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Alan W. Searcy, David V. Ragone, Umberto Colombo, editors, "Chemical and Mechanical Behaviour of Inorganic Materials" Wiley Interscience, New York/ London/ Sydney/ Toronto, 1970.

9.9 Wettability at high temperatures

Aim: to provide students with a basic understanding of non-reactive and reactive wetting phenomena at high temperatures, and to give the basic explanation of the wetting properties of dissimilar materials (metal/metal and metal/ceramic systems).

Topic description and teaching suggestions: Wetting of liquids on solids is a key aspect of many industrial processes (composite materials production, various coating processes, refining of steel, soldering and brazing processes, corrosion of solids by liquid metals, etc.) as well in laboratory preparations and property measurements. This is particularly true in materials processing at high temperatures. It is therefore important to have a scientific understanding of wetting behaviour both from theoretical models and experimental observations for example when liquid metals and/or inorganic glasses come in contact with solid metals or ceramics. It is important to know the nature of high-temperature wetting phenomena at materials interfaces in terms of properties such as capillarity, adhesion, adsorption and surface energies and, also, chemical reactions that alter the surfaces at interface. These phenomena occur for example when measuring some properties of a liquid in a metal or ceramic container (see the previous topic 5.2 dealing with experimental thermodynamics). Remember, as always, that “at high temperature everything reacts with everything else”. A prerequisite is the knowledge of basic interface chemistry, thermodynamics and kinetics.

N. Eustathopoulos, M.G.Nicholas, B. Drevet, “Wettability at high temperatures”, Pergamon Press, 1999, pp.437. This book in ten chapters is comprehensive and almost unique in treating high- temperature wetting phenomena

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