High-entropy ceramic block and preparation method thereof

The invention relates to the technical field of ultrahigh-temperature ceramic composite materials, and discloses a high-entropy ceramic block and a preparation method thereof.The preparation method comprises the steps that amorphous ceramic powder is prepared, specifically, mixed powder of multiple single-component carbides is subjected to ball milling, and the amorphous ceramic powder with uniform components is obtained; preparing a carbon-containing ceramic green body: mixing the amorphous ceramic powder with a carbon source to obtain carbon-containing mixed powder, and preparing the mixed powder into the carbon-containing ceramic green body for reactive infiltration through a tabletting process and a slurry settling process; forming the high-entropy ceramic in situ through a melt infiltration method: putting the carbon-containing ceramic blank into a graphite crucible or a graphite paper box, and embedding by using transition metal or alloy thereof; and after infiltration is completed, residual alloy on th