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
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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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