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A self-homogenizing rapid preparation of ag 2 se bulk thermoelectric materials approach
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A thermoelectric material and block technology, which is applied in the field of self-leveling rapid preparation of Ag2Se bulk thermoelectric materials, can solve the problems of lack, strict reaction conditions, polluted environment, etc., and achieves remarkable self-leveling effect and uniform distribution effect.
Active Publication Date: 2017-06-13
WUHAN UNIV OF TECH
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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.
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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;
[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 present invention discloses for the first time a method for rapidly preparing Ag2Se bulk thermoelectric materials through self-homogenization. It uses Ag powder and Se powder as raw materials. First, they are simply mixed, and then the mixed raw materials are directly subjected to plasma activation sintering (PAS). Dense Ag2Se bulk thermoelectric materials can be produced within minutes. The process involved in the present invention is ultra-simple, the preparation time is ultra-short, and the components of the obtained product are evenly distributed, showing a significant effect of self-homogenization. The prepared Ag2Se bulk thermoelectric material has excellent performance, with a room temperature ZT exceeding 0.6, which lays a good foundation for the large-scale preparation and large-scale application of Ag2Se compounds.
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 metalchalcogenide 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...
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