Influence of Oxygen Partial Pressure and Oxygen Content on the Wettability in the Copper–Oxygen–Alumina System |
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| Authors: | Matthias Diemer Achim Neubrand Kevin P Trumble Jürgen Rödel |
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| Affiliation: | Ceramics Group, Department of Materials Science, Darmstadt University of Technology, 64287 Darmstadt, Germany;School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907–1289 |
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| Abstract: | The influence of oxygen on the wetting behavior of copper on single-crystal Al2O3 has been studied. By controlling the oxygen partial pressure ( p O2) and oxygen content in the copper simultaneously, contact angle can be varied between 125° and 22°. Evaluation of the Gibbs adsorption equation for the liquid/solid interface at 1300°C suggests that adsorption of a Cu-O complex at that interface plays a key role in promoting wetting. Formation of CuAlO2 and dissolution of Al2O3 in the melt also influence the contact angle, especially in the range of p O2 > 10?5 bar (1 Pa). |
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