Preparation method of copper-based oxide thermoelectric material

A thermoelectric material and oxide technology, applied in the field of preparation of copper-based oxide thermoelectric materials, can solve the problems of inability to retain micro/nano structure and size, low thermal stability of copper-based oxide, and inability to suppress grain growth, etc. , to achieve the effects of excellent thermal stability and oxidation resistance, reduced lattice thermal conductivity, and short sintering time

Pending Publication Date: 2022-06-17
BEIHANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The preparation methods for copper-based oxides include atmospheric pressure sintering and hot-pressing sintering. The traditional sintering process is long, unable to inhibit the growth of grains, unable to retain the micro / nano structure and size introduced by mechanical alloying, low efficiency and waste of energy And the operation is complex, and the prepared copper-based oxide has low thermal stability and poor oxidation resistance

Method used

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  • Preparation method of copper-based oxide thermoelectric material
  • Preparation method of copper-based oxide thermoelectric material
  • Preparation method of copper-based oxide thermoelectric material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A preparation method of a copper-based oxide thermoelectric material, comprising:

[0028] Step 1. Use high-purity La 2 O 3 and CuO oxide as the initial raw material, according to La 2 O 3 : CuO=1:1 ratio ingredients, mixed into powder;

[0029] Step 2. Put the mixed powder into the ball mill tank, and perform ball milling in an atmosphere of inert gas (argon), the rotating speed is 100rpm, and the time is 15min; after the dry grinding, the air inlet of the ball mill tank is fed with argon. , inject absolute ethanol into the air outlet as a medium for wet grinding, the rotational speed of the wet grinding is 50rpm, and the time is 15min to obtain a mixture;

[0030] During the dry grinding operation, the mutual grinding effect between the powder particles is large, which is conducive to the rounding of the particle shape, and its compact density is also higher. During the wet grinding process, anhydrous ethanol is added to limit the agglomeration of the powder and p...

Embodiment 2

[0037] A preparation method of a copper-based oxide thermoelectric material, comprising:

[0038] Step 1. Use high-purity La 2 O 3 and CuO oxide as the initial raw material, according to La 2 O 3 : CuO=1:1 ratio ingredients, mixed into powder;

[0039] Step 2, put the mixed powder into the ball mill tank, and perform ball milling in an atmosphere of inert gas (argon), the rotating speed is 500rpm, and the time is 96h; after the dry grinding, the air inlet of the ball mill tank is fed with argon while , inject absolute ethanol into the air outlet as a medium for wet grinding, the rotational speed of the wet grinding is 300rpm, and the time is 12h to obtain a mixture;

[0040]Step 3, drying the mixture in the second step, the drying temperature is 200°C, and the time is 20h, finally obtaining La 2 O 3 Fully mixed nanopowder with CuO;

[0041] Step 4. Put the nano powder into a mold with a diameter of 12.5mm, press it into a cylindrical sheet with a diameter of 12.5mm and ...

Embodiment 3

[0046] A preparation method of a copper-based oxide thermoelectric material, comprising:

[0047] Step 1. Use high-purity La 2 O 3 and CuO oxide as the initial raw material, according to La 2 O 3 : CuO=1:1 ratio ingredients, mixed into powder;

[0048] Step 2, put the mixed powder into the ball mill tank, and perform ball milling in an atmosphere of inert gas (argon), the rotating speed is 300rpm, and the time is 300min; after the dry grinding, the air inlet of the ball mill tank is fed with argon while , inject absolute ethanol into the air outlet as a medium for wet grinding, the rotational speed of the wet grinding is 300rpm, and the time is 300min to obtain a mixture;

[0049] Step 3, drying the mixture in the second step, the drying temperature is 50°C, and the time is 10h, finally obtaining La 2 O 3 Fully mixed nanopowder with CuO;

[0050] Step 4. Put the nano powder into a mold with a diameter of 12.5mm, press it into a cylindrical sheet with a diameter of 12.5m...

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Abstract

The invention discloses a preparation method of a copper-based oxide thermoelectric material. The preparation method comprises the following steps: mixing lanthanum oxide La2O3 and copper oxide CuO, and sequentially carrying out dry grinding and wet grinding in a ball-milling tank; drying the mixture subjected to dry grinding and wet grinding to obtain nano powder, placing the nano powder in a mold, pressing the nano powder into a sheet sample by an electric powder tablet press, and placing the sheet sample in a crucible with 99% of aluminum oxide; the crucible is put into a resistance furnace to be heated and subjected to heat preservation, and then the crucible is cooled to the room temperature along with the resistance furnace; taking out the flaky sample in the crucible, grinding and sieving to obtain nano powder of the copper-based oxide; the nano powder of the copper-based oxide is placed in a graphite mold, the graphite mold is placed in a discharge plasma sintering furnace to be sintered, and the blocky copper-based oxide La2CuO4 is obtained.The copper-based oxide which is low in raw material cost, high in heat stability, high in oxidation resistance and free of pollution to the environment is prepared.

Description

technical field [0001] The invention relates to the technical field of thermoelectric materials, in particular to a preparation method of a copper-based oxide thermoelectric material. Background technique [0002] With the increasingly serious energy problem in recent years, waste heat recovery has become one of the effective ways to alleviate the problem of energy shortage. Among them, thermoelectric materials have attracted extensive attention because they can realize the mutual conversion of thermal energy and electric energy without mechanical structure. At present, most refrigeration and low temperature temperature difference conversion components are mostly heavy metal alloys, such as Bi 2 Te 3 , Bi 2 Se 3 etc. Although they have good thermoelectric performance figures of merit, their raw materials are expensive, unstable at high temperature and easy to be oxidized, and all have great toxicity. In order to better meet the market demand, to develop a high-temperatur...

Claims

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Application Information

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IPC IPC(8): C04B35/45C04B35/50C04B35/622
CPCC04B35/4504C04B35/622C04B2235/3227C04B2235/666C04B2235/6562C04B2235/6567C04B2235/6581
Inventor 赵立东刘姗张潇洪涛
Owner BEIHANG UNIV
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