Study on vacuum brazing of high purity alumina for application in proton synchrotron
Study on vacuum brazing of high purity alumina for application in proton synchrotron
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DOI：
10.1016/j.matdes.2014.07.069
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发表时间：
2014-12
影响因子：
8.4
通讯作者：
D. Yadav;R. Kaul;P. Ganesh;R. Shiroman;R. Sridhar;L. M. Kukreja
中科院分区：
文献类型：
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作者：
D. Yadav;R. Kaul;P. Ganesh;R. Shiroman;R. Sridhar;L. M. Kukreja
本文介绍了用两种不同的真空钎焊工艺获得适用于快循环质子同步加速器的高纯氧化铝(99.7%)接头的试验研究。Al_2O_3-Al_2O_3钎焊采用两种不同的钎焊方法：(I)多步Mo-Mn金属化，然后用BVAg-8合金进行钎焊；(Ii)用CuSil-ABA®合金进行先进的单步活性钎焊。这两条铜焊路线都产生了氦不泄漏和超高真空(压力为10−9mbar)兼容的接头。活性钎焊试件的抗拉强度和平均弯曲强度分别为62和110 Mpa。尽管金属化钎焊试件的抗拉强度(35 Mpa)低于目标值(>；50 Mpa)，但其平均弯曲强度却较高，为149 Mpa。研究结果表明，对于生产高纯氧化铝快速循环质子同步加速器用的高纯氧化铝接头而言，活性钎焊是一种简单且经济有效的替代传统的多步金属化方法。
The paper describes an experimental study to evaluate two different vacuum brazing processes to obtain high purity alumina (99.7%) joints suitable for application in rapid cycle proton synchrotron. Two different brazing routes, adopted for making alumina–alumina brazed joints, included (i) multi-step Mo–Mn metallization, followed by brazing with BVAg-8 alloy and (ii) advanced single-step active brazing with CuSil-ABA® alloy. Both the brazing routes yielded helium leak tight and ultra-high vacuum (pressure < 10−9mbar) compatible joints. Active-brazed specimens exhibited tensile and mean flexural strengths of 62 and 110 MPa, respectively. Metallized-brazed specimens, although associated with relatively lower tensile strength (35 MPa) than the targeted value (>50 MPa), displayed higher mean flexural strength of 149 MPa. The results of the study demonstrated that active brazing is a simple and cost effective alternative to conventional multi-step metallization route for producing quality joints of high purity alumina for application in rapid cycle proton synchrotron machine.