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Thermomechanical representation of the stored energy during plastic deformation

Dedicated to Professor Dr. Hermann Riedel on the occasion of his 65th birthday
Published/Copyright: May 31, 2013

Abstract

Reactive air brazing offers economically and technologically advantageous joining of ceramics to metals. Solid oxide fuel cells and membranes for oxyfuel combustion are recent fields of application. However, it remains a problem that strong metallurgical reactions between brazes and base materials occur. These reactions were analysed by differential scanning calorimetry tests to get a better understanding. Therefore, three braze alloys (Ag8Cu, Ag8Cu0.5Ti and Ag4Cu4Ni) and five base materials (alumina, 3YSZ partially stabilised zirconia, BSCF perovskite ceramic, X1CrTiLa22 and X15CrNiSi25-20) were investigated. The reaction peaks correlate with the formation of reaction layers, which were observed in metallographic analysis of brazed specimens. The results help to explain the reaction mechanisms and allow optimised selection of filler metals and brazing temperature.


* Correspondence address, Dipl.-Ing. Nils Kopp, RWTH Aachen University, IOT – Surface Engineering Institute, 52056 Aachen, Germany, Tel.: +49(0)241-80 999 60, Fax: +49(0)241-80 929 41. E-mail:

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Received: 2010-3-5
Accepted: 2010-5-28
Published Online: 2013-05-31
Published in Print: 2010-08-01

© 2010, Carl Hanser Verlag, München

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