The invention relates to the technical field of high-entropy
ceramic materials, in particular to layered high-entropy double-
boron carbide ceramic powder and a preparation method thereof. The
chemical formula of layered high-entropy double-
boron carbide in the layered high-entropy double-
boron carbide ceramic powder is REB2C2, wherein RE is at least three different elements selected from Y, Ce, Gd, Dy and Er, and the
molar ratio of each of the elements is 1. The preparation method comprises the following steps: ball-milling and mixing at least three
metal oxides, a boron source and a
carbon source, compacting the uniformly mixed
powder to obtain a densified
green body,
sintering the
green body at high temperature to obtain a layered high-entropy double-
boron carbide block material, and finally, carrying out crushing and
grinding to obtain the layered high-entropy double-
boron carbide powder. The single-phase high-entropy double-
boron carbide ceramic powder with uniform components can be synthesized by taking the
metal oxides as raw materials and adopting a carbon / boron thermal reduction method; and the method is simple in preparation process, easy to control the reaction process, free of
impurity introduction, low in product preparation cost and suitable for
batch production.