Composite thermoelectric material and preparing method thereof

A technology of thermoelectric materials and thermoelectricity, which is applied in the direction of thermoelectric device node lead-out materials, thermoelectric device manufacturing/processing, etc., can solve the problems of small phase interface, size, and size difficult to control, and achieve thermal conductivity reduction and thermoelectricity optimization. The effect of increasing the value ZT and suppressing the thermal conductivity

Active Publication Date: 2015-06-24
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims at the technical problem that the phase interface formed by introducing the second nano phase in the liquid phase composite method of the prior art is small, and the size and size are difficult to control, so that the potential for improving the thermoelectric figure of merit is limited, and the purpose is to provide a new Composite Thermoelectric Materials

Method used

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  • Composite thermoelectric material and preparing method thereof
  • Composite thermoelectric material and preparing method thereof
  • Composite thermoelectric material and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1Yb 0.27 co 4 Sb 12 Preparation of / 0.2wt%GO

[0032] Yb 0.27 co 4 Sb 12 Preparation of matrix powder: Use pure elements Yb, Co, and Sb as initial raw materials, weigh them in a stoichiometric ratio, and transfer them into a quartz tube. Vacuum packaging is carried out in an argon atmosphere glove box using a plasma flame packaging method at a vacuum degree of 1-10 Pa. Then place it in a vertical melting furnace, raise the temperature to 1080°C at a rate of 5°C / min, keep it melted for 12 hours, and quench in ice water. Then place it in a tubular annealing furnace for annealing, raise the temperature to 790°C at a rate of 5°C / min, and anneal at a constant temperature for 168h. Annealed ingots were ground in a mortar to Yb 0.27 co 4 Sb 12 Base powder.

[0033] Preparation of graphene oxide GO: Weigh 1g of graphite powder into a round-bottomed flask, put it in an ice-water bath on a magnetic stirrer, add 50mL of 98% concentrated sulfuric acid and 3.5g of...

Embodiment 2

[0037] Example 2Yb 0.27 co 4 Sb 12 Preparation of / 0.5wt%GO

[0038] Yb 0.27 co 4 Sb 12 The preparation of matrix powder and GO is the same as in Example 1.

[0039] Preparation of Yb by liquid phase composite method 0.27 co 4 Sb 12 / 0.5wt%GO composite thermoelectric material: 1.5g Yb obtained by rough grinding 0.27 co 4 Sb 12 The matrix powder was mixed with 150mL, 0.05mg / mL GO solution, and ultrasonically treated at 50HZ for 1h, filtered for 2h and dried in a 60 vacuum oven for 12h. The dried powder is finely ground to obtain composite thermoelectric material powder. Finally, the composite thermoelectric material powder was plasma sintered at 600° C. and 60 MPa for 15 minutes to obtain a composite thermoelectric material block.

[0040] Depend on Figure 5 It can be seen that the thermoelectric performance measurement shows that in the measured temperature range (300-850K), compared with Yb 0.27 co 4 Sb 12 As far as the matrix is ​​concerned, the electrical ...

Embodiment 3

[0041] Example 3Ce 0.85 Fe 3 CoSb 12 Preparation of / 0.2wt%GO

[0042] Ce 0.85 Fe 3 CoSb 12 Preparation of matrix powder: Use pure elements Ce, Fe, Co, and Sb as initial raw materials, weigh them according to the stoichiometric ratio, and then transfer them into a quartz tube. Vacuum packaging is carried out in an argon atmosphere glove box using a plasma flame packaging method at a vacuum degree of 1-10 Pa. Then place it in a vertical melting furnace, raise the temperature to 1100°C at a rate of 5°C / min, keep it melted for 12 hours, and quench in ice water. Then place it in a tubular annealing furnace for annealing, raise the temperature to 700°C at a rate of 5°C / min, and anneal at a constant temperature for 168h. Annealed ingots were ground in a mortar to Ce 0.85 Fe 3 CoSb 12 Base powder.

[0043] The preparation of GO is the same as in Example 1.

[0044] Preparation of Ce by liquid phase composite method 0.85 Fe 3 CoSb 12 / 0.2wt%GO composite thermoelectric m...

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Abstract

The invention discloses a composite thermoelectric material and the preparing method thereof. The composite thermoelectric material comprises a solid thermoelectric material and oxidized graphene. The preparing method comprises the steps of mixing solid thermoelectric material powder and oxidized graphene solution, conducting ultrasonic treatment, and obtaining the composite thermoelectric material through suction filtration, drying, grinding and sintering. Compared with an N-type solid matrix thermoelectric material, the composite thermoelectric material has the advantages that heat conductivity is reduced greatly, electrical transport property is basically unchanged, and then thermoelectricity merit figure ZT is increased by over 25%; compared with a P-type solid matrix thermoelectric material, the composite thermoelectric material has the advantages that conductivity and Seebeck coefficient are both improved, heat conductivity is effectively restrained, and thermoelectricity merit figure ZT is increased by over 50%; meanwhile, compared with the N-type solid matrix thermoelectric material and the P-type solid matrix thermoelectric material, the composite thermoelectric material containing oxidized graphene has the advantage that ZT can be increased greatly within the whole temperature range.

Description

technical field [0001] The invention belongs to the field of thermoelectric materials, and in particular relates to a composite solid thermoelectric material and a preparation method thereof. Background technique [0002] A thermoelectric material is a material that uses the transport of carriers in a solid to achieve mutual conversion between thermal energy and electrical energy. It has the advantages of small size, no noise, zero pollution discharge, etc., so it has broad application prospects. American scientist Slack proposed that the material has the high electronic conductivity of crystals and the low thermal conductivity of glass, which can optimize its thermoelectric performance. The thermoelectric performance is usually evaluated by the dimensionless thermoelectric figure of merit ZT, where ZT=S 2 Tσ / κ, S is the thermoelectric potential or Seebeck coefficient, T is the absolute temperature, σ is the electrical conductivity, and κ is the thermal conductivity. Typi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L35/14H01L35/34C22C1/05
Inventor 陈立东宗鹏安陈喜红吴汀李小亚
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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