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P-type (Bi0.25Sb0.75)2Te3/CeyFe4Sb12(y=0.8-1.2)-based bulk gradient thermoelectric material and preparation method thereof

A thermoelectric material, 2te3 technology, applied in the direction of thermoelectric device node lead wire material, thermoelectric device manufacturing/processing, etc., to achieve the effect of simple sintering process and high bonding strength

Inactive Publication Date: 2010-08-04
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, how to prepare gradient materials with clean interfaces and high bonding strength has been rarely studied, especially in (Bi 0.25 Sb 0.75 ) 2 Te 3 / C y Fe 4 Sb 12 (y=0.8-1.2) The invention of the preparation of gradient thermoelectric materials has hardly been reported

Method used

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  • P-type (Bi0.25Sb0.75)2Te3/CeyFe4Sb12(y=0.8-1.2)-based bulk gradient thermoelectric material and preparation method thereof
  • P-type (Bi0.25Sb0.75)2Te3/CeyFe4Sb12(y=0.8-1.2)-based bulk gradient thermoelectric material and preparation method thereof
  • P-type (Bi0.25Sb0.75)2Te3/CeyFe4Sb12(y=0.8-1.2)-based bulk gradient thermoelectric material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0020] 1) Ce 0.8 Fe 4 Sb 12 The preparation of the block: the rare earth Ce and Fe simple substances according to the chemical formula Ce 0.8 Fe 4 Sb 12The measuring ratio is placed in an induction melting furnace, smelted four times under the protection of argon to make it uniform, and then crushed, sealed into a vacuum quartz tube together with Sb, and firstly heated from room temperature for 3 hours to 730°C and kept for 12 hour, and then continue to heat up to 900°C for 2 hours at a heating rate of 10°C / hour. Afterwards, quickly take it out and air cool to room temperature, and then anneal at 600°C for 3 days. The annealed ingot is taken out and crushed, and ball milled to obtain powder. Put the powder into the graphite mold and place it in the SPS sintering cavity, pressurize to 30Mpa under the vacuum condition of 5Pa, then raise the temperature to 600℃ for 5 minutes at a heating rate of 90℃ / min and sinter to obtain a block.

[0021] 2) (Bi 0.25 Sb 0.75 ) 2 Te ...

Embodiment 2

[0024] 1) CeFe 4 Sb 12 Preparation of powder: the rare earth Ce and Fe simple substances according to the chemical formula CeFe 4 Sb 12 The measuring ratio is placed in an induction melting furnace, smelted four times under the protection of argon to make it uniform, and then crushed, sealed into a vacuum quartz tube together with Sb, and firstly heated from room temperature for 3 hours to 730°C and kept for 12 hour, and then continue to heat up to 1000°C at a rate of 20°C / hour for 1 hour. After that, quickly take it out and cool it to room temperature, and then anneal at 600°C for 4 days. The annealed ingot is taken out and crushed, and ball milled to obtain powder. Put the powder into the graphite mold and place it in the SPS sintering cavity, pressurize to 40Mpa under the vacuum condition of 5Pa, then raise the temperature to 600℃ for 10 minutes at a heating rate of 120℃ / min and sinter to obtain a block.

[0025] 2) (Bi 0.25 Sb 0.75 ) 2 Te 3 Preparation of powder: ...

Embodiment 3

[0028] 1) Ce 1.2 Fe 4 Sb 12 Preparation of powder: the rare earth Ce and Fe simple substances according to the chemical formula Ce 1.2 Fe 4 Sb 12 The measuring ratio is placed in an induction melting furnace, smelted four times under the protection of argon to make it uniform, and then crushed, sealed into a vacuum quartz tube together with Sb, and firstly heated from room temperature for 3 hours to 730°C and kept for 12 hour, and then continue to heat up to 1000°C for 2 hours at a heating rate of 30°C / hour. Afterwards, quickly take it out and air cool to room temperature, and then anneal at 600°C for 5 days. The annealed ingot is taken out and crushed, and ball milled to obtain powder. Put the powder into a graphite mold and place it in an SPS sintering cavity, pressurize to 50Mpa under a vacuum of 5Pa, and then heat up to 600°C at a rate of 150°C / min for sintering for 10 minutes to obtain a block.

[0029] 2) (Bi 0.25 Sb 0.75 ) 2 Te 3 Preparation of powder: the co...

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Abstract

The invention discloses a P-type (Bi0.25Sb0.75)2Te3 / CeyFe4Sb12(y=0.8-1.2)-based bulk gradient thermoelectric material, which comprises a material of a low-temperature layer and a material of a medium-temperature layer, wherein the low-temperature layer comprises (Bi0.25Sb0.75)2Te3; the medium-temperature layer comprises CeyFe4Sb12(y=0.8-1.2); and a Ni or Cu transitional layer is arranged between the materials of the two layers. The invention also discloses a preparation method of the thermoelectric material, which comprises: firstly, preparing a CeyFe4Sb12 bulk according to a chemical formula; secondly, preparing (Bi0.25Sb0.75)2Te3 powder; and finally, placing the CeyFe4Sb12 bulk in a graphite mold, flatly spreading the transitional layer of the (Bi0.25Sb0.75)2Te3 powder on the CeyFe4Sb12 bulk and placing the mold in an SPS sintering furnace to sinter the materials. The thermoelectric material of the invention has a clean interface and high bonding strength and can be widely used in the field of low-high temperature waste gas and heat power generation.

Description

technical field [0001] The present invention relates to a kind of (Bi 0.25 Sb 0.75 ) 2 Te 3 / C y Fe 4 Sb 12 The (y=0.8-1.2) base block gradient thermoelectric material and its preparation method belong to the technical field of semiconductor thermoelectric materials and can be widely used in waste gas and waste heat power generation in medium and low temperature regions. Background technique [0002] Thermoelectric materials are a class of extremely important functional materials that directly couple and convert thermal energy and electrical energy using the thermoelectric effect. The thermoelectric effect is a general term for the reversible thermal effect caused by current and the electrical effect caused by temperature difference, including: Seebeck effect, Peltier effect and Thomson effect. Because thermoelectric devices have the advantages of no vibration, no noise, no leakage, small size, light weight, and no pollution to the environment, thermoelectric material...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L35/16H01L35/34C22C1/04C22F1/00H10N10/852H10N10/01
Inventor 路清梅王磊张久兴常虹张忻刘燕琴
Owner BEIJING UNIV OF TECH
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