Alkaline-earth-silicide thermoelectric material and preparation method therefor

A technology of thermoelectric materials and silicides, which is applied in the direction of metal silicides, can solve the problems of preparation that are rarely reported and cannot solve the problems of strong corrosive preparation of alkaline earth metals, and achieve the problem of difficult preparations, good industrialization prospects, high plug The effect of the Erbeck coefficient

Inactive Publication Date: 2015-11-11
TONGJI UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

The technical solutions published in the above patents are mainly aimed at Mn and Fe elements, which still cannot solve the preparation problems caused by the strong corrosion and high vapor pressure of alkaline earth metals themselves, and need to be further improved
The current research on alkaline earth silicides mainly uses plasma beam spraying technology to prepare BaSi 2 thin film materials, however, there are few reports on the preparation of alkaline earth silicide bulk materials

Method used

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  • Alkaline-earth-silicide thermoelectric material and preparation method therefor
  • Alkaline-earth-silicide thermoelectric material and preparation method therefor
  • Alkaline-earth-silicide thermoelectric material and preparation method therefor

Examples

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Effect test

Embodiment 1

[0040] Mix the high-purity raw materials Ba and Si according to the molar ratio of 1:2, mix them evenly, put them into the copper bowl in the chamber of the arc equipment and wait for melting, close the melting chamber to vacuumize, and fill it with argon to 0.7 atmospheric pressure, so that the raw materials The melting reaction was carried out under the protection of argon. Cool the copper bowl containing the raw materials with water, adjust the distance between the tungsten electrode and the raw material, adjust the arcing current to 40A and energize it, so that the tungsten electrode and the raw material are discharged and arced, and the metal raw material undergoes sufficient chemical reaction in the molten state. The sample is cooled rapidly through a water-cooled copper bowl, and then the sample is turned over to repeat the above melting process to further homogenize the composition of the material to obtain a block. The block was vacuum-packed in a quartz tube and heat...

Embodiment 2

[0045] The general chemical formula of the alkaline earth silicide thermoelectric material in this example is SrSi 2 , the preparation method comprises the following steps:

[0046] (1) Charging: the metal elemental Sr with a purity > 99% and the elemental silicon Si are pressed according to the chemical formula SrSi 2 The stoichiometric ratio ingredients are mixed evenly to make mixed raw materials, and placed in the copper bowl in the melting chamber of the arc equipment to wait for melting;

[0047] (2) Arc discharge melting: evacuate the melting chamber of the arc equipment, and introduce inert gas, adjust the air pressure in the melting chamber of the arc equipment to 0.6 atmospheres, adjust the arc starting current to 55A, and electrify to discharge the electrodes and the mixed raw materials Arcing, the mixed raw materials undergo full chemical reaction in the molten state;

[0048] (3) Water cooling: After the chemical reaction in step (2) ends, the water cooling devi...

Embodiment 3

[0056] The general chemical formula of the alkaline earth silicide thermoelectric material in this example is SrSi 2 , the preparation method comprises the following steps:

[0057] (1) Charging: the metal elemental Sr with a purity > 99% and the elemental silicon Si are pressed according to the chemical formula SrSi 2 The stoichiometric ratio ingredients are mixed evenly to make mixed raw materials, and placed in the copper bowl in the melting chamber of the arc equipment to wait for melting;

[0058] (2) Arc discharge melting: evacuate the melting chamber of the arc equipment, and introduce inert gas, adjust the air pressure in the melting chamber of the arc equipment to 0.8 atmospheres, adjust the arc starting current to 9A, and electrify to discharge the electrodes and the mixed raw materials Arcing, the mixed raw materials undergo full chemical reaction in the molten state;

[0059] (3) Water cooling: After the chemical reaction in step (2) ends, the water cooling devic...

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Abstract

The invention relates to an alkaline-earth-silicide thermoelectric material and a preparation method therefor. The chemical general formula of the thermoelectric material is ASi2, wherein A is either Sr or Ba. The preparation method comprises the steps of adopting a metal element with purity higher than 99% as a raw material, proportioning materials according to the stoichiometric ratio of the chemical formula ASi2, then, carrying out arc-discharge melting and water cooling so as to prepare a ASi2 block material, and then, carrying out heat treatment, grinding and sintering, thereby preparing the alkaline-earth-silicide thermoelectric material. Compared with the prior art, the alkaline-earth-silicide thermoelectric material and the preparation method therefor have the advantages that by applying an arc melting technology to the field of preparation of the alkaline-earth-silicide thermoelectric material, the problem of difficulty of preparation resulting from high melting point of alkaline-earth silicide is solved, meanwhile, the problem of safety of preparation caused by the high vapor pressure and high corrosiveness of alkali metal elements is solved, the process is simple, the preparation cycle is short, the safety is high, and the prospect for industrialization is good.

Description

technical field [0001] The invention belongs to the technical field of new energy materials, and relates to an alkaline earth silicide thermoelectric material and a preparation method thereof, in particular to one. Background technique [0002] Thermoelectric power generation technology is a technology that directly converts thermal energy into electrical energy by using the Seebeck effect of semiconductor materials. It has the advantages of no transmission parts, high reliability, long life, and environmental friendliness. It is used in waste heat power generation, space science, and military equipment. , household appliances and many other fields play an important role. Its conversion efficiency mainly depends on the dimensionless thermoelectric performance performance index ZT of the material itself (ZT=S 2 σT / κ, where S is the Seebeck coefficient; σ is the electrical conductivity; κ is the thermal conductivity, and T is the absolute temperature). The higher the ZT valu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/06
Inventor 裴艳中李文
Owner TONGJI UNIV
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