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Nano SiC/P-type silicon germanium alloy-based thermoelectric composite material and preparation method thereof

A nano-silicon carbide and silicon germanium alloy technology, which is applied in the direction of thermoelectric device junction lead-out material, thermoelectric device manufacturing/processing, etc. Simple preparation method and high utilization rate of raw materials

Active Publication Date: 2017-09-01
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, G. Chen prepared silicon-germanium alloys with nanostructures by ball milling, which greatly improved the thermoelectric properties of silicon-germanium alloys (G.Joshi, H.Lee, Y.Lan, X.Wang, G.Zhu, D.Wang, R.W. Gould, D.C. Cuff, M. Tang, M.S. Dresselhaus, G. Chen, Z. Ren, Nano Lett. 2008, 8, 4670. X. Wang, H. Lee, Y. C. Lan, G. Zhu, G. Joshi, D. Z. Wang, J.Yang, A.J.Muto, M.Y.Tang, J.Klatsky, S.Song, M.S.Dresselhaus, G.Chen, Z.F.Ren, Appl.Phys.Lett.2008, 93, 193121) but the material crystals prepared by this method The grain size is less than 50nm, and it is prone to problems such as grain growth and performance degradation during use

Method used

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  • Nano SiC/P-type silicon germanium alloy-based thermoelectric composite material and preparation method thereof
  • Nano SiC/P-type silicon germanium alloy-based thermoelectric composite material and preparation method thereof
  • Nano SiC/P-type silicon germanium alloy-based thermoelectric composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Example 1: P-type Si 80 Ge 20 B 1 +1.5vol% SiC nanocomposite thermoelectric material

[0039] First, according to Si 80 Ge 20 B 1 The stoichiometric ratio of Si, Ge, and B particles with a total amount of 10g was weighed as raw materials, and the raw materials were packaged in quartz tubes in a glove box, and Si was obtained by induction melting. 80 Ge 20 B 1 solid solution (melting temperature is 1400°C, melting time is 8 minutes), and crushed with a mortar to obtain Si 80 Ge 20 B 1 powder. Second, according to Si 80 Ge 20 B 1 1.5% of the powder volume fraction weighs silicon carbide particles with an average particle size of 100nm and Si 80 Ge 20 B 1 Powder mix. Then put the above-mentioned raw materials into a zirconia ball mill jar (volume is 80ml), and add grinding balls with a diameter of 10mm (the ratio of ball to material is 15:1). (Fritsch-Pulverisette-7) ball milling for 5 hours at a rotational speed of 600 rpm to obtain nanometer silicon car...

Embodiment 2

[0041] Example 2: P-type Si 80 Ge 20 B 0.6 +0.3vol% SiC nanocomposite thermoelectric material

[0042] First, according to Si 80 Ge 20 B 0.6 The stoichiometric ratio of Si, Ge, and B particles with a total amount of 10g was weighed as raw materials, and the raw materials were packaged in quartz tubes in a glove box, and Si was obtained by induction melting. 80 Ge 20 B 0.6 Si 80 Ge 20 B 0.6 powder. Second, according to Si 80 Ge 20 B 0.6 0.3% of the powder volume fraction weighs silicon carbide particles with an average particle size of 50nm and Si 80 Ge 20 B 0.6 Powder mix. Then put the above-mentioned raw materials into a zirconia ball mill jar (volume is 80ml), and add grinding balls with a diameter of 10mm (the ratio of ball to material is 15:1). (Fritsch-Pulverisette-7) ball milling 4h, rotating speed is 500rpm, obtains Si 80 Ge 20 B 0.6 +0.3vol% SiC nanocomposite thermoelectric material powder. Finally, put the powder into a graphite mold, and then ca...

Embodiment 3

[0044] Example 3: P-type Si 80 Ge 20 B 0.6 +0.5vol% SiC nanocomposite thermoelectric material

[0045] First, according to Si 80 Ge 20 B 0.6 The stoichiometric ratio of Si, Ge, and B particles with a total amount of 10g was weighed as raw materials, and the raw materials were packaged in quartz tubes in a glove box, and Si was obtained by induction melting. 80 Ge 20 B 0.6 Si 80 Ge 20 B 0.6 powder. Second, according to Si 80 Ge 20 B 0.6 0.5% of the powder volume fraction weighs silicon carbide particles with an average particle size of 50nm and Si 80 Ge 20 B 0.6Powder mix. Then put the above-mentioned raw materials into a zirconia ball mill jar (volume is 80ml), and add grinding balls with a diameter of 10mm (the ratio of ball to material is 15:1). (Fritsch-Pulverisette-7) ball milling 4h, rotating speed is 500rpm, obtains Si 80 Ge 20 B 0.6 +0.5vol% SiC nanocomposite thermoelectric material powder. Finally, put the powder into a graphite mold, and then car...

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Abstract

The invention relates to a Nano SiC / P-type silicon germanium alloy-based thermoelectric composite material and a preparation method thereof. The thermoelectric composite material is composed of P-type silicon germanium alloy and Nano SiC particles uniformly dispersed on the grain boundary and / or inside the grains of the P-type silicon germanium alloy. The chemical formula of the P-type silicon germanium alloy is Si(80)Ge(20)B(x), wherein 0.2<=x<=2.0. The volume percentage of the Nano SiC particles is 0.3-2.0% that of the P-type silicon germanium alloy. The Nano SiC particles and the P-type silicon germanium alloy are composited to prepare the thermoelectric composite material. The lattice thermal conductivity of the material is reduced significantly on the premise that the power factor does not change much. The thermoelectric property of the material in the whole range of temperature is improved. In addition, the preparation method provided by the invention is simple and fast, has high utilization ratio of raw materials, and has a good industrialization prospect.

Description

technical field [0001] The invention relates to a thermoelectric composite material and a preparation method thereof, in particular to a nano-silicon carbide / P-type silicon-germanium alloy-based thermoelectric composite material and a preparation method thereof, belonging to the field of thermoelectric materials. Background technique [0002] As an important part of deep space probes, the study of space energy systems is of great significance. The radioisotope thermoelectric generator has become the preferred energy source for deep space exploration due to its simple structure, no mechanical transmission, self-supplied energy without care, etc. It is a power generation device that uses the Seebeck effect of materials to directly convert radioisotope decay heat into electrical energy. The core of this conversion is thermoelectric materials. [0003] The performance of thermoelectric materials mainly depends on the material's dimensionless thermoelectric figure of merit ZT, w...

Claims

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Application Information

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IPC IPC(8): H01L35/14H01L35/34
CPCH10N10/851H10N10/01
Inventor 陈立东杨小燕吴洁华任都迪张天松
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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