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Preparation method of preferentially oriented n-type bismuth telluride-based polycrystalline bulk thermoelectric material

A bismuth telluride-based, preferred orientation technology, applied in chemical instruments and methods, selenium/tellurium compounds, metal selenides/tellurides, etc., can solve the problem that it is difficult to prepare powders with uniform particle size, and achieve dimensionless thermoelectric optimization High value, stable performance and good repeatability

Active Publication Date: 2019-07-12
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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  • Preparation method of preferentially oriented n-type bismuth telluride-based polycrystalline bulk thermoelectric material
  • Preparation method of preferentially oriented n-type bismuth telluride-based polycrystalline bulk thermoelectric material
  • Preparation method of preferentially oriented n-type bismuth telluride-based polycrystalline bulk thermoelectric material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

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

[0033] Put the above-mentioned raw materials into a quartz glass tube or a high borosilicate glass tube and vacuum seal it, then put the sealed quartz glass tube or high borosilicate glass tube 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 slowly cooled to obtain a high-density n-type bismuth telluride-based alloy ingot;

[0034] Cut the obtained n-type bismuth telluride-based alloy crystal bar into blocks, put the blocks into an equal-channel corner extrus...

Embodiment 2

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

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

[0043] Put the above-mentioned raw materials into a quartz glass tube or a high borosilicate glass tube and vacuum seal it, then put the sealed quartz glass tube or high borosilicate glass tube 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 slowly cooled to obtain a high-density n-type bismuth telluride-based alloy ingot;

[0044] Cut the obtained n-type bismuth telluride-based alloy crystal bar into blocks, put the blocks into an equal-channel corner extrusio...

Embodiment 3

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

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

[0054] Put the above-mentioned raw materials into a quartz glass tube or a high borosilicate glass tube and vacuum seal it, then put the sealed quartz glass tube or high borosilicate glass tube 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 slowly cooled to obtain a high-density n-type bismuth telluride-based alloy ingot;

[0055] Cut the obtained n-type bismuth telluride-based alloy crystal bar into blocks, put the blocks into an equal-channel corner extrusi...

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Abstract

The invention provides a preparation method of a preferentially oriented n-type bismuth telluride-based polycrystalline bulk thermoelectric material, comprising the following steps: using Bi, Te and Se elemental powders as raw materials, weighing the ingredients according to Bi2Te3-xSex stoichiometric ratio, placing the above raw materials into a quartz glass tube or a high borosilicate glass tubeand vacuum-sealing, putting the sealed quartz glass tube or the high borosilicate glass tube into a rocking furnace and fully smelting, rotating a hearth of the rocking furnace to a vertical positionafter the smelting, and cooling to prepare an n-type bismuth telluride-based alloy ingot; cutting the prepared n-type bismuth telluride-based alloy ingot into blocks, and placing the blocks into an equal channel angular extrusion die and sintering and extruding in a hot-pressed sintering furnace so as to obtain the preferentially oriented n-type bismuth telluride-based polycrystalline bulk thermoelectric material. The prepared n-type bismuth telluride-based polycrystalline bulk thermoelectric material has low resistivity, high Seebeck coefficient, low thermal conductivity and high dimensionless thermoelectric figure of merit.

Description

technical field [0001] The invention belongs to the technical field of bismuth telluride-based thermoelectric materials, and in particular relates to a preferred orientation n-type bismuth telluride-based polycrystalline block thermoelectric material and a preparation method thereof. Background technique [0002] Bi produced by zone smelting 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. But the Bi produced in the zone smelting process 2 Te 3 In the base alloy, the Te(1)-Te(1) atomic layers are only bonded together by van der Waals force, and the machinability is poor. In order to solve the zone melting Bi 2 Te 3 Due to the poor machinability of base alloys, many scientific research institutions and manufacturers adopt powder metallurgy technology to prepare polycrystalline Bi 2 Te 3 Based thermoelectric materials, although p-type has made great progr...

Claims

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Application Information

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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
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