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Interfacial Characterization of Mosi2+ X Sic Composite Thin Films on Molybdenum Substrates

Published online by Cambridge University Press:  10 February 2011

S. Govindarajan ,
J. J. Moore ,
T. R. Ohno  and
J. Disam
S. Govindarajan
Affiliation:
Department of Metallurgical & Materials Engineering, Colorado School of Mines, Golden, CO-80401
J. J. Moore
Affiliation:
Department of Metallurgical & Materials Engineering, Colorado School of Mines, Golden, CO-80401
T. R. Ohno
Affiliation:
Department of Physics, Colorado School of Mines, Golden, CO - 80401
J. Disam
Affiliation:
Schott Glaswerke, Mainz, Germany.
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Abstract

A novel coating architecture is being examined for enhancing the high temperature, oxidation resistance of molybdenum. The coating incorporates a thin, composite film of MoSi2+1.96 mole fraction SiC in order to match the coefficients of thermal expansion between the molybdenum substrate and the coating. Since the as-deposited composite film is amorphous in nature, a diffusion anneal treatment is carried out at 1000°C to achieve crystallization of the film. In this paper, a detailed examination of the Mo-MoSi2+1.96 SiC interface will be presented. The microstructural features of the composite films will be discussed based on electron microscopy, auger electron spectroscopy (AES), and X-ray diffraction analysis. Finally, a novel diffusion barrier layer for minimizing silicon and carbon diffusion from the coating to the substrate will be discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 458: Symposium W – Interfacial Engineering for Optimized Properties , 1996 , 489
Copyright
Copyright © Materials Research Society 1997

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References

REFERENCES

1. Krier, C.A., “Coatings for the Protection of Refractory Metals from Oxidation”, DMIC Report No. 162, November 24, 1961.Google Scholar
2. Govindarajan, S. et al., “The protection of molybdenum electrodes against oxidation/corrosion in glass melting furnaces”, Report No. MT-EXT-092–038, Colorado School of Mines, December 1992.Google Scholar
3. Govindarajan, S, Moore, JJ, Mishra, B, Olson, DL, Ohno, TR, and Disam, J, “On the possibility of tailoring a compositional gradient in thin films sputtered from a MoSi2 + X SiC composite target”, Presented at ICMCTF '96, April 22–26, 1996, San Diego; (to be published in Surface & Coatings Technology).Google Scholar
4. Govindarajan, S, Moore, JJ, Levashov, EA, Mishra, B, Ohno, TR and Olson, DL, “Composite thin films produced using physical vapor deposition of composite targets”, Symposium on Processing and Fabrication of Advanced Materials IV, Materials Week '95, Cleveland, OH, Oct 30-Nov 2, 1995.Google Scholar
5. Govindarajan, S, Feng, HJ, Moore, JJ, and Levashov, EA, “Reactive synthesis of composite targets used in physical vapor deposition of thin films”, Symposium on Processing and Fabrication of Advanced Materials IV, Materials Week '95, Cleveland, OH, Oct 30-Nov 2, 1995.Google Scholar
6. Fitzer, E. and Schmidt, F.K., High Temperature High Pressure, 3, 1971, p. 445.Google Scholar
7. Hirvonen, J.P. et al., Mechanical Properties and Deformation Behavior of Materials Having Ultra-fine Microstructures, eds. Nastasi, M. et al., Kluwer Academic Publishers, p. 469, 1993.Google Scholar
8. Mitchell, T.E. et al., Novel Techniques in Synthesis and Processing of Advanced Materials, eds. Singh, J. and Copley, S., TMS Warrendale, PA, presented at Materials Week '94, Rosemont, Illinois, Oct. 2–6, 1994.Google Scholar
9. Kung, H. et al., Mat. Res. Soc. Symp. Proc., 322, p. 27, 1994.Google Scholar
10. Hirvonen, J.P. et al., High Temperature Suicides and Refractory Alloys, eds. Briant, C.L. et al., MRS, Pittsburgh, PA, p. 279, 1993.Google Scholar