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Method for preparing (Bi0.8Sb0.2)2Te3 nano thermoelectric material

A thermoelectric material and nanotechnology, which is applied in the manufacture/processing of thermoelectric devices, thermoelectric device node lead-out materials, nanotechnology, etc., can solve the problems of high thermal conductivity and poor thermoelectric performance of thermoelectric materials, and achieve improved thermoelectric performance , reduce lattice thermal conductivity, improve the effect of Seebeck coefficient

Inactive Publication Date: 2014-02-05
HENAN UNIV OF URBAN CONSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The object of the present invention is to provide a kind of (Bi 0.8 Sb 0.2 ) 2 Te 3 A method for preparing nanometer thermoelectric materials, which solves the problems of high thermal conductivity and poor thermoelectric performance of thermoelectric materials obtained by existing preparation methods

Method used

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  • Method for preparing (Bi0.8Sb0.2)2Te3 nano thermoelectric material
  • Method for preparing (Bi0.8Sb0.2)2Te3 nano thermoelectric material

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Embodiment 1

[0024] The (Bi 0.8 Sb 0.2 ) 2 Te 3 The preparation method of nano thermoelectric material includes the following steps:

[0025] 1) Take Bi 2 Te 3 Powder materials and Sb 2 Te 3 Powder materials, respectively pass through a 180-mesh sieve, and the Bi 2 Te 3 Fine powder and Sb 2 Te 3 The fine powder is mixed according to a mass ratio of 4:1, and then mechanically alloyed using a SFM-1 planetary ball mill. The mechanical alloying process uses a 500ml agate ball mill tank. 10mm agate grinding balls, the ball-to-battery ratio is 12:1, the rotating speed is 380rpm, the treatment time is 18h, and the particle size is 0.06~2μm (Bi 0.8 Sb 0.2 ) 2 Te 3 Powder ball abrasive; among them, the operation of filling and taking powder needs to be carried out under the protection of nitrogen atmosphere;

[0026] 2) Use vacuum atmosphere tube furnace for vapor deposition synthesis (Bi 0.8 Sb 0.2 ) 2 Te 3 Nanomaterials: Take 10g of the ball abrasive obtained in step 1) and put it into the alumina burn...

Embodiment 2

[0029] The (Bi 0.8 Sb 0.2 ) 2 Te 3 The preparation method of nano thermoelectric material includes the following steps:

[0030] 1) Take Bi 2 Te 3 Powder materials and Sb 2 Te 3 Powder materials, respectively pass through a 150-mesh sieve, and the sieved Bi 2 Te 3 Fine powder and Sb 2 Te 3 The fine powder is mixed according to a mass ratio of 4:1, and then mechanically alloyed using a SFM-1 planetary ball mill. The mechanical alloying process uses a 500ml agate ball mill tank. The 12mm agate grinding ball, the ball-to-battery ratio is 12:1, the rotation speed is 420rpm, the treatment time is 16h, and the particle size is 0.06~2μm (Bi 0.8 Sb 0.2 ) 2 Te 3 Powder ball abrasive; among them, the operation of filling and taking powder needs to be carried out under the protection of nitrogen atmosphere;

[0031] 2) Use vacuum atmosphere tube furnace for vapor deposition synthesis (Bi 0.8 Sb 0.2 ) 2 Te 3 Nanomaterials: Take 10g of the ball abrasive obtained in step 1) and put it into the al...

Embodiment 3

[0034] The (Bi 0.8 Sb 0.2 ) 2 Te 3 The preparation method of nano thermoelectric material includes the following steps:

[0035] 1) Take Bi 2 Te 3 Powder materials and Sb 2 Te 3 Powder materials, respectively pass through a 180-mesh sieve, and the Bi 2 Te 3 Fine powder and Sb 2 Te 3 The fine powder is mixed according to a mass ratio of 4:1, and then mechanically alloyed using a SFM-1 planetary ball mill. The mechanical alloying process uses a 500ml agate ball mill tank. 8mm agate grinding balls, ball-to-battery ratio of 10:1, rotating speed 450rpm, processing time of 12h, and (Bi) with a particle size of 0.06~2μm 0.8 Sb 0.2 ) 2 Te 3 Powder ball abrasive; among them, the operation of filling and taking powder needs to be carried out under the protection of nitrogen atmosphere;

[0036] 2) Use vacuum atmosphere tube furnace for vapor deposition synthesis (Bi 0.8 Sb 0.2 ) 2 Te 3 Nanomaterials: Take 10g of the ball abrasive obtained in step 1) and put it into the alumina burning boat. P...

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Abstract

The invention discloses a method for preparing a (Bi0.8Sb0.2)2Te3 nano thermoelectric material. The method comprises the following steps of (1) mixing a Bi2Te3 powder material and a Sb2Te3 powder material, and performing mechanical alloying treatment, thereby obtaining a ball-milling material; (2) taking a small part of ball-milling material, putting the ball-milling material into an alumina burning boat of a vacuum atmosphere furnace, filling mixed gas of argon and hydrogen, raising the temperature for performing vapor deposition, and collecting a powder material deposited on an alumina plate, thereby obtaining a vapor deposition material; (3) mixing the ball-milling material and the vapor deposition material according to a mass ratio of 5:1, and performing high-frequency heating and rapid hot press molding, thereby obtaining the (Bi0.8Sb0.2)2Te3 nano thermoelectric material. According to the preparation method, the electronic state density nearby a Fermi level is improved and controlled, and a Seebeck coefficient of the thermoelectric material is improved. Moreover, with nano-scale micro-defects, a scattering effect on phonons is enhanced, the lattice thermal conductivity of the thermoelectric material is reduced, and the thermoelectric performance of the material is greatly improved.

Description

Technical field [0001] The present invention belongs to the technical field of hot materials, and specifically relates to a (Bi 0.8 Sb 0.2 ) 2 Te 3 Preparation method of nano thermoelectric material. Background technique [0002] Thermoelectric materials can cause carrier migration through temperature difference, and directly convert thermal energy into electrical energy. Thermoelectric devices made of hot spot materials can use temperature difference to generate electricity. It is a new generation of green and environmentally friendly power generation equipment. It has the advantages of small size, low power consumption, no pollution, zero emissions during power generation, and no water consumption. The liquid circulating medium has no moving parts and can be made into any size and shape for various occasions. Thermoelectric power generation has a wide range of applications in aerospace, military, field and ocean operations, waste heat and waste heat utilization, and solar ener...

Claims

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Application Information

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IPC IPC(8): C22C1/10H01L35/34H01L35/16B82Y30/00B82Y40/00
Inventor 李山鹰姜欣张崭李文琪赵海鹏杜玲枝刘向云
Owner HENAN UNIV OF URBAN CONSTR
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