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Grain Structure and Growth of Dispersed Phase BN-AlN Coatings Grown via Chemical Vapor Deposition

Published online by Cambridge University Press:  25 February 2011

Garth B. Freeman ,
Woo Y. Lee ,
W. J. Lackey ,
John A. Hanigofsky  and
Karren More
Garth B. Freeman
Affiliation:
Georgia Institute of Technology, Georgia Tech Research Institute, Atlanta, GA 30332
Woo Y. Lee
Affiliation:
United Technologies, Research Center, East Hartford, CT 06108
W. J. Lackey
Affiliation:
Georgia Institute of Technology, Georgia Tech Research Institute, Atlanta, GA 30332
John A. Hanigofsky
Affiliation:
Georgia Institute of Technology, Georgia Tech Research Institute, Atlanta, GA 30332
Karren More
Affiliation:
High Temperature Materials Laboratory, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6062
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Abstract

This paper discusses the variation in microstructures encountered during the separate depositions of boron nitride (BN) and aluminum nitride (A1N) as well as during the codeposition of BNߝA1N dispersed phase ceramic coatings. This combination was chosen in order to take advantage of the self lubricating properties of hexagonal BN along with the hard, erosion resistance of A1N. Films were characterized using scanning and transmission electron microscopy (SEM and TEM), x-ray photoelectron spectroscopy (XPS), and x-ray diffraction (XRD).

A range of coating microstructures are possible depending on the conditions of deposition. The best films produced, in terms of hardness, density, and tenacity, were a fine mixture of turbostratic BN and preferentially oriented A1N whiskers aligned with the whisker axis perpendicular to the substrate surface as seen by both electron microscopy and x-ray diffraction.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 202: Symposium C – Evolution of Thin Film and Surface Microstructure , 1990 , 155
Copyright
Copyright © Materials Research Society 1991

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References

REFERENCES

1. Lee, W.Y., Lackey, W.J., and Agrawal, P.K., submitted to J. Am. Ceram. Soc., August, 1990.Google Scholar
2. Twait, D.J., Lackey, W.J., Smith, A. W., Lee, W.Y., and Hanigofsky, J. A., J. Am. Ceram. Soc. 73 (6), 1510–18 (1990).Google Scholar
3. Lee, W.Y., Lackey, W.J., Freeman, G.B., Agrawal, P.K., and Twait, D.J., submitted to J. Am. Ceram. Soc, July, 1989.Google Scholar
4. Lee, W.Y., Lackey, W.J., Agrawal, P.K., and Freeman, G.B., submitted to J. Am. Ceram. Soc, August, 1990.Google Scholar