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Method for preparing high-performance CoSb3-based thermoelectric materials by one step

A thermoelectric material and high-performance technology, which is applied in the field of preparing high-performance CoSb3-based thermoelectric materials, can solve problems such as hindering the batch process, long synthesis cycle, and complex synthesis process, and achieve shortened preparation cycle, short preparation time, and simplified synthesis process Effect

Active Publication Date: 2016-06-15
WUHAN UNIV OF TECH
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

But Mg 2 Mg element in Si and filled CoSb 3 The filling elements (mostly alkali metals, alkaline earth metals and rare metals) are easily oxidized, and need to be operated under the protective atmosphere of a glove box, which makes the synthesis process too complicated; although the doped skutterudite thermoelectric material can avoid the glove box The use of simplifies the process greatly, but its synthesis cycle is too long (it takes a few days) to hinder its batch process, making CoSb 3 Research and development of based thermoelectric materials have long been limited to laboratory scale

Method used

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  • Method for preparing high-performance CoSb3-based thermoelectric materials by one step
  • Method for preparing high-performance CoSb3-based thermoelectric materials by one step
  • Method for preparing high-performance CoSb3-based thermoelectric materials by one step

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Embodiment 1

[0030] One-step rapid preparation of high-performance CoSb 3 method based on thermoelectric materials, according to the chemical formula Co 4 Sb 12 (ie chemical formula Co 4-x m x Sb 12-y Te y The stoichiometric ratio of elements Co and Sb in x=0 and y=0) is 4:12, that is, take Co powder and Sb powder as raw materials according to the molar ratio of 4:12, with a total mass of 4g; then the raw material powder Use an agate mortar to grind and mix evenly by hand, put it into a 16mm graphite mold and compact it for plasma activation sintering, and then sinter under a vacuum condition of less than 10Pa, the heating rate is 100°C / min, and the sintering temperature is 550°C , the sintering pressure is 40MPa, and the holding time is 5min, that is, high-performance CoSb can be obtained 3 The bulk thermoelectric material, that is, Co 4 Sb 12 Dense bulk thermoelectric materials.

[0031] It can be seen from Figure 1 that the obtained bulk thermoelectric material is a single-phas...

Embodiment 2

[0033] One-step rapid preparation of high-performance CoSb 3 method based on thermoelectric materials, according to the chemical formula Co 3.5 Ni 0.5 Sb 12 (ie chemical formula Co 4- x m x Sb 12-y Te y In x=0.5 and y=0), the stoichiometric ratio of elements Co, Ni, and Sb is 3.5:0.5:12, that is, Co powder, Ni powder, and Sb powder are taken as raw materials according to the molar ratio of 3.5:0.5:12, and the total The mass is 4g; then the raw material powder is manually ground and mixed evenly with an agate mortar, and then packed into a 16mm graphite mold for compaction for plasma activation sintering, and then sintered under a vacuum condition of less than 10Pa, with a heating rate of 100 ℃ / min, the sintering temperature is 550℃, the sintering pressure is 40MPa, and the holding time is 5min, that is, high-performance CoSb can be obtained 3 The bulk thermoelectric material, that is, Co 3.5 Ni 0.5 Sb 12 Dense bulk thermoelectric materials.

[0034] It can be seen ...

Embodiment 3

[0036] One-step rapid preparation of high-performance CoSb 3 method based on thermoelectric materials, according to the chemical formula Co 4 Sb 11.5 Te 0.5 (ie chemical formula Co 4- x m x Sb 12-y Te y In x=0 and y=0.5), the stoichiometric ratio of elements Co, Sb and Te is 4:11.5:0.5, that is, taking Co powder, Sb powder and Te powder as raw materials according to the molar ratio of 4:11.5:0.5, the total The mass is 4g; then, after the raw material powder is ground and mixed evenly, it is put into a 16mm graphite mold and compacted for plasma activation sintering, and then sintering is carried out under a vacuum condition of less than 10Pa, the heating rate is 100°C / min, and the sintering temperature at 550°C, sintering pressure at 40MPa, and holding time at 5min, high-performance CoSb can be obtained 3 The bulk thermoelectric material, that is, Co 4 Sb 11.5 Te 0.5 Dense bulk thermoelectric materials.

[0037] It can be seen from Figure 3 that the obtained bulk t...

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Abstract

The invention relates to a method for preparing high-performance CoSb3-based thermoelectric materials by one step. The method is characterized in that Co powder, M powder, Sb powder and Te powder are weighed to serve as raw materials according to the stoichiometric ratio of all elements of the chemical formula Co<4-x>M<x>Sb<12-y>Te<y>, wherein 0<=x<=1.0, 0<=y<=1.0, and M is Fe or Ni; and then the raw material powder is subjected to plasma activated sintering after being mixed evenly, and in this way, the high-performance CoSb3-based block thermoelectric materials are obtained. According to the method, elementary substance powder is adopted for preparing the CoSb3-based thermoelectric materials through direct plasma activated sintering for the first time, reactive synthesis and sintering densification can be completed only through one step of operation, and the whole preparation process only needs several minutes. The method has the advantages of being high in reaction speed, short in preparation time, simple in equipment and process, efficient, capable of saving energy, high in temperature rising and decreasing rate and the like. The method is suitable for scale production.

Description

technical field [0001] The invention belongs to the technical field of preparation of new energy materials, in particular to one-step preparation of high-performance CoSb 3 approach to thermoelectric materials. Background technique [0002] The process of industrialization in today's world is deepening, and the accompanying energy crisis is becoming more and more serious, so energy issues are getting more and more attention. Now that my country's economy is developing at a high speed, energy consumption has also increased significantly. Ensuring energy security and efficient use is the guarantee for the improvement of our people's living standards and national revitalization. Therefore, it is an urgent need to develop new energy sources and take the road of sustainable energy development. Among them, the environment-friendly thermoelectric conversion technology, which can realize the direct conversion of heat energy and electric energy, has attracted extensive attention of...

Claims

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Application Information

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IPC IPC(8): C22C1/04C22C30/00H01L35/34
Inventor 唐新峰梁涛苏贤礼鄢永高
Owner WUHAN UNIV OF TECH
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