Processing method for improving performance of N-type bismuth telluride base powder sinter block thermoelectric material

A bismuth telluride-based, thermoelectric material technology, applied in the manufacture/processing of thermoelectric devices, can solve problems such as the difficulty of upgrading again, and achieve the effects of improved thermoelectric conversion efficiency, simple regulation, and improved production efficiency

Active Publication Date: 2015-03-11
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

However, most of the Z values ​​prepared by this method are around 1, and it is difficult to increase it again.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Take the block prepared in Reference Example 1, put it into a Ф20mm mold, and conduct low-speed thermal deformation at 500°C under pressure, control the change rate of the block along the height direction to 0.3mm / min, keep it for 2min, and stop applying pressure , kept at 500°C for 5 minutes. Then apply pressure again for low-speed thermal deformation, control the change rate of the block along the height direction to 0.3mm / min, and deform until the sample is completely filled in the mold to obtain a secondary thermal deformation sample. The ZT value of this sample at 500K is 0.87, which is 53% higher than that of the sintered sample in Reference Example 1.

Embodiment 2

[0028] Take the block prepared in Reference Example 1, put it into a Ф20mm mold, and conduct low-speed thermal deformation at 500°C under pressure, control the change rate of the block along the height direction to 0.3mm / min, keep it for 2min, and stop applying pressure , kept at 500°C for 5 minutes. Repeat the same operation, control the rate of change of the block along the height direction to 0.3mm / min, keep it for 2 minutes again, release the pressure, and keep warm at 500°C for 5 minutes. Finally, the rate of change of the block along the height direction is controlled to 0.3 mm / min, and the deformation is performed until the sample is completely filled in the mold, and three thermal deformation samples are obtained. It is measured that the ZT value of the sample is 0.92 at 500K, which is 61% higher than that of the sintered sample in Reference Example 1.

Embodiment 3

[0030] Take the block prepared in Reference Example 1, put it into a Ф20mm mold, and conduct low-speed thermal deformation at 500°C under pressure, control the change rate of the block along the height direction to 0.3mm / min, keep it for 2min, and stop applying pressure , kept at 500°C for 5 minutes. Repeat the same operation two more times, control the rate of change of the block along the height direction to 0.3mm / min, keep it for 2 minutes again, release the pressure, and keep warm at 500°C for 5 minutes. Finally, the rate of change of the block along the height direction is controlled to 0.3 mm / min, and the deformation is performed until the sample is completely filled in the mold to obtain four thermally deformed samples. It is measured that the ZT value of the sample at 500K is 1.00, which is 75.4% higher than that of the sintered sample in Reference Example 1.

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PUM

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Abstract

The invention discloses a processing method for improving the performance of an N-type bismuth telluride base powder sinter block thermoelectric material. The method comprises the steps of placing an N-type bismuth telluride base block formed by thermal pressing in a mold, performing low-speed thermal deformation at 500-550 DEG C and under a pressure condition, controlling a change rate of the block in a height direction to be 0.2-3mm / min for 1-10min, then removing the pressure, performing thermal insulation for 2-60min, and repeating the procedure for at least one time. According to the processing method for improving the performance of the N-type bismuth telluride base sinter block thermoelectric material, the thermoelectric performance of the N-type bismuth telluride base material is greatly improved by using a repeated low-speed thermal deformation induction technology, and an optimal value can reach 1.2 which is the reported maximum value of an N-type material in the world at present.

Description

technical field [0001] The invention relates to the technical field of thermoelectric materials, in particular to a processing method for improving the performance of N-type bismuth telluride-based powder sintered block thermoelectric materials. Background technique [0002] Thermoelectric materials are new energy materials that can directly convert heat energy and electric energy. Its mechanism is based on the three thermoelectric conversion effects of Seebeck effect, Patel effect and Thomson effect. In the past few decades, due to the increasing attention to energy issues, the research on thermoelectric materials has entered a new stage. Using P-type and N-type semiconductor thermoelectric materials in series can make thermoelectric refrigeration and power generation devices. Thermoelectric devices have many advantages such as no pollution, no noise, no moving parts, and no vibration. The conversion efficiency of a thermoelectric device mainly depends on the dimensionles...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L35/34
Inventor 赵新兵王亚光朱铁军胡利鹏唐正龙徐钊君
Owner 浙江电联矿业科技发展有限公司
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