A kind of bismuth telluride thermoelectric material and preparation method thereof

A thermoelectric material, bismuth telluride technology, applied in the field of thermoelectric materials, can solve the problems of difficulty in optimizing the thermoelectric figure of merit of electrical properties, difficult mass production, expensive equipment, etc., to achieve thermoelectric properties and mechanical properties, high textured degree. , the effect of promoting the improvement of the degree of texture

Active Publication Date: 2022-05-27
SHENZHEN INST OF ADVANCED ELECTRONICS MATERIALS +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, during the preparation of ultrafine powder by high energy ball milling, the high energy of the ball milling process makes it very easy to introduce impurities, and it is very easy to oxidize during the transfer of ultrafine powder, which makes it difficult to optimize the electrical properties and the final thermoelectric figure of merit.
Although the melting and spinning process can avoid the introduction of impurities, the equipment is expensive and it is difficult to achieve large-scale mass production

Method used

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  • A kind of bismuth telluride thermoelectric material and preparation method thereof
  • A kind of bismuth telluride thermoelectric material and preparation method thereof
  • A kind of bismuth telluride thermoelectric material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0028] According to the chemical formula Bi 0.5 Sb 1.5 Te 3 , Weigh the elemental raw materials Bi, Sb and Te (the purity of each element is ≥99.99%) according to the stoichiometric ratio, put the prepared raw materials into a stainless steel ball mill in a glove box filled with high-purity argon, and then carry out a plasma ball mill. High-speed ball milling, the speed of the ball mill is 500 rpm, the power of the plasma generator is set to 2kW, and the ball milling time is 60 minutes. After the powder is fully ground, a sintering mold with a diameter of 15mm is placed in the glove box, and then passed through the sealing device. It was transferred into a vacuum discharge plasma sintering furnace for sintering. The process conditions were that the temperature was raised to a sintering temperature of 400 ℃ at a rate of 100 ℃ per minute, the sintering pressure was kept at 50 MPa, and the sintering time was 15 min to obtain a columnar block material; The body was put into a mo...

Embodiment 2

[0030] According to the chemical formula Bi 2 Te 2.7 Se 0.3, Weigh the elemental raw materials Bi, Sb and Te (the purity of each element is ≥99.99%) according to the stoichiometric ratio, and put the prepared raw materials into the glove box filled with high-purity argon gas. A plasma ball mill is used for high-speed ball milling. The speed of the ball mill is 600 rpm, the power of the plasma generator is set to 1.5kW, and the ball milling time is 60 minutes. After fully grinding the powder, a sintering mold with a diameter of 15mm is placed in the glove box. Then, it is transferred into a vacuum discharge plasma sintering furnace through a sealing device for sintering. The process conditions are that the temperature is raised to a sintering temperature of 400 ℃ at a rate of 100 ℃ per minute, the sintering pressure is kept at 60 MPa, and the sintering time is 10 min to obtain a columnar block material; Afterwards, the columnar block was put into a mold with a diameter of 25 ...

Embodiment 3

[0032] According to the chemical formula Cu 0.002 Bi 0.498 Sb 1.5 Te 3 , Weigh the elemental raw materials Cu, Bi, Sb and Te (the purity of each element is ≥99.99%) according to the stoichiometric ratio, and put the prepared raw materials in a glove box filled with high-purity argon into a zirconia-lined ball mill jar, Then perform high-speed ball milling with a plasma ball mill. The speed of the ball mill is 800 rpm, the power of the plasma generator is set to 0.5 kW, and the ball milling time is 90 minutes. After fully grinding the powder, the glove box is filled with a sintered sinter with a diameter of 10 mm. The mold is then transferred into a vacuum discharge plasma sintering furnace through a sealing device for sintering. The process conditions are that the temperature is raised to a sintering temperature of 450°C at a rate of 100°C per minute, the sintering pressure is maintained at 50MPa, and the sintering time is 10min. After that, the columnar block was put into ...

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Abstract

The invention belongs to the technical field of thermoelectric materials, and discloses a preparation method of a bismuth telluride thermoelectric material, comprising the following steps: step 1, according to the chemical formula X of N-type bismuth telluride material w / Bi 2 Te 2.7‑ w Se 0.3 Weigh Bi, Te and Se elemental powders as raw materials, or according to the chemical formula X of P-type bismuth telluride material w / Bi 0.5‑w Sb 1.5 Te 3 Weigh Bi, Sb and Te elemental powders as raw materials, X is the doping element, w is the stoichiometric ratio of the doping element X, and the range is 0≤w≤0.1; step 2, mix the above raw materials evenly and place High-energy ball milling is carried out in the ball milling tank of the plasma generator; step 3, the powder in the tank after ball milling is transferred to a sintering mold under an inert gas for sintering, and the sintering is carried out twice, and after cooling, a bismuth telluride thermoelectric material is obtained. The invention combines plasma ball milling and discharge plasma sintering technology to prepare high-performance bismuth telluride material for the first time. The method has the advantages of fast speed, controllable powder composition, low energy consumption and is suitable for mass production.

Description

technical field [0001] The invention belongs to the technical field of thermoelectric materials, in particular to a bismuth telluride-based thermoelectric material with excellent thermoelectric properties and mechanical properties and a preparation method thereof. Background technique [0002] Thermoelectric materials are functional materials that directly convert thermal energy and electrical energy to each other by utilizing the Seebeck effect and Peltier effect of semiconductors. Thermoelectric refrigeration technology based on the Peltier effect has the characteristics of small size, no moving parts, no noise, and high precision. It has been widely used in local refrigeration and temperature control of electronic components in many fields such as microelectronics, computers and aerospace. In recent years, with the rapid development of the 5G industry, micro-thermoelectric cooling devices have become one of the key components necessary for thermal management of high-speed...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/51C04B35/626C04B35/645
CPCC04B35/547C04B35/62615C04B35/645C04B2235/42C04B2235/40C04B2235/666C04B2235/6581C04B2235/6562C04B2235/6567C04B2235/661C04B2235/96
Inventor 刘睿恒任琳琳曾小亮孙蓉
Owner SHENZHEN INST OF ADVANCED ELECTRONICS MATERIALS
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