Method for preparing silver antimony telluride thermoelectric material by taking binary tellurides as start raw materials

A technology of silver antimony telluride and thermoelectric materials, which is applied in the directions of thermoelectric device junction lead-out materials, thermoelectric device manufacturing/processing, etc. Complex operation steps and other problems, to achieve the effect of easy realization of preparation conditions, easy preparation time and good repeatability

Inactive Publication Date: 2015-09-30
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the active chemical properties of simple raw materials, its harsh storage conditions and complicated operation steps inevitably increase the complexity and non-repeatability of the preparation process, which restricts the large-scale production and development of materials.

Method used

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  • Method for preparing silver antimony telluride thermoelectric material by taking binary tellurides as start raw materials
  • Method for preparing silver antimony telluride thermoelectric material by taking binary tellurides as start raw materials
  • Method for preparing silver antimony telluride thermoelectric material by taking binary tellurides as start raw materials

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Embodiment 1

[0031] A method for preparing a silver antimony telluride thermoelectric material using binary telluride as a starting material comprises the following steps:

[0032] 1) Ingredients: According to the silver telluride-antimony telluride pseudo-binary phase diagram, silver telluride and antimony telluride are weighed as starting materials according to the molar ratio of 1:1 (equivalent to (50-x):(50+x ) in the ratio of x=0, the amount of the starting material corresponds to the strictly stoichiometric silver antimony telluride compound), wherein 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, with a particle size of less than 200 mesh;

[0033] 2) Briquetting sealing: put the starting material described in step 1) into an agate mortar, fully grind it for 60 minutes under an air atmosphere, and then press it into several cylindrical blocks with a diameter of 12.7 mm and a...

Embodiment 2

[0040] A method for preparing a silver antimony telluride thermoelectric material using binary telluride as a starting material comprises the following steps:

[0041] 1) Ingredients: silver telluride and antimony telluride are weighed as starting materials according to the molar ratio of 48:52 (equivalent to x=2 in the ratio of (50-x):(50+x)), wherein, silver telluride The mass purity is better than 99.99%, and the mass purity of antimony telluride is better than 99.999%. Both tellurides are in powder form, and the particle size is below 200 mesh;

[0042] 2) Briquetting and sealing: put the raw materials in step 1) into an agate mortar, fully grind them for 60 minutes in an air atmosphere, and then press them into several cylindrical blocks with a diameter of 12.7 mm and a height of about 3 mm on a tablet press. The density of the obtained block is about 82% of the density of silver antimony telluride; the obtained block is placed in a quartz tube with a diameter of 15 mm an...

Embodiment 3

[0048] A method for preparing a silver antimony telluride thermoelectric material using binary telluride as a starting material comprises the following steps:

[0049] 1) Ingredients: Silver telluride and antimony telluride are weighed as starting materials according to the molar ratio of 44:56 (equivalent to x=6 in the ratio of (50-x):(50+x), wherein the mass of silver telluride The purity is better than 99.99%, and the mass purity of antimony telluride is better than 99.999%. Both tellurides are in powder form, and the particle size is below 200 mesh;

[0050] 2) Briquetting seal: Put the raw materials in step 1) into an agate mortar, grind them fully for 30 minutes under air atmosphere, and then press them into several cylindrical blocks with a diameter of 12.7 mm and a height of about 3.5 mm on a tablet press , the density of the obtained block is about 73% of the density of silver antimony telluride; the obtained block is put into a quartz tube with a diameter of 15 mm an...

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Abstract

The invention relates to a method for preparing a silver antimony telluride thermoelectric material by taking binary tellurides as start raw materials. The method comprises the following specific steps: 1) weighing silver telluride and antimony telluride at a certain molar ratio as start raw materials; 2) uniformly mixing the start raw materials in the step 1), pressing into a block and performing vacuum sealing; 3) heating the block obtained after the vacuum sealing in the step 2) to a reaction temperature of 420-500 DEG C, and reacting for 3-12h to obtain a single-phase or near single-phase silver antimony telluride ingot; and 4) grinding the ingot obtained in the step 3), and performing spark plasma sintering to obtain a dense silver antimony telluride thermoelectric material. The raw materials adopted in the method are stable in air and hardly oxidized, and large-scale and low-cost production is easy to realize; a protective atmosphere is not needed the storage and mixing processes of the raw materials, the reaction temperature is low, the process is simple and controllable, the preparation cost is low, and the repeatability is good; and the prepared silver antimony telluride block material has high density and excellent thermoelectric performance.

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 by using binary telluride as a starting material. Background technique [0002] Thermoelectric materials are functional materials that utilize the thermoelectric effect (Seebeck effect) and Peltier effect (Peliter effect) of semiconductor materials to realize direct conversion between thermal energy and electrical energy. The thermoelectric power generation device is a fully static power generation technology that does not require cylinders, pistons and complex power transmission devices that are necessary for traditional heat engines. 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, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05C22C1/10H01L35/34H01L35/16
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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