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New method for quickly preparing high-performance PbS(1-x)Sex based thermoelectric material

A high-performance technology for thermoelectric materials, applied in the field of rapid preparation of high-performance PbS1-xSex-based thermoelectric materials, can solve the problems of element volatilization loss, long reaction time, and low melting point of elements, and achieve fast reaction speed, simple equipment, and repeatability Good results

Active Publication Date: 2013-12-11
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the melting method requires a high temperature (>1100°C), while the melting point of the elements themselves is very low, such as Pb (327°C), S (115°C) and Se (221°C), which may cause the loss of element volatilization, and at the same time The required reaction time is longer, therefore, there are certain deficiencies in terms of high efficiency and energy saving

Method used

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  • New method for quickly preparing high-performance PbS(1-x)Sex based thermoelectric material
  • New method for quickly preparing high-performance PbS(1-x)Sex based thermoelectric material
  • New method for quickly preparing high-performance PbS(1-x)Sex based thermoelectric material

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Embodiment 1

[0031] A rapid preparation of high performance PbS 1-x Se x A new method based on thermoelectric materials, which includes the following steps:

[0032] 1) According to the chemical formula PbSe （1+0.02） (i.e. PbS 1-x+y Se x+z The stoichiometric ratio of each atom in x=1.0, y=0, z=0.02) Weigh Pb powder and Se powder as raw materials (Note: The excess of Se is 2%, that is, the value of z is to compensate for Se in the reaction volatilization loss), the total mass is 4.5g, and then they are ground and mixed evenly, and the uniformly mixed powder is pressed into a cylindrical block with a diameter of 10mm (the pressing process is: first hold the pressure at 5MPa for 5min, and then hold at 8MPa Press for 10min);

[0033] 2) End-ignite the block obtained in step 1) in an air atmosphere to initiate a self-propagating reaction (SHS) and cool naturally after the reaction is completed;

[0034] 3) Grind the above-mentioned product into powder, put the powder into a 15mm graphite ...

Embodiment 2

[0037] A rapid preparation of high performance PbS 1-x Se x A new method based on thermoelectric materials, which includes the following steps:

[0038] 1) Press PbS (0.2+0.02) Se 0.8 (i.e. PbS 1-x+y Se x+z The stoichiometric ratio of each atom in x=0.8, y=0.02, z=0) Weigh Pb powder, S powder, and Se powder as raw materials (Note: The excess of S is 2%, that is, the value of y is to compensate for S Volatilization loss in the reaction), the total mass is 4.5g, and then they are ground and mixed uniformly, and the uniformly mixed powder is pressed into a cylindrical block block with a diameter of 10mm (the pressing process is: first press at 5MPa for 5min, then Hold pressure at 8MPa for 10min);

[0039]2) End-ignite the block obtained in step 1) in an air atmosphere to initiate a self-propagating reaction (SHS) and cool naturally after the reaction is completed;

[0040] 3) Grinding the above obtained product into powder for XRD test.

[0041] from figure 2 It can be ...

Embodiment 3

[0043] A rapid preparation of high performance PbS 1-x Se x A new method based on thermoelectric materials, which includes the following steps:

[0044] 1) Press PbS (0.4+0.02) Se 0.6 (i.e. PbS 1-x+y Se x+z The stoichiometric ratio of each atom in x=0.6, y=0.02, z=0) Weigh Pb powder, S powder, and Se powder as raw materials (Note: The excess of S is 2%, to compensate for the volatilization loss of S in the reaction ), the total mass is 4.5g, and then they are ground and mixed evenly, and the uniformly mixed powder is pressed into a cylindrical block with a diameter of 10mm (the pressing process is: first press at 5MPa for 5min, then at 8MPa for 10min) ;

[0045] 2) End-ignite the block obtained in step 1) in an air atmosphere to initiate a self-propagating reaction (SHS) and cool naturally after the reaction is completed;

[0046] 3) Grind the above-mentioned product into powder, put the powder into a 15mm graphite mold for compaction, and then conduct discharge plasma ...

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Abstract

The invention relates to a new method for quickly preparing a high-performance PbS(1-x)Sex based thermoelectric material. The new method comprises the following steps of: 1) weighing Pb powder, S powder and Se powder as raw materials according to the stoichiometric ratio of all the atoms in PbS(1-x+y)Se(x+z), wherein x is greater than or equal to 0 and less than 1.0, y is equal to 0.02 and z is equal to 0; and when x is equal to 1.0, y is equal to 0 and z is equal to 0.02; next, grinding the powdery raw materials and mixing evenly, and then pressing into blocks; 2) arousing the self-propagating reaction of the blocks obtained in the step 1), naturally cooling after the reaction is completed, thereby obtaining a single-phase PbS(1-x)Sex solid solution; 3) grinding the PbS(1-x)Sex solid solution into powder, performing discharge plasma activated sintering to obtain the high-performance PbS(1-x)Sex based thermoelectric material. The new method provided by the invention has the advantages of high reaction speed, simple process, high efficiency and energy conservation, good repeatability and the like; the whole preparation process can be completed in 0.5 hour.

Description

technical field [0001] The invention belongs to the technical field of preparation of new energy materials, in particular to a method for rapidly preparing high-performance PbS 1-x Se x A new approach to thermoelectric materials. Background technique [0002] The development of new and efficient energy conversion materials and technologies can alleviate the increasing damage to the natural environment and the depletion of fossil energy. At present, many scientists around the world are focusing their attention on finding and developing thermoelectric conversion technology—a renewable new energy conversion technology. [0003] Thermoelectric conversion technology can realize direct mutual conversion between electric energy and thermal energy through the Seebeck effect and Peltier effect of thermoelectric materials. As an environmentally friendly energy conversion technology, it has great potential in recycling industrial waste heat and waste heat, and automobile exhaust gas....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05C22C1/10C22C11/00
Inventor 唐新峰张强
Owner WUHAN UNIV OF TECH
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