P-type bismuth telluride thermoelectric material and preparation method thereof

A thermoelectric material, bismuth telluride technology, applied in the direction of thermoelectric device junction lead-out material, etc., can solve the problems of limited improvement of ZT value, reduction of carrier mobility, and increase of material resistivity.

Active Publication Date: 2020-10-30
广西自贸区见炬科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the application of powder metallurgy to prepare p-type bismuth telluride-based thermoelectric materials reduces the thermal conductivity of the lattice, and at the same time, due to the introduction of a large number of grain boundaries and randomly oriented nanograins, the internal carrier mobility of the material will also be significantly reduced, resulting in The inevitable increase of material resistivity, the limited improvement of ZT value

Method used

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  • P-type bismuth telluride thermoelectric material and preparation method thereof
  • P-type bismuth telluride thermoelectric material and preparation method thereof
  • P-type bismuth telluride thermoelectric material and preparation method thereof

Examples

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Embodiment 1

[0036] Prepare the nominal composition as Bi 0.4 Sb 1.6 Te 3 P-type bismuth telluride thermoelectric material:

[0037](1) Using Bi and Sb with a particle size of 400 mesh and a purity of 99.99%, Te elemental powder with a particle size of 400 mesh and a purity of 99.999% as raw materials, the mass fractions of Bi, Si and Te are 12.6421wt%, 29.4701wt %, 57.8877wt% by weighing ingredients. The above-mentioned raw materials are packed in a stainless steel ball mill jar, and the stainless steel ball mill jar is placed in an Ar-protected glove box;

[0038] (2) Take out the stainless steel ball milling tank with the material loaded from the glove box, fill the ball milling tank with 5% H 2 Ar-H 2 mixed gas;

[0039] (3) Put the ball mill jar into a planetary ball mill for ball milling, each jar of ball mill raw material 15g, the ball-to-material ratio is 20:1. First mix the original powder for 1 hour under the condition of 100rmp / min. After the original powder is mixed even...

Embodiment 2

[0044] Prepare the nominal composition as Bi 0.4 Sb 1.6 Te 3 P-type bismuth telluride thermoelectric material:

[0045] (1) Using Bi and Sb with a particle size of 400 mesh and a purity of 99.99%, Te elemental powder with a particle size of 400 mesh and a purity of 99.999% as raw materials, the mass fractions of Bi, Si and Te are 12.6421wt%, 29.4701wt %, 57.8877wt% by weighing the ingredients, the above-mentioned raw materials are packed in the stainless steel ball mill tank, and the stainless steel ball ink tank is placed in the glove box protected by Ar gas;

[0046] (2) Take out the stainless steel ball milling tank with the material loaded from the glove box, fill the ball milling tank with 5% H 2 Ar-H 2 mixed gas;

[0047] (3) Put the ball mill jar into a planetary ball mill for ball milling, each jar of ball mill raw material 15g, the ball-to-material ratio is 20:1. First mix the original powder for 3 hours under the condition of 100rmp / min. After the original powd...

Embodiment 3

[0052] Prepare the nominal composition as Bi 0.4 Sb 1.6 Te 3 P-type bismuth telluride thermoelectric material:

[0053] (1) Using Bi and Sb with a particle size of 400 mesh and a purity of 99.99%, Te elemental powder with a particle size of 400 mesh and a purity of 99.999% as raw materials, the mass fractions of Bi, Si and Te are 12.6421wt%, 29.4701wt %, 57.8877wt% by weighing the ingredients, the above-mentioned raw materials are packed in the stainless steel ball mill tank, and the stainless steel ball ink tank is placed in the glove box protected by Ar gas;

[0054] (2) Take out the stainless steel ball milling tank with the material loaded from the glove box, fill the ball milling tank with 5% H 2 Ar-H 2 mixed gas;

[0055] (3) Put the ball mill jar into a planetary ball mill for ball milling, each jar of ball mill raw material 15g, the ball-to-material ratio is 20:1. First mix the original powder under the condition of 300rmp / min for 1h. After the original powder is...

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Abstract

The invention discloses a P-type bismuth telluride thermoelectric material and a preparation method thereof. The preparation method includes the steps that Bi, Sb and Te simple substance powder servesas raw materials, ball milling is conducted, then plasma sintering is conducted, a block material is prepared, and the P-type bismuth telluride thermoelectric material is obtained. The preparation method has the characteristics of simple process, short production period and high production efficiency, and the prepared modulated bismuth telluride-based thermoelectric block material is high in purity, low in thermal conductivity, high in electrical conductivity and high in mechanical strength.

Description

technical field [0001] The invention relates to the technical field of thermoelectric materials, in particular to a P-type bismuth telluride thermoelectric material and a preparation method thereof. Background technique [0002] In recent years, problems such as environmental pollution and energy shortage have become increasingly prominent, seriously restricting human survival and social development. Therefore, the development of clean energy and new energy technologies has become the focus of the international community. Among them, thermoelectric conversion technology, as an environmentally friendly new energy technology, can use the Seebeek effect and Peltier effect of thermoelectric materials to realize the direct mutual conversion of heat energy and electric energy. Bi 2 Te 3 Based compounds are currently the most mature and widely used class of thermoelectric materials, showing great potential in the fields of thermoelectric refrigeration and low-temperature thermoel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/515C04B35/622H01L35/16
CPCC04B35/547C04B35/622C04B2235/602C04B2235/6567C04B2235/6581C04B2235/666C04B2235/77C04B2235/96C04B2235/9607H10N10/852
Inventor 刘峰铭
Owner 广西自贸区见炬科技有限公司
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