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High-performance PbTe-SnTe alloy-based thermoelectric materials and preparation method thereof

A technology based on thermoelectric materials and alloys, which is applied in the direction of thermoelectric device junction lead-out materials, thermoelectric device manufacturing/processing, etc., can solve problems such as difficult to meet thermoelectric materials, and achieve improved material degeneracy, high mechanical strength, and reduced The effect of a small energy difference

Active Publication Date: 2018-09-11
TONGJI UNIV
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  • Abstract
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  • Claims
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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, which is greatly improved compared with the matrix, but it is still difficult to meet some occasions where the thermoelectric figure of merit of thermoelectric materials is extremely high.

Method used

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  • High-performance PbTe-SnTe alloy-based thermoelectric materials and preparation method thereof
  • High-performance PbTe-SnTe alloy-based thermoelectric materials and preparation method thereof
  • High-performance PbTe-SnTe alloy-based thermoelectric materials and preparation method thereof

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preparation example Construction

[0036] In another embodiment of the present invention, a method for preparing a high-performance PbTe-SnTe alloy-based thermoelectric material comprises the following steps:

[0037] (1) Vacuum packaging: According to the stoichiometric ratio of 0.02:x:0.98-x:1, the elemental Na, Sn, Pb and Te are weighed as raw materials and mixed evenly, and then vacuum-packed in a quartz tube;

[0038] (2) Melting reaction quenching: heating the quartz tube to make the raw materials fully react in the molten state, and then quenching to obtain the first ingot;

[0039] (3) heat treatment and quenching: the first ingot is vacuum-packed in another quartz tube, quenched and cooled after heat treatment to obtain the second ingot;

[0040] (4) Pressurized sintering: Grinding the second ingot into powder, placing it in a graphite mold, sintering under vacuum and high temperature hot pressing, and then cooling to obtain a bulk material, which is the high-performance PbTe-SnTe alloy-based thermoelect...

Embodiment 1

[0048] A high-performance PbTe-SnTe alloy-based thermoelectric material with the chemical formula Na 0.02 sn x Pb 0.98-x Te, where x=0-0.04. In the present embodiment, by getting x=0, 0.01, 0.02, 0.03, and 0.04 (when x=0, the chemical formula is Na 0.02 Pb 0.98 Te, x=0.01, 0.02, 0.03, 0.04 is energy band control and improves material degeneracy), according to the following preparation method, Na 0.02 sn x Pb 0.98-x Te bulk material:

[0049] (1) According to the value of different x, it becomes Na according to the composition 0.02 sn x Pb 0.98-x Stoichiometric ratio of Te (x=0-0.04) Weigh elemental raw materials sodium Na, 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.

[0050] (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, a...

Embodiment 2

[0061] 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 present invention relates to high-performance PbTe-SnTe alloy-based thermoelectric materials and a preparation method thereof. The chemical formula of thermoelectric materials is Na0.02SnxPb0.98-xTe, wherein x is equal to 0-0.04. When preparation is concretely performed, simple substance materials Na, Sn, Pb and Te are weighted according to a stoichiometric ratio, and are subjected to vacuum packaging, primary fusion quenching, secondary heat-treatment quenching and hot pressed sintering to obtain a target product. Compared to the prior art, the thermoelectric materials with low thermal conductance and high performances are prepared in the invention, a method for preparing thermoelectric materials with high density, high mechanical strength and a high thermoelectric property is explored, and the thermoelectric materials can reach a thermoelectricity peak value zT~1.8 at the temperature of 800K, and are first-class thermoelectric materials having large potential.

Description

technical field [0001] The invention relates to the technical field of new energy materials, in particular to a high-performance PbTe-SnTe alloy-based thermoelectric material and a preparation method thereof. Background technique [0002] Energy crisis and environmental pollution have become two major problems that need to be solved urgently in the world. Energy conservation and efficient use of energy occupy a prominent position in my country's medium and long-term energy development strategy. Thermoelectric energy conversion technology is a technology that drives the directional movement of electrons inside materials through temperature differences to achieve direct conversion of thermal energy and electrical energy. The working medium of this technology is electrons. Compared with traditional heat engines, it has outstanding advantages such as no transmission parts, no noise, all solid state, zero emissions and zero maintenance requirements. It is considered as a kind of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L35/16H01L35/34H10N10/852H10N10/01
CPCH10N10/852H10N10/01
Inventor 裴艳中李文吴怡萱
Owner TONGJI UNIV
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