This presentation will be mainly focused on the following points:
(i) Thermodynamics analysis of non-reactive and reactive brazing and relationship between wettability and brazability.
(ii) The crucial role of geometrical confinement in brazing which can lead to a major difference between interfaces obtained in sessile drop and brazing experiments.
(iii) The role of size effect in the evolution of interfacial system in reactive brazing, which involves particularly low values of braze alloy volume per unit area of reactive interface.
All these points will be illustrated by analysis of results obtained in sessile drop and brazing experiments in metal/ceramic and glass/ceramic systems.