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N-type bismuth telluride-based thermoelectric material and preparation method and application thereof

A bismuth telluride-based, thermoelectric material technology, applied in thermoelectric device node lead wire materials, chemical instruments and methods, manufacturing/processing of thermoelectric devices, etc., can solve the problem of poor processing and production of micro-refrigeration devices, and increase the cost of thermoelectric devices , uneven performance distribution and other problems, to achieve the effect of industrial scale production, excellent mechanical performance and low cost

Active Publication Date: 2022-05-13
深圳热电新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Generally, the N-type bismuth telluride material produced by the zone melting method has the disadvantages of poor mechanical properties, low yield and uneven performance distribution, which greatly increases the cost of thermoelectric devices, and due to poor mechanical properties The reason is that the material is difficult to process and manufacture micro-refrigeration devices, which limits its application in civil and high-tech fields.

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  • N-type bismuth telluride-based thermoelectric material and preparation method and application thereof
  • N-type bismuth telluride-based thermoelectric material and preparation method and application thereof
  • N-type bismuth telluride-based thermoelectric material and preparation method and application thereof

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Embodiment 1

[0055] This embodiment provides an N-type bismuth telluride-based thermoelectric material and a preparation method thereof. The chemical formula of the N-type bismuth telluride-based thermoelectric material is Bi 1.8 Sb 0.2 Te 2.7 Se 0.3 ; Described preparation method comprises the steps:

[0056] (1) Bi particles, Sb particles, Te particles and Se particles with a purity of 99.99% are mixed in a molar ratio of 1.8:0.2:2.7:0.3, and the vacuum degree is 1×10 -5 Pa is smelted. During smelting, the temperature is raised to 500°C at a rate of 2°C / min for the first-stage smelting, and the holding time is 30 minutes, and then the temperature is raised to 950°C at a rate of 1°C / min for the second-stage smelting. The holding time is 3h, and the first alloy is obtained by cooling;

[0057] (2) After pulverizing the first alloy described in step (1) to a particle size of 150 mesh, spark plasma sintering at 450° C. and 60 MPa for 5 minutes to obtain a second alloy;

[0058] (3) Forg...

Embodiment 2

[0062] This embodiment provides an N-type bismuth telluride-based thermoelectric material and a preparation method thereof. The chemical formula of the N-type bismuth telluride-based thermoelectric material is Bi 1.85 Sb 0.15 Te 2.8 Se 0.2 ; Described preparation method comprises the steps:

[0063] (1) Bi particles, Sb particles, Te particles and Se particles with a purity of 99.95% were mixed in a molar ratio of 1.85:0.15:2.8:0.2, and the vacuum degree was 1×10 -4Pa is smelted. During smelting, the temperature is raised to 450°C at a rate of 3°C / min for the first-stage smelting, and the holding time is 50 minutes, and then the temperature is raised to 1000°C at a rate of 2°C / min for the second-stage smelting. The holding time is 4h, and the first alloy is obtained by cooling;

[0064] (2) After crushing the first alloy described in step (1) to a particle size of 300 mesh, spark plasma sintering at 480° C. and 40 MPa for 3 minutes to obtain a second alloy;

[0065] (3) T...

Embodiment 3

[0067] This embodiment provides an N-type bismuth telluride-based thermoelectric material and a preparation method thereof. The chemical formula of the N-type bismuth telluride-based thermoelectric material is Bi 1.82 Sb 0.18 Te 2.85 Se 0.15 ; Described preparation method comprises the steps:

[0068] (1) Bi particles, Sb particles, Te particles and Se particles with a purity of 99.95% were mixed in a molar ratio of 1.82:0.18:2.85:0.15, and the vacuum was 5×10 -5 Pa is smelted. During smelting, the temperature is raised to 550°C at a rate of 3°C / min for the first-stage smelting, and the holding time is 20 minutes, and then the temperature is raised to 900°C at a rate of 1.5°C / min for the second-stage smelting. The holding time is 5h, and the first alloy is obtained by cooling;

[0069] (2) After crushing the first alloy described in step (1) to a particle size of 30 mesh, spark plasma sintering at 400° C. and 50 MPa for 8 minutes to obtain a second alloy;

[0070] (3) The...

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Abstract

The invention provides an N-type bismuth telluride-based thermoelectric material and a preparation method and application thereof, the chemical formula of the N-type bismuth telluride-based thermoelectric material is Bi < 2-x > Sb < x > Te < 3-y > Se < y >, x is greater than or equal to 0.15 and less than or equal to 0.2, and y is greater than or equal to 0.15 and less than or equal to 0.3; a Bi raw material, a Sb raw material, a Te raw material and a Se raw material are mixed and then are smelted, crushed, sintered and forged to obtain the N-type bismuth telluride-based thermoelectric material. The crushing-sintering process and the forging and pressing process are combined, the mechanical performance and thermoelectric performance of the thermoelectric material are improved, the N-type bismuth telluride-based thermoelectric material is resistant to abrasion and not prone to deformation, the preparation method is simple, the requirement for equipment is low, cost is low, consumed time is short, and industrial large-scale production is facilitated.

Description

technical field [0001] The invention belongs to the technical field of thermoelectric materials, and particularly relates to an N-type bismuth telluride-based thermoelectric material and a preparation method and application thereof. Background technique [0002] With the improvement of industrial science and technology level in human society, the problem of energy shortage is becoming more and more serious. People are committed to finding new clean and sustainable energy sources that can replace traditional fossil energy. Research on the development of efficient and non-polluting energy conversion and utilization methods has always been one of the most popular research directions. Thermoelectric materials have a wide range of application prospects. In today's increasingly serious environmental pollution and energy crisis, the research on thermoelectric materials has strong practical significance. [0003] In terms of refrigeration systems, thermoelectric refrigeration devic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B19/00H01L35/16H01L35/34H10N10/01H10N10/852
CPCC01B19/007C01P2006/32C01P2006/40H10N10/852H10N10/01
Inventor 何佳清王天成王江舵
Owner 深圳热电新能源科技有限公司