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Preparation method of nano-sic composite mg-si-sn-based thermoelectric material

A kind of thermoelectric material and nanotechnology, which is applied in the manufacture/processing of thermoelectric devices, etc., can solve the problems of large specific surface area, inability to achieve uniform dispersion, and easy agglomeration of nanoparticles, and achieve wide composition range, short ball milling and sintering time, Effect of inhibiting oxidation and volatilization

Active Publication Date: 2017-03-29
中国冶金科技成果转化有限公司
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  • Summary
  • Abstract
  • Description
  • 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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  • Preparation method of nano-sic composite mg-si-sn-based thermoelectric material
  • Preparation method of nano-sic composite mg-si-sn-based thermoelectric material
  • Preparation method of nano-sic composite mg-si-sn-based thermoelectric material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1) Induction smelting: using Mg block (purity 99.99%) and 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 the alumina crucible, and use induction melting equipment to melt in an argon atmosphere. The melting time is 75s and the maximum power is 16kw to obtain Mg 2 Sn ingot.

[0024] 2) One-time mechanical ball milling combined with spark plasma sintering: the Mg 2 The ingot of Sn is crushed in a vacuum glove box with an oxygen content lower than 0.5ppm, and the ratio is Mg according to the chemical formula 2 Sn / SiC 0.005 Weigh SiC nano-powder and crushed ingots and put them into cemented carbide (WC) ball milling pots, set the ball-to-material ratio to 15:1 (mass ratio), the speed to 500r / min, and the ball milling time to 3h, in an argon atmosphere Ball milling is carried out under a protective atmosphere; the powder after a mechanical ball mill is placed in a vacuum ...

Embodiment 2

[0027] 1) Induction smelting: using 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 Proportionally weighed, put the prepared raw materials into an alumina crucible, and use induction melting equipment to melt 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) One-time mechanical ball milling combined with spark plasma sintering: the Mg 2 Si 0.3 sn 0.7 The ingot is 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 Si 0.3 sn 0.7 / SiC 0.01, weigh the SiC nano-powder and the broken ingot into the cemented carbide (WC) ball mill tank, set the ball-to-material ratio to 15:1 (mass ratio), the speed is 500r / min, the ball milling time is 3h, in argon Ball milling is carried out under a protective atmosphere of air; the powde...

Embodiment 3

[0031] 1) Induction smelting: using 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 Proportionally weighed, put the prepared raw materials into an alumina crucible, and use induction melting equipment to melt 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 crushed in a vacuum glove box with an oxygen content of less than 0.5ppm, and the ratio of Mg according to the chemical formula is 2 Si 0.4 sn 0.6 / SiC 0.01 , weigh the SiC nano-powder and the broken ingot into the cemented carbide (WC) ball mill tank, set the ball-to-material ratio to 15:1 (mass ratio), the speed is 500r / min, the ball milling time is 3h, in argon Ball milling is carried out under a protective atmosphere of air; the powder that has u...

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Abstract

The invention relates to a preparation method of a nano-SiC composite Mg-Si-Sn-based thermoelectric material. Firstly, induction melting equipment is used to melt Mg, Si and Sn bulk raw materials into ingots, and then the nano-SiC powder weighed according to the chemical formula ratio and the broken ingots are put into a ball milling tank together, and mechanical ball milling equipment is used in argon Carry out a ball mill under an air atmosphere, and then place the graphite mold loaded with the ball mill powder in a spark plasma sintering chamber, and sinter it into a block under a vacuum atmosphere; Secondary ball milling, followed by sintering under vacuum atmosphere to obtain highly dense Mg2Si1‑xSnx / SiCy (0≤x≤1.0,0

Description

technical field [0001] The invention relates to a preparation method of a nano-SiC composite Mg-Si-Sn-based thermoelectric material. Background technique [0002] As a new type of energy material, thermoelectric materials utilize the transport and interaction of carriers (electrons or holes) and phonons inside solids to realize the direct mutual conversion of thermal energy and electrical energy. The advantages of Mg-Si-Sn-based thermoelectric materials as thermoelectric materials are abundant raw materials, low price, non-toxic and non-polluting, high thermoelectric performance potential, and are considered to be environmentally friendly green new energy materials. The thermoelectric figure of 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 its application field. In recent years, on the basis of element doping to improve the th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/05C22C1/10C22C23/00B22F3/105H01L35/34H10N10/01
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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