Method for rapid preparation of high performance AgBiSe2 block thermoelectric material

A thermoelectric material and high-performance technology, which is applied in the field of rapid preparation of high-performance AgBiSe2 bulk thermoelectric materials, can solve the problems of complicated reaction process, high equipment requirements, and multiple energy sources, and achieves abundant sources, fast preparation process, and preparation time. short effect

Active Publication Date: 2015-03-11
WUHAN UNIV OF TECH
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  • Claims
  • Application Information

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Problems solved by technology

[0005] Currently reported AgBiSe 2 The synthesis methods of bulk thermoelectric materials are mainly chemical methods and solid-state reaction methods, but the reaction process is cumbersome and complicated, and requires a lot of energy consumption, and the requirements for equipment are also high.

Method used

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  • Method for rapid preparation of high performance AgBiSe2 block thermoelectric material
  • Method for rapid preparation of high performance AgBiSe2 block thermoelectric material
  • Method for rapid preparation of high performance AgBiSe2 block thermoelectric material

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Embodiment 1

[0029] A rapid preparation of high performance AgBiSe 2 A method for a bulk thermoelectric material, comprising the steps of:

[0030] 1) Weigh Ag powder, Bi powder and Se powder according to the stoichiometric ratio of 1:1:2 as raw materials, the total amount is 5g, mix them uniformly in an agate mortar, and use the obtained mixed powder as a reactant, put the reactant Put it into a steel abrasive tool, adopt a pressure of 6 MPa on a tablet press and keep the pressure for 5 minutes to make a Φ12mm ingot;

[0031] 2) Thermal explosion synthesis at different temperatures: the ingot is vacuum-sealed in a quartz glass tube, and then the quartz glass tube is quickly placed in a constant temperature furnace at 830°C, 850°C, and 900°C respectively, taken out after 1 minute, and then cooled naturally;

[0032] The above product was subjected to phase composition analysis. figure 1 It is the XRD pattern of the product in step 2). It can be seen from the figure that very pure AgBiSe ...

Embodiment 2

[0034] A rapid preparation of high performance AgBiSe 2 A method for a bulk thermoelectric material, comprising the steps of:

[0035] 1) According to the stoichiometric ratio of 1:1:2, respectively weigh Ag powder, Bi powder, and Se powder as raw materials. The total amount of raw materials is 5g. Put the reactant into a steel abrasive tool, adopt a pressure of 6 MPa on a tablet press and keep the pressure for 5 minutes to make a Φ12mm ingot;

[0036] 2) Vacuum-seal the ingot obtained in step 1) into a quartz glass tube, then quickly put the quartz glass tube into a constant temperature furnace at 850°C to detonate and initiate a combustion reaction, take it out after 1 min, and cool naturally to obtain a bulk single-phase AgBiSe 2 compound;

[0037] 3) with step 2) gained single-phase AgBiSe 2 The compound is ground into powder, weigh 4.2g of the powder and put it into a Φ15mm graphite mold for compaction, then put the graphite mold into a discharge plasma activation sint...

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Abstract

The invention provides a method for rapid preparation of a high performance AgBiSe2 block thermoelectric material, and the method comprises the following steps: 1) according to the stoichiometric ratio of 1:1:2, respectively weighing Ag powder, Bi powder and Se powder as raw materials, grinding the raw material powder then evenly mixing and pressing into a block; 2) performing thermal explosion reaction on the block obtained in the step 1), and after the reaction, naturally cooling to obtain single phase AgBiSe2 compound; 3) grinding the AgBiSe2 compound obtained in the step 2) into powder, performing discharge plasma activated sintering to obtain the high performance AgBiSe2 block thermoelectric material. According to the method, rapid thermal explosion reaction and discharge plasma activated sintering process are combined for preparation of the AgBiSe2 block thermoelectric material with ZT reaching 0.85 (at 550 DEG C) within 30min, and the method has the advantages of short preparation time, low energy consumption, simple process, low requirements on equipment, suitability for large-scale production, and the like.

Description

technical field [0001] The invention belongs to the technical field of new energy material preparation-combustion synthesis, and specifically relates to a high-performance AgBiSe 2 Rapid preparation method of bulk thermoelectric materials. Background technique [0002] With the gradual reduction of fossil energy and the increasingly serious environmental pollution, the development of new, environmentally friendly renewable energy and energy conversion technologies has attracted great attention from developed countries in the world. Technology (also known as thermoelectric technology) has received widespread attention from all over the world. The thermoelectric effect can directly convert heat energy into electrical energy, effectively recycle waste heat, and greatly alleviate the problem of energy shortage. The conversion efficiency of thermoelectric materials is determined by the dimensionless thermoelectric figure of merit ZT, ZT=α 2 σT / κ where α is the Seebeck coeffici...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05C22C30/00
Inventor 唐新峰刘婵苏贤礼杨东旺
Owner WUHAN UNIV OF TECH
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