Nanometer thermoelectric powder material preparing method

A technology of powder materials and thermoelectric materials, which is applied in the field of preparation of nanometer thermoelectric powder materials, can solve the problems of reduced performance of bulk materials, decreased performance or activity, and high oxygen content, and achieves high utilization rate, good morphology and performance. , good controllability

Inactive Publication Date: 2012-03-21
DONGHUA UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of traditional mechanical grinding to prepare large quantities of nanopowders, a large amount of heat will be generated during the mechanical grinding process, which will cause phase change or decomposition of the material, especially for those multi-component thermoelectric materials (such as multi-component alloys, multi-doped compounds, clathrate, cage compound, etc.), which reduces the performance or activity of the material itself, resulting in a decrease in the performance of the prepared bulk material
Chemical synthesis includes hydrothermal or solvothermal synthesis, which is only suitable for a small amount of synthesis in the laboratory and has a high oxygen content

Method used

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  • Nanometer thermoelectric powder material preparing method
  • Nanometer thermoelectric powder material preparing method
  • Nanometer thermoelectric powder material preparing method

Examples

Experimental program
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Effect test

Embodiment 1

[0026] By Bi 2 Te 3 The crystal material is used as the raw material. First, the crystal material is broken into coarse particles smaller than 5mm in the steel mold. Weigh 9-10g of the sample and put it into a grinding jar together with grinding balls, and then immerse it in a grinder filled with liquid nitrogen. Set the pre-cooling time to 10 minutes, and the grinding time to 10 hours. After the grinding is completed, the nano-scale powder is obtained after vacuum drying. The crystal form of the obtained powder is complete without phase change or decomposition; the grain size is 10-15nm. (see attached figure 1 , 2 )

Embodiment 2

[0028] Use Yb, Co and Sb element powder as raw materials, put them into graphite crucibles according to the mass ratio of 0.35:1:3, and then pack them into sealed quartz tubes (vacuumize inside the tubes), put them into a programmable temperature-controlled furnace, and raise the temperature. After heat preservation and quenching, Yb 0.35 CoSb 3 raw material.

[0029] Take Yb 0.35 CoSb 3 The crystal material is used as the raw material. Firstly, the crystal material is crushed into coarse particles smaller than 5mm in the steel mold. Weigh 9-10g of the sample and put it into the central cylinder together with the steel striker, and then fix it on the cryogenic grinder filled with liquid nitrogen. Set the pre-cooling time to 20 minutes, the frequency to 10 cps, the grinding time to 2 minutes, the re-cooling time to 3 minutes, and the cycle to 10. After 18 hours of freeze-grinding, samples were taken after the air was raised to room temperature, and then vacuum-dried to obtai...

Embodiment 3

[0031] Use Zr, Hf, Ni and Sn element powders as raw materials, put them into a graphite crucible at a mass ratio of 0.5:0.5:1:1, then pack them into a sealed quartz tube (the tube is vacuumed), and put it into a temperature-controlled furnace During heating, heat preservation, and quenching, Zr 0.5 Hf 0.5 NiSn.

[0032] Take Zr 0.5 Hf 0.5 NiSn crystals are used as raw materials. First, the crystal material is broken into coarse particles smaller than 5 mm in a steel mold. Weigh 9-10 g of the sample and put it into a central cylinder together with a steel striker, and then fix it on a cryogenic grinder filled with liquid nitrogen. Set the pre-cooling time to 10 minutes, the frequency to 10 cps, the grinding time to 2 minutes, the re-cooling time to 3 minutes, and the cycle to 10. After 25 hours of freeze-grinding, samples were taken after the air was raised to room temperature, and then vacuum-dried to obtain nano-scale powder. The crystal form of the obtained powder is com...

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Abstract

The invention relates to a nanometer thermoelectric powder material preparing method which comprises the following steps: crushing a thermoelectric material into 1mm-5mm of coarse powder; placing the coarse powder into a grinding tank, dipping liquid nitrogen and then precooling for 5-60min; and grinding the mixture in the liquid nitrogen environment for 1-30h, thus obtaining nanometer thermoelectric powder by vacuum drying after grinding. With the method, the nanometer thermoelectric powder which does not have phase change or decomposition is prepared, and the powder is ensured to have a good shape and performance, and has good controllability, high utilization rate, no pollution and the like, so that good developing and promoting prospect can be realized.

Description

technical field [0001] The invention belongs to the field of preparation of thermoelectric materials, in particular to a method for preparing nanometer thermoelectric powder materials. Background technique [0002] Thermoelectric materials, also known as thermoelectric materials, are functional materials that use the Seebeck effect and Peltier effect of semiconductors to achieve direct mutual conversion between thermal energy and electrical energy. At the same time, devices made of thermoelectric materials have outstanding advantages such as small size, no noise, no pollution, no moving parts, and maintenance-free. They have important application prospects in thermoelectric cooling and thermoelectric power generation, such as beverage refrigerators and laser diodes. Coolers, power generation for space missions, etc. [0003] However, due to their relatively low conversion efficiency, thermoelectric materials that have been commercialized at present have no obvious advantage...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L35/34B22F9/04B82Y40/00B02C23/00
Inventor 王连军陈晓宗董媛江莞林岩
Owner DONGHUA UNIV
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