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Self-propagating high-temperature rapid one-step synthesis thermoelectric material powder with nanostructure Cu2Se method

A self-propagating high-temperature, nano-structured technology, applied in the field of new energy material preparation-self-propagating high-temperature synthesis, can solve the problems of destroying the stoichiometric ratio of Cu2Se, difficult to precisely control the stoichiometric ratio of products, and influence of sample performance repeatability, etc. The effect of short time, fast response and low cost

Active Publication Date: 2013-06-19
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

Due to the low melting point of Se (221 °C), Se volatilizes severely during the long-term melting annealing and solid-state reaction, thereby destroying the Cu 2 The stoichiometric ratio of Se has a great influence on the repeatability of the sample performance
The ball milling heating and pressing method is not easy to accurately control the stoichiometric ratio of the product, and has high requirements for equipment

Method used

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  • Self-propagating high-temperature rapid one-step synthesis thermoelectric material powder with nanostructure Cu2Se method
  • Self-propagating high-temperature rapid one-step synthesis thermoelectric material powder with nanostructure Cu2Se method
  • Self-propagating high-temperature rapid one-step synthesis thermoelectric material powder with nanostructure Cu2Se method

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Experimental program
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Effect test

Embodiment 1

[0025] Self-propagating high-temperature rapid one-step synthesis of Cu with nanostructure 2 The method for Se thermoelectric material powder, its steps are as follows:

[0026] (1) Take Cu powder and Se powder as raw materials, weigh Cu powder and Se powder according to the stoichiometric ratio Cu:Se=2:1, and weigh a total of 15g. Mix the raw materials evenly in an agate mortar to obtain a mixed Powder;

[0027] (2) Put the uniformly mixed powder into a steel abrasive tool, press it into a f12mm block with a pressure of 10MPa on a tablet press, and then put it into a quartz glass tube (with an inner diameter of 17mm and an outer diameter of 20mm) , in an air atmosphere, put the bottom end of the quartz glass tube on a gas flame and heat it directly until the self-propagating reaction occurs, that is, the naked eye can see that there is a bright light at the heating end of the reactant, then stop heating, and cool naturally after the reaction is completed obtained nanostruct...

Embodiment 2

[0030] Self-propagating high-temperature rapid one-step synthesis of Cu with nanostructure 2 The method for Se thermoelectric material powder, its steps are as follows:

[0031] (1) Take Cu powder and Se powder as raw materials, weigh Cu powder and Se powder according to the stoichiometric ratio Cu:Se=2:1, and weigh the total amount to 25g. Mix the raw materials evenly in an agate mortar to obtain a mixed Powder;

[0032] (2) Press the uniformly mixed powder into a block, then put it into a quartz glass tube, vacuumize and seal it, put the vacuum-sealed quartz glass tube into a muffle furnace at 500°C and heat it until the self-propagating reaction After the reaction, the heating is stopped, and after the reaction is completed, it is naturally cooled to obtain Cu with nanostructure 2 Se thermoelectric material.

[0033] image 3 The XRD spectrum of the product that is the present embodiment obtains, as can be seen from the figure, the product obtained after the self-propag...

Embodiment 3

[0035] The difference from Example 2 is that the reactant vacuum-sealed in the quartz glass tube is placed in a 400°C muffle furnace, and a single-phase Cu is obtained through a self-propagating reaction. 2 Se compounds.

[0036] Cu prepared according to this embodiment 2 The XRD of Se powder see Figure 4 .

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Abstract

The invention provides a self-propagating high-temperature rapid one-step synthesis thermoelectric material powder with nanostructure Cu2Se method. The method includes: preparing stoichiometry of Cu powder and Se powder as 2 to 1 as raw materials, evenly mixing Cu powder with Fe powder to have reactants, adopting direct detonating or constant temperature detonating to trigger self-propagating reaction, natural cooling after reaction achievement and acquiring thermoelectric material powder with nanostructure Cu2Se. The method has the advantages of adoption of self-propagating high-temperature synthetic process, reaction for a short time, simple technique, low facility requirement, low energy consumption and environment friendliness. Further, stoichiometry of products is controlled accurately. Even distribution nanostructure is formed at normal positions.

Description

technical field [0001] The invention belongs to the technical field of new energy material preparation-self-propagating high-temperature synthesis, and specifically relates to a self-propagating high-temperature rapid one-step synthesis of Cu with nanostructure 2 The method of Se thermoelectric material powder. Background technique [0002] In the past ten years, with the rapid growth of the world population and the rapid development of the global economy, the global energy crisis and environmental pollution problems have become increasingly serious. Therefore, the development of environment-friendly new energy and new energy conversion technology has become a foreword subject of international focus. Thermoelectric conversion technology can use the Seebeck effect and Peltier effect of thermoelectric materials to realize the mutual conversion between electric energy and heat energy. It has the advantages of no transmission parts, small size, no noise, no pollution, and good ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L35/16B82Y40/00C01B19/04H10N10/852
Inventor 唐新峰付帆张海龙任广坤
Owner WUHAN UNIV OF TECH
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