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Thermoelectric composite and preparation method thereof

A technology of composite materials and thermoelectric materials, applied in the field of thermoelectric composite materials and their preparation

Inactive Publication Date: 2011-01-12
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are currently no relevant reports on the application of liquid phase methods in the field of thermoelectric composites.

Method used

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  • Thermoelectric composite and preparation method thereof
  • Thermoelectric composite and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0082] 2.0g of synthesized barium filled skutterudite powder Ba 0.22 co 4 Sb 12 Disperse in 25mL ethanol solution, the volume concentration of the ethanol solution is 85%, the ultrasonic dispersion time is 30min, then the suspended powder is magnetically stirred, and butyl titanate (Ti(OC 4 h 9 ) 4 ) ethanol solution (the concentration of butyl titanate is 0.03mol / L) 1.9mL, hydrolyzed while stirring, suction filtered after complete hydrolysis, then dried in a vacuum oven at 120°C for 2h, and then placed in a tube furnace In Ar-7%H 2 Heat treatment at 470 °C for 2 h in the atmosphere to obtain Ba 0.22 co 4 Sb 12 / 0.4vol.%TiO 2 The composite powder is then rapidly sintered by spark plasma technology, the sintering temperature is 590°C, the holding time is 10min, and the pressure is 60MPa. Prepared Ba 0.22 co 4 Sb 12 / 0.4vol.%TiO 2 The phase analysis, structure and thermoelectric properties of the composites are shown in the attached Figure 3-9 shown.

Embodiment 2

[0084] 2.0g of synthesized barium filled skutterudite powder Ba 0.22 co 4 Sb 12 Disperse in 30mL ethanol solution, the volume concentration of the ethanol solution is 95%, the ultrasonic dispersion time is 50min, then the suspended powder is stirred, and butyl titanate (Ti(OC 4 h 9 ) 4 ) ethanol solution (the concentration of butyl titanate is 0.02mol / L) 5.7mL, hydrolyzed while stirring. Heat treatment in a tube furnace at 490 °C for 1 h in Ar atmosphere to obtain Ba 0.22 co 4 Sb 12 / 0.8vol.%TiO 2 The composite powder is then rapidly sintered by spark plasma technology, the sintering temperature is 605°C, the holding time is 8min, and the pressure is 50MPa. Prepared Ba 0.22 co 4 Sb 12 / 0.8vol.%TiO 2 The highest ZT value of the composite material is 1.02 (850K)

Embodiment 3

[0086] 2.0g of synthesized barium filled skutterudite powder Ba 0.22 co 4 Sb 12 Disperse in 35mL deionized water, ultrasonic dispersion time is 20min, then the suspended powder is stirred, and butyl titanate (Ti(OC 4 h 9 ) 4) ethanol solution (the concentration of butyl titanate is 0.04mol / L vol.%) 6.5mL, hydrolyze while stirring. , then placed in a tube furnace at N 2 Heat treatment at 450 °C for 6 h in the atmosphere to obtain Ba 0.22 co 4 Sb 12 / 1.8vol.%TiO 2 The composite powder is then rapidly sintered by spark plasma technology, the sintering temperature is 585°C, the holding time is 40min, and the pressure is 80MPa. Prepared Ba 022 co 4 Sb 12 / 1.8vol.%TiO 2 At room temperature (300K), the Seebeck coefficient reaches -119VK -1 .

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Abstract

The invention provides a preparation method of a composite, comprising: providing a suspension of a solid thermoelectric material which disperses in a liquid medium, wherein the solid thermoelectric material is filled and / or doped with skutterudite, half-Heusler alloy, a cagelike material and other thermoelectric ordered alloy or thermoelectric disordered alloy or a thermoelectric intermetallic compound; contacting the suspension with a solution formed by dissolving a metallic oxide precursor into solvent to obtain a reaction mixture; forming a metallic oxide by hydrolyzing the metallic oxide precursor in the presence of water; obtaining the compound of the metallic oxide and the solid thermoelectric material which are evenly dispersed in liquid phase; and separating the compound of the metallic oxide and the solid thermoelectric material from the liquid phase to obtain the separated composite. The invention can dramatically improve the thermoelectric performance of the composite.

Description

technical field [0001] The invention relates to a 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 T, where S is the Seebeck coefficient, is the electrical conductivity, is the thermal conductivity, and T is the absolute temperature). The higher the ZT value of the material, the higher the thermoelectric conversi...

Claims

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Application Information

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IPC IPC(8): C22C1/05C22C12/00H01L35/34
CPCH01L35/18H01L35/34H01L35/26B82Y30/00H10N10/853H10N10/857H10N10/01B01J13/00C01G1/02H10N10/00H10N10/13
Inventor 陈立东熊震陈喜红黄向阳莫尼卡.拜克浩斯何琳
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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