Synthesis of oxide ceramics in a beam of fast electrons

The development of technology for obtaining high-entropy ceramic materials opens up new possibilities for obtaining new heat-shielding materials. In this work, such a material is synthesized using aluminum-yttrium garnet. The effect of rapid synthesis of high-entropy ceramics within a few seconds was achieved by using an unconventional method of heating the initial mixture of powder reagents with a powerful beam of high- energy electrons. The initial mixture of Y2O3, Yb2O3, Lu2O3, Eu2O3, Er2O3, Al2O3 oxides in a stoichiometric ratio was subjected to a short-term action of a powerful beam of fast electrons under atmospheric conditions. During the radiation exposure, the powder mixture underwent melting, which led to the synthesis of high- entropy ceramics (Y0.2Yb0.2Lu0.2Eu0.2Er0.2)3Al5O12. It was found that the melt has the form of drops with a large number of pores. The efficiency of mixture melting depends mainly on the irradiation modes and to a lesser extent on the modes of preliminary mechanical treatment of the mixture. A necessary condition for syn- thesis is melting of the powder mixture.