One-step superfast preparation method for SnSe block thermoelectric material

A thermoelectric material, an ultra-fast technology, used in thermoelectric device junction lead-out materials, thermoelectric device manufacturing/processing, binary selenium/tellurium compounds, etc., can solve unfavorable commercial applications, long reaction time, mechanical problems such as low performance, to achieve the effect of controlling product composition, shortening preparation cycle, and optimizing thermoelectric performance

Inactive Publication Date: 2017-11-07
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the traditional synthesis method, the Bridgman method is mostly used for the preparation of single crystal SnSe, and the single crystal preparation cycle is longer than 3 weeks, which requires high equipment requirements, complicated process and high cost, and low mechanical properties; currently, polycrystalline SnSe is prepared by melting annealing. Spark plasma activation sintering, the preparation cycle is ≥ 4 days; for practical applications, it is very difficult to prepare thermoelectric modules with single crystal materials, and the main reaction of polycrystalline SnSe preparation takes a long time, more than 4 days, can be high power consumption
These preparation methods have a long cycle and complicated process, which is not conducive to commercial application

Method used

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  • One-step superfast preparation method for SnSe block thermoelectric material
  • One-step superfast preparation method for SnSe block thermoelectric material
  • One-step superfast preparation method for SnSe block thermoelectric material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A new method for ultra-fast preparation of SnSe bulk thermoelectric materials in one step, which includes the following steps:

[0038] 1) Weigh 11g of Sn powder and Se powder as raw material according to the stoichiometric ratio of 1:1.01, mix the reactants evenly with a mortar; cold press the reactants at 4MPa for 2min to obtain a cylindrical body with a diameter of Φ16mm and a height of 13mm;

[0039] 2) Place the cylindrical blank in a steel mold, and then put the steel mold in the reaction device. The device is filled with 50kPa argon gas, and the argon arc welding machine is started, so that the tungsten needle tip discharges and arcs to trigger the chemical reaction of the blank After the reaction, an axial high pressure of 600 MPa was applied in situ immediately after 2 s, and the pressure was maintained for 10 s to make it densified, and a dense SnSe bulk thermoelectric material was obtained.

[0040] In this embodiment, the entire preparation process is shorter than ...

Embodiment 2

[0043] A new method for ultra-fast preparation of SnSe bulk thermoelectric materials in one step, which includes the following steps:

[0044] 1) Weigh 11g of Sn powder and Se powder as raw material according to the stoichiometric ratio of 1:1.03, mix the reactants evenly with a mortar; cold press the reactants at 4MPa for 2min to obtain a cylindrical body with a diameter of Φ16mm and a height of 13mm;

[0045] 2) Place the cylindrical blank in a steel mold, and then put the steel mold into the reaction device. The device is filled with 50kPa argon gas, and the argon arc welding machine is started, so that the tungsten needle tip discharges and arcs to trigger the chemical reaction of the blank After the reaction, an axial high pressure of 800 MPa was applied immediately after 2 s, and the pressure was maintained for 10 s to make it densified, and a dense SnSe bulk thermoelectric material was obtained.

[0046] Figure 5 Is the XRD pattern of the block obtained by Figure 5 It can be...

Embodiment 3

[0048] A new method for ultra-fast preparation of SnSe bulk thermoelectric materials in one step, which includes the following steps:

[0049] 1) Weigh 24g of Sn powder and Se powder as a raw material according to a stoichiometric ratio of 1:1.03, and mix it with a mortar to obtain a reactant; the reactant is cold pressed at 5MPa for 2 minutes to obtain a cylindrical body with a diameter of Φ16mm and a height of 25mm;

[0050] 2) Place the cylindrical blank in a steel mold, and then put the steel mold into the reaction device. The device is filled with 50kPa argon gas, and the argon arc welding machine is started, so that the tungsten needle tip discharges and arcs to trigger the chemical reaction of the blank After the reaction, an axial high pressure of 600 MPa was applied in situ immediately after 1 s, and the pressure was maintained for 10 s to make it densified, and a dense SnSe bulk thermoelectric material was obtained.

[0051] Image 6 (a) is the XRD pattern of the block perp...

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Abstract

The invention provides a one-step superfast preparation method for a SnSe block thermoelectric material. The method is characterized in that in the protection of inert atmosphere, Sn powder and Se powder are taken as initial raw materials, argon tungsten arc welding is firstly adopted to trigger a chemical reaction, and high pressure is fast raised in situ in seconds to prepare the compact SnSe block thermoelectric material. The method is fast in reaction speed, simple in process, and saved in energy consumption. The whole preparation method can be shortened in 5 min, so that the method is suitable for commercial application and large-scale production.

Description

Technical field [0001] The invention belongs to the field of new energy materials, and specifically relates to a new method for ultra-fast preparation of SnSe bulk thermoelectric materials in one step. Background technique [0002] With the rapid development of global industrialization and the continuous improvement of people’s living standards, the gradual reduction of global fossil energy and environmental pollution have become more and more serious, and the substantial increase in energy demand has made non-renewable fossil fuel resources increasingly depleted and rising fuel Prices control the political and military trends of the entire world. With the development of new and environmentally friendly renewable energy and energy conversion technologies, developed countries have attracted great attention. Among them, the environmentally coordinated thermoelectric conversion technology (also known as thermoelectric technology) that directly converts heat energy into electrical en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B19/04H01L35/16H01L35/34
CPCC01B19/007C01P2006/32C01P2006/80C01P2002/72H10N10/852H10N10/01
Inventor 唐新峰付婕妃胡铁铮杨东旺张政楷苏贤礼鄢永高
Owner WUHAN UNIV OF TECH
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