p-bi 0.5 sb 1.5 te 3 Preparation method of base nanoporous thermoelectric composite material

A bi0.5sb1.5te3, nano-porous technology, applied in the field of thermoelectric composite material preparation, can solve the problems of high cost, low efficiency, and low conversion efficiency of thermoelectric materials, and achieve the effect of low cost, simple operation and low cost

Active Publication Date: 2016-08-24
TIANJIN UNIV
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Problems solved by technology

However, despite the wide application potential of thermoelectric materials and devices, due to the low conversion efficiency and high cost of traditional thermoelectric materials, their dimensionless thermoelectric figure of merit ZT has been hovering around 1. The conversion efficiency is less than 10%, which is far lower than that of traditional physical and chemical power sources, so the bottleneck of thermoelectric materials is an important factor restricting the further commercialization of thermoelectric devices
[0004] For many years, scientists have been committed to the design of new thermoelectric materials and the development of advanced preparation processes. According to the calculation formula of ZT, to improve the material's dimensionless thermoelectric figure of merit ZT needs to reduce the material's thermal conductivity and increase the Seebeck coefficient and electrical conductivity. However, in conventional In bulk thermoelectric materials, these two aspects cannot be achieved at the same time, and they are mutually restrictive

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  • p-bi <sub>0.5</sub> sb <sub>1.5</sub> te <sub>3</sub> Preparation method of base nanoporous thermoelectric composite material
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  • p-bi <sub>0.5</sub> sb <sub>1.5</sub> te <sub>3</sub> Preparation method of base nanoporous thermoelectric composite material

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preparation example Construction

[0016] The p-type Bi of the present invention 0.5 Sb 1.5 Te 3 The preparation method of base nanoporous thermoelectric composite material comprises the following steps:

[0017] 1) Spread 3-5μm Sn solder paste on the p-type thermoelectric material Bi 0.5 Sb 1.5 Te 3 Put it on the heating platform, and carry out the liquid phase wetting reaction in the protective atmosphere of Ar gas at 260°C, the reaction time is 5-10min, so as to form a layer of Sn solder paste and the product SnTe-SbSn Uniform mixed layer; react under Ar gas atmosphere to prevent tin oxidation, the thickness of the mixed layer reaction product SnTe-SbSn and the microstructure of the product can be adjusted through the reaction time and temperature;

[0018] 2), the thermoelectric material Bi after the reaction in step 1) 0.5 Sb 1.5 Te 3 The reaction pair composed of Sn solder paste was placed in a beaker filled with a 10% nitric acid solution, and then ultrasonically oscillated in a water bath enviro...

Embodiment 1

[0021] 1. Spread the 3-5μm Sn solder paste on the p-type thermoelectric material Bi with a size of 5×5×1mm 0.5 Sb 1.5 Te 3 above, and put it on the heating platform, at 260 ℃, carry out the liquid phase wetting reaction, the reaction time is 5min, so as to form a layer of uniform mixed layer of Sn material and product SnTe-SbSn, such as figure 1 shown.

[0022] 2. The fully reacted thermoelectric material Bi in step 1 0.5 Sb 1.5 Te 3 For the reaction with solder Sn, place it in a beaker filled with 10% nitric acid solution, and perform ultrasonic vibration, where the solution temperature is 80°C, and the pickling time is 30min. Among them, the solder Sn and the Sn included in the formation will be corroded by acid, so as to form uniformly distributed pores with a size of 200-500nm.

[0023] 3. Wash repeatedly with distilled water to obtain p-type Bi in step 2 0.5 Sb 1.5 Te 3 / Porous SnTe-SbSn composite thermoelectric material, because the Sn material reacts in the liq...

Embodiment 2

[0025]1. Spread the 3-5μm Sn solder paste on the p-type thermoelectric material Bi with a size of 5×5×1mm 0.5 Sb 1.5 Te 3 Above, put it on the heating platform, and carry out the liquid phase wetting reaction at 260 °C, the reaction time is 5min, so as to form a layer of uniform mixed layer of Sn material and product SnTe-SbSn, such as image 3 shown.

[0026] 2. The fully reacted thermoelectric material Bi in step 1 0.5 Sb 1.5 Te 3 For the reaction with Sn solder paste, place it in a beaker filled with 10% nitric acid solution, and perform ultrasonic vibration, wherein the solution temperature is 80°C, and the pickling time is 30min. Among them, the solder Sn and the Sn included in the formation will be corroded by acid, so as to form uniformly distributed pores with a size of 200-500 μm.

[0027] 3. Wash repeatedly with distilled water to obtain p-type Bi in step 2 0.5 Sb 1.5 Te 3 / Porous SnTe-SbSn composite thermoelectric material, because the Sn material reacts in...

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Abstract

The invention provides a method for preparing a p-type Bi0.5Sb1.5Te3-based nanoporous thermoelectric composite material. The method steps: spread 3-5 μm Sn solder paste on the p-type thermoelectric material Bi0.5Sb1.5Te3, and place it on On the heating table, at a temperature of 260°C, a liquid phase wetting reaction is carried out in a protective atmosphere of Ar gas to form a uniform mixed layer of Sn solder paste and the product SnTe-SbSn; the reaction is carried out in an Ar gas atmosphere to prevent tin oxidation. The reaction time and temperature can control the thickness of the mixed layer reaction product SnTe-SbSn and the microstructure of the product; the reaction pair composed of the above-mentioned thermoelectric material Bi0.5Sb1.5Te3 and Sn solder paste is subjected to ultrasonic vibration and pickling , a p-type Bi0.5Sb1.5Te3 / porous SnTe‑SbSn composite thermoelectric material with uniform hole distribution was obtained. The beneficial effect is that this preparation method can obtain a SnTe-SbSn layer with uniform 200-500μm nanopores, the thickness of the reaction layer is increased to 40μm, the reaction rate is 4.05μm / min, the cost is low, and the composition is accurate and controllable.

Description

technical field [0001] The invention relates to the preparation of thermoelectric composite materials, using a p-type Bi in situ liquid phase wetting reaction plus acidification treatment 0.5 Sb 1.5 Te 3 Preparation method of nanoporous thermoelectric composite material. Background technique [0002] Thermoelectric materials refer to semiconductor functional materials that realize the mutual conversion between thermal energy and electrical energy through the transport and interaction of carriers and phonons in solid materials. Compared with other traditional energy technologies, thermoelectric power generation technology has the advantages of simple structure, no noise, no pollution, no transmission parts and long service life, so thermoelectric materials have been used in the automotive industry, metallurgical industry, information technology, aerospace and instrumentation Instruments and other fields have been widely used. For example, the use of thermoelectric technolo...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): H01L35/34H01L35/16B82Y30/00B82Y40/00H10N10/01H10N10/852
Inventor徐连勇任新宇张浩韩永典荆洪阳
OwnerTIANJIN UNIV