一步分析了CuAgNi钎料钎焊接头的热疲劳性能。研究表明:Ni对钎焊接头室温和高温下的剪切强度均有促进作用;接近室温(50℃)时,钎焊接头剪切强度为214.7MPa,比不添加Ni时增加了32.37%;400℃时,剪切强度为121.9MPa,比未添加Ni时增加了91.67%;且当温度超过300℃时,结合界面的氧化使接头的结合强度急剧下降。热疲劳试验中,随着热循环次数的增加,裂纹在α-Ag和β-Cu结合处萌生后逐步扩展,使接头剪切强度逐步降低。

    Abstract:

    The microstructure of CuAgNi filler metals and Tungsten-based powder alloy brazing joints has been observed by OM, SEM and XRD, to compare and analyze the high temperature shear strength of tungsten based powder alloy joints brazed with CuAg and CuAgNi filler metals, and the thermal fatigue properties of the brazed joints of CuAgNi brazed filler metal are further analyzed. It is investigated that Ni has promoted the shear strength of brazed joints at room temperature and high temperature. When the temperature is close to room temperature, the shear strength of the brazed joint is 214.7 MPa, which is 32.37% higher than that without Ni. At 400 °C, the shear strength is 121.9 MPa, which is 91.67% higher than that without Ni. Moreover, when the temperature is beyond 300 ° C, the oxidation of the bonding interface causes the bonding strength of the joint to drastically decrease. In the thermal fatigue test, as the number of thermal cycles increase, the cracks gradually expand after the initiation of α-Ag and β-Cu bonding, which gradually reduces the shear strength of the joint.

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卢裕臻,尚庆慧,邱小明,罗萃,邢飞. CuAgNi钎料钎焊钨基粉末合金接头高温行为的研究[J].稀有金属材料与工程,2019,48(8):2635~2639.[LuYuzhen, ShangQinghui, QiuXiaoming, LuoCui, XingFei. Study on High Temperature Behavior of Tungsten-Based Powder Alloy Joints Brazed with CuAgNi Solder[J]. Rare Metal Materials and Engineering,2019,48(8):2635~2639.]
DOI:10.12442/j. issn.1002-185X.20180794

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  • 收稿日期:2018-07-23
  • 最后修改日期:2018-08-10
  • 录用日期:2018-10-08
  • 在线发布日期: 2019-09-05
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