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

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, ...

AI Technical Summary

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

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