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Method for preparing AgSbTe2 thermoelectric material by combining fusant rotatable swinging and spark plasma sintering

A technology of discharge plasma and silver antimony telluride, which is applied in the field of preparation of thermoelectric compounds, can solve problems such as difficult preparation, and achieve the effects of saving preparation cycle, high thermoelectric performance, and high thermoelectric performance

Active Publication Date: 2010-06-16
武汉经开科创运营有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

AgSbTe 2 The compound is generally prepared by the zone melting method, but the grown material contains a small amount of Ag at the grain boundary 2 Te or other heterophase, while AgSbTe 2 Slowly decomposes to Sb at low temperature 2 Te 3 or Ag 2 Te, so it is difficult to prepare single-phase AgSbTe 2 compound

Method used

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  • Method for preparing AgSbTe2 thermoelectric material by combining fusant rotatable swinging and spark plasma sintering
  • Method for preparing AgSbTe2 thermoelectric material by combining fusant rotatable swinging and spark plasma sintering
  • Method for preparing AgSbTe2 thermoelectric material by combining fusant rotatable swinging and spark plasma sintering

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Embodiment 1

[0029] The method for preparing the silver antimony telluride thermoelectric material in combination with the melt spin-spinning and spark plasma sintering comprises the following steps:

[0030] 1) Ingredients: Filamentous Ag, massive Te and granular Sb are used as starting materials, according to the chemical formula AgSbTe 2 Weighing (i.e. x=0), wherein the mass purity of filamentous Ag is ≥99.95%, the mass purity of bulk Te is ≥99.999%, and the mass purity of granular Sb is ≥99.9999%;

[0031] 2) Preparation of master alloy: Mix filamentous Ag, massive Te and granular Sb, then put them into a melting furnace, slowly heat to 700°C at a heating rate of 1°C / min, melt for 9 hours, and then heat at 1°C / min The cooling rate of min is slow to cool down to 550°C and then quenched in supersaturated brine to obtain a master alloy (ingot with dense metallic luster);

[0032] 3) Preparation of strip-shaped product: After rough grinding, the master alloy is pressed into a cylinder wit...

Embodiment 2

[0035] The method for preparing the silver antimony telluride thermoelectric material in combination with the melt spin-spinning and spark plasma sintering comprises the following steps:

[0036] 1) Ingredients: Filamentous Ag, massive Te and granular Sb are used as starting materials, according to the chemical formula AgSbTe 2.02 Weighing (i.e. x=0.02), wherein the mass purity of filamentous Ag is ≥99.95%, the mass purity of bulk Te is ≥99.999%, and the mass purity of granular Sb is ≥99.9999%;

[0037] 2) Preparation of master alloy: Mix filamentous Ag, massive Te and granular Sb, then put them into a melting furnace, slowly heat to 700°C at a heating rate of 1°C / min, melt for 8 hours, and then heat at 1°C / min The cooling rate of min is slow to cool down to 550°C and then quenched in supersaturated brine to obtain a master alloy (ingot with dense metallic luster);

[0038] 3) After the master alloy is ground, press it into a cylinder with a diameter of 15 mm and a height of ...

Embodiment 3

[0042] The method for preparing the silver antimony telluride thermoelectric material in combination with the melt spin-spinning and spark plasma sintering comprises the following steps:

[0043] 1) Ingredients: Filamentous Ag, massive Te and granular Sb are used as starting materials, according to the chemical formula AgSbTe 2.08 Weighing (i.e. x=0.08), wherein the mass purity of filamentous Ag is ≥99.95%, the mass purity of bulk Te is ≥99.999%, and the mass purity of granular Sb is ≥99.9999%;

[0044] 2) Preparation of master alloy: Mix filamentous Ag, massive Te and granular Sb, then put them into a melting furnace, slowly heat to 700°C at a heating rate of 1°C / min, melt for 10 hours, and then heat at 1°C / min The cooling rate of min is slow to cool down to 550°C and then quenched in supersaturated brine to obtain a master alloy (ingot with dense metallic luster);

[0045] 3) After the master alloy is ground, press it into a cylinder with a diameter of 15 mm and a height of...

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Abstract

The invention relates to a method for preparing a thermoelectric compound. The method for preparing a AgSbTe2 thermoelectric material by combining fusant rotatable swinging and discharge plasma sintering is characterized by comprising the following steps of: (1) mixing; weighing thread-shaped Ag, block-shaped Te and granular Sb as initial raw materials according to a chemical formula AgSbTe2+x, wherein x is equal to 0-0.08; (2) preparing mother alloy; mixing the thread-shaped Ag, the block-shaped Te and the granular Sb, placing the mixture into a smelting furnace, heating to 700 DEG C, smelting for 8-10 hours, cooling to 550 DEG C and then quenching in supersaturated saline water to obtain the mother alloy; (3) grinding and tabletting the mother alloy, placing the mother alloy into an induction heating furnace to melt to form a fusant and then rotatably swinging the fusant to obtain a band-shaped product having an amorphous / nanocrystal composite structure; and (4) grinding the band-shaped product having an amorphous / nanocrystal composite structure and carrying out spark plasma sintering to obtain the AgSbTe2 thermoelectric material. The method has short preparation period, low cost, pure phase, simple and easy control of process, safety and no pollution.

Description

technical field [0001] The invention belongs to the field of new energy materials, and in particular relates to a preparation method of a thermoelectric compound. Background technique [0002] Energy is an important material basis for the survival and development of modern human beings. At present, more than 90% of the world's energy is provided by fossil fuels such as coal, oil and natural gas. However, according to the current speed of use, these fossil energy sources will be exhausted in the near future; in addition, a large amount of CO, CO2 will be produced during the combustion of fossil fuels. 2 , SO 2 , NO, smoke and other harmful gases, causing serious environmental pollution. Thermoelectric power generation is a fully static direct power generation method that uses thermoelectric conversion materials to convert heat energy into electrical energy. It has the advantages of compact structure, reliable performance, no noise during operation, no wear, no leakage, and...

Claims

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Application Information

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IPC IPC(8): C22C1/03B22D11/06B22F3/105
Inventor 唐新峰杜保立徐静静罗文辉
Owner 武汉经开科创运营有限公司
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