Thermodynamics And Kinetics Of Metal/ceramic Reactions: Relation With Wetting

Abstract:

Interfacial reactions between liquid metals and ceramics are of technological importance in many fields of materials engineering such as joining of ceramics by brazing alloys, manufacturing of metal/ceramic composites, casting of metals, etc.In non-reactive metal-ceramic systems non-wetting is usually observed. In these systems, wetting can be significantly improved by certain alloying elements which form continuous layers of compounds at the interface, by reaction with the ceramic substrate. Such reactions are used in practice to promote wetting, especially for joining of ceramics by brazing alloys. As this reactivity can affect the physical properties of the interface and especially the mechanical behaviour of the system, it is important to control the nature, morphology and microstructure of the reaction product.The purpose of this presentation is to focus on the fundamental issues of metal/ceramic interfacial reactions and to analyse the main thermodynamic and kinetic factors governing these reactions. In particular, some physicochemical aspects which can affect, or even control, the morphological evolution of the interfacial region will be discussed by using and analysing different examples of interactions between oxide or non-oxide ceramics and reactive liquid alloys.

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