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  4. № 39 2006
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Wetting of ferroelectric BaTiO3-ceramics by different pure metals and some alloys

† J.Naydich,
 
T.Sydorenko,
 
V.Poluyanska,
 
E.Garmash,
 
I.Pleskach
 

I. M. Frantsevich Institute for Problems of Materials Science of the NAS of Ukraine, Omeliana Pritsaka str.,3, Kyiv, 03142, Ukraine
Adhesion of Melts and Brazing of Materials - Kiev: Frantsevich Institute for Problems of Materials Science NASU, 2006, #39
http://www.materials.kiev.ua/article/112

Abstract

The wetting of perovskite ferroelectric BaTiO3-ceramics in vacuum by pure metals and some alloys, which contain the active component, in particular Cu-Sn-Ti melts, was investigated. Ti addition to Cu-Sn alloys increase the wettability strongly: contact angle drops from 136 degrees (for Cu-8,6 Sn) to ~20 degrees (for (Cu-8,6 Sn)- 25 Ti). The wetting of BaTiO3 in air medium by Ag-Cu-O melts at varied copper concentration at the temperature of silver melting was also investigated. The concentration of copper varied in the rang 0-17% (mas.). Increasing of copper concentration, and so increasing of oxygen concentration in melt lead to improvement of BaTiO3 wetting by Ag-Cu-O melts. It was established that brazing fillers on the base of Cu-Sn-Ti and Ag-Cu-O system may be used for the brazing of BaTiO3 (semiconducting ceramics in first case and ferroelectric - in last).


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