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Bismuth telluride thermoelectric material and preparation method thereof

A technology of thermoelectric materials and bismuth telluride, which is applied in the field of thermoelectric materials, can solve the problems of difficult optimization of thermoelectric merits of electrical properties, difficulty in mass production, expensive equipment, etc., to achieve thermoelectric properties and mechanical properties, and a high degree of texture , promote the effect of lifting

Active Publication Date: 2021-03-16
SHENZHEN INST OF ADVANCED ELECTRONICS MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Bismuth telluride thermoelectric material and preparation method thereof
  • Bismuth telluride thermoelectric material and preparation method thereof
  • Bismuth telluride thermoelectric material and preparation method thereof

Examples

Experimental program
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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 increased at a rate of 100 ℃ per minute to a sintering temperature of 400 ℃, 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...

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; After that, 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 bismuth telluride thermoelectric material preparation method, which comprises: 1, weighing Bi, Te and Se elemental powder as raw materials according to a chemical formula Xw / Bi2Te2.7-wSe0.3 of an N-type bismuth telluride material, or weighing Bi, Sb and Te elemental powder as raw materials according to a chemical formula Xw / Bi0. 5-wSb1. 5Te3 of a P-type bismuth telluride material, wherein w is the stoichiometric ratio of the doping element X and is greater than or equal to 0 and less than or equal to 0.1;2, uniformly mixing the raw materials, and putting the mixture into a ball milling tank additionally provided with a plasma generator for high-energy ball milling; and 3, transferring the ball-milledpowder in the tank body into a sintering mold under inert gas for sintering in two times, and performing cooling to obtain the bismuth telluride thermoelectric material. The high-performance bismuthtelluride material is prepared by combining plasma ball milling and spark plasma sintering technologies for the first time, and the method has the advantages of being high in speed, controllable in powder component, low in energy consumption and 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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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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