Abstract
A composite microstructure consisting of small α-al2O3particles dispersed in a β-NiAl coating matrix was synthesized by chemical vapor deposition (CVD). While the surface of a pure Ni substrate was being reacted with AICI3and H2 to form β-NiAl at a temperature of 1050 °C, the partial pressure of CO2in the reactor was controlled via pulsing to nucleate and disperse 50 to 500 nm α-Al2O3particles in the β-NiAl matrix. The relative amount of the α-Al2O3phase 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.
Original language | English |
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Pages (from-to) | 3000-3002 |
Number of pages | 3 |
Journal | Journal of Materials Research |
Volume | 10 |
Issue number | 12 |
DOIs | |
State | Published - 1 Dec 1995 |