Ultrafast preparation method of high-performance SnTe based thermoelectric material
A high-performance technology for thermoelectric materials, applied in the field of ultra-fast preparation of high-performance SnTe-based thermoelectric materials, can solve the problems of unfavorable commercial application, long cycle, complicated process, etc., and achieve short preparation cycle, fast reaction speed and good repeatability Effect
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Embodiment 1
[0034] A method for ultrafast preparation of high-performance SnTe-based thermoelectric materials, comprising the following steps:
[0035] 1) According to the chemical formula SnTe (ie when M x sn 1-x The stoichiometric ratio of each element in Te in x=0) Weigh Sn powder, Te powder as raw material, raw material powder gross mass 4g, then they are ground and mixed uniformly, and the diameter of the uniformly mixed powder is pressed into the cylindrical shape of 10mm Block block (5MPa holding pressure 5min);
[0036] 2) End-ignite the block obtained in step 1) in a vacuum atmosphere to initiate a self-propagating high-temperature synthesis reaction (SHS), and cool naturally after the reaction is completed;
[0037] 3) Grinding the product obtained in step 2) into powder, performing plasma activation sintering (PAS), packing the powder into a 16mm graphite mold for compaction, and then sintering under the conditions of a vacuum of less than 10Pa and a sintering pressure of 40M...
Embodiment 2
[0040] A method for ultrafast preparation of high-performance SnTe-based thermoelectric materials, comprising the following steps:
[0041] 1) According to the chemical formula Cr 0.02 sn 0.98 Te (i.e. when M x sn 1-x The stoichiometric ratio of each atom in Te when x=0.02 and M is Cr) Weigh Sn powder, Te powder and Cr powder as raw materials, the total mass of raw powder is 4g, then they are ground and mixed uniformly, and the uniformly mixed powder is pressed Form a cylindrical block with a diameter of 10mm (5MPa for 5 minutes);
[0042] 2) End-ignite the block obtained in step 1) in a vacuum atmosphere to initiate a self-propagating high-temperature synthesis reaction (SHS), and cool naturally after the reaction is completed;
[0043] 3) Grinding the product obtained in step 2) into powder, performing plasma-activated sintering (PAS), packing the powder into a 16mm graphite mold for compaction, and then sintering under the conditions of a vacuum of less than 10Pa and a ...
Embodiment 3
[0046] A method for ultrafast preparation of high-performance SnTe-based thermoelectric materials, comprising the following steps:
[0047] 1) According to the chemical formula Zn 0.02 sn 0.98 Te (i.e. when M x sn 1-x The stoichiometric ratio of each atom in Te when x=0.02 and M is Zn) Weigh Sn powder, Te powder and Zn powder as raw material, the total mass of raw material powder is 4g, then they are ground and mixed uniformly, and the uniformly mixed powder is pressed Form a cylindrical block with a diameter of 10mm (5MPa for 5 minutes);
[0048] 2) End-ignite the block obtained in step 1) in a vacuum atmosphere to initiate a self-propagating high-temperature synthesis reaction (SHS), and cool naturally after the reaction is completed;
[0049] 3) Grinding the product obtained in step 2) into powder, performing plasma-activated sintering (PAS), packing the powder into a 16mm graphite mold for compaction, and then sintering under the conditions of a vacuum of less than 10P...
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