Method for quickly preparing Ag2Se block thermoelectric material through self-homogenization

A technology of thermoelectric materials and blocks, which is applied in the field of self-homogenization and rapid preparation of Ag2Se block thermoelectric materials, can solve problems such as lack, strict reaction conditions, and environmental pollution, and achieve significant self-homogenization effects and uniform distribution effects

Active Publication Date: 2015-09-02
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the synthesis methods of compounds Ag2Se and Ag2Te mainly focus on hydrothermal method and solvothermal method, etc. These methods of preparing Ag2Se and Ag2Te in solution often require complex reaction processes and strict reaction conditions
What's more regrettable is that some toxic chemical reagents need to be used, which consumes time and energy and pollutes the environment
However, the conventional long-term high-temperature melting method and high-temperature solid-state reaction method have strict requirements on equipment, and consume energy at the same time, which is easy to cause the lack of Se, and it is difficult to accurately control the composition.

Method used

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  • Method for quickly preparing Ag2Se block thermoelectric material through self-homogenization
  • Method for quickly preparing Ag2Se block thermoelectric material through self-homogenization
  • Method for quickly preparing Ag2Se block thermoelectric material through self-homogenization

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Embodiment 1

[0034] A self-homogenization rapid preparation of Ag 2 The method of Se bulk thermoelectric material (sintering temperature is 400 ℃, 440 ℃ and 480 ℃ respectively), the specific steps are as follows:

[0035] 1) Using Ag powder and Se powder as raw materials, weigh Ag powder and Se powder at a molar ratio of 2:1, a total of 3 parts, 5g each, numbered A, B, and C respectively;

[0036] 2) Put each raw material in an agate mortar and pre-mix it with a medicine spoon for 7 minutes to obtain a mixed powder (mixed raw material);

[0037] 3) Put the mixed powder into a Φ16mm graphite mold for compaction, then put the graphite mold into the plasma activation sintering (PAS) equipment, and sinter under the vacuum condition below 10Pa, the axial pressure is 40MPa, after 2min to reach The target sintering temperature is 400°C for A, 440°C for B, and 480°C for C, and the holding time is 3 minutes. After the sintering is completed, it is cooled to room temperature with the furnace, and t...

Embodiment 2

[0040] A self-homogenization rapid preparation of Ag 2 The method of Se block thermoelectric material, concrete steps are as follows:

[0041] 1) Using Ag powder and Se powder as raw materials, Ag powder and Se powder are weighed in a molar ratio of 2:1, a total of 5g;

[0042] 2) Put the raw materials in an agate mortar and pre-mix them with a medicine spoon for 1 min. It can be clearly seen that the Ag powder and Se powder are enriched, and a mixed powder (mixed raw material) is obtained;

[0043]3) Put the mixed powder into a Φ16mm graphite mold for compaction, then put the graphite mold into the plasma activation sintering (PAS) equipment, and sinter under the vacuum condition below 10Pa, the axial pressure is 40MPa, and it reaches 440℃ after 2min (Target sintering temperature), the holding time is 3min, and after sintering, it is cooled to room temperature with the furnace to obtain Ag 2 Se bulk thermoelectric materials.

[0044] The product obtained in this embodiment...

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Abstract

The invention discloses a method for quickly preparing an Ag2Se block thermoelectric material through self-homogenization for the first time. Ag powder and Se powder are used as raw materials; firstly the raw materials are easily mixed, and then the mixed raw materials are directly subjected to plasma activated sintering (PAS), so compact Ag2Se block thermoelectric material can be prepared in several minutes. The process dissolved by the method is super easy, the preparation time is super short, the obtained product is uniform in component distribution, and an obvious effect of self-homogenization is shown. The prepared Ag2Se block thermoelectric material is superior in performance, the room temperature ZT exceeds 0.6, and a good foundation is laid for large-scale preparation and large-scale application of the Ag2Se compound.

Description

technical field [0001] The invention belongs to the technical field of thermoelectric material preparation, in particular to a self-homogenization rapid preparation of Ag 2 A method for Se bulk thermoelectric materials. Background technique [0002] In the field of material science, transition metal chalcogenides have aroused widespread interest among researchers due to their special photoelectric properties and chemical properties, which has led to the development of transition metal chalcogenide preparation technology. [0003] Among many transition metal chalcogenides, the compound Ag 2 Se has always been one of the substances that have attracted widespread attention. Ag 2 Se is a narrow-bandgap semiconductor material that undergoes a reversible phase transition (orthorhombic system-body-centered cubic system) at 406K. Before and after the phase transition, the electrical properties of the compound undergo a sudden change, mainly due to the significant change in the en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/04C22C5/06H01L35/34
Inventor 唐新峰杨东旺姚磊苏贤礼鄢永高
Owner WUHAN UNIV OF TECH
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