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An ultra-fast method for preparing high-performance high-manganese-silicon thermoelectric materials

A thermoelectric material, high manganese silicon technology, applied in the direction of thermoelectric device junction lead wire material, metal silicide, etc., can solve the problems of high equipment requirements, impurities, difficult to scale application, etc., to achieve low equipment requirements, repeatability Good, shortened cycle effect

Active Publication Date: 2016-08-17
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the melting process, due to the slow diffusion rate of Si atoms, it is difficult to complete the peritectic reaction between the previously formed MnSi phase and the Si melt, and it is difficult to obtain a single-phase high manganese silicon compound
The mechanical alloying method is another widely used method, but due to the long preparation cycle, high requirements on equipment, and easy introduction of impurities, it is difficult to apply on a large scale

Method used

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  • An ultra-fast method for preparing high-performance high-manganese-silicon thermoelectric materials
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  • An ultra-fast method for preparing high-performance high-manganese-silicon thermoelectric materials

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Experimental program
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Effect test

Embodiment 1

[0030] A new method for ultra-fast preparation of high-performance high-manganese-silicon thermoelectric materials, which includes the following steps:

[0031] 1) Press MnSi 1.75 The stoichiometric ratio of each atom is weighed Mn powder, Si powder, total mass 2.5g, then they are ground and mixed evenly, and the uniformly mixed powder is pressed into a cylindrical block block with a diameter of 15mm (40MPa holding pressure for 15min) ;

[0032] 2) Enclose the block obtained in step 1) into a vacuum quartz glass tube, and put it into a vertical furnace with an overall temperature of 1180°C for thermal explosion reaction (TE, Thermal Explosion), take it out after 10 minutes and let it cool naturally;

[0033] 3) Grinding the above-mentioned product into powder, performing discharge plasma activated sintering (PAS, Plasma ActivatedSintering), putting the powder into a graphite mold with a diameter of 15mm for compaction, and then sintering under the conditions of a vacuum of le...

Embodiment 2

[0036] A new method for ultra-fast preparation of high-performance high-manganese-silicon thermoelectric materials, which includes the following steps:

[0037] 1) Press MnSi 1.75 The stoichiometric ratio of each atom is weighed Mn powder, Si powder, total mass 2.5g, then they are ground and mixed evenly, and the uniformly mixed powder is pressed into a cylindrical block block with a diameter of 15mm (40MPa holding pressure for 15min) ;

[0038] 2) Seal the block obtained in step 1) into a vacuum quartz glass tube, and put it into a vertical furnace with an overall temperature of 1237°C for thermal explosion reaction (TE, Thermal Explosion), take it out after 5 minutes, and let it cool naturally;

[0039] 3) Grind the above-mentioned product into powder, perform discharge plasma activated sintering (PAS, Plasma ActivatedSintering), put the powder into a graphite mold with a diameter of 15mm for compaction, and then sinter under the conditions of a vacuum of less than 10Pa and...

Embodiment 3

[0042] A new method for ultra-fast preparation of high-performance high-manganese-silicon thermoelectric materials, which includes the following steps:

[0043] 1) According to Mn(Al 0.0015 Si 0.9985 ) 1.75 The stoichiometric ratio of each atom, that is, the stoichiometric ratio of Mn, Al and Si is 1:(0.0015*1.75):(0.9985*1.75) to weigh Mn powder, Al powder, Si powder, total mass 2.5g, then They are ground and mixed evenly, and the uniformly mixed powder is pressed into a cylindrical block block with a diameter of 15mm (40MPa holding pressure for 15min);

[0044] 2) Seal the block obtained in step 1) into a vacuum quartz glass tube, and put it into a vertical furnace with an overall temperature of 1237°C for thermal explosion reaction (TE, Thermal Explosion). After 10 minutes of reaction, take it out and let it cool naturally;

[0045] 3) Grinding the above-mentioned product into powder, performing discharge plasma activated sintering (PAS, Plasma ActivatedSintering), putti...

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Abstract

The invention specifically relates to an ultra-fast method for preparing high-performance high-manganese silicon thermoelectric materials, which includes the following steps: 1) Weigh Mn powder, M powder, and Si powder according to the stoichiometric ratio of each atom of Mn (MxSi1-x) 1.75 , then grind and mix the raw materials evenly and press them into blocks; the M is Al or Ge, when M is Al, 0 ≤ x ≤ 0.0045; when M is Ge, 0 ≤ x ≤ 0.01; 2) Step 1) The obtained block triggers a thermal explosion synthesis reaction, and after the reaction is completed, it is naturally cooled to obtain a single-phase high-manganese silicon compound; 3) The obtained single-phase high-manganese silicon compound is ground into powder and subjected to discharge plasma activation and sintering to obtain a high-performance high-manganese silicon compound. Manganese silicon thermoelectric materials. The invention has the advantages of fast reaction speed, simple process, high efficiency, energy saving and good repeatability. The entire preparation process can be shortened from more than 12 hours in the traditional method to less than 0.5 hours, and the obtained block has excellent thermoelectric properties.

Description

technical field [0001] The invention belongs to the technical field of preparation of new energy materials, and in particular relates to a method for ultrafast preparation of high-performance high-manganese silicon thermoelectric materials. Background technique [0002] In the international environment where non-renewable fossil energy such as oil, coal, and natural gas is consumed in large quantities and causes energy shortages, the development of green and renewable energy has become the only way for the sustainable and stable development of human society. Thermoelectric conversion technology is a technology that realizes direct mutual conversion between electric energy and thermal energy through the Seebeck effect and Peltier effect of thermoelectric materials. It has the advantages of no transmission parts, small size, no noise, and good reliability. It is used as a Environmentally friendly energy conversion technology has important application prospects in the recovery ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/05C22C1/10C22C22/00C22C32/00C01B33/06H01L35/14H10N10/851
Inventor 唐新峰佘晓羽苏贤礼鄢永高
Owner WUHAN UNIV OF TECH