Method for preparing p-type filling type skutterudite compound thermoelectric material

Abstract

The invention belongs to the field of new energy materials, and particularly relates to a method for preparing filling type skutterudite thermoelectric compound. A method for preparing the p-type filling type skutterudite compound thermoelectric material comprises the following steps: firstly, taking high-purity granule type M, Fe, Co and Sb as starting reaction materials, weighing reaction raw materials in an Ar gas glove box according to the chemical formula MFe4-xCoxSb12+y, wherein 0<=x<=3, 0<=y<=1.0, mixing the high purity granule type M, Fe, Co and Sb, then, pressing into columnar blocks under the pressure of 300 to 400MPa, secondly, melting columnar blocks, swinging melted welding flux in argon atmosphere, obtaining belt-shaped products, thirdly, sintering in vacuum through a discharge plasma sintering method after coarsely grinding and pressing the belt-shaped products tightly, and obtaining single-phase compact p-type filling type skutterudite compound thermoelectric material. The method for preparing p-type filling type skutterudite compound thermoelectric material has the characteristics of simple technique, short reaction time, low energy consumption, excellent repeatability, and the like.

Description

technical field [0001] The invention belongs to the field of new energy materials, and in particular relates to a preparation method of a filled skutterudite 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] The performance of thermoelectric materials is measured by the dimensionless thermoelectric p...

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Problems solved by technology

In order to further shorten the preparation cycle, some people use the strip casting method to pour the melt on the rotating water-cooled copper roller, and obtain 10 by controlling the pouring amount and the speed of the copper roller. 2 ~10 4 K / s cooling rate, control the cooling rate of the strips obtained (2°C / min between 700°C and 500°C), and obtain strips whose main phase is filled skutterudite. The strips obtained by this method There is often a small amount of second phase FeSb in the 2 and Sb, making the thermoelectric performance decrease

Because of this, the inventor of this patent later proposed an improved process, which is to grind and press the obtained strips before sintering. The sintering temperature is 953K~1193K, and the sintering time is 3h, which makes the preparation cycle longer.

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