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Composite nanometer ZnSb-based thermoelectric material and preparation thereof

A kind of thermoelectric material and nanotechnology, which is applied in the direction of thermoelectric device node lead wire materials, etc., can solve the problems affecting thermoelectric performance and application limitations, and achieve the effect of improving thermoelectric performance

Inactive Publication Date: 2008-10-01
SNTO TECH GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when this kind of high-energy ball milling is used to prepare thermoelectric materials, impurities are often introduced to affect the thermoelectric properties, which limits the application of this method in the field of thermoelectric material synthesis.

Method used

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  • Composite nanometer ZnSb-based thermoelectric material and preparation thereof
  • Composite nanometer ZnSb-based thermoelectric material and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) According to the nominal composition, it is Zn 4 Sb 3 Stoichiometric ratio Weigh high-purity Zn powder 4.152g and Sb powder 5.800g, nano powder accounts for 0.5% by weight, weigh high-purity Zn nano powder 0.02g and Sb nano powder 0.03g, and after uniform mixing, ball mill jar The ratio of ball to material is 10:1, put it into a nylon ball mill tank, and after vacuuming, feed N 2 to slightly higher than 100kPa, install it in a planetary ball mill, adjust the rotating speed to 250 rpm, and grind for 12 hours at room temperature to obtain a composite nanopowder.

[0024] (2) Press the above powder at 30MPa for 15 minutes to make a green body with a diameter of 10mm and a thickness of 5mm. The green body is placed in an ultra-high pressure device and loaded at a pressure increase rate of 1.2GPa / min at room temperature To 3GPa, after maintaining the pressure for 10min, unload to normal pressure at the same depressurization rate to obtain a dense bulk thermoelectric ma...

Embodiment 2

[0028] (1) According to the nominal composition, it is Zn 4 Sb 3 Stoichiometric ratio Weigh high-purity Zn powder 4.131g and Sb powder 5.769g, nano powder accounts for 1% by weight, weigh high-purity Zn nano powder 0.04g and Sb nano powder 0.058g, and after uniform mixing, ball milling tank The ratio of ball to material is 10:1, put it into a nylon ball mill tank, and after vacuuming, feed N 2 to slightly higher than 100kPa, install it in a planetary ball mill, adjust the rotating speed to 250 rpm, and grind for 12 hours at room temperature to obtain a composite nanopowder. That is, the material of the present invention is obtained.

[0029] (2) Press the above powder at 30MPa for 15 minutes to make a green body with a diameter of 10mm and a thickness of 5mm. The green body is placed in an ultra-high pressure device and loaded at a pressure increase rate of 1.2GPa / min at room temperature To 3GPa, after maintaining the pressure for 10min, unload to normal pressure at the sam...

Embodiment 3

[0032] (1) According to the nominal composition, it is Zn 4 Sb 3 The stoichiometric ratio weighs 3.964g of high-purity Zn powder and 5.536g of Sb powder, and after uniform mixing, the ball-material ratio of the ball mill tank is 10:1, put them into the nylon ball mill tank, and after vacuuming, feed N 2 to slightly higher than 100kPa, install it in a planetary ball mill, adjust the speed at 250 rpm, and grind for 8 hours at room temperature;

[0033] (2) add and account for 5% nano-powder by weight in the ball mill tank, promptly take high-purity Zn nano-powder 0.209g and Sb nano-powder 0.291g, then vacuumize, pass into N 2 to slightly higher than 100kPa, and continue ball milling for 4 hours to obtain a composite nanopowder.

[0034] (3) Press the above powder at 30MPa for 15 minutes to make a green body with a diameter of 10mm and a thickness of 5mm. The green body is placed in an ultra-high pressure device and loaded at a pressure increase rate of 1.2GPa / min at room tempe...

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Abstract

A composite nanometer Znsb group thermoelectric material and a manufacturing method thereof are disclosed, the composite nanometer Znsb base thermoelectric material is manufactured by the following method, high pure Zn powder, Sb powder and nanometer Zn powder which is 0.5-30% of mass number of Zn and Sb powder, nanometer Sb powder or Zn, Sb nanometer lines; high energy ball milling is carried out under an inert atmosphere to obtain the powder of Znsb group compound, eventually, the powder is cool-pressed to formation and densified under the pressure of 1-8GPa and at 10-30 DEG C, wherein mol ratio of Zn element to Sb element is 4-2: 3. The material of the invention includes lower heat conduction coefficient, and higher thermoelectric conversion rate.

Description

technical field [0001] The invention relates to a new energy thermoelectric conversion material, in particular to a composite nanometer ZnSb-based thermoelectric material and a preparation method thereof. Background technique [0002] The thermoelectric conversion efficiency of thermoelectric materials depends on the dimensionless thermoelectric figure of merit ZT = α 2 σT / κ, T is the absolute temperature, α is the Seebeck coefficient, σ is the electrical conductivity, and κ is the thermal conductivity. Reducing κ, increasing α and σ are three ways to increase the ZT value, but for metal conductors κ, σ and α are generally strongly correlated, the decrease of κ must be accompanied by the decrease of σ, and σ generally decreases when α increases, When σ increases, κ must increase. How to coordinately regulate κ, σ, and α to achieve a substantial increase in ZT value has always been the goal pursued by thermoelectric materials scientists and physicists. [0003] In recent y...

Claims

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Application Information

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IPC IPC(8): C22C12/00C22C1/04B22F3/02H01L35/18
Inventor 肖忠良汪奕醒刘丹
Owner SNTO TECH GRP
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