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  • Professor of the University of São Paulo – Lorena School of Engineering – EEL/USP
  • BSc in Chemical Engineering from the Lorena School of Chemical Engineering – FAENQUIL
  • MSc and PhD in Materials Engineering from the Lorena School of Chemical Engineering – FAENQUIL
  • Post-Doctoral degree from the Federal University of São Carlos
    Has worked in the area of ceramics, involving raw materials, processing and characterization, since 1998
  • Has been working in the area of wettability of ceramic systems since 2003
  • Acts as an advisor to science introduction, master’s and doctoral students in the area of ceramics
  • Has published 9 papers in international journals and 4 in national journals, and presented 15 papers at national congresses and one at an international congress, involving wettability of ceramic systems.

WETTABILITY: LIQUID-CERAMIC INTERFACE

Sebastião Ribeiro

Lorena School of Engineering SP

Abstract
Wettability is an important property of the solid-liquid interface. A given liquid will wet a solid surface to a greater or lesser extent provided the solid-liquid, solid-gas and liquid-gas interfacial energies are in proper thermodynamic balance, that is, if the G is lower than zero. This energy balance depends essentially on the chemical composition of the ambient air, the liquid and the solid; on the temperature; viscosity of the liquid, and on time. Based on the natural forces of attraction, the wetting of a surface may be physical or chemical, depending on the presence or absence of chemical reactions at the solid-liquid interface. Wetting phenomena are present in many areas of activity, for example, in ceramic processing and the flotation of minerals. In ceramic processing, this phenomenon occurs in the preparation of ceramic bodies, in liquid and viscous phase sintering, in infiltration, and in other processes. This lecture discusses the importance of wettability in our daily work routines in general, and from the technological standpoint in particular. We will therefore focus on the theoretical foundations of wettability, a review of the literature, applications in ceramic processing, and examples of specific cases, such as prediction of the wettability of given liquids in liquid phase sintering of ceramics and of the corrosion resistance of refractories by liquid slag.



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