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Segregation of Silicon in Metal-Alumina Composites

Published online by Cambridge University Press:  02 July 2020

R.Y. Hashimoto ,
E.S.K. Menon  and
A.G. Fox
R.Y. Hashimoto
Affiliation:
Center for Mat. Sci. & Eng., Dept. of mech. Eng., Naval Postgraduate School, Monterey, CA93943
E.S.K. Menon
Affiliation:
Center for Mat. Sci. & Eng., Dept. of mech. Eng., Naval Postgraduate School, Monterey, CA93943
A.G. Fox
Affiliation:
Center for Mat. Sci. & Eng., Dept. of mech. Eng., Naval Postgraduate School, Monterey, CA93943
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Extract

A common impurity in polycrystalline commercial alumina is Si since silica is often added as a sintering aid. There have been several studies on impurities in alumina, and substantial degree of grain boundary segregation has been found to occur. Alumina-metal composites have found several applications especially in the electronic industry and consequently systems such as alumina-copper have been studied exhaustively. However, the role of impurities in metal-alumina composites has not been fully explored. Studies of Pt-alumina composites has shown that silicon is present at the interface of vacuum, diffusion bonded samples. Our earlier studies have shown that Si indeed segregates to the triple junctions and grain boundaries in alumina and in alumina-copper composites, often Si segregates to the metal-ceramic interfaces as well. This investigation concentrates on the distribution of silicon in copper-alumina in comparison to aluminum-alumina composites.

The metal-ceramic composites were prepared by diffusion bonding 99.99% pure metal foils sandwiched in between commercially available sintered alumina (∼99.5% pure) substrates for several hours in vacuum.

Type
Compositional Imaging and Spectroscopy
Information
Microscopy and Microanalysis , Volume 5 , Issue S2: Proceedings: Microscopy & Microanalysis '99, Microscopy Society of America 57th Annual Meeting, Microbeam Analysis Society 33rd Annual Meeting, Portland, Oregon August 1-5, 1999 , August 1999 , pp. 624 - 625
Copyright
Copyright © Microscopy Society of America

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