Process of preparing bismuth telluride-base thermoelectric material

A thermoelectric material, bismuth telluride-based technology, which is applied in the manufacture/processing of thermoelectric devices, the improvement of process efficiency, and the improvement of energy efficiency, etc., can solve the problems of reducing the ZT value of thermal conductivity, etc., and achieve stability and reliability. , the preparation process is simple, the effect of good application prospects

Inactive Publication Date: 2007-06-06
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, there have been a number of U.S. and European patents (US005610366A, US005929351A, EP0874406A3) on the preparation of Skutterudite system thermoelectric materials by SPS. Using the rapid densification characteristics of SPS technology, the grain growth of thermoelectric materials can be suppressed, so that the thermal conductivity Significantly reduce and increase the ZT value

Method used

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  • Process of preparing bismuth telluride-base thermoelectric material
  • Process of preparing bismuth telluride-base thermoelectric material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1: N-type material whose matrix component is Bi-Te-Se

[0021] First weigh 21.15 g Bi, 18.01 g Te, 0.84 g Se and 0.04 g BiCl respectively 3 Four kinds of powders were then placed in a high-energy ball milling device, the ratio of ball to material was 20:1, the rotational speed was 800 rpm; the ball milling time was 24 hours. The charging and reclaiming process needs to be carried out in a glove box, and the protection of inert gas such as argon is introduced to avoid the introduction of oxidation problems during the preparation process.

[0022] The powder is then loaded into a graphite mold and placed in the SPS furnace. The sintering process was carried out under vacuum conditions, and the sintering temperature was 400 °C; the heating rate was 50 °C / min; the holding time was 4 min; The applied pressure was 60 MPa; finally, the samples were taken out after natural cooling to around room temperature. The flexural strength of the obtained bulk material is 82MP...

Embodiment 2

[0023] Example 2: P-type material whose matrix component is Bi-Sb-Te

[0024]Firstly, three kinds of powders, such as 6.01 g Bi, 11.08 g Sb and 24.12 g Te, were weighed respectively, and then placed in a high-energy ball milling device with a ball-to-material ratio of 20:1 and a rotational speed of 600 rpm; the ball milling time was 30 hours. The charging and reclaiming process needs to be carried out in a glove box, and the protection of inert gas such as argon is introduced to avoid the introduction of oxidation problems during the preparation process.

[0025] The powder is then loaded into a graphite mold and placed in the SPS furnace. The sintering process was carried out under vacuum conditions, and the sintering temperature used was 360 °C; the heating rate was 50 °C / min; the holding time was 2 min; The applied pressure was 60 MPa; finally, the samples were taken out after natural cooling to around room temperature.

[0026] The flexural strength of the obtained bulk ...

Embodiment 3

[0027] Example 3: Powder material with initial particle size less than 200nm

[0028] First, according to the same chemical ratio as in Example 1, each element powder was weighed, and then placed in a high-energy ball milling device, the ball-to-material ratio was 20:1, the rotational speed was 1000 rpm, and the ball milling time was 20 hours. The charging and reclaiming process needs to be carried out in a glove box, and the protection of inert gas such as argon is introduced to avoid the introduction of oxidation problems during the preparation process.

[0029] The powder is then loaded into a graphite mold and placed in the SPS furnace. The sintering process was carried out under vacuum conditions, and the sintering temperature was 320 °C; the heating rate was 60 °C / min; the holding time was 2 min; The applied pressure was 40 MPa; finally, the samples were taken out after natural cooling to around room temperature.

[0030] The flexural strength of the obtained bulk mate...

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Abstract

The present invention discloses process of preparing bismuth telluride-base thermoelectric material. By means of controlling the technological parameters in mechanical alloying and SPS process to maintain the powder material size within certain range, and the fast densification of SPS technology to avoid the growth of crystal grain in the sintered block material, the present invention lowers the heat conductivity of the material while maintaining the electric performance unchanged basically, so as to improve the thermoelectric performance and mechanical performance, raise the utilization rate of the prepared material and improve the stability and reliability of the corresponding thermoelectric device. The bismuth telluride-base thermoelectric material preparing process combining mechanical alloying and SPS technology of the present invention is superior to available zone melting growth process, which is slow and needs precise control.

Description

technical field [0001] The invention relates to a thermoelectric material, in particular to a bismuth telluride (Bi 2 Te 3 )-based thermoelectric materials. Background technique [0002] Thermoelectric conversion is a technology that uses the Seebeck effect and Peltier effect of semiconductor materials to realize the direct mutual conversion of thermal energy and electrical energy. The index, that is, the ZT value (ZT=α 2 σT / κ, where α is the Seebeck coefficient, σ is the electrical conductivity, κ is the thermal conductivity, and T is the absolute temperature). In the 1950s and 1960s, Bi with excellent performance was discovered successively. 2 Te 3 base material, PbTe base material and SiGe alloy. Among them, the performance figures of merit ZT of PbTe-based materials and SiGe alloys reach their peaks in the medium and high temperature regions, respectively, and are usually used as thermoelectric power generation materials; while Bi 2 Te 3 The base alloy material h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/16B22F3/105H01L35/34
CPCY02P10/25
Inventor 蒋俊许高杰崔平李亚丽
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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