A mg-si-sn based nanocomposite thermoelectric material and its preparation method

A mg-si-sn, nano-composite technology, applied in the field of Mg-Si-Sn-based nano-composite thermoelectric materials and its preparation, to achieve the effect of improving electrical conductivity and power factor, reducing lattice thermal conductivity, and reducing interface pollution

Inactive Publication Date: 2016-07-06
SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But so far, no literature and patents have reported Mg-Si-Sn-based thermoelectric materials with coherent / semi-coherent nanostructures.

Method used

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  • A mg-si-sn based nanocomposite thermoelectric material and its preparation method
  • A mg-si-sn based nanocomposite thermoelectric material and its preparation method
  • A mg-si-sn based nanocomposite thermoelectric material and its preparation method

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preparation example Construction

[0047] The present invention adopts the technological process of preparing Mg-Si-Sn-based nano-composite thermoelectric materials by the medium-speed cooling method of radio frequency induction furnace and heat treatment method, such as figure 1 As shown, the preparation method at least includes the following steps:

[0048] Step S1, according to the general chemical formula Mg 2 Si x sn 1-x m y The stoichiometric ratio of the elements in the medium is to weigh the elemental raw materials Mg, Si, Sn and M, and the Mg is in excess of 3% to 10% by atomic percentage to compensate for the evaporation loss of Mg in the subsequent high temperature process; where M is expressed as Sb, Bi, One of Ga, Ag, Cu or Al, 0.3≤x≤0.9, 0.005≤y≤0.15;

[0049] Step S2, sealing the weighed raw materials in a double-layer container composed of inert ceramics / conductive sensors, and then placing the container in a radio frequency induction furnace to heat it to the first temperature, keeping it a...

Embodiment 1

[0056] In a glove box filled with nitrogen, according to the stoichiometric ratio of Mg 2.10 Si 0.3 sn 0.7 Sb 0.03 Weigh the elemental raw materials Mg, Si, Sn, and Sb, seal these raw materials in a double-layer container composed of inert ceramics / conductive sensors, then place them in a radio frequency induction furnace, and heat them to 1000°C under the protection of high-purity nitrogen. Insulate for 30 minutes to fully melt, then cool down to 600°C at a rate of 20°C / min, quickly cool to room temperature after holding for 30 minutes, and then transfer to a heating furnace with uniform temperature distribution and anneal at 600°C for 20 minutes under the protection of high-purity nitrogen. Hours, after cooling at a rate of 5K / min, a Mg-Si-Sn-based thermoelectric material with a layered modulation doped structure and a coherent nanostructure is obtained.

[0057] After the desired thermoelectric material is obtained, the morphology analysis and performance test of the mat...

Embodiment 2

[0064] In a glove box filled with nitrogen, according to the stoichiometric ratio of Mg 2.10 Si 0.3 sn 0.7 Bi 0.015 Weigh the elemental Mg, Si, Sn, Bi raw materials, seal these raw materials in a double-layer container composed of inert ceramics / conductive sensors, then place them in a radio frequency induction furnace, and heat them to 1000°C under the protection of high-purity argon. Keep warm for 35 minutes to fully melt, then cool down to 600°C at a rate of 20°C / min, quickly cool to room temperature after holding for 30 minutes, and then transfer to a heating furnace with uniform temperature distribution and anneal at 600°C under the protection of high-purity argon After cooling for 40 hours at a rate of 5K / min, a Mg-Si-Sn-based thermoelectric material with a layered modulation doped structure and a coherent nanostructure was obtained.

[0065] After the desired thermoelectric material is obtained, the morphology analysis and performance test of the material are carried...

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Abstract

The invention provides a Mg-Si-Sn based nanocomposite thermoelectric material and a preparation method thereof. The Mg-Si-Sn based nanocomposite thermoelectric material has a layered structure and its general chemical formula is Mg 2 Si x sn 1-x m y , where M represents a doping element, one selected from Sb, Bi, Ga, Ag, Cu or Al, 0.3≤x≤0.9, 0.005≤y≤0.15; each layer structure has a different Mg: Si: Sn atom molar content ratio, and different M doping concentrations; each layer structure consists of Mg-Si-Sn matrix and Mg-Si-Sn nanocrystals that form a coherent or semi-coherent interface with the matrix in a diffuse distribution Particle second phase composition. The Mg-Si-Sn-based nanocomposite thermoelectric material has a coherent interface and a modulated doping structure, has low lattice thermal conductivity and good thermoelectric performance, and can be widely used in the fields of aerospace, national defense, and automobiles.

Description

technical field [0001] The invention belongs to the field of semiconductor thermoelectric materials, and relates to a Mg-Si-Sn-based nanocomposite thermoelectric material and a preparation method thereof, in particular to a Mg-Si-Sn-based nanocomposite thermoelectric material with a coherent interface and a modulated doping structure Materials and their preparation methods. Background technique [0002] Energy shortage and environmental pollution have become severe global problems, but two-thirds of the energy is lost in the form of waste heat in the process of energy use. Thermoelectric material is a new type of functional material that can use waste energy such as automobile exhaust heat, industrial waste heat, and hot spring heat to generate electricity, and can replace Freon as an environmentally friendly and clean refrigerant. Because thermoelectric materials use electrons and hole carriers in solid materials to directly convert heat and electricity, they have the adva...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/00C22C1/02C22F1/06
Inventor 陈海燕陈小源王春林林珊珊赵玲杨康王会利
Owner SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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