Metallurgical Transactions B

, Volume 16, Issue 3, pp 567–575 | Cite as

Interfacial phenomena between molten metals and sapphire substrate

  • S. P. Mehrotra
  • A. C. D. Chaklader
Article
Received:

Abstract

Interfacial energies and contact angles for liquid Cu-sapphire and liquid Ag-sapphire systems as a function of O2 partial pressure were experimentally determined using the sessile drop technique. For very low values of Po2the variation of γlg is small, but at Po2, values high enough to establish a monolayer on the liquid metal, γlg decreases linearly with increasing logP o2. The slope of this line is related to the surface concentration of oxygen through Gibb's absorption equation. For various metal-sapphire systems, γlg is found to be a cosine function of the contact angle (θ) whereas γsl seems to be a linear function of (θ). A theoretical model has been developed to predict this behavior. One empirical constant relating to the free energy of formation of an interfacial compound was employed. The validity of the model has been tested for the Cu, Ag, Fe, and Ni-sapphire systems. The model has also been used to predict the effect ofP o2on the interfacial energies and contact angle for the Co-sapphire system.

Keywords

Contact Angle Metallurgical Transaction Oxygen Partial Pressure Interfacial Energy Molten Metal 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Copyright information

© The Metallurgical Society of AIME 1985

Authors and Affiliations

  • S. P. Mehrotra
    • 1
  • A. C. D. Chaklader
    • 2
  1. 1.Department of Metallurgical EngineeringIndian Institute of TechnologyKanpurIndia
  2. 2.Metallurgical Engineering DepartmentThe University of British ColumbiaVancouverCanada

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