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Method for efficiently preparing pure CoSb3-based medium-temperature thermoelectric material

A technology of thermoelectric materials and electric materials, which is applied in the field of efficient preparation of pure CoSb3-based medium-temperature thermoelectric materials, can solve the problems of environmental pollution and unpredictable preparation results, and achieves the effects of simple process, low cost and good application prospect.

Inactive Publication Date: 2018-11-06
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

[0009] Aiming at the unpredictable preparation results and the defects of environmental pollution in the existing CoSb3-based skutterudite thermoelectric material preparation methods, the present invention proposes a method for efficiently preparing pure CoSb3-based medium-temperature thermoelectric materials, and uses the method to prepare CoSb3-based medium-temperature thermoelectric materials can predict the preparation results, and there is no pollutant emission during the preparation process, which is a green and environmentally friendly preparation method

Method used

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  • Method for efficiently preparing pure CoSb3-based medium-temperature thermoelectric material

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[0035] A method for efficiently preparing a pure CoSb3-based medium-temperature thermoelectric material. The CoSb3-based medium-temperature thermoelectric material refers to a CoSb3-based material that can be filled or doped with other elements to form a dimensionless thermoelectric with a high figure of merit A medium-temperature thermoelectric material, the preparation method comprising the steps of:

[0036] Step 1: According to the phase diagram of the Co-Sb alloy, select the appropriate ingredients for batching.

[0037] It can be seen from the phase diagram of Co-Sb alloy that there are two peritectic reactions and one eutectic reaction in Co-Sb alloy. When the alloy composition is in the range of 86.1-92.7wt% Sb, 92.7-94.9wt% Sb and 94.9-99.6wt% Sb, two peritectic reactions CoSb+L→CoSb2(936 ℃), CoSb2+L→CoSb3 (874℃), a peritectic reaction CoSb2+L→CoSb3 (874℃), and a eutectic reaction L→CoSb3+Sb (630℃). Therefore, different results can be obtained by choosing different ...

Embodiment 1

[0042] Embodiment 1: select the alloy composition Co-87.9wt%Sb with Sb content between 86.1-92.7wt%, by figure 1 It can be seen from the phase diagram of Co-Sb alloy that under this composition, the as-cast structure of the alloy will consist of CoSb, CoSb2, CoSb3 and Sb. Composition of as-cast microstructure under light microscope ( figure 2 ) are consistent with the results obtained by phase diagram analysis.

[0043] The specific preparation is as follows:

[0044] First, mix Co and Sb evenly according to the selected alloy composition. Considering that the melting points of Co and Sb are quite different, 2% more Sb is added during the configuration process to compensate for the volatilization of Sb. Then melt the uniformly mixed components in a high vacuum directional solidification furnace to reach the required temperature (determine the temperature according to the Co-Sb alloy phase diagram) and keep it warm for 30 minutes and then cool to obtain an ingot. In order to...

Embodiment 2

[0047] Embodiment 2: select the alloy composition Co-93wt%Sb with Sb content between 92.7-94.9wt%, by figure 1 It can be seen from the phase diagram of Co-Sb alloy that under this composition, the as-cast structure of the alloy will consist of CoSb2, CoSb3 and Sb. Composition of as-cast microstructure under light microscope ( Figure 4 ) are consistent with the results obtained by phase diagram analysis.

[0048] The specific preparation process is roughly the same as in Example 1, except that the holding temperature is 1050°C, and in the last step, according to Figure 5 According to the longitudinal section structure diagram, it can be found that according to the TGZM effect, the longitudinal section structure of the mushy zone is composed of L+CoSb2 phase and L+CoSb3 phase, and there is a clear boundary between the two phases. Finally, the corresponding CoSb3 tissue can be intercepted as needed.

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Abstract

The invention relates to a method for efficiently preparing a pure CoSb3-based medium-temperature thermoelectric material. According to a Co-Sb alloy phase diagram, samples with what kind of tissue can be obtained in different component proportions can be known clearly, then by means of a TGZM effect, reverse reaction of alloy preparation is carried out to obtain a mushy zone, and along with extension of holding time, tissues in the mushy zone become purer and more compact. From the Co-Sb alloy phase diagram, the fact that the CoSb3-based thermoelectric material can be obtained in three different component ranges is known, the result is known fairly well during sample preparation. When the CoSb3-based thermoelectric material is prepared through the method, not only can the sample components be foreseen and known fairly well before preparation, but also the preparation efficiency is high, no pollution or harmful substances are generated in the preparation process, and the obtained CoSb3-based thermoelectric material is pure and compact; moreover, the preparation method is simple in process, convenient to operate and lower in cost and has very good application prospects.

Description

technical field [0001] The invention belongs to the technical field of thermoelectric material preparation, and in particular relates to a method for efficiently preparing a pure CoSb3-based medium-temperature thermoelectric material. Background technique [0002] As we all know, with the rapid development of industry, the world is currently facing three major crises: resource shortage, environmental pollution and ecological destruction. At present, our country is in a period of rapid economic development, and is also threatened by the three major crises. To alleviate this urgent situation, the development of new energy materials has become an urgent need. Thermoelectric materials, as a new type of environmentally friendly and green energy materials that can directly convert electrical energy and thermal energy, have attracted widespread attention from scientists from all over the world, and may become an important part of the solution to the world's energy crisis (Science ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C12/00C22C1/02C22F1/16H01L35/18H01L35/34H10N10/01H10N10/853
CPCC22C1/02C22C12/00C22F1/002C22F1/16H10N10/853H10N10/01
Inventor 李旭光李双明王洪强钟宏李晓历
Owner NORTHWESTERN POLYTECHNICAL UNIV
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