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Nonstoichiometric ratio Bi-Ag-S series thermoelectric material and preparation method

A non-stoichiometric, thermoelectric material technology, used in thermoelectric device junction lead-out materials, thermoelectric device manufacturing/processing, etc.

Inactive Publication Date: 2010-04-07
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation of non-stoichiometric Bi-Ag-S thermoelectric materials by mechanical alloying and plasma sintering, and the method of reducing resistivity and improving thermoelectric performance by adjusting carrier concentration and main carrier species have not been reported.

Method used

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  • Nonstoichiometric ratio Bi-Ag-S series thermoelectric material and preparation method

Examples

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example 1

[0012] Weigh high-purity (99.99%) Bi powder, Ag powder and S powder according to the molar ratio of Bi:Ag:S 1.999:0.001:3, mix them, put them into a ball mill jar, vacuumize and fill with Ar gas, and cycle three times , make the Ar gas fill the ball mill jar, and seal the ball mill jar. Then put the ball milling jar into the ball mill and mill at 400rpm for 10 hours. After the completion, take out the ball milling jar and inject 100ml of absolute ethanol into the ball milling jar. During this process, keep the Ar gas flowing to avoid damaging the inert protective atmosphere. Wet mill at 250rpm for 30 minutes . Take out the powder and put it into a drying oven to dry at a temperature of 80°C for 2 hours. The dry powder is sintered into a block by spark plasma, the diameter of the mold is 20mm, the heating rate is 100°C / min, the temperature is 300°C, the pressure is 20Pa, and the holding time is 5min. Finally a non-stoichiometric ratio Bi with a cation deficit is obtained 1.9...

example 2

[0014] Weigh high-purity (99.99%) Bi powder, Ag powder, and S powder according to the molar ratio of Bi:Ag:S 1.99:0.01:3, mix them, put them into a ball mill jar, vacuumize and fill with Ar gas, and cycle three times , make the Ar gas fill the ball mill jar, and seal the ball mill jar. Then put the ball mill jar into the ball mill, 450rpm ball mill for 15h, take out the ball mill jar after completion, inject 100ml of absolute ethanol into the ball mill jar, during this process, keep Ar gas circulation, so as not to destroy the inert protective atmosphere, 300rpm wet mill for 1h. Take out the powder and put it into a drying oven to dry at a temperature of 80°C for 2 hours. The dried powder is sintered into a block by spark plasma, the diameter of the mold is 10mm, the heating rate is 100°C / min, the temperature is 550°C, the pressure is 60Pa and the holding time is 5min. Finally a non-stoichiometric ratio Bi with a cation deficit is obtained 1.99 AgS 3 It is a thermoelectric ...

example 3

[0016] Weigh high-purity (99.99%) Bi powder, Ag powder and S powder according to the molar ratio of Bi:Ag:S 1:1:3, mix them, put them into a ball mill jar, vacuumize and fill with Ar gas, and cycle three times , make the Ar gas fill the ball mill jar, and seal the ball mill jar. Then put the ball milling jar into the ball mill, 300rpm ball milling for 20h, take out the ball milling jar after completion, inject 100ml of absolute ethanol into the ball milling jar, during this process, keep Ar gas circulation, so as not to destroy the inert protective atmosphere, 200rpm wet milling for 3h. Take out the powder and put it into a drying oven to dry at a temperature of 80°C for 2 hours. The dried powder is sintered into a block by spark plasma, the diameter of the mold is 25mm, the heating rate is 100°C / min, the temperature is 600°C, the pressure is 40Pa, and the holding time is 5min. Finally, a non-stoichiometric BiAgS with a cation deficit is obtained 3 It is a thermoelectric mat...

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Abstract

The invention discloses a nonstoichiometric ratio Bi-Ag-S series thermoelectric material and a preparation method, and belongs to the technical field of energy materials. The method for preparing the nonstoichiometric ratio Bi-Ag-S material provided by the invention is characterized in that: high-purity metal simple substance Bi, Ag powder and high-purity S powder are used as raw materials and are prepared according to a chemical general formula of Bi2-xAgxS3 and Bi2-xAg3xS3-y (wherein the x is the molar fraction of an Ag component, the value range of the x is more than or equal to 0.001 and less than or equal to 1, the y is the molar fraction of the lacking amount of a sulfur element, and the value range of the y is more than 0 and less than or equal to 1.5); and the raw materials are synthesized into compound powder by adopting a mechanical alloying method, and then the compound powder is sintered through discharge plasma to form blocks. The method can simply, conveniently and accurately prepare the nonstoichiometric ratio Bi-Ag-S series block material, control the thickness of material carriers and the category of main carriers through the nonstoichiometric ratio of the components, and improve the thermoelectric performance.

Description

technical field [0001] The invention belongs to the technical field of energy materials, and in particular relates to a non-stoichiometric Bi-Ag-S thermoelectric material and a preparation method thereof, and relates to mechanical alloying and discharge plasma sintering processes. Background technique [0002] With the development of science and technology and productivity, human beings' demand for energy is increasing day by day. On the one hand, the use of a large amount of fossil fuels has caused serious environmental pollution, and on the other hand, its own reserves are also decreasing. Thermoelectric materials are energy materials that can directly convert heat and electricity. The wide use of thermoelectric materials can effectively utilize energy, such as thermoelectric power generation; protect the environment, such as thermoelectric refrigeration. [0003] Bi 2 Te 3 It is currently the thermoelectric material with the best performance at room temperature and has ...

Claims

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Application Information

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IPC IPC(8): H01L35/16H01L35/34
Inventor 张波萍葛振华于一强尚鹏鹏陈晨陈跃星
Owner UNIV OF SCI & TECH BEIJING
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