Nanocomposite structure Mg2Si-based thermoelectric material and preparation method thereof

A thermoelectric material and nano-composite technology, which is applied in the direction of thermoelectric device junction lead-out materials, thermoelectric device manufacturing/processing, etc., can solve the problem of inability to achieve microstructure controllability, limited improvement of thermoelectric performance, and difficulty in controlling nanophase distribution conditions and other issues, to achieve the effects of inhibiting oxidation and volatilization, improving production efficiency, and improving thermoelectric performance

Inactive Publication Date: 2014-04-02
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is difficult to control the distribution of nanophases, it is difficult to avoid the introduction of interface contamination, and it is impossible to realize the controllability of the microstructure, so that the improvement of the thermoelectric performance of the material is limited.

Method used

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  • Nanocomposite structure Mg2Si-based thermoelectric material and preparation method thereof
  • Nanocomposite structure Mg2Si-based thermoelectric material and preparation method thereof
  • Nanocomposite structure Mg2Si-based thermoelectric material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0021] 1) Using high-frequency induction suspension melting equipment, using Mg block (purity 99.99%), Si block (purity 99.999%), Sn block (purity 99.99%) as raw materials, according to the chemical formula Mg 2 Si 0.4 sn 0.6 Proportionally weighed in an Ar atmosphere, the prepared raw materials were put into a red copper crucible for smelting, and the deoxidized argon was used as the protective atmosphere of the smelting process. The smelting time was 80s and the maximum power was 14kw.

[0022] 2) Using induction melting and rapid quenching furnace equipment, the smelted components are Mg 2 Si 0.4 sn 0.6 The ingot is loaded into a quartz tube with an open lower end, and then placed vertically in the induction melting coil of the cavity of the quick quenching equipment. The injection pressure is 0.02MPa, so that the induction smelting block reaches a molten state, and the melt is sprayed onto a copper roller with a speed of 40m / s and thrown out to form a strip and collect...

Embodiment 2

[0025] 1) Using high-frequency induction suspension melting equipment, using Mg block (purity 99.9%), Si block (purity 99.999%), Sn block (purity 99.9%) as raw materials, according to the chemical formula Mg 2 Si 0.5 sn 0.5 Proportionally weighed in an Ar atmosphere, the prepared raw materials were put into a copper crucible for smelting, and the deoxidized argon was used as the protective atmosphere of the smelting process. The smelting time was 90s and the maximum power was 16kw.

[0026] 2) Using induction melting and rapid quenching furnace equipment, the smelted components are Mg 2 Si 0.5 sn 0.5 The ingot is loaded into a quartz tube with an open lower end, and then placed vertically in the induction melting coil of the cavity of the quick quenching equipment. The injection pressure is 0.03MPa, so that the induction smelting block reaches a molten state, and the melt is sprayed on a copper roller with a speed of 30m / s and thrown out to form a strip and collect the str...

Embodiment 3

[0029] 1) Using high-frequency induction suspension melting equipment, using Mg block (purity 99.9%), Si block (purity 99.999%), Sn block (purity 99.9%) as raw materials, according to the chemical formula Mg 2 Si 0.6 sn 0.4 Proportionally weighed in an Ar atmosphere, the prepared raw materials were put into a red copper crucible for smelting, and the deoxidized argon was used as the protective atmosphere of the smelting process. The smelting time was 100s and the maximum power was 17kw.

[0030] 2) Using induction melting and rapid quenching furnace equipment, the smelted components are Mg 2 Si 0.6 sn 0.4 The ingot is loaded into a quartz tube with an open lower end, and then placed vertically in the induction melting coil of the cavity of the quick quenching equipment. The injection pressure is 0.05MPa, so that the induction smelting block reaches a molten state, and the melt is sprayed onto a copper roller with a speed of 20m / s and thrown out to form a strip and collect ...

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Abstract

The invention relates to a nanocomposite structure Mg2Si-based thermoelectric material and a preparation method thereof, and belongs to the technical field of preparation of semiconductor thermoelectric materials. The preparation method comprises the following steps: taking Mg, Si and Sn elementary substance materials according to a stoichiometric ratio and performing high-frequency induction smelting to form cast ingot; crushing the smelted cast ingots, filling into a quartz glass tube with a lower open end, vertically placing into an induction smelting coil, vacuumizing a cavity of a rapid quenching furnace, filling protective gas, performing induction smelting to enable the block to reach a molten state, spraying the melt to a copper rod, throwing out to form belt materials, and collecting the belt materials; placing the belt materials into a glove box under the argon protective atmosphere, grinding into powder, and performing spark plasma sintering into blocks. The preparation method is simple and feasible; the process flow is short; oxidation of Mg can be effectively inhibited; process parameters are easy to control. An amorphous / nanocrystalline composite structure exists in a sample, the grain size is obviously refined, the grain size distribution is controllable, scattering of electrons and phonons is increased, the Seebeck coefficient is greatly increased, and the thermoelectric property of the material is improved.

Description

technical field [0001] The invention belongs to the technical field of semiconductor thermoelectric material preparation, and specifically relates to a nanocomposite structure Mg 2 Si-based thermoelectric material and preparation method thereof. Background technique [0002] A thermoelectric material is a functional material that converts electrical energy and thermal energy through the movement of carriers (electrons or holes) inside a solid. When there is a temperature difference between the two junctions of the thermoelectric material, the thermoelectric material can convert electrical energy into thermal energy; or conversely, when a current is passed through the thermoelectric material, the thermoelectric material can convert electrical energy into thermal energy, one end releases heat and the other end absorbs heat. Thermoelectric materials have broad application prospects in cooling or heating. Power generation devices and refrigeration devices made of thermoelectri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L35/14H01L35/34
Inventor 张忻刘洪亮武鹏旭路清梅张久兴
Owner BEIJING UNIV OF TECH
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