PREPARATION OF SILICON CARBIDE/NITRIDE NANOCOMPOSITES WITH OXIDES OR
NITRIDES
J. Grabis, D. Jankovica, M. Berzins, Institute of Inorganic Chemistry,
Riga Technical University, Miera Str.34, Salaspils, LV-2169, Latvia
Silicon carbide/nitride based nanocomposites due to their hardness,
mechanical strength, good corrosion and oxidation resistance at
elevated temperature are promising candidate for high-temperature
application and manufacture metal or ceramic matrix composites. The
highly homogeneous silicon carbide/nitride nanosized powders and their
composites with oxides sintering aids or titanium and aluminium
nitrides were prepared by evaporation of raw materials in nitrogen
plasma flow as well as by chemical deposition of oxides[ ]on the
nanosized particles.
The average particle size of the silicon carbide/nitride nanopowders
with oxides and nitrides are determined by concentration of particles
in the plasma, by their cooling rate and ratio of components. The
typical average particle size of the nanocomposites is in the range of
30-60 nm. The microstructure of particles depends on formation or
condensation temperature of single components as well as on
preparation conditions. The difference in formation temperatures leads
to growth of coated particles. The produced nanocomposites find
application in manufacture high temperature materials, wear resistant
materials and cermets.

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