Preparing method of high-performance multi-sized nanostructure skutterudite material

Abstract

The invention provides a preparing method of a high-performance multi-sized nanostructure skutterudite material. Firstly, a high-temperature melting quenched method is adopted to prepare a thermoelectric material ingot casting, then, a simple and easily-controlled low-temperature refrigeration-grinding method is adopted to prepare nanoscale thermoelectric powder, and refrigeration-grinding is a novel grinding method. Liquid nitrogen is adopted to serve as a refrigeration medium, and the material is ground at the ultralow temperature of -195.6 DEG C. The method has the beneficial effects that the material can be ground at the temperature lower than the temperature of the brittle point of the material, and refining of powder is facilitated; inert nitrogen atmosphere provides protection atmosphere for the material, and oxidization of the material is reduced; the low-temperature liquid nitrogen can bring out a large amount of heat generated in the grinding process, and phase changes or decomposition of the material due to temperature rise is avoided; and finally, through the discharge plasma sintering technology, the high-performance nanostructure skutterudite thermoelectric material is obtained.

Description

Technical field [0001] The invention relates to a method for preparing a high-performance multi-size nanostructure skutterudite thermoelectric material, which belongs to the field of new energy materials. Background technique [0002] Thermoelectric materials, also known as thermoelectric materials, are functional materials that utilize the Seebeck effect and Peltier effect of semiconductors to achieve direct conversion between heat and electrical energy. At the same time, devices made of thermoelectric materials have outstanding advantages such as small size, no noise, no pollution, no moving parts, and maintenance-free. They are used in electric refrigeration and thermoelectric power generation (such as beverage coolers and laser diode coolers, and spacecraft power generation Etc.) have important application prospects. [0003] CoSb 3 The base-filled skutterudite thermoelectric material has large carrier mobility, high conductivity and large Seebeck coefficient. It is a thermoel...

AI Technical Summary

Problems solved by technology

However, in the process of traditional mechanical grinding to prepare large quantities of nanopowders, a large amount of heat will be generated during the mechanical grinding process, which will cause phase change or decomposition of the material, especially for those multi-component thermoelectric materials (such as multi-component alloys, multi-doped compounds, clathrate, cage compound, etc.), which reduces the performance or activity of the material itself, resulting in a decrease in the performance of the prepared bulk material

Chemical synthesis includes hydrothermal or solvothermal synthesis, which is only suitable for a small amount of synthesis in the laboratory, and has high oxygen content and poor repeatability

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