Method for super-rapidly preparing high-performance high-silicon-manganese thermoelectric material

Abstract

The invention particularly relates to a method for super-rapidly preparing a high-performance high-silicon-manganese thermoelectric material. The method comprises the following steps: 1) weighing Mn powder, M powder and Si powder according to the stoichiometric ratio of each atom of Mn(MxSi<1-x>)1.75, then grinding raw materials, mixing uniformly and pressing into blocks, wherein M is Al or Ge, x is equal to or greater than 0 and less than or equal to 0.0045 when M is Al, and x is equal to or greater than 0 and less than or equal to 0.01 when M is Ge; 2) initiating the blocks obtained in step 1) to carry out thermal explosion synthesis reaction, and naturally cooling after the reaction is completed to obtain a single-phase high-manganese-silicon compound; 3) grinding the single-phase high-manganese-silicon compound into powder and carrying out spark plasma activation sintering to obtain the high-performance high-silicon-manganese thermoelectric material. The method disclosed by the invention has the advantages of high reaction speed, simple process, efficiency and energy conservation, good repeatability and the like, the whole preparation process can be shortened from above 12 hours required in the traditional method to within 0.5 hour, and the obtained blocks have excellent thermoelectric properties.

Description

technical field [0001] The invention belongs to the technical field of preparation of new energy materials, and in particular relates to a method for ultrafast preparation of high-performance high-manganese silicon thermoelectric materials. Background technique [0002] In the international environment where non-renewable fossil energy such as oil, coal, and natural gas is consumed in large quantities and causes energy shortages, the development of green and renewable energy has become the only way for the sustainable and stable development of human society. Thermoelectric conversion technology is a technology that realizes direct mutual conversion between electric energy and thermal energy through the Seebeck effect and Peltier effect of thermoelectric materials. It has the advantages of no transmission parts, small size, no noise, and good reliability. It is used as a Environmentally friendly energy conversion technology has important application prospects in the recovery ...

AI Technical Summary

Problems solved by technology

However, during the melting process, due to the slow diffusion rate of Si atoms, it is difficult to complete the peritectic reaction between the previously formed MnSi phase and the Si melt, and it is difficult to obtain a single-phase high manganese silicon compound

The mechanical alloying method is another widely used method, but due to the long preparation cycle, high requirements on equipment, and easy introduction of impurities, it is difficult to apply on a large scale

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