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Bi2Te3 based nano composite thermoelectric materials

A thermoelectric material and nanocomposite technology, applied in the direction of binary selenium/tellurium compounds, etc., can solve the problem that the thermoelectric performance needs to be further improved, and achieve the effect of improving the thermoelectric potential coefficient or electrical conductivity, and improving the thermoelectric power factor.

Inactive Publication Date: 2006-01-18
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Bi 2 Te 3 Based compounds are currently the best room-temperature thermoelectric materials, but their thermoelectric properties still need to be further improved

Method used

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  • Bi2Te3 based nano composite thermoelectric materials
  • Bi2Te3 based nano composite thermoelectric materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] 1. Raw materials:

[0016] Bi 2 Te 3 Base alloy matrix material: n-type Bi prepared by zone melting directional growth method 2 Te 3 Round ingot (adding I, Br), through the sieve of 100 meshes (154 microns of sieve internal diameter) after crushing;

[0017] Bi 2 Te 3 Based nanostructured powders: binary Bi prepared by solvothermal method 2 Te 3 Nanotubes and nanowires with an average diameter of 70 nanometers and an average length of about 10 micrometers;

[0018] 2. Put Bi 2 Te 3 base alloy matrix powder and Bi 2 Te 3 The nanostructure powder is mixed evenly at a mass percentage of 85:15;

[0019] 3. Put the mixed powder into graphite mould, hot-press molding in a vacuum hot press, hold the pressure at 250°C for 0.5 hour, and the pressure is 50MPa to obtain a block composite material.

Embodiment 2

[0021] 1. Raw materials:

[0022] Bi 2 Te 3 Base alloy matrix material: n-type Bi prepared by zone melting directional growth method 2 Te 3 Round ingot (adding I, Br), through the sieve of 100 meshes (154 microns of sieve internal diameter) after crushing;

[0023] Bi 2 Te 3 Based nanostructured powders: binary Bi prepared by solvothermal method 2 Te 3 Nanotubes and nanowires with an average diameter of 70 nanometers and an average length of about 10 micrometers;

[0024] 2. Put Bi 2 Te 3 base alloy matrix powder and Bi 2 Te 3 The nanostructure powder is mixed uniformly at a mass percentage of 95:5;

[0025] 3. Put the mixed powder into graphite mould, hot-press molding in a vacuum hot press, hold the pressure at 250°C for 0.5 hour, and the pressure is 50MPa to obtain a block composite material.

Embodiment 3

[0027] 1. Raw materials:

[0028] Bi 2 Te 3 Base Alloy Matrix Materials: Binary Bi Deviating from Strict Stoichiometric Ratio by Melting Method 2 Te 3 , pass through a sieve of 100 mesh (154 micron sieve inner diameter) after crushing;

[0029] Bi 2 Te 3 Based nanostructured powders: binary Bi prepared by solvothermal method 2 Te 3 Nanotubes and nanowires with an average diameter of 70 nanometers and an average length of about 10 micrometers;

[0030] 2. Put Bi 2 Te 3 base alloy matrix powder and Bi 2 Te 3 The nanostructure powder is mixed evenly at a mass percentage of 85:15;

[0031] 3. Put the mixed powder into graphite mould, hot-press molding in a vacuum hot press, hold the pressure at 250°C for 0.5 hour, and the pressure is 50MPa to obtain a block composite material.

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Abstract

The invention discloses a high-performance Bi2Te3 based nano composite thermoelectric material which is prepared by adding Bi2Te3 based nanostructured powder into Bi2Te3 based thermoelectric material powder through compression agglomeration recombination. The thermoelectric property of the prepared Bi2Te3 based nano composite thermoelectric material is superior to that of the Bi2Te3 based thermoelectric material with non-recombination nanostructured powder as base.

Description

technical field [0001] The present invention relates to thermoelectric materials. Background technique [0002] A thermoelectric material is a semiconductor material that directly converts electrical energy and thermal energy through the movement of carriers (electrons or holes). When there is a temperature difference between the two ends of the thermoelectric material, the thermoelectric material can convert heat energy into electrical energy output; or conversely, when a current is passed through the thermoelectric material, the thermoelectric material can convert electrical energy into heat energy, and one end releases heat while the other end absorbs heat. Thermoelectric materials have broad application prospects in refrigeration or power generation. Power generation devices made of thermoelectric materials can be used as power sources for deep space spacecraft, field operations, marine lighthouses, and nomadic groups, or for industrial waste h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B19/04
Inventor 赵新兵卢波辉倪华良吉晓华
Owner ZHEJIANG UNIV
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