Thermoelectric material and manufacturing method thereof

A technology of thermoelectric materials and raw materials, applied in the field of materials engineering, can solve the problems of few types of thermoelectric materials and limited thermoelectric materials, etc.

Inactive Publication Date: 2014-08-13
XIHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, in the related art, there are few types of thermoelectric materials, especially thermoelectric materials with a higher ZT value (requiring thermoelectric materials to have higher electrical conductivity and lower thermal conductivity) are extremely limited; therefore, providing a kind of Thermoelectric materials with higher ZT values ​​are a technical problem to be solved urgently in this field

Method used

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  • Thermoelectric material and manufacturing method thereof
  • Thermoelectric material and manufacturing method thereof

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preparation example Construction

[0038] In addition, in the present invention, the preparation method of the thermoelectric material includes the following steps:

[0039] Step 101: Determine the weight of raw materials required for each component according to the chemical formula of the thermoelectric material, and then weigh the raw materials with a predetermined weight under the protection of argon;

[0040] More specifically, in this step, the raw material is a simple substance or an intermediate alloy composed of two or more corresponding elements, and the process of weighing the raw material can be carried out in a glove box, and the water content in the glove box is <0.1ppm. Oxygen content <0.1ppm.

[0041] Under the protection of argon, various raw materials can be prevented from being oxidized, thereby making the performance of each raw material stable, and avoiding the decline of thermoelectric performance parameters after being oxidized.

[0042] Step 102: mixing the weighed raw materials and ball...

Embodiment 1

[0050] A kind of thermoelectric material is provided in the embodiment of the present invention, and its chemical formula is: Ge 0.94 Pb 0.01 Bi 0.05 Te.

[0051] Its preparation method is: using Ge, Te, Pb and Bi simple substances as raw materials, according to the chemical molecular formula Ge 0.94 Pb 0.01 Bi 0.05 Te was weighed and proportioned in the glove box. Among them, the water content of the glove box is less than 0.1ppm, and the oxygen content is less than 0.1ppm; put the weighed raw materials together with the balls into the ball mill tank, and use a 3-dimensional high-performance ball mill to prepare fine mixed powder under the protection of Ar. The ratio is 2:1, the speed of the ball mill is 1500 rpm, and the ball milling time is 8-10 hours; the powder obtained by the ball mill is subjected to direct current rapid hot-pressing sintering in a vacuum environment, and the vacuum degree is 1×10 -2 Pa, pressure 30-60MPa, sintering temperature 500°C, holding time...

Embodiment 2

[0054] A kind of thermoelectric material is provided in the embodiment of the present invention, and its chemical formula is: Ge 0.92 Pb 0.03 Bi 0.05 Te.

[0055] Its preparation method includes: using Ge, Te, Pb and Bi simple substances as raw materials, according to the chemical molecular formula Ge 0.92 Pb 0.03 Bi 0.05 Te is weighed and proportioned in the glove box, wherein the water content of the glove box is -2 Pa, pressure 30-60MPa, sintering temperature 500°C, holding time 2 minutes, GeTe-based thermoelectric material Ge 0.92 Pb 0.03 Bi 0.05 Te.

[0056] The thermoelectric material Ge that present embodiment makes 0.92 Pb 0.03 Bi 0.05 The phase and thermoelectric properties of Te are as follows: Figure 2-6 As shown, its thermal conductivity is 1.282W / m.K at 673K, which is 47% of 2.741W / m.K at the same temperature of pure GeTe; and its maximum figure of merit (ZT) is 1.78, which is 73% higher than 1.03 of pure GeTe .

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Abstract

The invention relates to the technical field of material engineering, in particular to a thermoelectric material and a manufacturing method of the thermoelectric material. The chemical formula of the thermoelectric material is Gel-x-yAxByTel-zCz, wherein the A is Si or Sn or Pb, the B is Sb or Bi, the C is S or Se, the value range of the x is from 0 to 0.2, the value range of the y is from 0 to 0.2, and the value range of the z is from 0 to 0.2. The thermoelectric material has the higher electrical conductivity and the lower thermal conductivity, and the thermoelectricity merit figure can reach 1.78 to 1.986, so that the technical problem that the thermoelectric material with the higher ZT value is deficient in the field is solved, and the thermoelectric material can be used for manufacturing a thermoelectric device.

Description

technical field [0001] The invention relates to the technical field of material engineering, in particular to a thermoelectric material and a preparation method thereof. Background technique [0002] Thermoelectric materials are called thermoelectric materials, which are functional materials that can realize mutual conversion between thermal energy and electrical energy. Thermoelectric materials are one of the very competitive new energy materials and have broad application prospects. Therefore, thermoelectric materials can be well used to make thermoelectric devices. [0003] Thermoelectric devices made of thermoelectric materials have the advantages of small size, light weight, no mechanical moving parts, no noise during operation, long service life, safety and reliability. [0004] However, the conversion efficiency of thermoelectric devices is mainly determined by the performance of thermoelectric materials, and the performance of thermoelectric materials is expressed b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L35/16H01L35/34C01B19/00
Inventor 张勤勇杨建宁雷晓波闵中华
Owner XIHUA UNIV
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