Study on vacuum brazing of high purity alumina for application in proton synchrotron

•Study compares Mo–Mn metallization & active brazing routes for joining alumina.•Targeted application: UHV chamber of proton synchrotron.•Both kinds of joints were UHV compatible with helium leak rate 50MPa).•Active brazing is a simpler & economical route for joining high purity alumina. The...

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Bibliographic Details
Published in:Materials in engineering 2014-12, Vol.64, p.415-422
Main Authors: Yadav, D.P., Kaul, R., Ganesh, P., Shiroman, Ram, Sridhar, R., Kukreja, L.M.
Format: Article
Language:English
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Summary:•Study compares Mo–Mn metallization & active brazing routes for joining alumina.•Targeted application: UHV chamber of proton synchrotron.•Both kinds of joints were UHV compatible with helium leak rate 50MPa).•Active brazing is a simpler & economical route for joining high purity alumina. 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 (pressure50MPa), displayed higher mean flexural strength of 149MPa. 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.
ISSN:0261-3069
DOI:10.1016/j.matdes.2014.07.069