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Method used for preparing AgSbTe2 thermoelectric material

A technology of silver antimony telluride and thermoelectric materials, applied in the direction of binary selenium/tellurium compounds, etc., can solve the problems of increasing the preparation cost of the final product silver antimony telluride compounds, restricting the large-scale production and development of thermoelectric materials, and simplifying the preservation of raw materials and operating conditions, optimized electrical transport performance, and excellent performance

Inactive Publication Date: 2015-10-07
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the active chemical properties of metal element silver and antimony, special processes are required for the processing and storage of the elemental raw materials, which virtually increases the preparation cost of the final product silver telluride antimony compound and restricts the large-scale production of this thermoelectric material. to develop

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  • Method used for preparing AgSbTe2 thermoelectric material
  • Method used for preparing AgSbTe2 thermoelectric material
  • Method used for preparing AgSbTe2 thermoelectric material

Examples

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Embodiment 1

[0029] A method for preparing silver antimony telluride thermoelectric material, comprising the steps of:

[0030] 1) Ingredients: Silver telluride and antimony telluride are used as the main raw materials, and a small amount of elemental tellurium is used as a thermoelectric property adjustment component. Silver telluride, antimony telluride and elemental tellurium are weighed as reaction raw materials according to the molar ratio of 1:1:x, x The mass purity of silver telluride is better than 99.99%, the mass purity of antimony telluride is better than 99.999%, and the mass purity of elemental tellurium is better than 99.999%. Both tellurides are in powder form, and the particle size is preferably 200 Under the mesh, the elemental tellurium is in block shape, and it is pre-crushed under the air atmosphere before ball milling to a particle size of less than 1mm;

[0031] 2) High-energy ball milling: Pour the reaction materials described in step 1) into a stainless steel ball m...

Embodiment 2

[0037] A method for preparing silver antimony telluride thermoelectric material, comprising the steps of:

[0038]1) Ingredients: Weigh silver telluride and antimony telluride as the reaction raw materials according to the molar ratio of 1:1, x is taken as 0 (equivalent to the elemental tellurium powder without adding the thermoelectric property adjustment component); the mass purity of silver telluride is better than 99.99% %, the mass purity of antimony telluride is better than 99.999%, both tellurides are in powder form, and the particle size is preferably below 200 mesh;

[0039] 2) High-energy ball milling: Pour the reaction materials described in step 1) into a stainless steel ball milling tank, and ball mill for 8 hours under an inert gas protective atmosphere, with a milling speed of 420 rpm and a ball-to-material ratio of 20, to obtain single-phase silver antimony telluride powder;

[0040] 3) Spark plasma sintering: put the single-phase silver-antimony telluride powd...

Embodiment 3

[0043] A method for preparing silver antimony telluride thermoelectric material, comprising the steps of:

[0044] 1) Ingredients: Silver telluride and antimony telluride are used as the main raw materials, and a small amount of elemental tellurium is used as a thermoelectric property adjustment component. Silver telluride, antimony telluride and elemental tellurium are weighed as reaction raw materials according to the molar ratio of 1:1:x, x The mass purity of silver telluride is better than 99.99%, the mass purity of antimony telluride is better than 99.999%, and the mass purity of elemental tellurium is better than 99.999%. Under 200 mesh, the elemental tellurium is in the form of lumps, pre-crushed to a particle size of less than 1mm before ball milling;

[0045] 2) High-energy ball milling: Pour the reaction materials described in step 1) into a stainless steel ball milling tank, and ball mill for 20 hours under an inert gas protective atmosphere, the ball milling speed ...

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Abstract

The invention relates to a method used for preparing a AgSbTe2 thermoelectric material. The method comprises following steps: 1) material preparation, wherein silver telluride and antimony telluride are taken as main raw materials, trace elemental tellurium is taken as a thermoelectric performance regulating composition, and silver telluride, antimony telluride, and elemental tellurium are weighed at a molar ratio of (0.9-1.1)(0.9-1.1):x as reaction raw materials, and x ranges from 0 to 0.04; 2) high energy ball milling, wherein the raw materials disclosed in step 1) are subjected to high energy ball milling in inert gas protection atmosphere so as to obtain single-phase AgSbTe2 powder; and 3) spark plasma sintering, wherein the single-phase AgSbTe2 powder is subjected to spark plasma sintering so as to obtain the compact AgSbTe2 thermoelectric material. The raw materials are stable in the air; oxidation is not easily caused; the whole technology is simple and controllable; preparation cost is low; repeatability is high; density of the prepared AgSbTe2 block material is high; phase is pure; and thermoelectric performance is excellent.

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. Background technique [0002] Thermoelectric power generation technology is a fully static power generation technology. It realizes direct conversion between thermal energy and electrical energy through the thermoelectric effect (Seebeck effect) of thermoelectric materials. Thermoelectric power generation devices usually have the advantages of simple equipment structure, low noise, no wear, no leakage, and high long-term reliability. The conversion efficiency of thermoelectric devices depends on the performance figure of merit ZT of thermoelectric materials (the characteristic parameter of comprehensive thermoelectric performance of materials) and the temperature difference of the system. The current commercial medium-temperature thermoelectric material is lead telluride. Due to the toxic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B19/04
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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