High rate production of nanopowders by the evaporation – condensation method using gyrotron radiation

摘要

A new method for metal oxide nanopowder produc-tion was proposed recently by the authors [1, 2]. It is theevaporation–condensation using a focused microwaveradiation. The source of microwaves was the technologi-cal gyrotron with frequency of 24 GHz and power up to7 kW with the energy density flux of 13 kW/cm 2 . Radia-tion was focused on a layer of powder of the treated ma-terial to ensure its evaporation, subsequent condensationof vapor in the gas stream, and deposition of particles onthe water-cooled surface. A scheme of the experiment isshown in Fig. 1.