High-pressure synthesis preparation method of high-performance densification filled skutterudite thermoelectric material

Abstract

The invention discloses a high-pressure synthesis preparation method of a high-performance densification filled skutterudite thermoelectric material, which is characterized in comprising the following steps that 1) reaction raw materials with correspondent doses are mixed and subjected to cold press molding according to a chemical proportion for the planned synthesized filled skutterudite thermoelectric material; 2) primary high-pressure synthesizing is carried out, wherein the pressure range is 1 to 6GPa, the reaction temperature is 700 to 900 DEG C, the time is 10 to 120 minutes, the raw materials are mixed to be reacted with one another to primarily generate a transition product, and an obtained product is uniformly ground and subjected to cold press molding after being cooled and decompressed; 3) secondary high-pressure synthesizing is carried out, wherein the pressure range is 1 to 5 GPa, the reaction temperature is 550 to 650 DEG C, the time is 30 to 60 minutes, the synthesized filled shutterudite material is subjected to grinding, acidifying, drying and cold press molding after being cooled and decompressed; and 4) the final block thermoelectric material is obtained by adopting a high-pressure sintering or an electric spark discharging technology. The prepared product has high density, good mechanical machining performance and excellent thermoelectric performance, and the dimensionless thermoelectric figure of merit (ZT) is generally higher than 1. At the same time, the method and the device have simple process, take less time, save energy and have excellent industrialized production and an application prospect.

Description

technical field [0001] The invention relates to the field of thermoelectric materials, in particular to a high-pressure synthesis and preparation method of high-performance densified filled skutterudite thermoelectric materials. Background technique [0002] At this stage, the total global energy consumption is about 14TW (1TW=10 12 js -1 ), of which 80% comes from the final release of CO 2 of oil, natural gas and coal, and carbon-free renewable clean energy (geothermal, solar, wind, etc.) accounted for only 1%. With the development of industrialization, it can be expected that the total global energy consumption will reach 25-30TW by the middle of this century. If 80% of it is still provided by petrochemical and fossil fuels, the resulting CO 2 Pollution will pose a serious threat to human civilization. It is a major problem facing human society to successfully transition the current energy economy based on petrochemical and fossil fuels to a large-scale, sustainable, ...

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the defects of the existing normal-pressure preparation method, the present invention provides a high-pressure synthesis preparation method of high-performance densified filled skutterudite thermoelectric material, which can realize the filling of more types of elements in the skutterudite material, and the obtained filling The skutterudite thermoelectric material has low thermal conductivity and high power factor, thus effectively improving the thermoelectric figure of merit of the material (ZT>1)

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