Synthesis of oxide ceramics in a beam of fast electrons

Abstract

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 (Y_0.2Yb_0.2Lu_0.2Eu_0.2Er_0.2)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.