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Method for ultra-quickly preparing high-performance ZrNiSn bulk thermoelectric material through one step

A thermoelectric material and high-performance technology, which is applied in the field of ultra-fast preparation of high-performance ZrNiSn bulk thermoelectric materials, can solve problems such as oxidation, and achieve the effects of simple operation, reduced lattice thermal conductivity, and improved thermoelectric performance.

Active Publication Date: 2017-11-07
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method still takes hours and is prone to oxidation during the milling process after self-spreading

Method used

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  • Method for ultra-quickly preparing high-performance ZrNiSn bulk thermoelectric material through one step
  • Method for ultra-quickly preparing high-performance ZrNiSn bulk thermoelectric material through one step
  • Method for ultra-quickly preparing high-performance ZrNiSn bulk thermoelectric material through one step

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Experimental program
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Effect test

Embodiment 1

[0037] One-step ultrafast method for preparing high-performance ZrNiSn bulk thermoelectric material, it comprises the following steps:

[0038] 1) Weigh 12g of Zr powder, Ni powder, and Sn powder according to the stoichiometric ratio of 1:1:1 as raw materials, and mix them uniformly to obtain the reactant; cold press the reactant at 4MPa for 2min to obtain a preform with a diameter of 16mm and a height of 12mm cylindrical body;

[0039] 2) Wrap the pressed columnar green body with quartz sand and put it into a steel mold, put the steel mold into the reaction chamber, and fill it with 50kPa argon after vacuuming; then, under the protection of argon atmosphere, Tungsten argon arc welding is used to initiate the chemical reaction, the arc starting current is 20A, and then an axial high pressure of 200MPa is applied to the columnar body within 2s, and the pressure is maintained for 10s, and finally a high-performance ZrNiSn bulk thermoelectric material with a density of 98.3% is o...

Embodiment 2

[0044] One-step ultrafast method for preparing high-performance ZrNiSn bulk thermoelectric material, it comprises the following steps:

[0045] 1) Weigh 12g of Zr powder, Ni powder, and Sn powder according to the stoichiometric ratio of 1:1:1 as raw materials, and mix them uniformly to obtain the reactant; cold press the reactant at 4MPa for 2min to obtain a preform with a diameter of 16mm and a height of 12mm cylindrical body;

[0046] 2) Wrap the pressed columnar green body with quartz sand and put it into a steel mold, put the steel mold into the reaction chamber, and fill it with 50kPa argon after vacuuming; then, under the protection of argon atmosphere, Tungsten argon arc welding is used to initiate the chemical reaction, the arc starting current is 20A, and then an axial high pressure of 300MPa is applied to the columnar blank within 2s, and the pressure is maintained for 10s, and finally a high-performance ZrNiSn bulk thermoelectric material with a density of 98.5% is ...

Embodiment 3

[0048] One-step ultrafast method for preparing high-performance ZrNiSn bulk thermoelectric material, it comprises the following steps:

[0049] 1) Weigh 12g of Zr powder, Ni powder, and Sn powder according to the stoichiometric ratio of 1:1:1 as raw materials, and mix them uniformly to obtain the reactant; cold press the reactant at 4MPa for 2min to obtain a preform with a diameter of 16mm and a height of 12mm cylindrical body;

[0050] 2) Wrap the pressed columnar green body with quartz sand and put it into a steel mold, put the steel mold into the reaction chamber, and fill it with 30kPa argon after vacuuming; then, under the protection of argon atmosphere, Tungsten argon arc welding is used to initiate a chemical reaction, the arc starting current is 20A, and then an axial high pressure of 300MPa is applied to the columnar blank within 2s, and the pressure is maintained for 10s, and finally a high-performance ZrNiSn bulk thermoelectric material with a density of 97.97% is o...

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Abstract

The invention relates to a method for ultra-quickly preparing a high-performance ZrNiSn bulk thermoelectric material through one step. The method is characterized by comprising the steps that a chemical reaction of Zr powder, Ni powder and Sn powder is triggered by adopting argon tungsten-arc welding and the like by taking the Zr powder, the Ni powder and the Sn powder as initial raw materials under protection of an argon atmosphere, in-situ quick pressurizing is conducted within seconds, and then the high-performance ZrNiSn bulk thermoelectric material is obtained. The method has the advantages of being high in reaction speed, simple in technology, efficient, capable of saving energy and the like; the whole process is completed within 5 min, the thermoelectric performance of the obtained product is excellent, the thermoelectric merit figure can reach 0.64 at 900 K, and an important foundation is laid for large-scale industrialized application of the product.

Description

technical field [0001] The invention belongs to the field of new energy materials, and in particular relates to a method for preparing high-performance ZrNiSn bulk thermoelectric materials in one step. Background technique [0002] With the progress of society, energy and environmental issues have become the most severe challenges faced by mankind in the new century. Thermoelectric materials can directly convert thermal energy to electrical energy, and have the characteristics of small size, high reliability, no emission of pollutants, wide applicable temperature range, and environmental friendliness, and have become a current research hotspot. The power generation efficiency of thermoelectric materials is mainly determined by the performance figure of merit ZT of thermoelectric materials. ZT=(α 2 σ / к)T=α 2 Tσ / (κ L +κ e ), where к is the thermal conductivity (including the lattice thermal conductivity κ L and electronic thermal conductivity κ e ), σ is the electrical ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/04C22C1/04B22F3/02B22F3/14B22F3/23
CPCC22C30/04B22F3/02B22F3/14B22F3/23C22C1/047
Inventor 唐新峰胡铁铮杨东旺鄢永高苏贤礼曹宇
Owner WUHAN UNIV OF TECH
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