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Preparation method of room-temperature magnesium-based thermoelectric material and product

A thermoelectric material and room temperature technology, applied in the manufacture/processing of thermoelectric devices, thermoelectric device junction lead-out materials, etc., can solve the problems of easy introduction of impurities, unfavorable control of sample composition content, and safety accidents easily caused by raw material fine powder ball milling And other issues

Active Publication Date: 2021-07-06
CHONGQING INST OF GREEN & INTELLIGENT TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of this method are: the synthesis takes a long time, the raw materials will react with the reaction vessel, and it is easy to obtain α-MgAgSb with impurities
The disadvantages of this method are: the steps are complicated, the powder is easy to stick to the ball or the inside of the ball mill tank, and impurities are easily introduced when transferring the sample, which is not conducive to the control of the specific component content of the sample, and the raw material fine powder ball mill is prone to safety accidents
The disadvantages of this method are: the steps are complicated, the powder is easy to stick to the ball or the inside of the ball mill tank, and impurities are easily introduced when transferring the sample, which is not conducive to the control of the specific component content of the sample, and the raw material fine powder ball mill is prone to safety accidents
The disadvantage of this method is that the synthesis takes a long time, the steps are complicated, and the energy consumption is high

Method used

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  • Preparation method of room-temperature magnesium-based thermoelectric material and product
  • Preparation method of room-temperature magnesium-based thermoelectric material and product
  • Preparation method of room-temperature magnesium-based thermoelectric material and product

Examples

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Effect test

Embodiment 1

[0031] Preparation of room temperature magnesium-based thermoelectric materials

[0032]Mg powder with a purity of not less than 99.9%, Sb powder with a purity of not less than 99.999%, and Ag powder with a purity of not less than 99.99% are classified as α-Mg 1.01 AgSb 0.99 The stoichiometric ratio of each atom in the gas is weighed, and the Mg powder, Sb powder and Ag powder are sequentially loaded into the graphite mold, and then the graphite mold is placed in the cavity of the discharge plasma instrument, and the discharge plasma instrument is started after vacuuming to 10Pa. First heat up to 600°C at a rate of 100°C / min, then to 700°C at a rate of 50°C / min, to 800°C at a rate of 30°C / min, and finally to 950°C at a rate of 20°C / min After holding the heat for 30 minutes, continue vacuuming during the period, and apply a pressure of 20 MPa on the graphite mold, and then cool down to 600°C to obtain a room temperature magnesium-based thermoelectric material precursor, take t...

Embodiment 2

[0036] Preparation of room temperature magnesium-based thermoelectric materials

[0037] Mg powder with a purity of not less than 99.9%, Sb powder with a purity of not less than 99.999%, and Ag powder with a purity of not less than 99.99% are classified as α-Mg 0.99 AgSb 0.97 The stoichiometric ratio of each atom in the gas is weighed, and the Mg powder, Sb powder and Ag powder are sequentially loaded into the graphite mold, and then the graphite mold is placed in the cavity of the discharge plasma instrument, and the discharge plasma instrument is started after vacuuming to 8Pa. First raise the temperature to 600°C at a rate of 80°C / min, then raise the temperature to 800°C at a rate of 50°C / min, and finally raise the temperature to 900°C at a rate of 20°C / min. A pressure of 30MPa was applied to the mold, and then the temperature was lowered to 400°C to obtain a magnesium-based thermoelectric material precursor at room temperature. The precursor was taken out and put into a g...

Embodiment 3

[0039] Preparation of room temperature magnesium-based thermoelectric materials

[0040] Mg powder with a purity of not less than 99.9%, Sb powder with a purity of not less than 99.999%, and Ag powder with a purity of not less than 99.99% are classified as α-Mg 0.98 AgSb 0.95 The stoichiometric ratio of each atom in the gas is weighed, and the Mg powder, Sb powder and Ag powder are sequentially loaded into the graphite mold, and then the graphite mold is placed in the cavity of the discharge plasma instrument, and the discharge plasma instrument is started after vacuuming to 5Pa. First raise the temperature to 600°C at a rate of 60°C / min, then raise the temperature to 800°C at a rate of 30°C / min, and finally raise the temperature to 1000°C at a rate of 20°C / min. A pressure of 40MPa is applied to the mold, and then the temperature is lowered to 500°C to obtain a room temperature magnesium-based thermoelectric material precursor. The precursor is taken out and put into a graphi...

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Abstract

The invention relates to a preparation method of a room-temperature magnesium-based thermoelectric material and a product, and belongs to the technical field of thermoelectric materials. According to the preparation method of the room-temperature magnesium-based thermoelectric material, solid-phase reaction and solid-phase sintering of the material are completed in one step by optimizing preparation process conditions on the basis of the spark plasma sintering technology; the synthesis time is shortened to about 50 minutes; the finally prepared material is high in density; and the relative density of the prepared material is greater than 99%. Compared with the prior art, the method has the advantages that transfer of samples is reduced, introduction of impurities in the transfer process is avoided, a second phase generated by reaction between the raw material and a container is avoided, the steps are simple, the operation is easy, and the safety of the operation process is ensured.

Description

technical field [0001] The invention belongs to the technical field of thermoelectric materials, and in particular relates to a preparation method and products of room temperature magnesium-based thermoelectric materials. Background technique [0002] A thermoelectric material is a functional material that converts thermal energy and electrical energy through the directional movement of carriers inside the material. The performance of thermoelectric materials is characterized by the dimensionless thermoelectric figure of merit zT. The calculation formula is zT=(S 2 σ)T / K, where S is the Seebeck coefficient, σ is the electrical conductivity, T is the absolute temperature, and K is the total thermal conductivity. The larger zT is, the better the performance of the material. Thermoelectric devices made of thermoelectric materials have the advantages of low noise, high reliability, and long service life. At present, thermoelectric materials have potential application markets...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/04C22C23/00B22F3/105H01L35/18H01L35/34H10N10/01H10N10/853
CPCC22C1/0408C22C23/00B22F3/105B22F2003/1051H10N10/853H10N10/01
Inventor 王国玉戴璐
Owner CHONGQING INST OF GREEN & INTELLIGENT TECH CHINESE ACADEMY OF SCI
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