SEM investigation of interfaces after simultaneous contact of Cu-۲۰Ti and Cu melts with zirconia ceramic

The interfaces for a cooled sample after simultaneous contact of the adhesively active copper-titanium melt and of inert copper melt with ZrO۲-ceramic (Cu-۲۰Ti / ZrO۲ / Cu system) were investigated using SEM analysis. The copper-titanium / zirconia interface zone has a multilayer structure with the arrangement of phases: copper-titanium alloy / copper-titanium intermetallics / oxidized titanium / zirconia. In the surface layers of the ceramics there are inclusions of a phase rich in copper and titanium, which is a sign of infiltration. The distribution of zirconium in the ceramic near the interface is uneven. Such developed structures of interface zones were not observed in other works where the interaction of metal melts containing titanium with zirconia was studied. The copper / zirconia interface zone is characterized by a fairly clear boundary, although there are visible signs of dissolution of ceramics in the metal. The described features are explained by the mutual influence of processes at the interfaces: the copper-titanium melt dissolves oxygen from zirconia, resulting in the formation of a non-stoichiometric phase, where the oxygen deficiency can be considered as an “surplus” of zirconium. “Surplus” zirconium dissolves in copper, as a result, the stoichiometry of zirconia is restored, and the copper-titanium melt absorbs more oxygen, therefore a complex structure of the interface zone is formed.

کلیدواژه ها:

Wetting ، contact interaction ، Zirconia ، metal melts ، interface