Hot forging processing method for optimizing performance of polycrystal bismuth telluride-based thermoelectric alloy material

An alloy material and hot forging treatment technology, applied in metal processing equipment and other directions, can solve the problems of difficult to stabilize large-scale industrial production, complex process steps, etc., and achieve the effects of high room temperature thermoelectric figure of merit, simple process, and low thermal conductivity.

Active Publication Date: 2009-08-12
浙江电联矿业科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process steps are relatively complicated, and it is difficult to stabilize large-scale industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The bulk alloy obtained by hot pressing of reference example 1 once was put into a graphite mold with an inner diameter of 12.6 mm, and hot forged under vacuum: 400° C. for 60 minutes at a pressure of 80 MPa. Take out to obtain the final polycrystalline bismuth telluride-based bulk alloy.

[0022] The density of the samples detected by the Archimedes method was 98.8% of the theoretical density, and neither XRD nor scanning electron microscope found obvious texture inside the samples. The thermal conductivity κ of the polycrystalline block alloy at 300K is 0.88W m -1 K -1 , ZT value is 1.32. Compared with Reference Example 1, the ZT value was increased by 27%.

Embodiment 2

[0024] The bulk alloy obtained by hot pressing of reference example 1 once was put into a graphite mold with an inner diameter of 12.6mm, and hot forged and deformed under vacuum: holding pressure at 450°C for 30 minutes, and the pressure was 80MPa. Take out to obtain the final polycrystalline bismuth telluride-based bulk alloy.

[0025] The density of the samples detected by the Archimedes method was 99.1% of the theoretical density, and neither XRD nor scanning electron microscope found obvious texture inside the samples. The performance test shows that the thermal conductivity of the polycrystalline block alloy at 300K is 0.83W·m -1 K -1 , ZT value is 1.40. Compared with Reference Example 1, the ZT value was increased by 35%.

Embodiment 3

[0027] The bulk alloy obtained by hot pressing of reference example 1 once was put into a graphite mold with an inner diameter of 12.6mm, and hot forged and deformed under vacuum: holding pressure at 450°C for 30 minutes, and the pressure was 100MPa. Take out to obtain the final polycrystalline bismuth telluride-based bulk alloy.

[0028] The density of the samples detected by the Archimedes method was 99.3% of the theoretical density, and neither XRD nor scanning electron microscope found obvious texture inside the samples. The performance test shows that the thermal conductivity of the polycrystalline block alloy at 300K is 0.75W·m -1 K -1 , ZT value is 1.56. Compared with Reference Example 1, the ZT value was increased by 50%.

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Abstract

The invention discloses a hot forging processing method for optimizing performance of a polycrystalline bismuth telluride-based thermoelectric alloy material. The polycrystalline bismuth telluride-based blocky thermoelectric alloy, which is subjected to one-time hot press molding, is directly put into a graphite die for hot forging deformation and pressure maintaining so as to obtain the final thermoelectric alloy material. The inventive mechanism mainly comprises that: due to the hot forging deformation, the microstructure of the material is changed; stress induces the generation of point defect and nanometer structure inside the material, and meanwhile, triggers the recrystallization of the material for thinning crystal grains, thus prominently ameliorating thermoelectric performances that impact the material self. The invention has the characteristics of simple technology, low cost, short period and great suitability for large-scale production and application, and the manufactured bismuth telluride-based blocky thermoelectric alloy material has lower thermal conductivity and higher room temperature thermoelectric merit figure than the material prior to the hot forging deformation processing.

Description

technical field [0001] The invention relates to a method for optimizing the performance of a thermoelectric semiconductor material, in particular to a hot forging treatment method for optimizing the performance of a polycrystalline bismuth telluride-based thermoelectric alloy material. Background technique [0002] A thermoelectric material is a semiconductor material that directly converts electrical energy and thermal energy through the movement of carriers (electrons or holes). When there is a temperature difference between the two ends of the thermoelectric material, the thermoelectric material can convert heat energy into electrical energy output; or conversely, when a current is passed through the thermoelectric material, the thermoelectric material can convert electrical energy into heat energy, and one end releases heat while the other end absorbs heat. Thermoelectric materials have a wide range of application backgrounds in refrigeration or power generation. The pe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21J5/02
Inventor 赵新兵沈俊杰朱铁军曹一琦杨胜辉
Owner 浙江电联矿业科技发展有限公司
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