HIGH-ENTROPY RARE EARTH-TOUGHENED TANTALATE CERAMIC AND PREPARATION METHOD THEREFOR

摘要

The present invention relates to the technical field of high-entropy ceramics, and specifically disclosed is a high-entropy rare earth-toughened tantalate ceramic. The ceramic is prepared by sintering Ta205 powder and x types of different RE203 powder, wherein 4≤x≤9, and the molar ratio of the RE203 powder is 1. RE203 powder and Ta205 powder having the molar ratio of RE to Ta being 1:1 are weighed, a solvent is added for mixing, and ball milling is performed by a ball mill to obtain mixed powder M; the powder M is dried at a temperature of 650-850°C for 1.5-2 h to obtain dried powder; the powder is sieved to obtain powder N, the powder N is put in a mold for first pressing to obtain a rough blank, and the rough blank is then pressed for the second time to obtain a compact blank; the compact blank is sintered to obtain the high-entropy rare earth-toughened tantalate ceramic. The high-entropy ceramic has higher hardness and toughness.