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Massive thermoelectric material preparation method

A technology of thermoelectric materials and blocks, which is applied in the field of preparation of block thermoelectric materials, can solve the problems of unfavorable promotion and application of thermoelectric batteries, high equipment costs, and increased costs, and achieve good industrial application prospects, low preparation costs, and increased conductivity sexual effect

Inactive Publication Date: 2013-09-11
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Using the above three methods, special equipment is required, the equipment cost is high, the investment is large, and the energy consumption is high, and the output is small, which greatly increases the cost of the product, which is not conducive to the promotion and application of thermoelectric batteries.

Method used

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  • Massive thermoelectric material preparation method
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  • Massive thermoelectric material preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] will Bi 2 Te 3 Thermoelectric material powder (A), conductive silver paste (B) and ethanol (C) are weighed according to the mass ratio of A:B:C=1:0.5:1, mixed and stirred evenly; Ultrasonic vibration is carried out in the device; the raw material after ultrasonic vibration is rolled into a sheet with a thickness of 5 mm in a rolling device, such as figure 1 shown. Put the sheet material into a drying box, dry and cure it at 120°C for 45 minutes; cut the dried and cured sheet material to obtain a bulk thermoelectric material, such as figure 2 shown. The Seebeck coefficient of the prepared bulk thermoelectric material is -170 μV / K and the conductivity is 1.8×10 5 Ω -1 m -1 .

Embodiment 2

[0028] Mg 2 Si thermoelectric material powder (A), conductive carbon slurry (B), methanol (C) are weighed according to the mass ratio of A:B:C=1:0.25:0.5, mixed and stirred evenly; Ultrasonic vibration is carried out in a vibration device; the raw materials after ultrasonic vibration are rolled into sheets with a thickness of 1 mm in a tablet press, see image 3 ; Put the sheet material into the drying box, dry and solidify it at 150°C for 25 minutes; cut the dried and solidified sheet material to obtain the bulk thermoelectric material, see Figure 4 . The Seebeck coefficient of the prepared bulk thermoelectric material is -550 μV / K and the conductivity is 1.1×10 3 Ω -1 m -1 .

Embodiment 3

[0030] Will Ca 3 Co 4 O 9 Thermoelectric material powder (A), conductive aluminum paste (B) and acetone (C) are weighed according to the mass ratio A:B:C=1:0.2:0.8, mixed and stirred evenly; Ultrasonic vibration is carried out in the device; the raw material after ultrasonic vibration is rolled into a sheet with a thickness of 4 mm in a rolling device; the sheet-shaped raw material is placed in a drying box, and dried and cured at 300 ° C for 2 minutes; the drying The cured sheet material is cut to obtain a bulk thermoelectric material. The Seebeck coefficient of the prepared bulk thermoelectric material is 162 μV / K and the conductivity is 7.8×10 3 Ω -1 m -1 .

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Abstract

The invention discloses a massive thermoelectric material preparation method. The method includes the steps: firstly, weighing thermoelectric material powder, a conductive binding agent and a dispersing agent according to a mass ratio of 1:0.1-0.5: 0-1, mixing and stirring uniformly; secondly, performing ultrasonic tamping vibration on the uniformly stirred raw materials in an ultrasonic vibration device; thirdly, rolling the raw materials subjected to ultrasonic tamping vibration in a rolling device to flaky materials in the thickness of 1-5mm; fourthly, drying and curing the flaky materials for 2-60 minutes at the temperature of 80-300 DEG C; and fifthly, cutting dried and cured flaky materials to obtain massive thermoelectric materials. The thermoelectric material powder is prepared into a certain shape by curing of the conductive binding agent and has certain strength and excellent conductivity, and the method has the advantages of simplicity, efficiency and low cost.

Description

technical field [0001] The invention belongs to the technical field of thermoelectric material preparation, and in particular relates to a preparation method of bulk thermoelectric material. Background technique [0002] With the development of industrialization, a large amount of fossil raw materials such as coal and petroleum are used for power generation and heating, which has caused global energy and environmental problems, and these problems are becoming more and more serious. Thermal energy and electric energy are the most important forms of energy in real life, and electric energy is the most convenient and most transmitted and used form of energy. According to relevant data, only about 35% of the existing heat energy has been utilized, and most of the heat energy is discharged in the form of waste heat, which has not been well utilized. Thermoelectric materials are functional materials that can directly convert heat and electricity into each other. Thermoelectric ...

Claims

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Application Information

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IPC IPC(8): H01L35/34
Inventor 袁海滨易伟欣
Owner HENAN POLYTECHNIC UNIV