Rapid preparation of high performance nanostructured filling type skutterudite thermoelectric material

Abstract

The invention relates to a preparing method of thermoelectric compound, in particular to a fast preparing method of filled type skutterudite thermoelectric material with high performance nanostructure. The invention is characterized in that the method comprises the following steps: 1) batching: granular Yb, granular Co and granular Sb are used as starting materials and weighed according to the chemical formula Yb0.3Co4Sb12.3; 2) preparing master alloy: the granular Yb, the granular Co and the granular Sb are mixed, then put into a melting furnace, heated slowly to 1100 DEG C by adopting rate of temperature increase of 2 DEG C / min and melted for 20 to 30h so as to obtain melt; the melt is quenched in supersaturated salt water so as to obtain the master alloy; 3) the master alloy is carried out cleaning processing, placed in an induction heating furnace to be melted to melt and then rotatablely throws the melt so as to obtain a strap product with an amorphous / nanocrystalline composite structure; and 4) the strap product with the amorphous / nanocrystalline composite structure is ground, tableted and then sintered by using discharging plasma so as to obtain filled type skutterudite thermoelectric material with high performance nanostructure. The method has short preparation period, low energy consumption, simple and easy-control technique, safety and no pollution.

Description

technical field [0001] The invention belongs to the field of new energy materials, and in particular relates to a preparation method of a thermoelectric compound. Background technique [0002] Thermoelectric power generation is a fully static direct power generation method that uses thermoelectric conversion materials to convert heat energy into electrical energy. It has the advantages of compact structure, reliable performance, no noise during operation, no wear, no leakage, and flexible movement. It can generate potential, which plays an important role in the fields of military, aerospace, medicine, and microelectronics. As energy and environmental issues become increasingly prominent, thermoelectric batteries, as a green energy technology with a wide range of adaptability and environmental protection, have attracted more and more attention. focus on. [0003] Filled skutterudite (skutterudite) compound exhibits the thermoelectric transport characteristics of electron cry...

AI Technical Summary

Problems solved by technology

The traditional SSR method takes a long time to prepare, generally takes 7 to 10 days, consumes a lot of time and energy, and has no major breakthrough in performance in recent years

Other chemical methods such as CC and SG methods can obtain nanopowders with fine grain size, but due to the surface oxidation of nanoparticles and the existence of a large number of bulk defects, it has an adverse effect on the sintering densification process, resulting in the final sintered Bulk products are often not dense and have unsatisfactory thermoelectric properties

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