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A kind of high-performance pbte-snte alloy base thermoelectric material and preparation method thereof
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A thermoelectric material and alloy-based technology, which is applied in the direction of thermoelectric device junction lead-out material, thermoelectric device manufacturing/processing, etc. The effect of high thermoelectric performance
Active Publication Date: 2020-10-02
TONGJI UNIV
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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.
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[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 invention relates to a high-performance PbTe-SnTe alloy-based thermoelectric material and a preparation method thereof. The chemical formula of the thermoelectric material is Na 0.02 sn x Pb 0.98‑x Te, where x=0~0.04, the specific preparation adopts the method of taking the elemental raw materials Na, Sn, Pb and Te according to the stoichiometric ratio and vacuum packaging, followed by a melting quenching, a secondary heat treatment quenching, and finally hot pressing and sintering That is, worth the target product. Compared with the prior art, the present invention has produced a thermoelectric material with low thermal conductivity and high performance, and explored a method for preparing a thermoelectric material with high density, high mechanical strength and high thermoelectric performance. The thermoelectric material reaches the thermoelectric peak at a temperature of 800K zT ~ 1.8, is a class of thermoelectric materials with great 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 ...
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