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

A technology of filling skutterudite and high-pressure synthesis, which is applied in the high-pressure synthesis preparation of thermoelectric materials, high-performance densified filling skutterudite, and achieves the effects of short time, low temperature and superior mechanical processing performance

Inactive Publication Date: 2012-08-29
YANSHAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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 f

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Example 1: High-performance densified Li-filled CoSb 3 Preparation method of thermoelectric material

[0055] (1) Using simple Li (99.99%, particle), Co (99.99%, powder) and Sb (99.99%, powder) as raw materials, according to Li 2 co 4 Sb 12 Weigh 8g of the stoichiometric ratio, put it into a 10.8mm mold and prepare a preform with a thickness of 16mm on a tablet press.

[0056] (2) Put the preform into a high-pressure mold composed of graphite, pyrophyllite and boron nitride crucible, and perform the first step of high-pressure synthesis in a hinged six-sided top press. Raise the pressure to 3GPa, heat to about 800°C, hold the heat for 30 minutes, then cool and release the pressure, take out the preform and grind it thoroughly, put it into a 10.8mm mold and prepare a transitional blank with a thickness of 14mm on a tablet press.

[0057] (3) Put the transition blank into a high-pressure mold composed of graphite, pyrophyllite and boron nitride crucible, and perform t...

Embodiment 2

[0060] Example 2: High performance densified Na-filled CoSb 3 Preparation method of thermoelectric material

[0061] (1) Using elemental Na (99.99%, particle), Co (99.99%, powder) and Sb (99.99%, powder) as raw materials, according to Na 2 co 4 Sb 12 Weigh 8g of the stoichiometric ratio, put it into a 10.8mm mold and prepare a preform with a thickness of 16mm on a tablet press.

[0062] (2) Put the preform into a high-pressure mold composed of graphite, pyrophyllite and boron nitride crucible, and perform the first step of high-pressure synthesis in a hinged six-sided top press. Raise the pressure to 1GPa, heat to about 750°C, hold the heat for 30 minutes, then cool and release the pressure, take out the preform and grind it thoroughly, put it into a 10.8mm mold and prepare a transitional blank with a thickness of 14mm on a tablet press.

[0063] (3) Put the transition blank into a high-pressure mold composed of graphite, pyrophyllite and boron nitride crucible, and perfor...

Embodiment 3

[0066] Example 3: High performance densified Ca-filled CoSb 3 Preparation method of thermoelectric material

[0067] (1) Using elemental Ca (99.99%, powder), Co (99.99%, powder) and Sb (99.99%, powder) as raw materials, according to Ca 2 co 4 Sb 12 Weigh 8g of the stoichiometric ratio, put it into a 10.8mm mold and prepare a preform with a thickness of 16mm on a tablet press.

[0068] (2) Put the preform into a high-pressure mold composed of graphite, pyrophyllite and boron nitride crucible, and perform the first step of high-pressure synthesis in a hinged six-sided top press. Raise the pressure to 1GPa, heat to about 800°C, hold the heat for 30 minutes, then cool and release the pressure, take out the preform and grind it thoroughly, put it into a 10.8mm mold and prepare a transitional blank with a thickness of 14mm on a tablet press.

[0069](3) Put the transition blank into a high-pressure mold composed of ink, pyrophyllite and boron nitride crucible, and perform the se...

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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, ...

Claims

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Application Information

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IPC IPC(8): C22C1/04H01L35/34
Inventor 田永君张建军徐波杨建青于凤荣张茜刘亚迪李小会康宇龙于栋利何巨龙柳忠元
Owner YANSHAN UNIV
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