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High-power-factor zinc oxide thermoelectric material and preparation method therefor

A technology of thermoelectric materials and zinc oxide, which is applied in the direction of thermoelectric device junction lead-out materials, thermoelectric device manufacturing/processing, etc., can solve the problem of not significantly reducing thermal conductance, etc., and achieve constant thermal conductance, strong practicability, low cost effect

Active Publication Date: 2016-02-24
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the problems faced by existing zinc oxide thermoelectric materials, the purpose of the present invention is to provide a zinc oxide thermoelectric material with ultra-high electrical conductivity without significantly reducing thermal conductivity and its preparation method

Method used

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Experimental program
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Effect test

Embodiment 1

[0027] The formula of this embodiment is as follows:

[0028] ZnO(98.6wt%), Al 2 o 3 (0.3wt%),MgO(0.5wt%),TiO 2 (0.6wt%)

[0029] Put the above materials together into a nylon tank, use zirconia balls or stainless steel balls, and use water as the medium for wet grinding in a planetary ball mill, with a rotation speed of 500rpm, a material-to-ball ratio of 10:1, and ball milling for 8 hours; bake the slurry at 120°C After drying, calcinate at 450°C for 2 hours to obtain composite powder; then add 10% PVA binder, artificially granulate, and then press out a green body with a diameter of 12mm; after molding, deglue, in a mixed atmosphere composed of nitrogen and carbon monoxide Under the protection of the environment, the ceramic green body was raised from room temperature to 1200 °C at a rate of 3 °C / min, kept for 2 hours and then cooled with the furnace to obtain a dense ZnO ceramic material.

[0030] After testing, the Oxford energy spectrum test shows that ZnO with high ...

Embodiment 2

[0032] The formula of this embodiment is as follows:

[0033] ZnO(99.7wt%), Al 2 o 3 (0.1wt%),MgO(0.1wt%),TiO 2 (0.1wt%)

[0034] Put the above materials together into a nylon tank, use zirconia balls or stainless steel balls, and use water as the medium for wet grinding in a planetary ball mill, with a rotation speed of 500rpm, a material-to-ball ratio of 10:1, and ball milling for 8 hours; bake the slurry at 120°C After drying, calcinate at 450°C for 2 hours to obtain composite powder; then add 10% PVA binder, artificially granulate, and then press out a green body with a diameter of 12mm; after molding, deglue, in a mixed atmosphere composed of nitrogen and carbon monoxide Under the protection of the environment, the ceramic green body was raised from room temperature to 1200 °C at a rate of 3 °C / min, kept for 2 hours and then cooled with the furnace to obtain a dense ZnO ceramic material.

[0035] ZnO with high Al solid solubility (0.7at%) can be obtained, and the carr...

Embodiment 3

[0037] The formula of this embodiment is as follows:

[0038] ZnO(97.2wt%),Al 2 o 3 (1wt%),MgO(0.8wt%),TiO 2 (1wt%)

[0039] Put the above materials together into a nylon tank, use zirconia balls or stainless steel balls, and use water as the medium for wet grinding in a planetary ball mill, with a rotation speed of 500rpm, a material-to-ball ratio of 10:1, and ball milling for 8 hours; bake the slurry at 120°C After drying, calcinate at 450°C for 2 hours to obtain a composite powder; then add 10% PVA binder, artificially granulate, and then press out a green body with a diameter of 12mm; after molding, deglue, in a mixed atmosphere composed of nitrogen and carbon monoxide Under the protection of the environment, the ceramic green body was raised from room temperature to 1200 °C at a rate of 3 °C / min, kept for 2 hours and then cooled with the furnace to obtain a dense ZnO ceramic material.

[0040] ZnO with high Al solid solubility (2at%) can be obtained, and the carrier c...

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Abstract

The invention relates to a high-power-factor zinc oxide thermoelectric material and a preparation method therefor. The high-power-factor zinc oxide thermoelectric material comprises zinc oxide and an additive, wherein the content of zinc oxide is 97.2-99.7 wt%, and the content of the additive is 0.3-2.8 wt%; and the additive comprises 0.1-1wt% of Al2O3, 0.1-0.8wt% of MgO and 0.1-1wt% of TiO2. According to the zinc oxide thermoelectric material, the doping concentration of the donor Al can be effectively improved; and the solid solubility of the Al in ZnO is from a range below an energy spectrum detection line to 2 at%, so that the conductivity of the material is greatly improved consequently and the thermal conductance is basically kept the same.

Description

technical field [0001] The invention relates to a zinc oxide (ZnO) thermoelectric material with high power factor and a preparation method thereof, belonging to the field of new energy materials. Background technique [0002] With the development of modern human industry, energy and the environment have become important issues for the sustainable development of human beings. As a functional material capable of direct thermoelectric conversion, thermoelectric materials are widely used in low-temperature refrigeration, automobile exhaust power generation, and industrial waste heat recovery and utilization. The performance of thermoelectric materials is generally determined by the thermoelectric figure of merit ZT=S 2 σT / k means, where S, σ, T and k are Seebeck coefficient, electrical conductivity, absolute temperature and thermal conductivity, respectively. A good thermoelectric material should have a high ZT value, which means the material should have a high Seebeck coeffic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L35/22H01L35/34H10N10/855H10N10/01
CPCH10N10/855H10N10/01
Inventor 李国荣田甜刑娟娟郑嘹赢程丽红程健阮学政曾华荣
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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