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A nanocomposite mg2ge/mg3sb2 thermoelectric material and its preparation method

A thermoelectric material and nano-composite technology, which is applied in the direction of thermoelectric device node lead-out materials, thermoelectric device manufacturing/processing, nanotechnology, etc., can solve the problems that the preparation process of nano-composite enhanced thermoelectric merit has never been reported, and achieve the preparation process Short period, prevent oxidation of magnesium, increase the effect of phonon scattering

Active Publication Date: 2018-10-12
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However in Mg 3 Sb 2 Among thermoelectric materials, the related preparation process of nanocomposite enhanced thermoelectric figure of merit has never been reported

Method used

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  • A nanocomposite mg2ge/mg3sb2 thermoelectric material and its preparation method
  • A nanocomposite mg2ge/mg3sb2 thermoelectric material and its preparation method
  • A nanocomposite mg2ge/mg3sb2 thermoelectric material and its preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Use high-purity (99.99%) magnesium particles (Mg), antimony particles (Sb) and germanium particles (Ge) as initial raw materials in a vacuum glove box, according to Mg 2 Ge weight percentage of Mg 2 Ge / Mg 3 Sb 2 1.5% of the composite material is mixed, the total weight is 50g, after weighing, put it into a boron nitride crucible with a lid, and then package the whole crucible into a quartz glass tube, the packaging atmosphere is Ar gas, and the quartz tube is sealed with argon gas The air pressure is 0.2 atmospheres. Put the quartz tube with the crucible into the vertical tube furnace for melting, the melting temperature is 880℃, the heating rate is 90℃ / h, after holding for 2h, it is quenched in 12% normal temperature brine, and then at 580℃ Anneal at the temperature for 24h to obtain a master alloy. Put the prepared master alloy into a quartz tube with a tip size of 0.4mm, heat it to 900-950°C and smelt it into a melt, then spin the melt to obtain a series of ribbon-sha...

Embodiment 2

[0042] Use high-purity (99.99%) magnesium particles (Mg), antimony particles (Sb) and germanium particles (Ge) as initial raw materials in a vacuum glove box, according to Mg 2 Ge weight percentage of Mg 2 Ge / Mg 3 Sb 2 1.0% of the composite material is mixed, the total weight is 50g, after weighing, put it into a boron nitride crucible with a lid, and then package the whole crucible into a quartz glass tube, the packaging atmosphere is Ar gas, and the quartz tube is sealed with argon gas The air pressure is 0.25 atmospheres. Put the quartz tube with the crucible into the vertical tube furnace for melting, the melting temperature is 890℃, the heating rate is 100℃ / h, after keeping it for 3h, it is quenched in brine, and then annealed at 580℃ for 24h to obtain the mother alloy. Put the prepared master alloy into a quartz tube with a tip size of 0.5mm, heat it to 900-950℃ to melt into a melt, and then spin the melt to obtain a series of ribbon-shaped products, the thickness of the ...

Embodiment 3

[0045] Use high-purity (99.99%) magnesium particles (Mg), antimony particles (Sb) and germanium particles (Ge) as initial raw materials in a vacuum glove box, according to Mg 2 Ge weight percentage of Mg 2 Ge / Mg 3 Sb 2 Mix 2.0% of the composite material, the total mass is 50g, after weighing, put it into a boron nitride crucible with a lid, and then package the whole crucible into a quartz glass tube, the packaging atmosphere is Ar gas, and the quartz tube is sealed with argon gas The air pressure is 0.2 atmospheres. Put the quartz tube with the crucible into the vertical tube furnace for melting, the melting temperature is 900℃, the heating rate is 110℃ / h, after keeping it for 3h, it is quenched in brine, and then annealed at 580℃ for 24h to obtain the mother alloy. Put the prepared master alloy into a quartz tube with a sharp nozzle size of 0.6mm, heat it to 900-950℃ to melt into a melt, and then spin the melt to obtain a series of ribbon-shaped products, the thickness of the...

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Abstract

The invention discloses a Mg2Ge / Mg3Sb2 thermoelectric material with a nanocomposite structure and a preparation method thereof. The thermoelectric material is composed of a Mg3Sb2 matrix phase and a Mg2Ge nanophase, wherein the Mg2Ge nanophase is dispersed in the Mg3Sb2 matrix phase, and the size of the Mg2Ge is 10- 20nm. The present invention prepares thermoelectric materials by melting, melt spinning and sintering combined with discharge plasma sintering. The obtained thermoelectric material belongs to p-type thermoelectric material, which increases phonon scattering, greatly reduces thermal conductivity, and improves Seebeck coefficient. It has good thermoelectric performance.

Description

Technical field [0001] The invention relates to a thermoelectric material, in particular to a nano-composite structure of Mg 2 Ge / Mg 3 Sb 2 Thermoelectric materials and preparation methods belong to the technical field of thermoelectric materials. Background technique [0002] Thermoelectric materials are semiconductor materials that directly realize the mutual conversion of heat and electric energy through the movement of carriers inside the material. When there is a temperature difference between the two ends of the thermoelectric material, the thermoelectric material uses its Seebeck effect to directly convert heat energy into electrical energy. On the contrary, when current is passed through the thermoelectric material, the thermoelectric material can convert electrical energy into heat energy, one end absorbs heat and the other end releases heat. Thermoelectric devices made of thermoelectric materials have the advantages of noiselessness, small size, high reliability, and no...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L35/34H01L35/18C22C1/04B82Y40/00B82Y30/00
CPCC22C1/04B82Y30/00B82Y40/00H10N10/853H10N10/01
Inventor 赵德刚吴迪宁纪爱左敏王振卿
Owner UNIV OF JINAN
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