CHANGES CAUSED IN THE PHYSICAL-PROPERTIES OF A POWDER BY AN ELECTRIC EXPLOSION

The article reports the results of spectral-correlation analysis of el astic waves generated by a high-velocity piston in a silicon carbide p owder. Sound was found to be dispersed intensively in the frequently r ange from 0 to 500 Hz while elastic waves with frequencies higher than 500 Hz were observed to propagate without dispersion in the compactib le powder. Waves of comparatively low frequency perform most of the wo rk of compacting SiC particles. Those waves also ensure that the compa cts have a high density, even in the case of a non-plastic material as silicon carbide. pulsed-vibratory compaction of products made of non- plastic powders during ceramics production is one of the most effectiv e vibratory compaction methods. A pulse of elastic vibrations is intro duced into the compact by means of an electric discharge in a liquid, in essence, an underwater electrical explosion [1].