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Solid-phase reaction preparation method for silicious manganese thermoelectric material

A technology of solid phase reaction and thermoelectric materials, applied in the manufacture/processing of thermoelectric devices, etc., can solve the problems that limit the practical application of high manganese silicon thermoelectric materials, and achieve the effect of low price, low requirements for equipment and low cost

Inactive Publication Date: 2012-12-19
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These all greatly limit the possible practical application of high manganese silicon thermoelectric materials in the future

Method used

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  • Solid-phase reaction preparation method for silicious manganese thermoelectric material
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  • Solid-phase reaction preparation method for silicious manganese thermoelectric material

Examples

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Embodiment 1

[0031] A solid phase reaction preparation method for high manganese silicon thermoelectric material, it comprises the following steps:

[0032] 1) Using Mn powder and Si powder as raw materials, according to MnSi 1.80 Stoichiometric proportioning (i.e. weigh Si powder and Mn powder according to the molar ratio of Si powder and Mn powder is 1.80:1), weigh the total amount to 2.5g, and mix the raw material powders by hand in a mortar to obtain a mixed uniform powder;

[0033] 2) Press the uniformly mixed powder into a block on a tablet press (the block is a cylindrical block with a diameter of 15mm, and the pressure of the tablet press is 20-30MPa), and place the block in a quartz glass tube (inner diameter 17mm, outer diameter 20mm), vacuumize and seal, then place in a muffle furnace for solid phase reaction at 900°C for 12h (during the solid phase reaction, the temperature is raised from 300°C to 900°C at a heating rate of 10°C / min , and then kept at 900°C for 12h), and cool...

Embodiment 2

[0039] A solid phase reaction preparation method for high manganese silicon thermoelectric material, it comprises the following steps:

[0040] 1) Using Mn powder, Si powder and Ge powder as raw materials, according to Mn(Ge 0.016 Si 0.984 ) 1.80 Stoichiometric ratio ingredients (Si is missing during the reaction process, if the nominal ratio is MnSi 1.80 , the actual ratio obtained is MnSi 1.75 . Here Ge replaces the Si position, the sum of the molar weights of Ge and Si is 1), the total weight is 2.5g, and the raw material powder is manually mixed in a mortar to obtain a uniformly mixed powder;

[0041]2) Press the uniformly mixed powder into a block on a tablet press (the block is a cylindrical block with a diameter of 15mm, and the pressure of the tablet press is 20-30MPa), and place the block in a quartz glass tube (inner diameter 17mm, outer diameter 20mm), vacuumize and seal, then place in a muffle furnace for solid phase reaction at 900°C for 12h (during the solid...

Embodiment 3

[0047] A solid phase reaction preparation method for high manganese silicon thermoelectric material, it comprises the following steps:

[0048] 1) Using Mn powder and Si powder as raw materials, according to MnSi 1.75 Stoichiometric proportioning (i.e. weighing Si powder and Mn powder according to the molar ratio of Si powder and Mn powder is 1.75:1), weighing a total of 2.5g, mixing the raw material powders by hand in a mortar to obtain a mixed uniform powder;

[0049] 2) Press the uniformly mixed powder into a block on a tablet press (the block is a cylindrical block with a diameter of 15mm, and the pressure of the tablet press is 20-30MPa), and place the block in a quartz glass tube (inner diameter 17mm, outer diameter 20mm), vacuumize and seal, then place in a muffle furnace for solid phase reaction at 900°C for 12h (during the solid phase reaction, the temperature is raised from 300°C to 900°C at a heating rate of 10°C / min , and then kept at 900°C for 12h), and cooled w...

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Abstract

The invention belongs to the technical field of new energy materials, and particularly relates to a preparation method for a silicious manganese thermoelectric material. A solid-phase reaction preparation method for the silicious manganese thermoelectric material is characterized by comprising the steps as follows: (1) Si powder and Mn powder are taken as raw materials, weighed according to the molar ratio of (1.75-1.80):1, and mixed evenly to obtain evenly mixed powder; (2) the evenly mixed powder are put on a tabletting machine and pressed into a bulk, the bulk is placed into a quartz glasstube, the quartz glass tube is vacuumized and sealed and then is placed in a muffle furnace for 850-900 DEG C solid-phase reaction for 12-24 hours, and the product is obtained after heat preservationis finished and furnace cooling is carried out; (3) the product obtained in step (2) is ground into fine powder; and (4) the fine powder obtained in step (3) is subjected to electric discharge plasmasintering, and the compact silicious manganese thermoelectric material can be obtained. The method has the advantages of simple process, low cost, energy conservation, and low requirements for instruments and equipment, and is suitable for commercial manufacture.

Description

technical field [0001] The invention belongs to the technical field of new energy materials, and in particular relates to a preparation method of a high manganese silicon thermoelectric material. Background technique [0002] Energy is the basis for human survival and development. However, with the reduction of non-renewable energy such as fossil energy and the increase of global energy demand, the energy crisis may become a major crisis in the 21st century. Finding and developing new energy materials has become a research hotspot for scientists around the world. In real life, there is a lot of wasted heat energy, such as exhaust heat from automobiles, exhaust heat from factory waste water, etc. Using thermoelectric materials, we can harness this thermal energy and turn it into a reusable source of energy. Therefore, thermoelectric materials, as a new energy material that utilizes the movement of carriers inside the material to achieve direct conversion of thermal energy ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/05H01L35/34H10N10/01
Inventor 唐新峰姚凤霞罗文辉林泽冰
Owner WUHAN UNIV OF TECH
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