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Novel method for quickly preparing high-performance Mg2Si0.3Sn0.7-based thermoelectric material

A thermoelectric material and high-performance technology, which is applied in the direction of thermoelectric device junction lead-out materials, thermoelectric device manufacturing/processing, etc., can solve the problems of precise control of the composition that cannot be obtained by the melting method, many times of reaction, and long reaction time. Achieve the effect of extremely short preparation time, uniform distribution of ingredients and low price

Active Publication Date: 2013-09-25
WUHAN UNIV OF TECH
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Problems solved by technology

However, the large melting point difference of the constituent elements, the melting point of Sn is 232°C, the melting point of Mg is 649°C, and the melting point of Si is 1414°C, as well as the high saturated vapor pressure and strong reactivity of Mg (which is quite serious for glass tube corrosion), making melting The precise control of the composition cannot be obtained by the method (Mg volatilization and oxidation, etc.)
Low-temperature solid-phase reaction, although the volatilization loss of Mg is better improved, but the reaction time is longer, and the number of reactions is more, the total time required for the reaction is 48h

Method used

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  • Novel method for quickly preparing high-performance Mg2Si0.3Sn0.7-based thermoelectric material
  • Novel method for quickly preparing high-performance Mg2Si0.3Sn0.7-based thermoelectric material
  • Novel method for quickly preparing high-performance Mg2Si0.3Sn0.7-based thermoelectric material

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Embodiment

[0028] A rapid preparation of high-performance Mg 2 Si 0.3 sn 0.7 A new method based on thermoelectric materials, which includes the following steps:

[0029] 1) Using Mg powder, Si powder, Sn powder and Sb powder as raw materials, according to Mg 2(1+0.08) (Si 0.3 sn 0.7 ) 0.98 Sb 0.02 (The 8% excess of Mg is to compensate for the volatilization loss of Mg). The stoichiometric ratio of the ingredients, the total weight is 5.5g, and the raw material powders are mixed evenly by hand in a mortar to obtain a uniformly mixed powder. The body is pressed into a cylindrical block with a diameter of 12.7mm on a tablet press (5MPa for 5min, then 8MPa for 10min);

[0030] 2) Put the above-mentioned cylindrical block in a graphite crucible, and then put it in a melt spinning quenching device for melt spinning. The cavity is an argon atmosphere, and the relative pressure is -0.05MPa. When performing melt spinning , the induction voltage is 150V, the rotational speed of the copper ro...

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Abstract

The invention relates to a novel method for quickly preparing a high-performance Mg2Si0.3Sn0.7-based thermoelectric material, which comprises the following steps of: 1) weighing according to the stoichiometric ratio of each atom in a thermoelectric material Mg2(1+0.08)(Si0.3Sn0.7)(1-y)Sby (0<=y<=0.025), uniformly mixing the raw material powder in a mortar, and pressing the uniformly mixed powder into a block; 2) putting the obtained block into a graphite crucible, and performing fusion spin-throwing in melt spin-throwing quenching equipment to obtain a Mg2(Si0.3Sn0.7)(1-y)Sby strip product; and 3) grinding the Mg2(Si0.3Sn0.7)(1-y)Sby strip product into powder, and performing discharge plasma activation sintering to obtain the high-performance Mg2Si0.3Sn0.7-based thermoelectric material. The method provided by the invention has the characteristics of energy saving, short preparation time, simple technological parameters and the like; and the thermoelectric merit figure ZT of the obtained block can reach 1.3.

Description

Technical field [0001] The present invention belongs to the field of new energy materials, which involves a kind of MG 2 SI 0.3 SN 0.7 Preparation method of base thermal power materials. Background technique [0002] Energy and environment plays a vital role in achieving the goal of sustainable development.Energy can make social economy a lot of development, but at the same time, it will inevitably cause the environment to deteriorate.Due to the increasing shortage of energy and environmental pollution at this stage, effective development of new energy materials has become a topic of international attention.Thermal power conversion technology can realize the direct conversion between thermal energy and electrical energy, which plays a role in reducing the consumption of fossil energy and reducing the deterioration of the social environment.The thermal power material, based on the SEEBECK effect, can use waste heat (industrial exhaust gas waste heat, automotive exhaust heat heat, ...

Claims

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Application Information

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IPC IPC(8): C22C1/05H01L35/14H01L35/34
Inventor 唐新峰张强郑云柳伟尹康
Owner WUHAN UNIV OF TECH
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