Novel perovskite structure high-entropy ceramic and preparation method thereof

Abstract

The invention discloses a novel perovskite structure high-entropy ceramic and a preparation method thereof. The structure of the ceramic is an ABO3 type perovskite structure, the A-site element is Sr, and the B-site element is Zr, Hf, Ce, Yb and Me which are in an equal molar ratio. The preparation method comprises the following steps: putting the components into a mortar, adding absolute ethyl alcohol, and performing grinding; performing drying in a drying oven after the grinding, then transferring dried material into a muffle furnace for pre-calcining, and naturally cooling obtained material to room temperature to obtain a ceramic powder; putting the ceramic powder into the mortar, adding a polyvinyl alcohol aqueous solution and absolute ethyl alcohol, performing grinding again, and performing drying and sieving after the grinding is sufficient, adding the sieved ceramic powder into a steel mold of a table type powder tablet press, pre-pressing into a disc-shaped or strip-shaped block material, and then putting the block material into a cold isostatic press for cold isostatic pressing treatment to obtain a ceramic green body; and finally, calcining the ceramic green body in a muffle furnace, and performing cooling in the furnace to obtain the novel perovskite structure high-entropy ceramic. The high-entropy ceramic has the advantages of high stability, low thermal conductivity and relatively high hardness and density.

Description

technical field

[0001] The invention relates to the technical field of high-entropy ceramic materials. Specifically, it is a novel perovskite structure high-entropy ceramic and its preparation method. Background technique

[0002] High-entropy ceramics is a new concept that introduces high-entropy theory into the field of inorganic non-metals based on the research of high-entropy alloys. In the late 1990s, Professor Ye Junwei of Tsinghua University in Taiwan, China proposed the concept of high entropy, and defined it as the element types greater than or equal to 5 and no dominant element, and the content of all elements is between 5% and 35%. The high-entropy alloy is an alloy obtained by alloying more than five elemental components according to an equiatomic ratio or close to an equiatomic ratio. Single-phase high-entropy ceramics mainly include rock salt alloys, fluorite oxides, perovskite composite oxides, other oxides, borides, carbides, nitrides, and silicides. High-...

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