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Synthesis of functionally graded metal-ceramic microstructures by chemical vapor deposition

Published online by Cambridge University Press:  03 March 2011

W.Y. Lee
Affiliation:
Oak Ridge National Laboratory, Oak-Ridge, Tennessee 37831-6063
Y.W. Bae
Affiliation:
Oak Ridge National Laboratory, Oak-Ridge, Tennessee 37831-6063
K.L. More
Affiliation:
Oak Ridge National Laboratory, Oak-Ridge, Tennessee 37831-6063
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Abstract

A composite microstructure consisting of small α-Al2O3 particles dispersed in a β-NiAl coating matrix was synthesized by chemical vapor deposition (CVD). White the surface of a pure Ni substrate was being reacted with AlCl3 and H2 to form β-NiAl at a temperature of 1050 °C, the partial pressure of CO2 in the reactor was controlled via pulsing to nucleate and disperse 50 to 500 nm α-Al2O3 particles in the β-NiAl matrix. The relative amount of the α-Al2O3 phase increased with coating thickness as the rate of the β-NiAl formation decreased with time. These experimental observations suggest that the synthesis of a graded composite microstructure by the CVD method is feasible.

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Rapid Communication
Copyright
Copyright © Materials Research Society 1995

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References

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