caa a22 4500 388021411 CHVBK 20180307124925.0 cr unu---uuuuu 161130e199802 xx s 000 0 eng 10.1557/JMR.1998.0046 doi S0884291400042837 pii (NATIONALLICENCE)cambridge-10.1557/JMR.1998.0046 Metallurgical reactions controlling the brazing of Al2O3 with Ag-Cu-Ti filler alloys [Elektronische Daten] 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. Copyright © Materials Research Society 1998 Paulasto M. Helsinki University of Technology, Department of Materials Science and Engineering, FIN-02150 Espoo, Finland Kivilahti J. Helsinki University of Technology, Department of Materials Science and Engineering, FIN-02150 Espoo, Finland Journal of Materials Research Cambridge University Press 13/2(1998-02), 343-352 0884-2914 13:2<343 1998 13 JMR https://doi.org/10.1557/JMR.1998.0046 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1557/JMR.1998.0046 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Paulasto M. Helsinki University of Technology, Department of Materials Science and Engineering, FIN-02150 Espoo, Finland NATIONALLICENCE 700 1- Kivilahti J. Helsinki University of Technology, Department of Materials Science and Engineering, FIN-02150 Espoo, Finland NATIONALLICENCE 773 0- Journal of Materials Research Cambridge University Press 13/2(1998-02), 343-352 0884-2914 13:2<343 1998 13 JMR CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge