A method for rapid screening of performance-optimized thermoelectric materials

A thermoelectric material and performance technology, applied in the measurement of electricity, measurement of electrical variables, instruments, etc., can solve the problems of large workload, low efficiency, long experimental period, etc., to improve the density and efficiency, simplify the synthesis process, and shorten the preparation period. Effect

Active Publication Date: 2019-10-25
WUHAN UNIV OF TECH
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AI Technical Summary

Problems solved by technology

Therefore, the traditional method of "preparing one composition at a time" requires long experimental periods, heavy workload, low efficiency and high cost when exploring new material systems.

Method used

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  • A method for rapid screening of performance-optimized thermoelectric materials
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  • A method for rapid screening of performance-optimized thermoelectric materials

Examples

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example 1

[0027] A method for rapidly screening Bi-Sb-Te-based high-performance thermoelectric materials, the specific steps are as follows:

[0028] 1) Using high-purity Sb block (6N), Bi block (6N) and Te block (6N) as starting materials, according to the stoichiometric ratio Bi 2 Te 3 , Sb 2 Te 3 For batching, put them in quartz glass tubes and vacuum seal them, then put them into a vertical melting furnace for reaction, heat up at a rate of 4°C / min, keep at 800°C for 6h, and get an ingot after cooling with the furnace;

[0029] 2) Grind the ingot to get powder, weigh 4g Sb 2 Te 3 The single-phase powder is put into a graphite mold with a diameter of 12.7mm and then sintered in a plasma-activated sintering equipment. The vacuum condition is below 10Pa, the pressure is 30MPa, the temperature is 500℃, and the holding time is 5min to obtain a dense block;

[0030] 3) Put 4g Bi 2 Te 3 The powder is poured pre-loaded with Sb 2 Te 3 The block is re-sintered in a graphite mold with...

Embodiment 1

[0041] Based on the above exploration, the present invention provides a rapid screening GeTe-Sb 2 Te 3 The method for thermoelectric materials with system performance optimization, the specific steps are as follows:

[0042] 1) Using high-purity Ge blocks (4N), Sb blocks (6N), Te blocks (6N) as starting materials, according to GeTe, Sb 2 Te 3 The stoichiometric ratio is used for batching, and the obtained batches are respectively placed in quartz glass tubes and then vacuum-sealed, and then put into a vertical melting furnace for reaction. For the GeTe compound, after 4 hours, it is raised to 1000 ° C, and after 20 hours of heat preservation, then Furnace cooling to obtain a GeTe compound ingot, for Sb 2 Te 3 The compound was raised to 750°C after 3 hours, kept for 10 hours and then cooled with the furnace to obtain Sb 2 Te 3 compound ingot;

[0043] 2) The resulting GeTe compound ingot and Sb 2 Te 3 The compound ingots were ground into powder respectively, and 4g of ...

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Abstract

The invention discloses a rapid screening method of the thermoelectric material with optimized performance; the method comprises the following steps: firstly using a plasma activation sintering technology to prepare a multi-element chalcogenide system diffusion couple, thus obtaining a block material sample bank with rich compositions and microstructures; combining an EPMA (electron probe X ray microscopic analyzer), a FESEM (field emission scan electron microscope) with a PSM (conductivity-Seebeck coefficient scan probe microscope) symptom technologies so as to study the relations between the sample bank composition, structure and thermoelectricity performance, thus screening out the high performance thermoelectric material with specific compositions and microstructures with high flux. The method can effectively improve the information density and efficiency obtained by tests, thus obvious reducing test needing manpower, material resources and cost, and searching the thermoelectric material with excellent performance with high efficiency.

Description

technical field [0001] The invention belongs to the technical field of material preparation and characterization, and in particular relates to a method for quickly screening thermoelectric materials with optimized performance. Background technique [0002] Thermoelectric power generation technology utilizes the Seebeck effect of thermoelectric materials to realize the direct conversion of thermal energy to electrical energy, and has important application prospects in the fields of industrial waste heat recovery, automobile exhaust waste heat power generation, and solar photovoltaic-thermoelectric hybrid power generation. Thermoelectric materials are key materials in thermoelectric power generation technology, and their performance directly determines the efficiency and cost of thermoelectric power generation. The performance of thermoelectric materials is measured by dimensionless figure of merit ZT=α 2 σT / κ means that a good thermoelectric material should have a large Seeb...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/00
CPCG01R31/00
Inventor 鄢永高周梦兰唐新峰苏贤礼张健
Owner WUHAN UNIV OF TECH
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