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Ultra-rapid preparation method of Cu2Se bulk thermoelectric material

A thermoelectric material and ultra-fast technology, applied in the field of ultra-fast preparation of Cu2Se bulk thermoelectric materials, can solve the problems of difficult composition control, Se volatilization, etc., and achieve the effects of short preparation time, reduced energy consumption, and simple process

Active Publication Date: 2018-03-13
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, an unsolvable problem brought about by high temperature treatment is the volatilization of Se, which makes it difficult to control the composition.

Method used

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  • Ultra-rapid preparation method of Cu2Se bulk thermoelectric material
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  • Ultra-rapid preparation method of Cu2Se bulk thermoelectric material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] An ultrafast preparation of Cu 2 The method of Se block thermoelectric material, concrete steps are as follows:

[0025] 1) Take Cu powder and Se powder as raw materials, weigh Cu powder and Se powder according to the molar ratio of 2:1, there are 5 groups in total, each group is 5g, and they are respectively numbered as a, b, c, d, e;

[0026] 2) Place each group of raw materials in an agate mortar and grind for 20 minutes to obtain uniform mixed powder (mixed raw materials);

[0027] 3) Put the mixed powders (a, b, c, d, e) into Φ16mm graphite molds for compaction, and then put the graphite molds into the plasma activation sintering (PAS) equipment for activation for 30s (plasma activation stage ) to prepare products a, b, c, d, e (Cu 2 Se bulk thermoelectric material); wherein the parameters of each sample in the plasma activation stage are set as follows:

[0028] a: Pulse current 60A, pulse voltage 2V, ON / OFF pulse time 30ms, axial pressure 50MPa, vacuum conditi...

Embodiment 2

[0035] An ultrafast preparation of Cu 2 The method of Se bulk thermoelectric material (ON / OFF pulse time is 50ms, 100ms and 200ms respectively), the specific steps are as follows:

[0036] 1) Take Cu powder and Se powder as raw materials, weigh Cu powder and Se powder according to the molar ratio of 2:1, there are 3 groups in total, each group is 5g, and they are numbered A1, B1, and C1 respectively;

[0037] 2) Put each raw material in an agate mortar and grind for 20 minutes to obtain a uniform mixed powder (mixed raw material);

[0038] 3) Put the mixed powders (A1, B1, C1) into Φ16mm graphite molds for compaction, and then put the graphite molds into the plasma activation sintering (PAS) equipment to activate for 30s (plasma activation stage) to prepare the product A1, B1, C1 (Cu 2 Se bulk thermoelectric material); wherein the control parameters in the plasma activation stage are set as follows: the vacuum condition below 10Pa, the axial pressure is 50MPa, the pulse curr...

Embodiment 3

[0041] An ultrafast preparation of Cu 2The method of Se bulk thermoelectric material (the atmosphere is respectively N 2 and Ar), the specific steps are as follows:

[0042] 1) Take Cu powder and Se powder as raw materials, weigh Cu powder and Se powder according to the molar ratio of 2:1, there are 2 groups in total, each group is 5g, and they are numbered A2 and B2 respectively;

[0043] 2) Put each raw material in an agate mortar and grind for 20 minutes to obtain a uniform mixed powder (mixed raw material);

[0044] 3) Put the mixed powders (A2, B2) into Φ16mm graphite molds for compaction, and then put the graphite molds into plasma activation sintering (PAS) equipment for activation for 30s (plasma activation stage) to prepare products A2, B2(Cu 2 Se bulk thermoelectric material); wherein the control parameters in the plasma activation stage are set as follows: the axial pressure is 50MPa, the pulse current is 80A, the pulse voltage is 2V, and the ON / OFF pulse time is...

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Abstract

The present invention discloses for the first time an ultra-rapid preparation method for a Cu2Se bulk thermoelectric material. The method takes Cu powder and Se powder as raw materials and comprises the steps of firstly uniformly mixing the raw materials, then loading the obtained mixed raw materials into a graphite mold and placing the graphite mold in plasma activation sintering equipment, so asto prepare a single-phase and dense Cu2Se bulk thermoelectric material in a plasma activation stage by a plasma activation sintering process, and to complete the reaction synthesis and densificationprocess of the Cu2Se compound in one step. The technology involved in the method is extremely simple and the preparation time is extremely short. The prepared Cu2Se bulk thermoelectric material has superior performance and has a ZT larger than 1.2 in a range of 773 to 873K, and thus a good foundation is laid for large-scale application and preparation of Cu2Se compounds.

Description

technical field [0001] The invention belongs to the technical field of thermoelectric material preparation, in particular to an ultra-fast preparation of Cu 2 A method for Se bulk thermoelectric materials. Background technique [0002] Thermoelectric conversion technology uses thermoelectric materials to directly convert heat energy and electric energy. It has the characteristics of small system size, high reliability, no emission of pollutants, wide applicable temperature range, and effective use of low-density energy. It is used in industrial waste heat and automobile exhaust waste heat. It has a wide range of applications in the fields of recycling, high-precision temperature control and special power supply technology. The conversion efficiency of thermoelectric materials is determined by the dimensionless thermoelectric figure of merit ZT (ZT=α 2 σT / κ, where α is the Seebeck coefficient, σ is the electrical conductivity, κ is the thermal conductivity, and T is the abs...

Claims

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Application Information

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IPC IPC(8): C04B35/547C04B35/65
CPCC04B35/547C04B35/65C04B2235/602C04B2235/666C04B2235/96
Inventor 唐新峰杨东旺唐贤贤苏贤礼鄢永高
Owner WUHAN UNIV OF TECH
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