Functional ceramic materials with especial electrophysical properties as barium titanate are attracting much interest for their application (capacitor dielectrics, resistors, thermal sensors, etc.). The strong contact of ceramic to metal is necessary in many applications. Research of interface interaction and wetting of functional BaTiO₃ ceramics by the melting metals was carried out. Regularity of capillary processes and control methods of them are established for 2 conditions of barium titanate: ferroelectric (BaTiO₃ stoichiometric compound) and semiconductor (BaTiO_3-x structure with oxygen defect).

The wetting in the air of ferroelectric ceramics by Ag-Cu-O system was studied in this work. Furthermore, wetting processes of semiconducting BaTiO₃-ceramics by metals and alloys were studied in vacuum: 12 pure metals and some Ti-containing alloys (Cu-Sn-Ti, Cu-Ga-Ti, Ag-Cu-Ti). This investigation discovers that the majority of metals do not wet a surface of perovskite ceramics. Addition of chemically active component (Ti) to alloys leads to significant reduction in the contact angle for BaTiO₃. The microstructure of ceramics/metal contacting phases was researched.

The joining technology of BaTiO₃ ceramic with metals and method of coating plating with high adhesion were elaborated. The best methods of ceramic brazing and metallization base on using of active fillers in vacuum. So, standard Ag-Cu-Ti filler was used for ВаТіО₃-ceramic metallization and the uniform coating was obtained. For some application metallization and brazing of ferroelectric ВаТіО₃ may be preferable on the air. The metal-oxygen technology was used: mix of Ag and Cu (3 at. %) powders were painted on ceramic surface and samples were annealed at 890 °C on the air. In such conditions the solid silver powder and the eutectic liquid exists in Ag-Cu-O system. This liquid wets the ceramic and also provides the sintering of silver powder. Thus the uniform coating with strong adhesion to ceramic is forms.

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1. Brazing perovskite ceramics in pure oxygen atmosphere
2. Investigation of contact interaction of metal melts and non metal materials by high temperature X-ray diffraction method