Method for rapidly preparing ZrNiSn thermoelectric material

A thermoelectric material and fast technology, which can be applied in the direction of thermoelectric device node lead-out material, etc., can solve the problems of increasing energy consumption, reducing lattice thermal conductivity, nano-grain growth, etc., achieving short synthesis cycle and low energy consumption. Effect

Inactive Publication Date: 2019-07-23
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Recently, the developed combustion synthesis (also known as self-propagating high-temperature synthesis, Self-propagating High-temperature Synthesis, referred to as SHS) combined with spark plasma sintering to prepare ZrNiSn-based thermoelectric materials, this method compared with the traditional method, to a certain extent The material preparation cycle is shortened, but this method cannot significantly reduce the lattice thermal conductivity of the material
At the same time, it is necessary to further use spark plasma sintering. Although the sintering process can be completed within 0.5h, it will also prolong the preparation cycle and increase energy consumption. At the same time, the nano-grain or micro-grain in the material will continue to grow Both are not conducive to phonon scattering and reduce the thermal conductivity of the lattice, thus adversely affecting the improvement of the thermoelectric properties of the material

Method used

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  • Method for rapidly preparing ZrNiSn thermoelectric material
  • Method for rapidly preparing ZrNiSn thermoelectric material
  • Method for rapidly preparing ZrNiSn thermoelectric material

Examples

Experimental program
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Effect test

Embodiment 1

[0036] According to the stoichiometric molar ratio of 1:1:1, Zr powder, Ni powder and Sn powder with a purity greater than 99.9% were weighed, mixed evenly, and then cold-pressed into a columnar body with a uniaxial pressure of 5 MPa and a holding time of 15 minutes to obtain a diameter of 40 mm. , 20mm high columnar green body;

[0037] Place the cold-pressed green body in a quartz mold, place the mold at one end of the centrifuge in a steel reaction chamber, place a tungsten coil as an ignition medium on the upper surface of the green body, and pump the reaction chamber to a vacuum of 10 -3 Pa;

[0038] Turn on the high-speed rotation of the centrifuge, set the gravity field to 1500G, and burn the tungsten wire spring coil under the supergravity field to ignite the green body to produce a combustion synthesis reaction;

[0039] After the reaction is over, continue to apply the supergravity field for 10 minutes;

[0040] The supergravity field was removed, and the sample wa...

Embodiment 2

[0048] Weigh Zr powder, Ni powder and Sn powder with a purity greater than 99.9% according to the stoichiometric molar ratio of 1:1:1, mix them evenly, and cold press them into a columnar green body. The uniaxial pressure is 8 MPa, and the holding time is 12 minutes to obtain a diameter of 40 mm. , 20mm high columnar green body;

[0049] Place the cold-pressed green body in a quartz mold, place the mold at one end of the centrifuge in a steel reaction chamber, place a tungsten coil as an ignition medium on the upper surface of the green body, and pump the reaction chamber to a vacuum of 10 -4 Pa;

[0050] Turn on the high-speed rotation of the centrifuge, set the gravity field to 1200G, and burn the tungsten wire spring coil under the supergravity field to ignite the green body to produce a combustion synthesis reaction;

[0051] After the reaction is over, continue to apply the supergravity field for 15 minutes;

[0052] The supergravity field was removed, and the sample wa...

Embodiment 3

[0056] Weigh Zr powder, Ni powder and Sn powder with a purity greater than 99.9% according to the stoichiometric molar ratio of 1:1:1, mix them evenly, and cold press them into a columnar green body with a uniaxial pressure of 10 MPa and a holding time of 8 minutes to obtain a diameter of 40 mm. , 20mm high columnar green body;

[0057] Place the cold-pressed green body in a quartz mold, place the mold at one end of the centrifuge in the steel reaction chamber, place a tungsten coil as an ignition medium on the upper surface of the green body, and vacuum the reaction chamber and fill it with inert Gas to 5Pa;

[0058] Turn on the high-speed rotation of the centrifuge, set the gravity field to 1000G, and burn the tungsten wire spring coil under the supergravity field to ignite the green body to produce a combustion synthesis reaction;

[0059] After the reaction, continue to apply the supergravity field for 10 minutes.

[0060] The supergravity field was removed, and the samp...

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Abstract

The invention provides a method for rapidly preparing ZrNiSn thermoelectric material and belongs to the technical field of thermoelectric material preparation. The method comprises the following steps: pressing mixed powder consisting of Zr powder, Ni powder and Sn powder into a green body; carrying out combustion synthesis reaction on the green body under the supergravity condition; and obtainingZrNiSn thermoelectric material after cooling. According to the method, the thermoelectric material is prepared by utilizing the combustion synthesis reaction under the supergravity condition, the material density is increased while avoiding grain growth, the heat conductivity of the crystal lattice of ZrNiSn thermoelectric material is reduced favorably, and the thermoelectric performance of the material is optimized. The result of the embodiment indicates that the the the thermoelectric figure of merit of the prepared ZrNiSn thermoelectric material can reach 0.65 at 923K. In addition, the preparation method also has the characteristics of being short in synthesis period and low in energy consumption and is suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to the technical field of thermoelectric material preparation, in particular to a preparation method of ZrNiSn thermoelectric material. Background technique [0002] Thermoelectric material is a functional material that utilizes the movement of carriers inside a solid to realize direct mutual conversion of thermal energy and electrical energy. In the process of thermoelectric energy conversion, no waste is generated and the environment will not be polluted. It has broad application prospects in the fields of industrial waste heat power generation, solar-photovoltaic power generation, and local cooling of solid devices. The conversion efficiency of thermoelectric materials is described by the dimensionless thermoelectric figure of merit ZT, ZT=s 2 σT / κ, where s, σ, κ and T are the Seebeck coefficient, electrical conductivity, thermal conductivity and absolute temperature, respectively. In order to increase the ZT value of thermoe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/04C22C30/04B22F3/23H01L35/20H10N10/854
CPCC22C1/04C22C30/04B22F3/23B22F2998/10B22F2999/00H10N10/854B22F3/02B22F2201/20B22F2201/10
Inventor 张贺古宏伟屈飞丁发柱李辉
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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