| abstract |
The invention relates to the technical field of high-entropy ceramic materials, and specifically provides a high-entropy rare earth niobium/tantalum/molybdate ceramic and a preparation method thereof. The chemical formula of the high-entropy rare earth niobium/tantalum/molybdate ceramic is RE 3 (Nb 1/3 Ta 1/3 Mo 1/3 )O 7 , wherein RE is Y, Nd, Sm, Eu, Gd, Dy, Ho , any 3 to 7 different elements in Er, Yb and Lu. The preparation method includes the following steps: (1) weighing rare earth oxide, niobium pentoxide, tantalum pentoxide, molybdenum trioxide and molybdenum dioxide according to the stoichiometric ratio; (2) adding a solvent and a ball milling medium, and adopting a wet method Mixing raw materials by ball milling, vacuum drying and sieving to obtain uniformly mixed powder; (3) placing the uniformly mixed powder in a stainless steel mold for hydraulic compaction, and then cold isostatic pressing to obtain a densified body; (4) ) Put the green body into an alumina crucible, and place it in a high-temperature sintering furnace to sinter in an air atmosphere. The high-entropy ceramic prepared by the invention has low thermal conductivity, and the adopted preparation method has the advantages of simple and rapid process, low equipment requirements, low energy consumption, strong controllability and the like, and is easy to realize large-scale production. |