Method for quickly preparing high-performance Mg2Si-based thermoelectric material

A thermoelectric material and high-performance technology, which is applied in the field of rapid preparation of high-performance Mg2Si-based thermoelectric materials, can solve the problems of long reaction time and inability to obtain precise control of the melting method, and achieve fast reaction speed, high efficiency, energy saving, heating and cooling rate, and repeatability Good results

Active Publication Date: 2013-12-11
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the large melting point difference of the constituent elements, the melting point of Mg is 649 ° C, the melting point of Si is 1414 ° C, and the high saturated vapor pressure and strong reactivity of Mg (corrosion to the glass tube is quite serious), so that the melting method cannot obtain the composition. Precise control (Mg volatilization and oxidation, etc.)
Low-temperature solid-state reaction, although the volatilization loss of Mg is better improved, but the reaction time is longer

Method used

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  • Method for quickly preparing high-performance Mg2Si-based thermoelectric material
  • Method for quickly preparing high-performance Mg2Si-based thermoelectric material
  • Method for quickly preparing high-performance Mg2Si-based thermoelectric material

Examples

Experimental program
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Effect test

Embodiment 1

[0032] A rapid preparation of high-performance Mg 2 The method for Si-based thermoelectric material, it comprises the following steps:

[0033] 1) Press Mg 2(1+0.02) The stoichiometric ratio of each atom of Si is weighed (Note: Mg 2(1+0.02) The stoichiometric ratio of each atom in Si relative to Mg 2 For Si, the excess of Mg is 2%, in order to compensate for the volatilization loss of Mg in the reaction), the total mass is 2.1g, and then they are ground and mixed uniformly, and the uniformly mixed powder is pressed into a cylindrical block with a diameter of 10mm (5MPa hold pressure for 5min, then 8MPa hold pressure for 10min);

[0034] 2) End-ignite the block obtained in step 1) in an air atmosphere to initiate a self-propagating reaction (SHS) and cool naturally after the reaction is completed;

[0035] 3) Grind the above-mentioned product into powder, put the powder into a 15mm graphite mold for compaction, and then conduct discharge plasma activation sintering (PAS) un...

Embodiment 2

[0038] A rapid preparation of high-performance Mg 2 The method for Si-based thermoelectric material, it comprises the following steps:

[0039] 1) Press Mg 2(1+0.02) Si 0.096 Sb 0.006 The stoichiometric ratio of each atom is weighed, the total mass is 2.1g, then they are ground and mixed uniformly, and the uniformly mixed powder is pressed into a cylindrical block block with a diameter of 10mm (5MPa holding pressure for 5min, then 8MPa holding pressure 10min);

[0040] 2) End-ignite the block obtained in step 1) in an air atmosphere to initiate a self-propagating reaction (SHS) and cool naturally after the reaction is completed;

[0041] 3) Grind the above-mentioned product into powder, put the powder into a 15mm graphite mold for compaction, and then conduct discharge plasma activation sintering (PAS) under the conditions of a vacuum of less than 10Pa and a sintering pressure of 33MPa, at a temperature of 100°C / min The heating rate was raised to 800°C, and the sintering ...

Embodiment 3

[0044] A rapid preparation of high-performance Mg 2 The method for Si-based thermoelectric material, it comprises the following steps:

[0045] 1) Press Mg 2(1+0.02) Si 0.09 Sb 0.01 The stoichiometric ratio of each atom is weighed, the total mass is 2.1g, then they are ground and mixed uniformly, and the uniformly mixed powder is pressed into a cylindrical block block with a diameter of 10mm (5MPa holding pressure for 5min, then 8MPa holding pressure 10min);

[0046] 2) End-ignite the block obtained in step 1) in an air atmosphere to initiate a self-propagating reaction (SHS) and cool naturally after the reaction is completed;

[0047] 3) Grind the above-mentioned product into powder, put the powder into a 15mm graphite mold for compaction, and then conduct discharge plasma activation sintering (PAS) under the conditions of a vacuum of less than 10Pa and a sintering pressure of 33MPa, at a temperature of 100°C / min The heating rate was raised to 800°C, and the sintering an...

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Abstract

The invention relates to a method for quickly preparing a high-performance Mg2Si-based thermoelectric material. The method comprises the following steps: (1) weighing according to the stoichiometric proportion of all atoms in Mg2 (1+0.02) Si (1-x) Sbx (0<=x<=0.025), then grinding and uniformly mixing the atoms, and pressing the uniformly mixed powder into a block; (2) subjecting the block obtained in the step (1) to the self-propagating reaction, and then naturally cooling to obtain a single-phase Mg2 (1+0.02) Si (1-x) Sbx compound; (3) grinding the obtained product into powder, and performing discharge plasma activated sintering to obtain the high-performance Mg2Si-based thermoelectric material. The method provided by the invention has the advantages of quickness in reaction, simple process, high efficiency, energy saving, good repeatability and the like, the whole preparation process can be completed within 0.5 h, and the thermoelectric figure of merit ZT of the obtained block can reach 0.73 at 875K.

Description

technical field [0001] The invention belongs to the technical field of preparation of new energy materials, in particular to a method for rapidly preparing high-performance Mg 2 Approaches to Si-based thermoelectric materials. Background technique [0002] The increasing destruction of the natural environment and the depletion of fossil energy have become important issues of great concern to the world. The proposal of the sustainable development strategy is undoubtedly a forward-looking achievement that complies with the current real development needs. In order to reduce the burden of environmental damage and energy consumption, many scientists around the world are focusing their attention on finding and developing renewable new energy sources. [0003] Thermoelectric conversion technology can realize direct mutual conversion between electric energy and thermal energy through the Seebeck effect and Peltier effect of thermoelectric materials. As an environmentally friendly ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05C22C23/00H01L35/18
Inventor 唐新峰张强
Owner WUHAN UNIV OF TECH
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