Preparation method for Mg3Sb2-based thermoelectric material

A thermoelectric material, mg3-xaxsb2-yby technology, applied in the field of preparation of Mg3Sb2-based thermoelectric materials, can solve the problems of low thermoelectric figure of merit, achieve the effects of improving production efficiency, simple process operation, and wide composition range

Inactive Publication Date: 2016-06-22
BEIJING UNIV OF TECH
View PDF2 Cites 23 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In 2006, the Kauzlarich group at the University of California directly synthesized pure Mg using a solid-state reaction method at a relatively low temperature (around 800°C) using a material r...

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method for Mg3Sb2-based thermoelectric material
  • Preparation method for Mg3Sb2-based thermoelectric material
  • Preparation method for Mg3Sb2-based thermoelectric material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1) Induction melting: use Mg block (purity 99.99%) and Sb block (purity 99.99%) as raw materials, according to the chemical formula Mg 3 Sb 2 Argon gas (P0 2 ≤2.47×10 -29 Pa) Proportioning and weighing in an atmosphere, put the prepared raw materials into a quasi-sealed melting crucible, and use induction melting equipment for melting in the same argon atmosphere. The melting time is 80s and the maximum power is 20kw to obtain Mg 3 Sb 2 Ingot.

[0023] 2) Mechanical ball mill: Place the obtained ingots in a vacuum glove box with argon gas to crush them, and put the crushed ingots into cemented carbide ball mill tanks with a ball to material ratio of 15:1 (mass ratio). Under the protective atmosphere of argon gas, mechanical ball milling equipment is used for ball milling. The speed of the ball milling equipment is 500r / min and the milling time is 3h. Under this condition, the two ingots are broken and refined, and they are mixed uniformly to achieve alloying;

[0024] 3) Spa...

Embodiment 2

[0026] 1) Induction melting: Mg block (purity 99.99%), Sb block (purity 99.99%), Ag block (purity 99.99%) as raw materials, according to the chemical formula Mg 2.98 Ag 0.02 Sb 2 Argon gas (P0 2 ≤2.47×10 -29 Pa) Proportioning and weighing in an atmosphere, put the prepared raw materials into a quasi-sealed melting crucible, and use induction melting equipment for melting in the same argon atmosphere. The melting time is 100s and the maximum power is 18kw to obtain Mg 2.98 Ag 0.02 Sb 2 Ingot.

[0027] 2) Mechanical ball mill: Place the obtained ingots in a vacuum glove box with argon gas to crush them, and put the crushed ingots into cemented carbide ball mill tanks with a ball to material ratio of 15:1 (mass ratio). Under the protective atmosphere of argon gas, mechanical ball milling equipment is used for ball milling. The speed of the ball milling equipment is 500r / min and the milling time is 3h. Under this condition, the two ingots are broken and refined, and they are mixed uni...

Embodiment 3

[0030] 1) Induction melting: Mg block (purity 99.99%), Sb block (purity 99.99%), Ag block (purity 99.99%) as raw materials, according to the chemical formula Mg 2.95 Ag 0.05 Sb 2 Argon gas (P0 2 ≤2.47×10 -29 Pa) Proportioning and weighing in an atmosphere, put the prepared raw materials into a quasi-sealed melting crucible, and use induction melting equipment for melting in the same argon atmosphere. The melting time is 100s and the maximum power is 18kw to obtain Mg 2.95 Ag 0.05 Sb 2 Ingot.

[0031] 2) Mechanical ball mill: Place the obtained ingots in a vacuum glove box with argon gas to crush them, and put the crushed ingots into cemented carbide ball mill tanks with a ball to material ratio of 15:1 (mass ratio). Under the protective atmosphere of argon gas, mechanical ball milling equipment is used for ball milling. The speed of the ball milling equipment is 500r / min and the milling time is 3h. Under this condition, the two ingots are broken and refined, and they are mixed uni...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

Provided is a preparation method for a Mg3Sb2-based thermoelectric material. A Mg3-xAxSb2-yBy block is prepared through the method combining induction smelting and the spark plasma sintering (SPS) technology; A is Ag, or Cu or the like, B is Si, or Ge, or Sn or the like, x is larger than or equal to 0 but smaller than or equal to 0.30, and y is larger than or equal to 0 but smaller than or equal to 0.20. The method includes the following steps that firstly, under the protection of high-purity argon gas which is deoxidized through an efficient deoxidizing agent, elementary raw materials are weighed according to stoichiometric ratios and placed into quasi-sealed smelting equipment to be smelted to ingots, and then the ingots are crushed; the crushed ingots are placed into a sintered carbide ball milling tank, and ball milling is carried out through mechanical ball milling equipment under the high-purity argon atmosphere; and then the ball-milled powder is loaded into a graphite die and then placed in an SPS cavity, and the high-compactness block is obtained after sintering under the vacuum atmosphere. According to the preparation method, cost is low, the ingredient application range is wide, operation is easy, reliability is high, and process parameters are easy to control; the problem that the Mg element is volatile and prone to oxidation can be solved, and the compactness and machinability of the material are improved.

Description

Technical field [0001] The invention belongs to the technical field of preparation of semiconductor thermoelectric materials and relates to Mg 3 Sb 2 Preparation method of base thermoelectric material. Background technique [0002] Thermoelectric material is a kind of functional material that realizes the mutual conversion of electric energy and heat energy through the movement of carriers (electrons or holes) inside a solid, and has broad application prospects in cooling or heating. The main properties of thermoelectric materials use dimensionless figure of merit ZT=Tα 2 σ / κ characterization. Here α is the Seebeck coefficient of the material, σ is the electrical conductivity, and κ is the thermal conductivity. Power generation devices and refrigeration devices made of thermoelectric materials or in the field of industrial waste heat and waste heat power generation, semiconductor refrigeration are widely used. The device made of thermoelectric materials has outstanding advantag...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C22C1/02B22F9/04B22F3/105
CPCC22C1/02B22F3/105B22F9/04B22F2009/043
Inventor 张忻周子群刘洪亮李松浩郑亮张久兴刘燕琴
Owner BEIJING UNIV OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap