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Method for preparing silver antimony telluride thermoelectric material by low-temperature solid-state reaction combined with hot-pressing process

A silver telluride antimony, solid-phase reaction technology, applied in the direction of thermoelectric device junction lead wire materials, etc., can solve problems such as unfavorable mass production, long-term high-temperature smelting, etc., and achieves simple and controllable hot-pressing process and low reaction temperature. , good repeatability

Inactive Publication Date: 2017-02-22
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As far as industrial production is concerned, the above methods either require long-term high-temperature smelting, or require special preparation equipment, which is not conducive to mass production

Method used

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  • Method for preparing silver antimony telluride thermoelectric material by low-temperature solid-state reaction combined with hot-pressing process
  • Method for preparing silver antimony telluride thermoelectric material by low-temperature solid-state reaction combined with hot-pressing process
  • Method for preparing silver antimony telluride thermoelectric material by low-temperature solid-state reaction combined with hot-pressing process

Examples

Experimental program
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Effect test

Embodiment 1

[0030] A method for preparing a silver antimony telluride thermoelectric material in combination with a low-temperature solid-state reaction combined with a hot-pressing process, comprising the following steps:

[0031] 1) Ingredients: According to the chemical formula AgSbTe 2.02 (i.e. x is 0.02, Te excess 1%) stoichiometric ratio of each element 1:1:2.02 Weigh powdered elemental silver, antimony and tellurium as raw materials, the amount of raw material is 4.5g, wherein elemental silver, tellurium and antimony The particle sizes are 325 mesh, 200 mesh and 200 mesh respectively;

[0032] 2) Briquetting seal: put the raw materials in step 1) into an agate mortar, fully grind them for 30 minutes, and then press them into a cylindrical block with a diameter of 15 mm and a height of 4 mm on a tablet press, and the density of the obtained block is about 89% of the density of silver antimony telluride; put the resulting block into a quartz tube with a diameter of 20 mm and a lengt...

Embodiment 2

[0040] A method for preparing a silver antimony telluride thermoelectric material in combination with a low-temperature solid-state reaction combined with a hot-pressing process, comprising the following steps:

[0041] 1) Ingredients: According to the chemical formula AgSbTe 2 (i.e. x is 0) stoichiometric ratio of each element 1:1:2 Weigh powdery elemental silver, antimony and tellurium as raw material, the quality of raw material is 4.35g;

[0042] 2) Briquetting seal: put the raw materials in step 1) into an agate mortar, fully grind them for 60 minutes, and then press them into a cylindrical block with a diameter of 15 mm and a height of 4 mm on a tablet press, and the obtained block has a density of about 86% of the density of silver antimony telluride; the obtained block is put into a quartz tube with a diameter of 20mm and a length of 12cm, and the -3 Sealed under Pa conditions;

[0043] 3) Solid-state reaction: place the vacuum-sealed quartz tube obtained in step 2) ...

Embodiment 3

[0047] A method for preparing a silver antimony telluride thermoelectric material in combination with a low-temperature solid-state reaction combined with a hot-pressing process, comprising the following steps:

[0048] 1) Ingredients: According to the chemical formula AgSbTe 2.02 (i.e. x is 0.02) the stoichiometric ratio of each element is 1:1:2.02 Weigh powdery elemental silver, antimony and tellurium as raw material, raw material quality is 4.55g;

[0049] 2) Briquetting seal: put the raw materials in step 1) into an agate mortar, fully grind them for 30 minutes, and then press them into a cylindrical block with a diameter of 15 mm and a height of 4 mm on a tablet press, and the density of the obtained block is about 90% of the density of silver antimony telluride; put the resulting block into a quartz tube with a diameter of 20 mm and a length of 12 cm, and vacuum 10 -3 Sealed under Pa conditions;

[0050] 3) The first solid phase reaction: place the vacuum-sealed quartz...

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Abstract

The invention relates to a method for preparation of a silver antimony telluride thermoelectric material by combining low temperature solid phase reaction with hot pressing process. The method comprises the steps of: 1) ingredient compounding: according to the stoichiometric ratio of each element in the chemical formula AgSbTe2+x, weighing elemental silver, elemental tellurium and elemental antimony as raw materials, wherein x is 0-0.02; 2) briquetting sealing; 3) solid phase reaction: raising the temperature of the vacuum-tight block obtained in step 2) to a reaction temperature of 390-450DEG C, and conducting heat preservation for 6-12h to obtain a single phase silver antimony telluride ingot body or approximate single phase silver antimony telluride ingot body; 4) hot-pressing: grinding the obtained ingot and then performing hot pressed sintering, thus obtaining the high density silver antimony telluride thermoelectric material. The method has the characteristics of low reaction temperature, simple and controllable process, low preparation cost, and the prepared silver antimony telluride block material has the advantages of high density, high purity, good repeatability and excellent thermoelectric properties.

Description

technical field [0001] The invention belongs to the field of new energy materials, and in particular relates to a method for preparing silver antimony telluride thermoelectric materials in combination with a low-temperature solid-phase reaction combined with a hot pressing process. Background technique [0002] Thermoelectric power generation is a fully static direct power generation method that uses the thermoelectric effect (Seebeck effect) of semiconductor materials to directly convert heat energy into electrical energy. Thermoelectric power generation devices usually have the advantages of simple equipment structure, low noise, no wear, no leakage, and high long-term reliability. At present, thermoelectric power generation technology has played an important role in military, aerospace, medicine, microelectronics and other fields. As the market's concerns about oil supply and environmental issues such as climate warming become increasingly prominent, thermoelectric power...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/05C22C1/10H01L35/16
Inventor 杜保立宿太超胡保付乔文涛陈亮蔡红新
Owner HENAN POLYTECHNIC UNIV
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