High-performance thermoelectric composite material and preparation method thereof

A composite material and thermoelectric technology, which is applied in the direction of thermoelectric device lead-out wire materials, thermoelectric device manufacturing/processing, etc., can solve the problems of low thermoelectric performance and low mechanical strength at high temperature end, so as to improve thermoelectric performance and reduce crystal lattice Thermal conductivity, effect of improving process workability

Active Publication Date: 2012-02-01
中科西卡思(苏州)科技发展有限公司
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  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a thermoelectric device with high mechanical strength and high thermoelectric performance for commercial bismuth telluride-based thermoelectric devices that mostly use crystals as thermoelectric elements, which have problems of low mechanical strength and low thermoelectric performance at high temperature end. Composite material and its preparation method

Method used

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  • High-performance thermoelectric composite material and preparation method thereof
  • High-performance thermoelectric composite material and preparation method thereof
  • High-performance thermoelectric composite material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1: component is Bi 2 Se 0.3 Te 2.7 n-type matrix powder

[0031] Firstly, oriented polycrystalline rods of the above components were obtained by zone melting growth. The zone melting growth conditions were melting temperature 700°C, temperature gradient 25°C / mm, and growth rate 2.5mm / h. After the surface part of the polycrystalline rod is removed, it is crushed and sieved, and a steel container is used as a crushing tool, and the crushing process is protected by an inert atmosphere such as argon. After crushing, use a standard nylon sieve to sieve the powder to obtain the initial powder with the required particle size distribution, and select the powder with a particle size of 1-100 μm.

[0032] Using a graphite mold, SPS sintering was performed under vacuum conditions. The sintering temperature is 440°C, the heating rate is 100°C / min, the holding time is 10min, and the applied pressure is 60MP. The bending strength of the obtained sintered body is close...

Embodiment 2

[0033] Embodiment 2: component is Bi 2 Se 0.3 Te 2.7 n-type matrix powder+0.4wt.%Al 2 o 3 nano powder

[0034] Firstly, oriented polycrystalline rods of the above components were obtained by zone melting growth. The zone melting growth conditions were melting temperature 700°C, temperature gradient 25°C / mm, and growth rate 2.5mm / h. After the surface part of the polycrystalline rod is removed, it is crushed and sieved, and a steel container is used as a crushing tool, and the crushing process is protected by an inert atmosphere such as argon. After crushing, use a standard nylon sieve to sieve the powder to obtain the initial powder with the required particle size distribution, and select the powder with a particle size of 1-100um.

[0035] Ultrasonic mixing of the matrix powder and metal oxide nanopowder obtained above, the liquid medium used for ultrasonic mixing is ethanol solution, polyethylene glycol is used as a dispersant, and ultrasonic mixing is performed for 0.5h...

Embodiment 3

[0037] Embodiment 3: component is Bi 2 Se 0.3 Te 2.7 n-type matrix powder+0.2wt.%Al 2 o 3 nano powder

[0038] Firstly, oriented polycrystalline rods of the above components were obtained by zone melting growth. The zone melting growth conditions were melting temperature 650°C, temperature gradient 20°C / mm, and growth rate 3mm / h. After the surface part of the polycrystalline rod is removed, it is crushed and sieved, and a steel container is used as a crushing tool, and the crushing process is protected by an inert atmosphere such as argon. After crushing, use a standard nylon sieve to sieve the powder to obtain the initial powder with the required particle size distribution, and select the powder with a particle size of 1-100um.

[0039] Ultrasonic mixing of the matrix powder and metal oxide nano-powder obtained above, the liquid medium used for ultrasonic mixing is ethanol, polyethylene glycol is used as a dispersant, and ultrasonic mixing is carried out for 2 hours to o...

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Abstract

The invention relates to a high-performance thermoelectric composite material and a preparation method thereof, belonging to the field of thermoelectric materials. The composite material consists of two phases. A first phase is n-type Bi2Te3-Bi2Se3 or p-type Bi2Te3-Sb2Te3, and a second phase is nanometer powder of a metallic oxide. The nanometer powder of the metallic oxide accounts for 0.05-10% in terms of the total weight of the thermoelectric composite material. According to the preparation method provided by the invention, the n-type Bi2Te3-Bi2Se3 or p-type Bi2Te3-Sb2Te3 powder is ultrasonically mixed with the nanometer oxide, and discharge plasma sintering is carried out on the mixture to obtain a dense block material. Compared with the bismuth-telluride-based thermoelectric base material, under the condition that the electric conductivity of the thermoelectric base material is maintained to be unchanged basically in the invention, the high-performance thermoelectric composite material, provided by the invention, achieves the advantages of obviously reduced lattice heat conductivity and increased Seeback coefficient, and therefore the thermoelectric performance of the material can be greatly improved.

Description

technical field [0001] The invention relates to a high-performance thermoelectric composite material and a preparation method thereof, belonging to the field of thermoelectric materials. Background technique [0002] Thermoelectric conversion technology is a technology that uses the Seebeck effect of materials to directly convert heat energy into electrical energy, or uses the Peltier effect of materials for refrigeration. It has no moving parts, high reliability, long life, Environmentally friendly and other characteristics, it can be widely used in waste heat power generation, aerospace, military equipment, home appliances and other fields. The thermoelectric conversion efficiency mainly depends on the dimensionless thermoelectric performance factor ZT of the material (ZT=S 2 σT / κ, where S is the Seebeck coefficient, σ is the electrical conductivity, κ is the thermal conductivity, and T is the absolute temperature). The higher the ZT value of the material, the higher the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L35/16H01L35/22H01L35/34
Inventor 江莞李菲陈立东黄向阳孙正亮
Owner 中科西卡思(苏州)科技发展有限公司
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