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Metallurgical reactions controlling the brazing of Al2O3 with Ag–Cu–Ti filler alloys

Published online by Cambridge University Press:  31 January 2011

M. Paulasto  and
J. Kivilahti
M. Paulasto
Affiliation:
Helsinki University of Technology, Department of Materials Science and Engineering, FIN-02150 Espoo, Finland
J. Kivilahti
Affiliation:
Helsinki University of Technology, Department of Materials Science and Engineering, FIN-02150 Espoo, Finland
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Extract

Metallurgical reactions controlling the Ti activation in brazing of Al2O3 have been studied by means of microstructural and thermodynamic analysis. The reactions of titanium with oxygen and copper are shown to be decisive in active brazing. Themiscibility gap in the Ag–Cu–Ti system divides the liquid braze into Ag-rich (L1) and TiCu-rich (L2) liquids. The liquid L2 reacts with alumina forming the mixed oxide (Ti, Al)4Cu2O. Besides with alumina, Ti reacts with oxygen that the filler alloys usually contain and forms a brittle ribbon composed of TixO and Ti–Cu–O phases in the braze. The formation of Ti oxides next to the alumina is possible only in the filler alloys of highest Ag content.

Type
Articles
Information
Journal of Materials Research , Volume 13 , Issue 2 , February 1998 , pp. 343 - 352
Copyright
Copyright © Materials Research Society 1998

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