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Ultrafast synthetic method of Ag2X block thermoelectric material

A technology of thermoelectric materials and synthesis methods, applied in the direction of thermoelectric device junction lead-out materials, etc., can solve the problems of strict reaction conditions, difficult to accurately control components, and harsh equipment requirements, etc., achieve simple preparation process, realize precise control, and solve volatilization problem effect

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

AI Technical Summary

Problems solved by technology

Currently, compound Ag 2 Se, Ag 2 The synthesis methods of Te mainly focus on hydrothermal method, solvothermal method, etc., which prepare Ag in solution. 2 Se, Ag 2 Te's method often requires complex reaction process 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 preparation by conventional long-term high-temperature melting method and high-temperature solid-state reaction method requires strict equipment requirements and consumes energy, which is likely to cause the absence of Se or Te, and it is difficult to accurately control the composition.

Method used

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  • Ultrafast synthetic method of Ag2X block thermoelectric material
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  • Ultrafast synthetic method of Ag2X block thermoelectric material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] a kind of Ag 2 The ultra-fast synthesis method of Se bulk thermoelectric materials, the specific steps are as follows:

[0033] 1) Weigh Ag powder and Se powder according to the molar ratio of 2:1, a total of 5g, mix with a medicine spoon for 7 minutes, put the resulting mixed raw materials into a Φ15mm stainless steel mold, and then put the mold into a 769YP-24B manual Carry out pre-compression (10min under 5MPa under pressure) in the powder tabletting machine (24T), demoulding obtains compact;

[0034] 2) Take a large and small molybdenum "cup" container with matching size (the large cup can be fastened on the small cup to play a sealing role), fill the compact into the small "cup", and then buckle the large cup "cup";

[0035] 3) Assembling the molybdenum "cup" container filled with the compact in step 2) into the pyrophyllite pressure transmission medium;

[0036] 4) The pyrophyllite assembly obtained in step 3) is placed in the CS-IIID synthetic diamond hydrauli...

Embodiment 2

[0041] a kind of Ag 2 The ultra-fast synthesis method of Te bulk thermoelectric materials, the specific steps are as follows:

[0042] 1) Weigh Ag powder and Te powder according to the molar ratio of 2:1, and weigh 5g in total. After mixing with a medicine spoon for 7 minutes, put the mixed raw materials into a Φ15mm stainless steel mold, and then put the mold into a 769YP-24B manual Carry out pre-compression (holding pressure at 10MPa for 5min) in the powder tablet press (24T), demoulding to obtain compact;

[0043] 2) Take a large and small molybdenum "cup" container with matching size (the large cup can be fastened on the small cup to play a sealing role), fill the compact into the small "cup", and then buckle the large cup "cup";

[0044] 3) Assembling the molybdenum "cup" container filled with the compact in step 2) into the pyrophyllite pressure transmission medium;

[0045] 4) The pyrophyllite assembly obtained in step 3) is placed in the CS-IIID synthetic diamond hy...

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Abstract

The invention discloses an ultrafast synthetic method of a Ag2X block thermoelectric material. The ultrafast synthetic method is characterized in that Ag and an X elementary substance are taken as raw materials, high pressure is applied at the normal temperature after the raw materials are mixed uniformly, the mixed materials react and are densified by one step, and the Ag2X block thermoelectric material is prepared, wherein X is Se or Te. The densities of Ag2Se and Ag2Te blocks prepared by the ultrafast synthetic method are above 97%; the relevant preparation time is short, and a technology is simple; in addition, the problem of element volatilization in high-temperature synthetic processes of selenide and telluride is solved; accurate control on components and a microstructure is realized; the thermoelectric properties of obtained products are superior to those of products prepared by the traditional preparation method; ZTmax of obtained Ag2Se is equal to 0.65@107 DEG; ZTmax of obtained Ag2Te is equal to 0.7@127 DEG; and the ultrafast synthetic method lays a good foundation for large-scale preparation and large-scale application of Ag2Seand Ag2Te thermoelectric materials.

Description

technical field [0001] The invention belongs to the technical field of thermoelectric material preparation, in particular to an Ag 2 Ultrafast Synthetic Method for X Bulk Thermoelectric Materials. Background technique [0002] In the past ten years, energy and environmental issues have gradually become prominent, and the energy crisis and environmental crisis have attracted increasing attention. At present, about 70% of the energy consumed in the world every year is wasted in the form of waste heat. If the waste heat can be effectively recycled, the problem of energy shortage will be greatly alleviated. Thermoelectric materials can directly convert thermal energy into electrical energy. They have the advantages of no transmission parts, small size, no noise, no pollution, and good reliability. They have great application prospects in the recycling of automobile waste heat and industrial waste heat power generation. The conversion efficiency of thermoelectric materials is d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/04C22C5/06H01L35/16H10N10/852
CPCC22C1/0466C22C5/06H10N10/852
Inventor 唐新峰杨东旺付婕妃苏贤礼鄢永高
Owner WUHAN UNIV OF TECH
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