Bi2O2Se-based thermoelectric material and preparation method thereof

A technology of thermoelectric materials and bulk materials, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve the problems of high sintering energy consumption, high operation difficulty, long reaction time, etc., and achieve short sintering time and performance change Obvious effect of improving ZT value

Active Publication Date: 2015-01-07
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To sum up, hot press sintering synthesis has the disadvantages of long reaction time, high energy consumption for sintering, and high difficulty in operation.

Method used

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  • Bi2O2Se-based thermoelectric material and preparation method thereof
  • Bi2O2Se-based thermoelectric material and preparation method thereof
  • Bi2O2Se-based thermoelectric material and preparation method thereof

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preparation example Construction

[0032] The present invention provides a Bi 2 O 2 The preparation method of Se-based thermoelectric material includes the following steps:

[0033] 1) First press Bi 2-x Sn x O 2 The stoichiometric ratio of Se, when x=0, weigh Bi 2 O 3 , Bi and Se powder; when 0 2 O 3 , Bi, Se and SnO 2 Powder

[0034] 2) After mixing the powder in step 1), vacuum seal the tube, encapsulate the powder in a vacuum quartz glass tube, and calcinate at 475°C to 525°C to complete the phase formation phase. The calcining time is 6h~ 24h;

[0035] 3) Put the calcined powder into the graphite mold, after compaction, SPS spark plasma is used to sinter into a bulk material, the sintering temperature is 525℃~575℃, and the heating rate of sintering is generally 119℃ / min~131℃ / min , The holding time is 5min~30min, the sintering pressure is 30MPa~80MPa, then the required Bi 2 O 2 Se-based thermoelectric material.

Embodiment 1

[0038] Follow Bi 2 O 2 The proportion of Se, weighed Bi 2 O 3 , Bi and Se powders, after mixing, vacuum sealing the tube and then calcining, sintering in air at 525°C for 24 hours to complete the phase formation stage of the material phase. Then crush, mix, and use SPS spark plasma sintering furnace to sinter at 575℃, sintering pressure is 50MPa, heating rate is 131℃ / min, and holding time for 5min can obtain Bi 2 O 2 Se-based thermoelectric material. It is characterized by figure 1 , 2 shows. Its ZT value can reach 0.065 at 500°C.

Embodiment 2

[0040] Follow Bi 2 O 2 The proportion of Se, weighed Bi 2 O 3 , Bi and Se powders, after mixing, vacuum sealing the tube and then calcining, sintering in air at 500℃ for 12h, complete the phase formation stage of the material phase. Then crush, mix, and use SPS spark plasma sintering furnace to sinter at 550℃, sintering pressure is 80MPa, heating rate 125℃ / min, heat preservation 15min can obtain Bi 2 O 2 Se-based thermoelectric material. It is characterized by image 3 , 4 shows. Its ZT value can reach 0.054 at 500°C.

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Abstract

The invention belongs to the field of oxide ceramic materials and preparation methods thereof and particularly relates to a Bi2O2Se-based thermoelectric material and a preparation method thereof. The method comprises the steps of firstly, weighing Bi2O3 powder, Bi powder, Se powder and SnO2 powder according to the stoichiometric ratio: Bi2-xSnxO2Se (0<=x<=0.10), mixing, then, carrying out vacuum tube sealing, and calcining to finish a phase forming stage; and compacting the calcined powder, and sintering by using SPS discharge plasmas to obtain the pure-phase and Sn doped Bi2O2Se-based thermoelectric material. Compared with the traditional hot-pressed sintering method, the preparation method has the advantages of uniformity in heating, high heating speed, short sintering time and the like; the defects of long reaction time, high sintering energy consumption, high operation difficulty and the like in the prior art can be effectively overcome; and the performance of a sintered sample is obviously changed, and the ZT value of the Bi2O2Se-based thermoelectric material can be greatly increased after Sn is doped.

Description

Technical field [0001] The invention belongs to the field of oxide ceramic materials and their preparation, and specifically relates to a Bi 2 O 2 Se-based thermoelectric material and preparation method thereof. Background technique [0002] Thermoelectric material is a kind of functional material that has been discovered very early, and it can realize the mutual conversion between heat energy and electric energy in a solid state without moving parts. In recent years, with the intensification of the energy crisis and the consequent severe environmental problems, the research of thermoelectric materials has attracted more and more attention. Especially in the fields of exhaust gas recycling, waste heat recovery, and solar energy combined use, the use of thermoelectric materials can effectively improve the comprehensive utilization efficiency of energy. Thermoelectric materials can be used as a carrier for the mutual conversion of heat energy and electric energy. Thermoelectric de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B19/00
CPCC01B19/002C01P2002/72C01P2004/03
Inventor 詹斌林元华
Owner TSINGHUA UNIV
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