Preparation method of bismuth telluride-based textured block thermoelectric material

A thermoelectric material, bismuth telluride-based technology, applied in the manufacture/processing of thermoelectric devices, thermoelectric device node lead-out materials, etc., can solve the problem of low thermoelectric figure of merit of materials, affecting material thermoelectric properties, and grain preferential orientation damage and other issues, to achieve the effects of good machining performance, lower production costs, good application prospects and industrialization prospects

Pending Publication Date: 2020-09-22
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Previously, many people have tried to prepare bismuth telluride-based thermoelectric materials by refining the particle size, combining hot pressing, spark plasma sintering, hot extrusion and other sintering processes. Although the mechanical properties have been

Method used

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  • Preparation method of bismuth telluride-based textured block thermoelectric material
  • Preparation method of bismuth telluride-based textured block thermoelectric material
  • Preparation method of bismuth telluride-based textured block thermoelectric material

Examples

Experimental program
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Embodiment 1

[0039] In this example, a bismuth telluride-based bulk thermoelectric material was prepared by combining zone melting process, layer-by-layer covering pressurization and vibration-assisted process, cold isostatic pressing process, vacuum sintering process and hot isostatic pressing process, as follows:

[0040] (1) The bismuth telluride alloy was prepared by the zone melting method, which was exactly the same as the process of preparing the bismuth telluride alloy by the zone melting method in the comparative example;

[0041] (2) Using the bismuth telluride alloy prepared in step (1) as the initial raw material, pulverize, grind, and sieve to obtain a powder material with a particle size in the range of 180-380um, and weigh an appropriate amount of the powder;

[0042] (3) Polish the surface of the carrier in the pressurized and vibration-assisted orientation device layer by layer, and attach a layer of epoxy glue with a thickness of 20um as the adhesive;

[0043] (4) Put the...

Embodiment 2

[0049] In this example, the bismuth telluride-based bulk thermoelectric material was prepared by combining zone melting process, layer-by-layer covering pressurization and vibration-assisted process, cold isostatic pressing process, vacuum sintering process and hot isostatic pressing process. Compared with the process of preparing a nearly completely dense and well-oriented bulk thermoelectric material in Example 1, the particle size of the powder material obtained by sieving only in step (2) is different, ranging from 120 to 180um. The other processes are the same as those in Example 1. 1, the process is exactly the same.

[0050] The nearly completely dense and well-oriented bulk thermoelectric material after HIP sintering was cut into strips of 2×2×9mm and discs of φ10×1.5mm, which were used to measure the electrical transport properties and thermal properties, respectively. transport properties.

Embodiment 3

[0052] In this embodiment, a bismuth telluride-based bulk thermoelectric material is prepared by combining zone melting process, layer-by-layer covering pressurization and vibration-assisted process, cold isostatic pressing process, vacuum sintering process and hot isostatic pressing process. Compared with the process of preparing a nearly completely dense and well-oriented bulk thermoelectric material in Example 1, the particle size of the powder material obtained by sieving in step (2) is different, ranging from 96 to 120um, and other processes Exactly the same process as in Example 1.

[0053] The nearly completely dense and well-oriented bulk thermoelectric material after HIP sintering was cut into strips of 2×2×9mm and discs of φ10×1.5mm, which were used to measure the electrical transport properties and thermal properties, respectively. transport properties.

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Abstract

The invention discloses a preparation method of a bismuth telluride-based block thermoelectric material. According to the invention, the method comprises the steps: combining a magnetic field auxiliary zone melting process, a layer-by-layer covering pressurization and vibration auxiliary orientation process, a cold isostatic pressing process, a vacuum sintering process and a hot isostatic pressingprocess; taking high-purity tellurium, bismuth, antimony, selenium and the like as raw materials; preparing a bismuth telluride crystal ingot by adopting a zone-melting method; crushing, grinding andsieving the crystal ingot, pressing sieved powder into a block material by utilizing a layer-by-layer covering pressurization and vibration-assisted orientation process, and finally preparing the textured block thermoelectric material which has good orientation and is close to complete compactness by combining a cold isostatic pressing process, a vacuum sintering process and a hot isostatic pressing process. According to the preparation method, the grain orientation of bismuth telluride can be remarkably improved, the obtained bismuth telluride-based block material has good thermoelectric performance and machining performance, and the preparation method is high in material utilization rate, easy to implement, high in preparation efficiency and good in application prospect.

Description

technical field [0001] The invention relates to the field of thermoelectric functional materials, in particular to a method for preparing bismuth telluride-based block thermoelectric materials with high strength, high performance and layered structure characteristics. Background technique [0002] Thermoelectric conversion materials are a class of functional materials that use the Seebeck effect (Seebeck) and Peltier effect (Peltier) of semiconductor materials to directly convert heat and electricity into each other. They are mainly used for thermoelectric power generation and thermoelectric refrigeration. With the increasingly prominent energy and environmental issues, thermoelectric conversion technology with the advantages of no pollution, no noise, small size, long life, precise control, safety and environmental protection is of great significance to alleviate energy crisis and environmental pollution problems. [0003] The performance of thermoelectric materials is usua...

Claims

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Application Information

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IPC IPC(8): H01L35/16H01L35/34
CPCH10N10/852H10N10/01
Inventor 蒋俊王鸿翔罗国强胡皓阳
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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