High-performance PbTe-based solid solution thermalelectric material and preparation method thereof

A thermoelectric material and solid solution technology, applied in the directions of metal selenide/telluride, binary selenium/tellurium compound, etc., can solve problems such as difficulty in meeting thermoelectric materials, and achieve reduced lattice thermal conductivity, high power factor, high mechanical the effect of strength

Active Publication Date: 2018-09-11
TONGJI UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

The PbTe-based thermoelectric material prepared in this patent controls the Ga doping amount to Pb 0.97 Ga 0.03 The thermoelectric figure of merit of Te can reach 1.32 at 823K, whic

Method used

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  • High-performance PbTe-based solid solution thermalelectric material and preparation method thereof
  • High-performance PbTe-based solid solution thermalelectric material and preparation method thereof
  • High-performance PbTe-based solid solution thermalelectric material and preparation method thereof

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preparation example Construction

[0037] In one embodiment of the present invention, a new preparation method different from conventional high-performance PbTe-based solid solution thermoelectric materials includes the following steps:

[0038] (1) Vacuum packaging:

[0039] According to the stoichiometric ratio, the elemental raw materials Na, Eu, Sn, Pb and Te were weighed, mixed evenly and vacuum-packed in a quartz tube;

[0040] (2) Melting reaction quenching:

[0041] Heating the quartz tube to make the raw materials fully react in the molten state, and then quenching to obtain the first ingot;

[0042] (3) Heat treatment quenching:

[0043] Vacuum-encapsulating the first ingot in another quartz tube, quenching and cooling after heat treatment, to obtain the second ingot;

[0044] (4) Pressure sintering:

[0045] Grinding the second ingot into powder, placing it in a graphite mold, sintering under vacuum and high temperature hot pressing, and cooling to obtain the target product.

[0046] In a prefer...

Embodiment 1

[0052] A high-performance PbTe-based solid solution thermoelectric material with the chemical formula Na x Eu 0.03 sn 0.02 Pb 0.95-x Te, where x=0.01-0.05. In this example, by taking x=0.01, 0.015, 0.02, 0.025, 0.03, 0.035, 0.04, 0.045 and 0.05, according to the following preparation method, Na x Eu 0.03 sn 0.02 Pb 0.95-x Te bulk material:

[0053] (1) According to the value of different x, it becomes Na according to the composition x Eu 0.03 sn 0.02 Pb 0.95-x The stoichiometric ratio of Te (x=0.01~0.05) Weigh the elemental raw materials sodium Na, europium Eu, tin Sn, lead Pb and tellurium Te with a purity greater than 99.9%, place the raw materials in a quartz tube, and seal the quartz tube under vacuum .

[0054] (2) Suspend the quartz tube containing the raw materials in a high-temperature muffle furnace, slowly raise the temperature to 1200-1400K at a rate of 150-300K / h, keep it warm for 6-10 hours, and then rapidly quench and cool to obtain the first ingot; t...

Embodiment 2

[0067] Compared with Example 1, most of them are the same, except that in step (2) of the present example: the temperature is slowly raised to 1300K at a rate of 150K / h, and the temperature is kept at 1300K for 10h.

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Abstract

The invention relates to a high-performance PbTe-based solid solution thermalelectric material and a preparation method thereof. The chemical formula of the thermalelectric material is NaxEu0.03Sn0.02Pb0.95-xTe, wherein x is equal to 0.01-0.05, during preparation, simple substance raw materials Na, Eu, Sn, Pb and Te are weighed according to the stoichiometric proportion and subjected to vacuum encapsulation, then primary melt quenching and secondary heat treatment quenching are sequentially conducted, and finally, a target product is obtained through a hot pressed sintering method. Compared with the prior art, the low-thermal conductivity high-performance thermalelectric material is prepared, the method for preparing the thermalelectric material with high density, high mechanical strengthand high thermalelectric property is explored, and the thermalelectric peak value zT of the thermalelectric material at the temperature of 850 K reaches 2.6, so that the thermalelectric material is ahigh-performance thermalelectric material with a tremendous potential.

Description

technical field [0001] The invention relates to the technical field of new energy materials, in particular to a high-performance PbTe-based solid solution thermoelectric material and a preparation method thereof. Background technique [0002] With the rapid development of the global economy, the contradiction that the economy is constrained by resources and the environment is approaching the critical point. Energy conservation and environmental protection have become two important development strategies in the world. Thermoelectric materials can realize the direct conversion of heat and electricity by using the thermoelectric effect. They have the characteristics of small size, light weight, no noise and no pollution. They can realize precise temperature control, fast response speed and long service life of devices. It is a clean, carbon-free and sustainable energy technology, so it has played an important role in key fields such as waste heat recovery and aerospace, and ha...

Claims

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Application Information

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IPC IPC(8): C01B19/04
CPCC01B19/007C01P2002/72
Inventor 裴艳中李文吴怡萱
Owner TONGJI UNIV
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