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A kind of preparation method of preferentially oriented n-type bismuth telluride-based polycrystalline bulk thermoelectric material

A bismuth telluride-based, preferentially oriented technology, applied in chemical instruments and methods, selenium/tellurium compounds, metal selenides/tellurides, etc., can solve the problem of difficulty in preparing powders with uniform particle size, and achieve dimensionless thermoelectric advantages. High value, high product density, good repeatability

Active Publication Date: 2022-08-02
湖北赛格瑞新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, powders prepared by conventional powder-making methods have a wide particle size distribution (from nanometers to tens of microns), and it is difficult to prepare powders with uniform particle sizes.

Method used

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  • A kind of preparation method of preferentially oriented n-type bismuth telluride-based polycrystalline bulk thermoelectric material
  • A kind of preparation method of preferentially oriented n-type bismuth telluride-based polycrystalline bulk thermoelectric material
  • A kind of preparation method of preferentially oriented n-type bismuth telluride-based polycrystalline bulk thermoelectric material

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Experimental program
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Effect test

Embodiment 1

[0031] The preparation method of the preferred orientation n-type bismuth telluride-based polycrystalline bulk thermoelectric material provided in this embodiment is as follows:

[0032] Using Bi, Te and Se elemental powders with a mass percentage of more than 99.99% as raw materials, according to Bi 2 Te 2.79 Se 0.21 Stoichiometric ratio ingredients;

[0033] The above-mentioned raw materials are put into a quartz glass tube or borosilicate glass tube and vacuum sealed, and then the sealed quartz glass tube or high borosilicate glass tube is put into a swing furnace for high temperature melting, the melting temperature is 630 ℃, and the melting time is 5min. After the smelting is completed, the hearth of the swing furnace is rotated to a vertical position, and cooled slowly to obtain a high-density n-type bismuth telluride-based alloy crystal rod;

[0034] The prepared n-type bismuth telluride-based alloy crystal rod is cut into blocks, and the blocks are loaded into an e...

Embodiment 2

[0041] The preparation method of the preferred orientation n-type bismuth telluride-based polycrystalline bulk thermoelectric material provided in this embodiment is as follows:

[0042] Using Bi, Te and Se elemental powders with a mass percentage of more than 99.99% as raw materials, according to Bi 2 Te 2.7 Se 0.3 Stoichiometric ratio ingredients;

[0043] The above-mentioned raw materials are put into a quartz glass tube or borosilicate glass tube and vacuum sealed, and then the sealed quartz glass tube or high borosilicate glass tube is put into a swing furnace for high-temperature melting. The melting temperature is 630 ° C, and the melting time is 5min. After the smelting is completed, the hearth of the swing furnace is rotated to a vertical position, and cooled slowly to obtain a high-density n-type bismuth telluride-based alloy crystal rod;

[0044] The prepared n-type bismuth telluride-based alloy crystal rod is cut into blocks, and the blocks are loaded into an e...

Embodiment 3

[0052] The preparation method of the preferred orientation n-type bismuth telluride-based polycrystalline bulk thermoelectric material provided in this embodiment is as follows:

[0053] Using Bi, Te and Se elemental powders with a mass percentage of more than 99.99% as raw materials, according to Bi 2 Te 2.4 Se 0.6 Stoichiometric ratio ingredients;

[0054] The above-mentioned raw materials are put into a quartz glass tube or borosilicate glass tube and vacuum sealed, and then the sealed quartz glass tube or high borosilicate glass tube is put into a swing furnace for high-temperature melting. The melting temperature is 630 ° C, and the melting time is 10min. After the smelting is completed, the hearth of the swing furnace is rotated to a vertical position, and cooled slowly to obtain a high-density n-type bismuth telluride-based alloy crystal rod;

[0055] The prepared n-type bismuth telluride-based alloy crystal rod is cut into blocks, and the blocks are loaded into an ...

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Abstract

The invention provides a method for preparing an n-type bismuth telluride-based polycrystalline bulk thermoelectric material with a preferred orientation, which comprises the following steps: 2 Te 3‑x Se x Weigh the ingredients in a stoichiometric ratio, put the above raw materials into a quartz glass tube or a high borosilicate glass tube, vacuum and seal, and then put the sealed quartz glass tube or high borosilicate glass tube into a swing furnace for full smelting. , rotate the hearth of the swing furnace to a vertical position, and after cooling, obtain an n-type bismuth telluride-based alloy crystal rod; cut the obtained n-type bismuth telluride-based alloy crystal rod into blocks, and put the blocks into equal channels The corner extrusion die is then placed in a hot pressing sintering furnace for sintering and extrusion to obtain an n-type bismuth telluride-based polycrystalline bulk thermoelectric material with a preferred orientation. The n-type bismuth telluride-based polycrystalline bulk thermoelectric material prepared by the invention has lower resistivity, higher Seebeck coefficient, lower thermal conductivity and higher dimensionless thermoelectric figure of merit.

Description

technical field [0001] The invention belongs to the technical field of bismuth telluride-based thermoelectric materials, and particularly relates to a preferentially oriented n-type bismuth telluride-based polycrystalline bulk thermoelectric material and a preparation method thereof. Background technique [0002] Bi produced by zone melting 2 Te 3 The base alloy has good thermoelectric properties, and its ZT value at room temperature is around 1, and has been widely used in the thermoelectric industry. However, Bi produced in the zone melting method 2 Te 3 In the base alloy, the Te(1)-Te(1) atomic layers are bound together only by the van der Waals force, and the machinability is poor. In order to solve the district melting Bi 2 Te 3 Due to the poor machinability of base alloys, many scientific research institutions and manufacturers use powder metallurgy technology to prepare polycrystalline Bi 2 Te 3 based thermoelectric materials, although p-type has made great pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B19/00
CPCC01B19/007C01P2002/72C01P2004/03C01P2006/80C01P2006/32C01P2006/40
Inventor 樊希安胡晓明罗自贵罗凡
Owner 湖北赛格瑞新能源科技有限公司