Wettability of Ceramic Substrates by Silver Based Alloys

• Authors: Z. Weltsch , A. Lovas
• Languages of publication: EN

Abstracts

EN

The temperature dependence of wettability (wetting angle, Θp(T)) for Ag-based melts on graphite and Al_2O_3 substrates is compared. Typical alloying effects are found, as the Ag host metal is gradually replaced by various metallic elements. The essence of alloying lies in the change of the electron/atom (e/a) ratio. This ratio is also manifested in the shift of wetting angles on the same substrate. The effect is also supported by the calculations based on the rigid band model, and is also in qualitative agreement with the Hume-Rothery rules. Nevertheless, the effects are partially smeared by other (metallurgical) factors, like the interaction between the oxygen-alloying elements and by the graphite substrate-oxygen interaction. In contrast, such effects are not pronounced in the case of Al_2O_3 substrates. As a consequence, Θp(T) exhibits an opposite trend in the case of two substrates. Crossovers of the Θp(T) curves were often found. The positions of crossovers depend on the chemical character and concentration of solute atoms. Segregation and epitaxial texture formation after solidification were also observed in certain alloy drops, especially in high concentration range. This phenomenon is not yet explained in every detail.

Keywords

EN

68.08.Bc

Discipline

• 68.08.Bc: Wetting

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2013
• Volume: 124
• Issue: 1
• Pages: 78-87

Dates

published

2013-07

received

2012-12-11

Contributors

author

Z. Weltsch

• Budapest University of Technology and Economics, Department of Automobiles and Vehicle Manufacturing Stoczek u. 4, H-1111 Budapest, Hungary

author

A. Lovas

• Budapest University of Technology and Economics, Department of Automobiles and Vehicle Manufacturing Stoczek u. 4, H-1111 Budapest, Hungary

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Identifiers

DOI

10.12693/APhysPolA.124.78