Thermal treatment method for improving type N polycrystal Bi2Te3thermoelectricity capability

A heat treatment method and thermoelectric performance technology, which is applied in post-treatment, post-treatment details, polycrystalline material growth, etc., to achieve the effects of simple annealing process, strong practicability, and short synthesis and preparation time

Inactive Publication Date: 2008-07-16
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

Therefore, it is necessary to study the effect of lattice defects on the properties of Bi2Te3 materials prepared by MA and SPS, and there is no relevant literature report so far.

Method used

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  • Thermal treatment method for improving type N polycrystal Bi2Te3thermoelectricity capability
  • Thermal treatment method for improving type N polycrystal Bi2Te3thermoelectricity capability
  • Thermal treatment method for improving type N polycrystal Bi2Te3thermoelectricity capability

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Embodiment Construction

[0018] Bi was first prepared by the mechanical alloying method (MA) 2 Te 3 Precursor fine powder, the method is to mix high-purity Bi and Te elemental powders according to the atomic ratio of 2:3, put them together in a planetary high-energy ball mill for mechanical alloying under the protection of inert gas, and dry-mill the synthetic compound before wet Grind, and finally dry to get Bi 2 Te 3 based fine powder; the Bi 2 Te 3 The powder is prepared into a bulk material, the sintering temperature is 200-500°C, the holding time is 2-8min, and the pressure is 20-60MPa; after the surface of the sintered bulk material is polished, it is put into a glass tube, and then the glass The tube is evacuated, when the pressure inside the tube is less than 10 -3 After Pa, sealing treatment is carried out. Put the sealed glass tube of the sample into a box furnace for annealing treatment, heat it from room temperature to 100-400°C, keep it warm for 1-150 hours and then cool it with the...

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Abstract

A heat treatment method that increases the thermoelectric property of N-type polycrystal Bi2Te3 belongs to the technical field of energy materials. The method is divided into two parts: preparing of an N-type polycrystal Bi2Te3 thermoelectric material and annealing. At first, high purity Bi and Te are synthetized into Bi2Te3 compound powder by mechanical alloying, and an N-type polycrystal Bi2Te3 block material is prepared by spark plasma sintering, and then the Bi2Te3 block material is treated with vacuum annealing. Through the annealing treatment, the method increases the thermoelectric property of the N-type polycrystal Bi2Te3 and has the advantages of simple process, low cost and strong practicability, etc.

Description

technical field [0001] The invention belongs to the technical field of energy materials, and in particular provides a method for improving N-type polycrystalline Bi 2 Te 3 The heat treatment method for thermoelectric properties involves mechanical alloying (MA), spark plasma sintering (SPS) and annealing processes. Background technique [0002] Bi 2 Te 3 Base alloy is currently the thermoelectric material with the best performance at room temperature, and it is also one of the earliest and most mature thermoelectric materials. It has a large Seebeck coefficient and low thermal conductivity. The dimensionless thermoelectric figure of merit ZT at room temperature is around 1. At present, most of the refrigeration and low temperature temperature difference conversion electric energy components are made of this kind of material. Bi 2 Te 3 The crystal has a rhombohedral hexagonal sheet structure, and each unit cell is composed of three parts, and the atoms of each part are ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/46C30B1/00C30B33/02C22C29/00C22C1/05C22F1/16
Inventor 张波萍赵立东李敬锋刘玮书
Owner UNIV OF SCI & TECH BEIJING
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