Sn-S-based thermoelectric compound and preparation method thereof

A compound and thermoelectric technology, which is applied in the manufacture/processing of thermoelectric devices, and the material of thermoelectric device junction leads, etc., can solve problems that have not been reported by anyone, and achieve the effects of less time-consuming, fine and uniform structure, and short process flow

Active Publication Date: 2013-01-09
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are few systematic reports on the thermoelectric properties of SnS bulk
In summary, Sn-S is a potential thermoelectric material, but its thermoelectric figure of merit, and its preparation by mechanical alloying and spark plasma sintering have not been reported yet.

Method used

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  • Sn-S-based thermoelectric compound and preparation method thereof
  • Sn-S-based thermoelectric compound and preparation method thereof
  • Sn-S-based thermoelectric compound and preparation method thereof

Examples

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preparation example Construction

[0040] Specifically, the preparation method of the Sn-S based thermoelectric compound according to the embodiment of the present invention includes the following steps:

[0041] a) Provide initial raw materials, the initial raw materials contain Sn simple substance, S simple substance and Ag, Cu or In simple substance, the molar ratio of Sn simple substance, S simple substance and Ag, Cu or In simple substance is 1:0.8~2:0 ~1;

[0042] b) Dry grinding the initial raw material in a protective gas atmosphere;

[0043] c) adding the dry-milled material to an organic liquid medium for wet milling;

[0044] d) taking out and drying the wet-milled powder to obtain dry powder;

[0045] e) vacuum sintering the dry powder after compaction to obtain a Sn—S based thermoelectric compound.

[0046] Therefore, according to the method for preparing Sn—S-based thermoelectric compounds according to the embodiment of the present invention, the initial raw materials used are non-toxic and non...

Embodiment 1

[0060] Using tin (Sn) powder and sulfur (S) powder as the initial raw materials, weigh a total of 20g of powder according to the SnS chemical formula, put it into a stainless steel ball mill tank (volume 250mL), and add stainless steel grinding balls (grinding balls) of different diameters The weight ratio to powder is about 20:1). The ball mill tank was filled with high-purity argon as a protective gas, and dry-milled on a planetary ball mill (QM-2, Nanjing University Instrument Factory) at a speed of 450r / min for 15h. After dry grinding, absolute ethanol was added as the medium, and wet grinding was carried out at a speed of 350r / min for 90 min. The powder after wet grinding was taken out and dried, and the intermediate compound powder was formed through mechanical alloying (MA) reaction of dry grinding and wet grinding.

[0061] The intermediate compound powders were sintered in a spark plasma sintering furnace (SPS) at temperatures of 823K and 973K, respectively, to obtain...

Embodiment 2

[0064] Using tin (Sn) powder and sulfur (S) powder as initial raw materials, a total of 20 g of powder was weighed according to the chemical formula of SnS, and the intermediate compound powder was prepared according to the method described in Example 1.

[0065] The intermediate compound powder is sintered in a spark plasma sintering furnace at temperatures of 823K, 853K, 893K and 973K respectively to obtain a Sn-S-based thermoelectric compound block.

[0066] image 3 Scanning electron microscope (SEM) photos showing the cross-section of Sn-S-based thermoelectric compound bulk samples sintered by SPS at different temperatures, Figure 4-Figure 7 Respectively represent the electrical conductivity, Seebeck coefficient, thermal conductivity, and ZT value of Sn-S-based thermoelectric compound bulk samples sintered by SPS at different temperatures as a function of temperature, where a represents the sintering temperature of 823K, and b represents the sintering temperature is 853...

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Abstract

The invention discloses a Sn-S-based thermoelectric compound and a preparation method thereof. The preparation method comprises the following steps of: (a) providing an initial raw material, wherein the initial raw material consists of a Sn elementary substance, an S elementary substance and an Ag, Cu or In elementary substance, and the molar ratio of the Sn elementary substance to the S elementary substance to the Ag, Cu or In elementary substance is 1: (0.8-2): (0-1); (b) carrying out dry grinding on the initial raw material in a protective gas atmosphere; (c) adding the material subjected to dry grinding into an organic liquid medium and carrying out wet grinding; (d) taking the powder subjected to wet grinding and drying the powder to obtain dried powder; and (e) compacting the dried powder and carrying out vacuum sintering on the compacted powder to obtain the Sn-S-based thermoelectric compound. According to the preparation method disclosed by the invention, the adopted initial raw material is a nontoxic pollution-free raw material and is low in cost; the preparation method is short in process flow, little in time consumption, high in efficiency and low in energy consumption; and the obtained Sn-S-based thermoelectric compound is fine and uniform in tissues, good in thermoelectric property and suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to the technical field of new energy materials, and more specifically, the invention relates to a Sn-S-based thermoelectric compound and a preparation method thereof. Background technique [0002] Thermoelectric material is a functional material that utilizes the movement of carriers inside a solid to achieve direct mutual conversion of thermal energy and electrical energy. The performance of thermoelectric materials is characterized by the thermoelectric figure of merit ZT: ZT=α 2 σT / κ. Among them, α is the thermoelectric potential coefficient of the material (ie Seebeck coefficient), σ is the electrical conductivity, κ is the thermal conductivity, and T is the absolute temperature. At present, traditional thermoelectric materials that are more mature in research include: Bi 2 Te 3 And its solid solution alloy; PbTe and its alloys, skutterudite structure used in the middle temperature zone; SiGe alloy, chelate structure used ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L35/34H01L35/16
Inventor 李敬锋谭晴
Owner TSINGHUA UNIV
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