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Method for optimizing structure and performances of N-type Bi2Te3-based thermoelectric material

A kind of thermoelectric material, N-type technology, applied in the direction of metal selenide/telluride, binary selenium/telluride compound, etc., can solve the problems of complex process, high investment cost of production equipment, unsuitable for large-scale commercial production, etc., to achieve Optimization of thermoelectric properties, optimization of thermoelectric and mechanical properties, effect of mechanical properties improvement

Inactive Publication Date: 2020-01-03
FIRST DESIGN & RES INST MI CHINA
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Problems solved by technology

[0005] Although the above-mentioned methods can optimize the thermoelectric properties of materials, the processes involved are complicated and the investment cost of production equipment is high, which is not suitable for large-scale commercial production.

Method used

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  • Method for optimizing structure and performances of N-type Bi2Te3-based thermoelectric material
  • Method for optimizing structure and performances of N-type Bi2Te3-based thermoelectric material
  • Method for optimizing structure and performances of N-type Bi2Te3-based thermoelectric material

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Embodiment Construction

[0026] An optimized N-type Bi 2 Te 3 The structure and performance method of the base thermoelectric material, the specific steps are as follows:

[0027] (1) N-type Bi 2 Te 2.7 Se 0.3 Alloy ingots are continuously crushed on the mechanical pulverizer for 30s, 60s, or 90s respectively, and then sieved with 75 meshes to remove coarse particle materials and make alloy powder;

[0028] Among them, the mechanical pulverizer adopts a small mechanical pulverizer model JYL-C012E; the N-type Bi that is put into the mechanical pulverizer 2 Te 2.7 Se 0.3 The mass of the alloy ingot is 30g, and the grain size is 4mm-6mm.

[0029] (2) The prepared N-type Bi 2 Te 2.7 Se 0.3 The alloy powder is placed in a graphite mold, and the bulk thermoelectric material is prepared by SPS sintering technology. Among them, the SPS sintering process is: the sintering pressure is 40MPa, the temperature is raised to 400°C at a heating rate of 50°C / min, and the pressure is kept for 5 minutes, and ...

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Abstract

The invention discloses a method for optimizing the structure and performances of an N-type Bi2Te3-based thermoelectric material. The method comprises the following steps: 1, pulverizing: continuouslycrushing N-type Bi2Te3-based alloy cast ingots, prepared by a melting process, in a mechanical crushing manner for a preset time, and sieving the crushed cast ingots by a 75 mesh sieve to obtain an alloy powder; and 2, sintering: sintering the alloy powder obtained by pulverizing to obtain sintered block alloy. The mechanical crushing time in the pulverizing process is simply controlled to realize the regulation of the orientation and structure of the sintered block and the donor-like effect introduced into the material, so the electroacoustic transmission performance and mechanical properties of the material are effectively regulated.

Description

technical field [0001] The invention relates to an optimized N-type Bi 2 Te 3 Methods for the structure and properties of thermoelectric materials. Background technique [0002] The energy and environmental crisis has prompted human beings to carry out a lot of research work in the search for new alternative energy and energy conversion technologies. In recent years, with the continuous deepening and improvement of the thermoelectric theory system and the continuous improvement and updating of the material preparation process, thermoelectric conversion technology and thermoelectric materials have increasingly attracted the attention of countries all over the world. Thermoelectric conversion technology can directly convert thermal energy and electrical energy into each other: according to the Seebeck effect, thermoelectric devices can directly convert thermal energy into electrical energy, which is mainly used in the field of thermoelectric power generation; according to th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B19/04
CPCC01B19/007C01P2002/72C01P2004/03C01P2004/61
Inventor 王小宇郜业见丰大顺
Owner FIRST DESIGN & RES INST MI CHINA
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