Structural characterization of combustion synthesized MoSi₂-Si₃N₄ composite powders and plasma sprayed MoSi₂-Si₃N₄ composites
H. Kung*, Y.C. Lu*, A.H. Bartlett,* R.G. Castro*, J.J. Petrovic*, E. Shtessel+
(*Los Alamos National Laboratory, +Exotherm Corporation)
A systematic structural characterization has been conducted on combustion synthesized MoSi₂-Si₃N₄ powders and plasma sprayed composites by transmission electron microscopy (TEM). The powders are cleaner and have less surface oxide contamination than most commercial powders. The distribution of the two phases can be tailored by modifying the synthesis conditions, which has resulted in improved retention of Si₃N₄ after plasma spraying. TEM studies performed on deformed composites indicate a strong link between even dispersion of second phases and enhanced dislocation plasticity in the plasma sprayed composites.
Keywords: composites; microstructure; self-propagating high-temperature synthesis (SHS)
Order No.: JA806-014 © 1998 MRS

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