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BiAgSeS-based bulk thermoelectric material with nano layered crystal grain structure and preparation method

A grain structure, nano-layered technology, applied in the field of new energy material preparation-combustion synthesis, can solve the problems of cumbersome and complex reaction process, high equipment requirements, multiple energy sources, etc., and achieve simple process, fast preparation process and short preparation time Effect

Pending Publication Date: 2021-02-19
CHINA ELECTRIC POWER RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the synthesis of BiAgSeS-based thermoelectric materials mainly adopts long-term melting reaction, but because the reaction process is cumbersome and complicated, and it needs to consume more energy, the requirements for equipment are also high.

Method used

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  • BiAgSeS-based bulk thermoelectric material with nano layered crystal grain structure and preparation method
  • BiAgSeS-based bulk thermoelectric material with nano layered crystal grain structure and preparation method
  • BiAgSeS-based bulk thermoelectric material with nano layered crystal grain structure and preparation method

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preparation example Construction

[0026] A BiAgSeS-based bulk thermoelectric material with a nano-layered grain structure and a preparation method thereof, comprising the following steps:

[0027] 1) Mix Bi powder, Ag powder, Se powder and S powder evenly according to the ratio of substances to 1:1:1:1 to obtain a reactant; the reactant is a powder or pressed into an ingot;

[0028] 2) The reactant obtained in step 1) undergoes a thermal explosion synthesis reaction at a temperature above 500° C. under vacuum or an inert gas. The reaction time does not exceed 2 minutes. After the reaction is completed, it is cooled or quenched to obtain a BiAgSeS cubic phase compound; specifically, the thermal explosion temperature is 500°C, 700°C, 800°C, 850°C, 875°C, 900°C or 925°C, heat explosion for 2 minutes at 500°C, 1 minute for 700°C and above.

[0029] 3) Grinding the BiAgSeS cubic phase compound obtained in step 2) into powder, and then performing plasma activation and sintering to obtain a high-performance BiAgSeS-b...

Embodiment 1

[0035] 1) Weigh Bi powder, Ag powder, Se powder and S powder as raw materials according to the ratio of substances 1:1:1:1, the total amount is 5g, mix them evenly in an agate mortar, and the obtained mixed powder is used as the The reactant was put into a steel grinding tool, and the pressure of 6MPa was adopted on the tablet press and the pressure was kept for 5min to make a 12mm ingot;

[0036] 2) Thermal Explosion Synthesis (TE) at different temperatures: vacuum-seal the ingot in a quartz glass tube, then quickly place the quartz glass tube into a constant temperature furnace, heat-explode at 500°C for 2 minutes, take out the sample, and then cool it naturally. A single-phase BiAgSeS compound was obtained.

Embodiment 2

[0038] The difference from Example 1 is that the thermal explosion was performed at 700° C. for 1 min.

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Abstract

The invention relates to a BiAgSeS-based bulk thermoelectric material with a nano layered crystal grain structure and a preparation method, and the preparation method comprises the following specificsteps: mixing Bi powder, Ag powder, Se powder, S powder and the like as raw materials according to the mass ratio of 1:1:1:1 to obtain a reactant; carrying out thermal explosion synthesis reaction onthe reactant to obtain a BiAgSeS compound; and grinding the BiAgSeS compound into powder, and carrying out plasma activated sintering to obtain the BiAgSeS-based bulk thermoelectric material with thenano layered crystal grains. The BiAgSeS-based bulk thermoelectric material with ZT reaching 0.46 ( when at 550 DEG C) is prepared within 30 minutes by adopting a thermal explosion synthesis and plasma activated sintering process, and the preparation method has the advantages of short preparation time, low energy consumption, simple process, low equipment requirement, good repeatability, suitability for large-scale production and the like.

Description

technical field [0001] The invention belongs to the technical field of new energy material preparation-combustion synthesis, and specifically relates to a BiAgSeS-based bulk thermoelectric material with a nano-layered grain structure and a preparation method thereof. Background technique [0002] In the past ten years, with the rapid population expansion and rapid industrial development, energy and environmental issues have gradually become prominent, and the energy crisis and environmental crisis have attracted increasing attention. At present, about 70% of the energy consumed in the world every year is wasted in the form of waste heat. If the waste heat can be effectively recycled, the problem of energy shortage will be greatly alleviated. Thermoelectric materials can directly convert thermal energy into electrical energy. They have the advantages of no transmission parts, small size, no noise, no pollution, and good reliability. They have great application prospects in th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/547C04B35/622C04B35/626
CPCC04B35/547C04B35/622C04B35/62675C04B2235/602C04B2235/666C04B2235/656C04B2235/6562C04B2235/6567
Inventor 李振明鄢永高邵宇鹰刘伟彭鹏唐新峰杨艳芳张琪祁
Owner CHINA ELECTRIC POWER RES INST
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