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High-performance Cu2Se block thermoelectric material with nanopore structure and rapid preparation method of high-performance Cu2Se block thermoelectric material

A technology of nanoporous structure and thermoelectric material, which is applied in the direction of thermoelectric device node lead-out material, thermoelectric device manufacturing/processing, binary selenium/tellurium compound, etc. The problem of grain growth is easy to achieve the effect of short preparation time, reduced thermal conductivity and simple process.

Active Publication Date: 2014-07-09
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the melting point of Se is only 221°C, long-term high-temperature treatment makes it difficult to control the composition of the material and the grains tend to grow, which is detrimental to the thermoelectric properties of the material.

Method used

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  • High-performance Cu2Se block thermoelectric material with nanopore structure and rapid preparation method of high-performance Cu2Se block thermoelectric material
  • High-performance Cu2Se block thermoelectric material with nanopore structure and rapid preparation method of high-performance Cu2Se block thermoelectric material
  • High-performance Cu2Se block thermoelectric material with nanopore structure and rapid preparation method of high-performance Cu2Se block thermoelectric material

Examples

Experimental program
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Effect test

Embodiment 1

[0049] A high-performance Cu with nanoporous structure 2 The rapid preparation method of Se thermoelectric material is characterized in that it comprises the following steps:

[0050] 1) With Cu powder, Se powder is raw material, weighs that the mol ratio of Cu powder and Se powder is 2:1, and weighing total amount is 15g, and raw material is mixed uniformly in agate mortar, obtains mixed powder as Reactant, reactant is put into steel mould, adopts the pressure of 10 MPa to be 12 mm cylindrical blocks in diameter on tablet press;

[0051] 2) Vacuum-seal the reactant in a quartz glass tube (the inner diameter of the quartz glass tube is 17 mm, the outer diameter is 20 mm), and heat the bottom end of the quartz glass tube on a heat source at 300°C until the self-propagating reaction is initiated and stopped Heating, the reaction spreads from the bottom to the top in the form of combustion waves, and naturally cools down after the completion of the self-propagating reaction to o...

Embodiment 2

[0062] The same process as in Example 1 was adopted, except that the sintering temperature was 500 °C, the sintering pressure was 50 MPa, the heating rate was 50 K / min, and the holding time was 3 min.

[0063] Table 2 The nominal composition and actual composition of EPMA of the SHS product and the product sintered by PAS in Example 2

[0064] sample nominal composition The actual composition of EPMA SHS product Cu 2 Se Cu 2.004 Se Product after PAS sintering Cu 2 Se Cu 2.02 Se

Embodiment 3

[0066] The same process as in Example 1 was adopted, except that the sintering temperature was 600 °C, the sintering pressure was 30 MPa, the heating rate was 100 K / min, and the holding time was 5 min.

[0067] Table 3 The nominal composition and the actual composition of EPMA of the SHS product and the product sintered by PAS in Example 3

[0068] sample nominal composition The actual composition of EPMA SHS product Cu 2 Se Cu 2.004 Se Product after PAS sintering Cu 2 Se Cu 2.06 Se

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Abstract

The invention provides a high-performance Cu2Se block thermoelectric material with a nanopore structure and a rapid preparation method of the high-performance Cu2Se block thermoelectric material. The rapid preparation method includes specific steps of 1) preparing Cu powder and Se powder as raw materials according to a stoichiometric ratio of 2 to 1, and subsequently evenly mixing the Cu powder and the Se powder to obtain a reactant; 2) subjecting the reactant to a self-propagating reaction by means of a direct initiation or constant temperature initiation manner, and natural cooling after completion of reaction; 3) performing plasma activated sintering to obtain the high-performance Cu2Se block thermoelectric material with the nanopore structure. By means of self-propagating combustion synthesis combined with the plasma activated sintering process, the high-performance Cu2Se block thermoelectric material can be prepared within 20 minutes, a thermoelectric property optimum value of the high-performance Cu2Se block thermoelectric material reaches 1.9 at the temperature of 727 DEG C, the preparation time is short, the process is simple, the composition control is accuracy, the thermoelectric property of the material is high, the material is suitable for large-scale production, and a broad commercialization application prospect is achieved.

Description

technical field [0001] The invention belongs to the field of new energy materials, in particular to a high-performance Cu with nanopore structure 2 Se bulk thermoelectric material and its rapid preparation method. Background technique [0002] About 70% of the energy consumed in the world every year is wasted in the form of waste heat. If the waste heat can be effectively recycled, the problem of energy shortage will be greatly alleviated. Thermoelectric materials can directly convert thermal energy into electrical energy. They have the advantages of no transmission parts, small size, no noise, no pollution, and good reliability. They have great application prospects in the recycling of automobile waste heat and industrial waste heat power generation. The conversion efficiency of thermoelectric materials is determined by the dimensionless thermoelectric figure of merit ZT ( ZT = a 2 s T / k ,in a is the Seebeck coefficient, s is the conductivity, k is the therma...

Claims

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Application Information

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IPC IPC(8): B22F3/11C01B19/04H01L35/34H01L35/16
Inventor 唐新峰付帆任广坤刘雅梅张清杰
Owner WUHAN UNIV OF TECH
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