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Abstract |
Ultrasonic Methods of Preparation of
Powder Materials for Composite Production
G.Prokopenko, B.N.Mordyuk, A.E.Perekos
(G.V.Kurdyumov Institute for Metal Physics NAS of Ukraine, Kiev, Ukraine)
e-mail:
prokop@imp.kiev.ua
The
ultrasonic grinding mill is designed. Three mechanisms of effect on powders can
be realized in ultrasonic grinding mill : effect of ultrasonic vibrations;
mechanism of shock ultrasonic treatment (with free working elements); effect of
ultrasonic cavitation. The complex of these effects allows to make accelerated
(1.10 hours) mincing, mixing and mechanical alloying of powder mixtures. For
matching - at a customary mechanical alloying in planetary grinding mill the
score of a run time goes for day (50.200 hours). The optimum regimes of
ultrasonic treatment of powders are determined, namely power and duration of
processing, different liquids (ethyl spirit, glycerin, acetone, water), spacing
coefficient of the chamber for processing by spheres, energetic tensity and
temperature in the chamber, influencing of hydrostatic pressure increasing. The
possibility of modifying of a surface of powder materials for improvement of
their wettings by metals melts or for improvement sintering in ultrasonic field
is investigated (in installation designed by us). The capability of obtaining
of solid solutions CuNiFe and CuNi after ultrasonic milling is shown and their
magnetic properties are studied.
Section
: 11