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

A thermoelectric material and nanotechnology, applied in the field of hot materials, can solve the problems of poor thermoelectric performance and high thermal conductivity of thermoelectric materials, and achieve the effects of reducing lattice thermal conductivity, improving thermoelectric performance, and enhancing scattering

Inactive Publication Date: 2015-06-10
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

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  • Method for preparing (Bi0.8Sb0.2)2Te3 nano thermoelectric material
  • 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] (Bi of this embodiment 0.8 Sb 0.2 ) 2 Te 3 The preparation method of nano thermoelectric material comprises the following steps:

[0025] 1) Take Bi 2 Te 3 Powder material and Sb 2 Te 3 The powder material is passed through a 180-mesh sieve, and the sieved Bi 2 Te 3 Fine powder and Sb 2 Te 3 Fine powder is mixed according to the ratio that mass ratio is 4: 1, adopts SFM-1 planetary ball mill to carry out mechanical alloying treatment after, described mechanical alloying treatment is to adopt 500ml agate ball mill tank, 10mm agate grinding balls, the ratio of ball to material is 12:1, the rotating speed is 380rpm, the processing 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 canning and powder extraction operations need to be carried out under the protection of nitrogen atmosphere;

[0026] 2) Vapor deposition synthesis (Bi 0.8 Sb 0.2 ) 2 Te 3 Nanomaterials: Take 10g of the ball abrasive ob...

Embodiment 2

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

[0030] 1) Take Bi 2 Te 3 Powder material and Sb 2 Te 3 The powder material is passed through a 150-mesh sieve respectively, and the sieved Bi 2 Te 3 Fine powder and Sb 2 Te 3 Fine powder is mixed according to the ratio that mass ratio is 4: 1, adopts SFM-1 planetary ball mill to carry out mechanical alloying treatment after, described mechanical alloying treatment is to adopt 500ml agate ball mill tank, 12mm agate grinding balls, the ratio of ball to material is 12:1, the rotating speed is 420rpm, the processing 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 canning and powder extraction operations need to be carried out under the protection of nitrogen atmosphere;

[0031] 2) Vapor deposition synthesis (Bi 0.8 Sb 0.2 ) 2 Te 3 Nanomaterials: Take 10g of the bal...

Embodiment 3

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

[0035] 1) Take Bi 2 Te 3 Powder material and Sb 2 Te 3 The powder material is passed through a 180-mesh sieve, and the sieved Bi 2 Te 3 Fine powder and Sb 2 Te 3 Fine powder is mixed according to the ratio that mass ratio is 4: 1, adopts SFM-1 planetary ball mill to carry out mechanical alloying treatment after, described mechanical alloying treatment is to adopt 500ml agate ball mill tank, 8mm agate grinding balls, the ball-to-material ratio is 10:1, the rotating speed is 450rpm, the processing time is 12h, and the particle size is 0.06~2μm (Bi 0.8 Sb 0.2 ) 2 Te 3 Powder ball abrasive; among them, the canning and powder extraction operations need to be carried out under the protection of nitrogen atmosphere;

[0036] 2) Vapor deposition synthesis (Bi 0.8 Sb 0.2 ) 2 Te 3 Nanomaterials: Take 10g of the ball abrasive obtain...

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Abstract

The invention discloses a preparation method of (Bi0.8Sb0.2)2Te3 nanometer thermoelectric material, which includes: 1) mixing Bi2Te3 powder material and Sb2Te3 powder material and then performing mechanical alloying treatment to obtain ball abrasive; 2) taking less Part of the ball abrasive is put into an alumina burning boat in a vacuum atmosphere furnace, filled with a mixed gas of argon and hydrogen, and the temperature is raised to perform vapor deposition. The powder material deposited on the alumina plate is collected to obtain the vapor deposition material; 3) Ball mill After the material and vapor deposition material are mixed at a mass ratio of 5:1, they are quickly heated and pressed by high-frequency heating to obtain it. The preparation method of the present invention realizes the improvement and regulation of the electronic state density near the Fermi level, and improves the Seebeck coefficient of the thermoelectric material; by introducing nanoscale micro-defects, the scattering effect on phonons is enhanced, and the thermal energy of the thermoelectric material is reduced. The lattice thermal conductivity greatly improves the thermoelectric properties of the material.

Description

technical field [0001] The invention belongs to the technical field of hot spot materials, in particular to a kind of (Bi 0.8 Sb 0.2 ) 2 Te 3 Preparation method of nanometer 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. They are a new generation of green and environmentally friendly power generation equipment. They have the advantages of small size, low power consumption, no pollution, zero emissions during power generation, and no water consumption. Liquid circulation medium, without moving parts, can be made into any size and shape, and can be used in various occasions. Thermoelectric power generation has a wide range of applications in aerospace, military, field and marine operations, waste heat and waste heat u...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L35/34H10N10/01H10N10/852
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