Ultrafast preparation method of high-performance SnTe based thermoelectric material

A high-performance technology for thermoelectric materials, applied in the field of ultra-fast preparation of high-performance SnTe-based thermoelectric materials, can solve the problems of unfavorable commercial application, long cycle, complicated process, etc., and achieve short preparation cycle, fast reaction speed and good repeatability Effect

Active Publication Date: 2015-01-07
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the melting annealing method generally takes 2-7 days, the process is complicated, and the cycle is relatively long, which is not conducive to commercial application

Method used

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  • Ultrafast preparation method of high-performance SnTe based thermoelectric material
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  • Ultrafast preparation method of high-performance SnTe based thermoelectric material

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Comparison scheme
Effect test

Embodiment 1

[0034] A method for ultrafast preparation of high-performance SnTe-based thermoelectric materials, comprising the following steps:

[0035] 1) According to the chemical formula SnTe (ie when M x sn 1-x The stoichiometric ratio of each element in Te in x=0) Weigh Sn powder, Te powder as raw material, raw material powder gross mass 4g, then they are ground and mixed uniformly, and the diameter of the uniformly mixed powder is pressed into the cylindrical shape of 10mm Block block (5MPa holding pressure 5min);

[0036] 2) End-ignite the block obtained in step 1) in a vacuum atmosphere to initiate a self-propagating high-temperature synthesis reaction (SHS), and cool naturally after the reaction is completed;

[0037] 3) Grinding the product obtained in step 2) into powder, performing plasma activation sintering (PAS), packing the powder into a 16mm graphite mold for compaction, and then sintering under the conditions of a vacuum of less than 10Pa and a sintering pressure of 40M...

Embodiment 2

[0040] A method for ultrafast preparation of high-performance SnTe-based thermoelectric materials, comprising the following steps:

[0041] 1) According to the chemical formula Cr 0.02 sn 0.98 Te (i.e. when M x sn 1-x The stoichiometric ratio of each atom in Te when x=0.02 and M is Cr) Weigh Sn powder, Te powder and Cr powder as raw materials, the total mass of raw powder is 4g, then they are ground and mixed uniformly, and the uniformly mixed powder is pressed Form a cylindrical block with a diameter of 10mm (5MPa for 5 minutes);

[0042] 2) End-ignite the block obtained in step 1) in a vacuum atmosphere to initiate a self-propagating high-temperature synthesis reaction (SHS), and cool naturally after the reaction is completed;

[0043] 3) Grinding the product obtained in step 2) into powder, performing plasma-activated sintering (PAS), packing the powder into a 16mm graphite mold for compaction, and then sintering under the conditions of a vacuum of less than 10Pa and a ...

Embodiment 3

[0046] A method for ultrafast preparation of high-performance SnTe-based thermoelectric materials, comprising the following steps:

[0047] 1) According to the chemical formula Zn 0.02 sn 0.98 Te (i.e. when M x sn 1-x The stoichiometric ratio of each atom in Te when x=0.02 and M is Zn) Weigh Sn powder, Te powder and Zn powder as raw material, the total mass of raw material powder is 4g, then they are ground and mixed uniformly, and the uniformly mixed powder is pressed Form a cylindrical block with a diameter of 10mm (5MPa for 5 minutes);

[0048] 2) End-ignite the block obtained in step 1) in a vacuum atmosphere to initiate a self-propagating high-temperature synthesis reaction (SHS), and cool naturally after the reaction is completed;

[0049] 3) Grinding the product obtained in step 2) into powder, performing plasma-activated sintering (PAS), packing the powder into a 16mm graphite mold for compaction, and then sintering under the conditions of a vacuum of less than 10P...

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Abstract

The invention relates to an ultrafast preparation method of a high-performance SnTe based thermoelectric material. The ultrafast preparation method comprises the following steps: weighing M powder, Sn powder and Te powder as raw materials according to the stoichiometric ratio of each element in the chemical formula MxSn(1-x)Te, wherein x is greater than or equal to 0 and less than or equal to 0.1, M refers to Cr, Co, Zn, Cd or In; next, grinding and evenly mixing the powder raw materials to obtain a reactant; 2) arousing a high-temperature self-propagating synthetic reaction of the reactant obtained in the step 1), and naturally cooling after the reaction is finished to obtain a single-phase SnTe based powdery thermoelectric material; 3) grinding the product obtained in the step 2) into powder, and performing spark plasma activated sintering to obtain the high-performance SnTe based bulk thermoelectric material. The ultrafast preparation method of the high-performance SnTe based thermoelectric material has the advantages of high reaction speed, simple process, efficient energy conservation, good repeatability and the like; the whole preparation process can be finished in 15 minutes, and the obtained thermoelectric figure ZT of merit of the obtained bulk material can be 1.01 at 910K.

Description

technical field [0001] The invention belongs to the technical field of preparation of new energy materials, and in particular relates to a method for ultrafast preparation of high-performance SnTe-based thermoelectric materials. Background technique [0002] So far, the natural environment on which human beings rely has been deteriorating day by day. At the same time, fossil energy (coal, oil and natural gas) is also rapidly depleting. Although these fossil energy, as the three pillars of world energy, have made an indelible contribution to the progress of human society, there are still some insurmountable defects in fossil energy, namely the non-renewability of resources and the harm to the environment. . Therefore, the development of new, environmentally friendly renewable clean energy and energy conversion technology has attracted great attention from governments around the world. Among them, thermoelectric conversion technology that can directly convert thermal energy i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05C22C13/00
Inventor 唐新峰梁涛苏贤礼鄢永高
Owner WUHAN UNIV OF TECH
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