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High-pressure sintering preparation method of high-densification high-performance nano crystal block thermoelectric material

A thermoelectric material, high-pressure sintering technology, applied in the manufacture/processing of thermoelectric devices, junction lead-out materials of thermoelectric devices, nanotechnology and other directions, can solve the problems of high thermoelectric figure of merit, low thermal conductivity, etc. High density, short time effect

Inactive Publication Date: 2009-10-07
YANSHAN UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0005] In order to overcome the current situation that the existing technology cannot prepare thermoelectric materials with high thermoelectric conversion efficiency, the present invention provides a high-pressure sintering preparation method of high-density and high-performance nanocrystalline bulk thermoelectric materials. The bulk thermoelectric materials obtained by the invention have Low thermal conductivity and high thermoelectric figure of merit (higher than 2)

Method used

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  • High-pressure sintering preparation method of high-densification high-performance nano crystal block thermoelectric material
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  • High-pressure sintering preparation method of high-densification high-performance nano crystal block thermoelectric material

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Effect test

Embodiment 1

[0052] Embodiment 1: high performance binary Bi 2 Te 3 Preparation method of alloy N-type nanocrystalline bulk material 1

[0053] (1) Using elemental Bi (99.999%) and Te (99.999%) as raw materials, according to Bi 2 Te 3 Weigh 20g of the stoichiometric ratio, put it into a tungsten carbide ball mill jar, and use alcohol as a process control agent to prepare nanocrystalline Bi by ball milling under the protection of argon. 2 Te 3 alloy powder. The ball mill was a Pulveristte 4 planetary high-energy ball mill from FRITSCH, Germany, and the relevant parameters were as follows: ball-to-material ratio: 20:1, the rotation speed of the large disk was 300 rpm, the rotation speed of the small disk was 900 rpm, and the ball milling time was 100 hours. The average grain size was estimated to be about 10 nm using X-ray diffraction spectroscopy.

[0054] (2) The prepared nanopowder is vacuum-dried in the transition chamber of the glove box. And in the glove box, use a mold with a d...

Embodiment 2

[0057] Embodiment 2: high performance binary Bi 2 Te 3 Preparation method of alloy N-type nanocrystalline bulk material 2

[0058] (1) Using elemental Bi (99.999%) and Te (99.999%) as raw materials, according to Bi 2 Te 3 Weigh 20g of the stoichiometric ratio and seal it in a quartz tube under vacuum. Put the quartz tube into the electric furnace to melt Bi 2 Te 3 Alloy material, heating rate: 20°C / min; melting temperature: 750°C; holding time: 15 hours; cooling rate: 2°C / min. The melted Bi 2 Te 3 After the alloy material is pulverized, it is put into a tungsten carbide ball mill tank, and alcohol is used as a process control agent, and the nanocrystalline Bi is prepared by ball milling under the protection of argon. 2 Te 3 alloy powder. The ball mill was a Pulveristte 4 planetary high-energy ball mill from FRITSCH, Germany, and the relevant parameters were as follows: ball-to-material ratio: 20:1, the rotation speed of the large disk was 300 rpm, the rotation speed ...

Embodiment 3

[0062] Embodiment 3: high performance ternary Bi 0.5 Sb 1.5 Te3 Preparation of Alloy P-type Nanocrystalline Bulk Materials

[0063] (1) Using elemental Bi (99.999%), Sb (99.999%) and Te (99.999%) as raw materials, according to Bi 0.5 Sb 1.5 Te 3 Weigh 20g of the stoichiometric ratio, put it into a tungsten carbide ball mill jar, and use alcohol as a process control agent to prepare nanocrystalline Bi by ball milling under the protection of argon. 0.5 Sb 1.5 Te 3 alloy powder. The ball mill was a Pulveristte 4 planetary high-energy ball mill from FRITSCH, Germany, and the relevant parameters were as follows: ball-to-material ratio: 20:1, the rotation speed of the large disk was 300 rpm, the rotation speed of the small disk was 900 rpm, and the ball milling time was 100 hours. The average grain size was estimated to be about 17 nm using X-ray diffraction spectroscopy.

[0064] (2) The prepared nanopowder is vacuum-dried in the transition chamber of the glove box. And in...

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Abstract

The invention discloses a high-pressure sintering preparation method of high-densification high-performance nano crystal block thermoelectric material, characterized in that: (1) preparing nano crystal alloy powder using a ball milling method, with crystal grain size of 5nm-30nm; (2) preparing nano crystal block thermoelectric material using the high-pressure sintering technique, at pressure range of 0.8GPa-6GPa and sintering temperature range of 0.25-0.8T[melting point] for sintering time range of 10-120 minutes and the relative density of the obtained nano crystal block thermoelectric material is 90-100% and the average grain size is 10-50 nm. The technique is simple and the zero dimension thermoelectricity Q-value (ZT) is above 2.0. The prearation method increase the density of the nano crystal block thermoelectric material on the basis of ensuring the material with high thermoelectricity with good industrialization foreground.

Description

technical field [0001] The invention relates to the field of thermoelectric materials, in particular to a high-pressure sintering preparation method of high-densification and high-performance nanocrystalline bulk thermoelectric materials. Background technique [0002] Due to the needs of environmental protection, waste heat utilization, industrial and military applications, etc., finding high-efficiency, non-polluting energy conversion methods has become an urgent problem in today's energy science. Thermoelectric materials, also known as thermoelectric materials, are functional materials that can realize direct mutual conversion between thermal energy and electrical energy. Devices made of thermoelectric materials have outstanding advantages such as small size, no noise, no pollution, no moving parts, and maintenance-free. Therefore, thermoelectric materials have extremely important application prospects in thermoelectric cooling and thermoelectric power generation. [0003...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/16B22F9/04B22F1/054
CPCB22F3/16B22F2009/041H01L35/34H01L35/16B22F3/14B22F1/0018B22F9/04B82Y30/00B22F1/054H10N10/852H10N10/01
Inventor 田永君于凤荣于栋利张建军徐波柳忠元何巨龙
Owner YANSHAN UNIV
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