Method for preparing high-performance AgInTe2 thermoelectric material

A high-performance technology for thermoelectric materials, applied in the field of preparation of high-performance AgInTe2 thermoelectric materials, can solve the problems of difficult control of the single-phase state of the product, unstudied thermoelectric properties, and complex sources of raw materials, etc., to achieve good product composition, short preparation cycle, and raw materials The effect of a wide range of sources

Inactive Publication Date: 2016-03-23
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Currently mainly composed of Ag 2 Te and In 2 Te 3 Preparation of bulk AgInTe as starting material by melting annealing quenching combined with hot pressing sintering 2 Thermoelectric materials have complex sources of raw materials, complex processes, and long preparation cycles. The single-phase state of the resulting products is difficult to control and has low density. Only the thermoelectric properties from room temperature to 327°C have been studied, and the thermoelectric properties at higher temperatures have not been studied. , complex process and low thermoelectric performance limit its application and development

Method used

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  • Method for preparing high-performance AgInTe2 thermoelectric material
  • Method for preparing high-performance AgInTe2 thermoelectric material
  • Method for preparing high-performance AgInTe2 thermoelectric material

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Embodiment 1

[0033] A preparation of high-performance AgInTe 2 A method for thermoelectric materials, comprising the steps of:

[0034] 1) According to the chemical formula (Ag 2 Te) 1-x (In 2 Te 3 ) x The stoichiometric ratio of each element in (x=0.50) takes Ag wire, In particle and Te block as raw material,

[0035] 2) Vacuum-seal the block obtained in step 1) into a quartz glass tube, then place it in a melting furnace, raise the temperature to 1000°C at 2°C / min and keep it warm for 24h, and quench it in saturated brine to obtain an ingot;

[0036] 3) Vacuum-seal the ingot body obtained in step 2) into a quartz glass tube, raise the temperature in a muffle furnace at 3°C / min to 400°C for 24h, 72h and 120h respectively, and then air cool to room temperature;

[0037]4) Grind the ingot obtained in step 3) into powder, and perform plasma-activated sintering (PAS): put the obtained powder into a graphite mold with a diameter of 16mm for compaction, and then under the conditions of a ...

Embodiment 2

[0041] A method for preparing high-performance AgInTe2 thermoelectric material, it comprises the following steps:

[0042] 1) According to the chemical formula AgInTe 2 The stoichiometric ratio of each element in the method weighs Ag wire, In particles and Te block as raw materials;

[0043] 2) Vacuum-seal the block obtained in step 1) into a quartz glass tube, then place it in a melting furnace, raise the temperature to 1000°C at 2°C / min and keep it warm for 24h, and quench it in saturated brine to obtain an ingot;

[0044] 3) Vacuum-seal the ingot body obtained in step 2) into a quartz glass tube, and raise the temperature to 400°C in a muffle furnace at 3°C / min for 72h;

[0045] 4) Grinding the obtained product in step 3) into powder, performing plasma activated sintering (PAS), packing the powder into a graphite mold with a diameter of 16 mm for compaction, and then sintering under the condition that the vacuum degree is less than 10 Pa and the sintering pressure is 45 MP...

Embodiment 3

[0049] A preparation of high-performance AgInTe 2 A method for thermoelectric materials, comprising the steps of:

[0050] 1) According to the chemical formula (Ag 2 Te) 1-x (In 2 Te 3 ) x The stoichiometric ratio of each element in the scale takes Ag wire, In particles and Te blocks as raw materials, where x is 0.50, 0.52, 0.54 and 0.56 respectively, that is, AgInTe 2 ;

[0051] 2) Vacuum-seal the raw material obtained in step 1) into a quartz glass tube, then place it in a melting furnace, raise the temperature to 1000°C at a rate of 2°C / min and keep it for 24h, and then quench it in saturated brine to obtain an ingot;

[0052] 3) Vacuum-seal the ingot body obtained in step 2) into a quartz glass tube, then place it in a muffle furnace and heat it up to 400°C at a rate of 3°C / min for 72h;

[0053] 4) Grind the product obtained in step 3) into powder and carry out plasma activation sintering (PAS). Sintering under the conditions of 100°C / min to 450°C at a heating rate...

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Abstract

The invention discloses a method for preparing a high-performance AgInTe2 thermoelectric material. The melting technique, the annealing technique and the spark plasma activated sintering (PAS) technique are combined. The method comprises the steps of 1, weighing Ag wires, In particles and Te blocks which are taken as raw materials according to the stoichiometric ratio of elements in the chemical formula (Ag2Te)1-x(In2Te3)x, wherein x=0.50-0.56; 2, evenly mixing the raw materials, sealing the mixture in a vacuum quartz glass tube, conducting melting, and obtaining ingots after quenching; 3, sealing the obtained ingots in a vacuum quartz glass tube and conducting annealing; 4, grinding the product obtained from the step 3 into powder, placing the powder in a graphite die, and conducting spark PAS to obtain the blocky monophasic AgInTe2 thermoelectric material. The raw materials have wide sources, the preparing technology is simple, and the product has high thermoelectricity, high stability and high density and is suitable for application and popularization.

Description

technical field [0001] The invention belongs to the technical field of preparation of new energy materials, and in particular relates to a preparation of high-performance AgInTe 2 methods for thermoelectric materials. Background technique [0002] Energy and environmental issues have become key issues in the 21st century. The urgent need for energy sources other than fossil fuels, as well as the efficient use of current fossil fuels, promote research on alternative energy sources and various types of energy conversion technologies. One of the energy conversion technologies that has gained widespread attention is thermoelectric conversion technology. Materials that can directly convert heat energy into electrical energy are called thermoelectric materials. Thermoelectric materials are becoming more and more important in the fields of power generation and refrigeration equipment. [0003] Thermoelectric materials can realize direct mutual conversion between thermal energy an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/02C22C1/10B22F3/105
CPCB22F3/105C22C1/02C22C1/1036
Inventor 刘桃香杜慧真唐新峰苏贤礼鄢永高
Owner WUHAN UNIV OF TECH
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