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Preparation method of high-purity nano-powder Mg2-xSiTMx thermoelectric materials

A nano-powder and thermoelectric material technology, applied in the direction of nanotechnology, sustainable manufacturing/processing, chemical industry, etc., can solve the problems of reducing the ZT value of Si thermoelectric materials, long reaction time, low product purity and uniformity, etc.

Inactive Publication Date: 2012-07-18
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main problems of these technologies are complex preparation process, long reaction time, serious oxidation loss of Mg powder, low product purity and uniformity, which seriously reduces the Mg 2 ZT value of Si thermoelectric material

Method used

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  • Preparation method of high-purity nano-powder Mg2-xSiTMx thermoelectric materials
  • Preparation method of high-purity nano-powder Mg2-xSiTMx thermoelectric materials
  • Preparation method of high-purity nano-powder Mg2-xSiTMx thermoelectric materials

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0014] MgH 2 powder (average particle size 36μm, purity 99.8%), nano-Si powder (average particle size 20nm, purity 99.90%) and YH 2-3 powder (average particle size 35μm, purity 99.8%) with 1.9975mol MgH 2 , 1mol Si and 0.0025mol YH 2 The reaction powder 5 is formed after mixing in proportion, and then the reaction powder 5 is put into a three-necked quartz flask 4, and the mouth of the bottle is sealed. Place the sealed three-necked quartz flask 4 in the microwave oven 1, and connect the two ends with the argon gas bottle 7 and the exhaust pipe inserted into the mineral oil 8 respectively; first open the argon gas inlet valve 2, and then open the exhaust valve at the other end 3. Make continuous air bubbles emerge from the exhaust pipe inserted into the mineral 7, and prevent the air from flowing back into the pipe; start the microwave power supply, and react the powder 5 under the microwave power of 0.5kW for 5 minutes, then turn off the power supply to make the reaction G...

Embodiment approach 2

[0016] MgH 2 powder (average particle size 36μm, purity 99.8%), nano-Si powder (average particle size 20nm, purity 99.90%) and YH 2-3 powder (average particle size 35μm, purity 99.8%) with 1.995mol MgH 2 , 1mol Si and 0.005mol YH 2 The reaction powder 5 is formed after mixing in proportion, and then the reaction powder 5 is put into a three-necked quartz flask 4, and the mouth of the bottle is sealed. Place the sealed three-necked quartz flask 4 in the microwave oven 1, and connect the two ends with the argon gas bottle 7 and the exhaust pipe inserted into the mineral oil 8 respectively; first open the argon gas inlet valve 2, and then open the exhaust valve at the other end 3. Make the exhaust pipe inserted into the mineral 7 have continuous bubbles, and prevent the air from flowing back into the pipe; start the microwave power supply, and the reaction powder 5 reacts under the microwave power of 1kW for 3 minutes, and then turn off the power supply to make the reaction gen...

Embodiment approach 3

[0018] (average particle size 36μm, purity 99.8%), nano Si powder (average particle size 20nm, purity 99.90%) and YH 2-3 powder (average particle size 35μm, purity 99.8%) with 1.99mol MgH 2 , 1mol Si and 0.01mol YH 2 The reaction powder 5 is formed after mixing in proportion, and then the reaction powder 5 is put into a three-necked quartz flask 4, and the mouth of the bottle is sealed. Place the sealed three-necked quartz flask 4 in the microwave oven 1, and connect the two ends with the argon gas bottle 7 and the exhaust pipe inserted into the mineral oil 8 respectively; first open the argon gas inlet valve 2, and then open the exhaust valve at the other end 3. Make the exhaust pipe inserted into the mineral 7 have continuous bubbles, and prevent the air from flowing back into the pipe; start the microwave power supply, and the reaction powder 5 reacts under the microwave power of 1kW for 3 minutes, and then turn off the power supply to make the reaction generate Mg 2-x S...

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Abstract

Disclosed is a preparation method of high-purity nano-powder Mg2-xSiTMx thermoelectric materials, which belongs to the field of thermoelectric material preparation and particularly relates to a technical scheme of preparation method of high-purity nano-powder Mg2-xSiTMx thermoelectric materials through a microwave reaction method. The preparation method is characterized in that magnesium hydride(MgH2) power, silicon powder and transition metal hydride TMHy powder are reacted under the protection of flowing argon air in a microwave oven, a decomposition temperature of the magnesium hydride powder and a decomposition temperature of the TMHy powder are both under 350 DEG C, reactants are easy to be decomposed and distributed in a substrate uniformly during the reaction process, the strong reducibility of the reactants can inhibit a substrate surface from absorbing oxygen and avoid further forming of oxidation products, and high-purity nano-powder Mg2-xSiTMx powder with a purity of not less than 99.95% is obtained. According to method, the process is simple, efficiency is high, energy is saved, and the prepared Mg2-xSiTMx thermoelectric materials have good thermoelectric performance.

Description

technical field [0001] High-purity nano-powder Mg of the present invention 2-x SiTM x The preparation method of thermoelectric material belongs to the field of thermoelectric material preparation, specifically a method for preparing high-purity nano-powder Mg 2-x SiTM x Technical scheme of the method for thermoelectric materials. Background technique [0002] Relative to Bi 2 Te 3 , PbTe and SiGe alloy system thermoelectric materials, Mg 2 The performance index of Si semiconductor is as high as 14, cheap and environmentally friendly, rich in raw material reserves, low density, high melting point, high specific strength and good thermophysical properties, known as the most promising class of medium temperature thermoelectric materials. Currently Mg 2 The traditional preparation method of Si thermoelectric materials is the direct smelting and compounding of elemental Mg powder and Si powder. The preparation technologies mainly include mechanical alloying (MA), hot press...

Claims

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Application Information

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IPC IPC(8): C01B33/06B82Y40/00
CPCY02P20/10
Inventor 陈少平樊文浩孟庆森易堂红孙政李育德
Owner TAIYUAN UNIV OF TECH
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