Composite PbSe-based thermoelectric material doped with Sr and Na and preparation method thereof

A technology of thermoelectric materials and composite materials, which is applied in the direction of thermoelectric device lead-out wire materials, etc., can solve the problems of low conversion efficiency, limit the application of thermoelectric devices, and low conversion efficiency of thermoelectric materials, so as to reduce thermal conductivity and shorten sintering time , The effect of improving thermoelectric performance

Inactive Publication Date: 2015-12-09
SHANGHAI UNIV
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Problems solved by technology

[0007] Although thermoelectric devices made of thermoelectric materials have broad application prospects, the conversion efficiency of thermoelectric materials is very low, only about 10%, which is far lower than the 35% conversion efficiency of ordinary heat engines, wh

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  • Composite PbSe-based thermoelectric material doped with Sr and Na and preparation method thereof
  • Composite PbSe-based thermoelectric material doped with Sr and Na and preparation method thereof
  • Composite PbSe-based thermoelectric material doped with Sr and Na and preparation method thereof

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Embodiment Construction

[0027] Preferred embodiments of the present invention are described in detail as follows:

[0028] In this example, see Figure 1 to Figure 10 , a preparation method of a PbSe-based thermoelectric material doped with Sr and Na, comprising the steps of:

[0029] a. In the glove box according to the composite material composition Pb 0.88 Sr 0.10 Na 0.02 The molar component ratio of the stoichiometric ratio of Se weighed 5.3873g, 0.2595g, 0.15g and 2.3383g of the elemental materials of Sr, Na, Pb and Se respectively, and then weighed the elemental materials of Sr, Na, Pb and Se After the materials are evenly mixed, put them into a graphite crucible, seal the graphite crucible into a quartz tube with a propane flame, then put the vacuum-sealed graphite crucible into a well furnace, and then mix the Sr, Na, Pb and Se in the graphite crucible Material heat treatment smelting and calcination, first heat up at 5°C / min to the melting temperature of 1050°C for 24 hours, then cool do...

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Abstract

The invention discloses a composite PbSe-based thermoelectric material doped with Sr and Na and a preparation method thereof. The preparation method comprises the steps of firstly weighing Pb, Sr, Na and Se according to a stoichiometric ratio of Pb<0.98-x>Sr<x>Na<0.02>Se, mixing Pb, Sr, Na and Se, carrying out vacuum tube sealing smelting, and completing a phase formation stage of the phase. A sample after heat treatment is ground and put into a graphite die, and powder is manufactured into a block sample by adopting a rapid hot-pressing sintering technology, thereby being capable of acquiring a Pb<0.98-x>Sr<x>Na<0.02>Se thermoelectric material. Compared with traditional hot-pressing sintering, the preparation method disclosed by the invention has the advantages of uniform heating, high temperature rising speed, short sintering time and the like, and the sintered sample is obvious in performance variation. The thermal conductivity of the material is greatly reduced after being doped with Sr and Na, the Seebeck coefficient is increased, and a thermoelectric material with a high ZT value is acquired.

Description

technical field [0001] The invention relates to a functional composite material and a preparation method thereof, in particular to a PbSe-based thermoelectric composite material and a preparation method thereof, which are applied in the technical field of thermoelectric device material preparation. Background technique [0002] Thermoelectric material is a functional material that utilizes the movement of carriers inside a solid to realize direct mutual conversion of thermal energy and electrical energy. With the development of economy, people's demand for energy is getting higher and higher. Today, the world's energy structure is dominated by fossil energy. However, fossil energy as the main energy source is non-renewable energy. If you use a little, you will use a little less. However, due to the relationship between their own storage capacity and utilization rate, these energy sources cannot fully meet the needs of human production and life. The emergence of thermoelect...

Claims

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Application Information

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IPC IPC(8): H01L35/16
Inventor 骆军陈晖张继业曾李骄开张玉
Owner SHANGHAI UNIV
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