Method for preparing nanometer SiC composite Mg-Si-Sn-based thermoelectric material

A mg-si-sn, thermoelectric material technology, applied in the manufacture/processing of thermoelectric devices, etc., can solve the problems of large specific surface area of ​​nanoparticles, inability to achieve uniform dispersion, easy to agglomerate, etc., to achieve a wide range of components, ball milling and Short sintering time, the effect of inhibiting oxidation and volatilization

Active Publication Date: 2016-04-27
中国冶金科技成果转化有限公司
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the direct mixing process of adding nano-powder externally, there will be a problem that due to the large specific surface area and high activity of the nano-particles, they are prone to agglomeration and cannot achieve uniform dispersion.

Method used

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  • Method for preparing nanometer SiC composite Mg-Si-Sn-based thermoelectric material
  • Method for preparing nanometer SiC composite Mg-Si-Sn-based thermoelectric material
  • Method for preparing nanometer SiC composite Mg-Si-Sn-based thermoelectric material

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Experimental program
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Effect test

Embodiment 1

[0023] 1) Induction melting: Mg block (purity 99.99%), Sn block (purity 99.99%) as raw materials, according to the chemical formula Mg 2 Sn proportioning and weighing, put the prepared raw materials into an alumina crucible, and use induction melting equipment for smelting in an argon atmosphere. The smelting time is 75s and the maximum power is 16kw to obtain Mg 2 Sn ingot.

[0024] 2) A mechanical ball milling combined with spark plasma sintering: Mg 2 Sn ingots are placed in a vacuum glove box with an oxygen content of less than 0.5ppm, and the ratio is Mg according to the chemical formula 2 Sn / SiC 0.005 Weigh the SiC nano powder and the broken ingot into a cemented carbide (WC) ball mill tank, set the ball-to-battery ratio to 15:1 (mass ratio), rotate speed 500r / min, ball milling time 3h, in argon gas Ball milling is carried out under a protective atmosphere; the powder that has been mechanically milled is placed in a vacuum glove box with an oxygen content of less than 0.5 ppm...

Embodiment 2

[0027] 1) Induction melting: Mg block (purity 99.99%), Si block (purity 99.999%), Sn block (purity 99.99%) as raw materials, according to the chemical formula Mg 2 Si 0.3 Sn 0.7 Proportioning and weighing, put the prepared raw materials into an alumina crucible, and use induction melting equipment for smelting in an argon atmosphere. The melting time is 75s and the maximum power is 17kw to obtain Mg 2 Si 0.3 Sn 0.7 Ingot.

[0028] 2) A mechanical ball milling combined with spark plasma sintering: Mg 2 Si 0.3 Sn 0.7 The cast ingot is broken in a vacuum glove box with an oxygen content of less than 0.5ppm, and the ratio is Mg according to the chemical formula 2 Si 0.3 Sn 0.7 / SiC 0.01 , Weigh the SiC nano powder and the broken ingots into a cemented carbide (WC) ball mill tank, set the ball-to-battery ratio to 15:1 (mass ratio), rotate speed 500r / min, ball milling time 3h, Ball milling is carried out under a protective atmosphere of air; the powder that has been mechanically milled o...

Embodiment 3

[0031] 1) Induction melting: Mg block (purity 99.99%), Si block (purity 99.999%), Sn block (purity 99.99%) as raw materials, according to the chemical formula Mg 2 Si 0.4 Sn 0.6 Proportioning and weighing, put the prepared raw materials into an alumina crucible, and use induction melting equipment for smelting in an argon atmosphere. The melting time is 80s and the maximum power is 18kw to obtain Mg 2 Si 0.4 Sn 0.6 Ingot.

[0032] 2) One-time mechanical ball milling combined with spark plasma sintering: the obtained ingot is placed in a vacuum glove box with an oxygen content of less than 0.5 ppm and broken, and the ratio is Mg according to the chemical formula 2 Si 0.4 Sn 0.6 / SiC 0.01 , Weigh the SiC nano powder and the broken ingots into a cemented carbide (WC) ball mill tank, set the ball-to-battery ratio to 15:1 (mass ratio), rotate speed 500r / min, ball milling time 3h, Ball milling is carried out under a protective atmosphere of air; the powder that has been mechanically mill...

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Abstract

The invention relates to a method for preparing a nanometer SiC composite Mg-Si-Sn-based thermoelectric material. The method comprises the following steps: first, melting Mg, Si and Sn block materials into cast ingots by using induction melting equipment, then putting the weighed nanometer SiC powder and the crushed cast ingots into a ball milling jar, and carrying out primary ball milling in argon atmosphere by adopting mechanical ball milling equipment; then, putting a graphite mould loading the primary ball-milled powder in a discharge plasma sintering chamber, and sintering into blocks in vacuum atmosphere; crushing the sintered blocks, carrying out secondary ball milling in the argon atmosphere, then sintering in the vacuum atmosphere, and thus obtaining highly-dense Mg2Si1-xSnx/SiCy(x is more than or equal to 0 and less than or equal to 1.0; y is less than or equal to 0.05) blocks. The method has the advantages of being low in cost, wide in range of applicable components, easy to operate and good in reliability, can realize dispersive distribution of nanometer SiC particles in a Mg2Si1-xSnx matrix, and meanwhile can refine the matrix grain size and improve the density and machinability of the materials.

Description

Technical field [0001] The invention relates to a preparation method of nano SiC composite Mg-Si-Sn-based thermoelectric material. Background technique [0002] As a new type of energy material, thermoelectric materials use the transport and interaction of carriers (electrons or holes) and phonons in a solid to realize the direct conversion of heat and electric energy. The advantages of Mg-Si-Sn-based thermoelectric materials as thermoelectric materials are that they are rich in raw materials, low in price, non-toxic and non-polluting, and have high thermoelectric performance potential. They are considered as environmentally friendly green new energy materials. The thermoelectric merit of this system material is still It has been hovering around 1, if the thermoelectric performance can be further optimized, it will speed up the pace of its practical application and expand the application field. In recent years, on the basis of element doping to improve the thermoelectric propert...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05C22C1/10C22C23/00B22F3/105H01L35/34
CPCC22C1/05C22C1/10C22C23/00B22F3/105H10N10/01
Inventor 张忻郑亮刘洪亮李松浩周子群张久兴刘燕琴
Owner 中国冶金科技成果转化有限公司
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