New method for synthesis of super fast prepared high performance CoSb3-based thermoelectric material by self-propagating combustion

A technology of self-propagating combustion and thermoelectric materials, which is applied in the direction of thermoelectric device node lead-out materials, etc., can solve the problems of limited quality of a single throw, unfavorable commercial application, high requirements for operating equipment, and achieve high efficiency, energy saving, heating and cooling rate, The effect of fast response and simple equipment

Active Publication Date: 2014-07-16
WUHAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the melting annealing method generally takes 7-14 days, and the cycle is too long, which is not conducive to commercial application
Although the melt spinning method greatly shortens the preparation time, the quality of a single spin is limited and the requirements for operating equipment are relatively high.

Method used

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  • New method for synthesis of super fast prepared high performance CoSb3-based thermoelectric material by self-propagating combustion
  • New method for synthesis of super fast prepared high performance CoSb3-based thermoelectric material by self-propagating combustion
  • New method for synthesis of super fast prepared high performance CoSb3-based thermoelectric material by self-propagating combustion

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Experimental program
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Effect test

Embodiment 1

[0035] A rapid preparation of high-performance CoSb 3 A new method based on thermoelectric materials, which includes the following steps:

[0036] 1) Press CO 4 Sb 12 The stoichiometric ratio of each atom is weighed Co powder, Sb powder as raw material, the total mass of raw material powder is 4g, then they are ground and mixed uniformly, and the uniformly mixed powder is pressed into a diameter of 10mm cylindrical block block (4MPa protection press for 5 minutes);

[0037] 2) End-ignite the block obtained in step 1) in an air atmosphere to initiate a self-propagating high-temperature synthesis (SHS, Self-propagating High-temperature Synthesis) reaction and then cool naturally;

[0038] 3) Grind the product obtained in step 2) into powder, perform plasma activated sintering (PAS, Plasma Activated Sintering), put the powder into a 16mm graphite mold for compaction, and then carry out under the conditions of a vacuum of less than 10Pa and a sintering pressure of 40MPa Sinter...

Embodiment 2

[0041] A rapid preparation of high-performance CoSb 3 A new method based on thermoelectric materials, which includes the following steps:

[0042] 1) Press CO 3.5 Ni 0.5 Sb 12 The stoichiometric ratio of each element is weighed Co powder, Sb powder and Ni powder as raw materials, the total mass of raw material powder is 4g, and then they are ground and mixed uniformly, and the uniformly mixed powder is pressed into a cylindrical block with a diameter of 10mm (4MPa hold pressure for 5min);

[0043] 2) End-ignite the block obtained in step 1) in an air atmosphere to initiate a self-propagating reaction (SHS, Self-propagating High-temperature Synthesis) and cool naturally after the reaction is completed;

[0044] 3) Grind the product obtained in step 2) into powder, perform discharge plasma activated sintering (PAS, Plasma Activated Sintering), put the powder into a 16mm graphite mold for compaction, and then under the conditions of a vacuum of less than 10Pa and a sintering ...

Embodiment 3

[0047] A rapid preparation of high-performance CoSb 3 A new method based on thermoelectric materials, which includes the following steps:

[0048] 1) Press CO 3.8 Fe 0.2 Sb 12 The stoichiometric ratio of each atom is weighed Co powder, Sb powder, and Fe powder as raw materials, the total mass of raw material powder is 4g, and then they are ground and mixed evenly, and the uniformly mixed powder is pressed into a cylindrical block with a diameter of 10mm (4MPa hold pressure for 5min);

[0049] 2) End-ignite the block obtained in step 1) in an air atmosphere to initiate a self-propagating reaction (SHS, Self-propagating High-temperature Synthesis) and cool naturally after the reaction is completed;

[0050] 3) Grind the product obtained in step 2) into powder, perform discharge plasma activated sintering (PAS, Plasma Activated Sintering), put the powder into a 16mm graphite mold for compaction, and then under the conditions of a vacuum of less than 10Pa and a sintering press...

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Abstract

The invention relates to a new method for synthesis of a super fast prepared high performance CoSb3-based thermoelectric material by self-propagating combustion. The new method comprises the following steps: 1) weighing Co powder, M powder, Sb powder and Te powder as raw materials according to stoichiometric ratio of each element in the chemical formula Co4-xMxSb12-yTey, wherein 0<= x <=1.0, 0<= y <=1.0, M is Fe or Ni, the raw material powder is mixed and pressed into a bulk blank body; 2) triggering high temperature self-propagating synthesis reaction of the bulk blank body obtained by the step 1), and after the reaction cooling to obtain a single phase CoSb3 compound; 3) grinding the product of the step 2) into powder for discharge plasma activated sintering to obtain the pure single phase high performance CoSb3-based thermoelectric material. The method has the advantages of fast reaction speed, simple process, high efficiency, energy conservation, good repeatability, and the like. The whole preparation process can be completed in 20min, and the bulk thermoelectric figure of merit (ZT) is 0.98 at 875K.

Description

technical field [0001] The invention belongs to the technical field of preparation of new energy materials, in particular to a method for rapidly preparing high-performance CoSb 3 A new approach to thermoelectric materials. Background technique [0002] Today, the natural environment on which human beings depend is deteriorating and fossil energy is rapidly depleting. Therefore, the research, development and application of environmentally friendly and renewable new energy has become a common issue facing the world. In order to alleviate the burden of environmental degradation and energy consumption, many scientists around the world are focusing on finding and developing renewable new energy sources. [0003] Thermoelectric conversion technology is a technology that uses the Seebeck effect and Peltier effect of semiconductor thermoelectric materials to directly convert thermal energy and electrical energy, including thermoelectric power generation and thermoelectric refriger...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/04C22C12/00H01L35/16H01L35/18
Inventor 唐新峰梁涛苏贤礼张强鄢永高
Owner WUHAN UNIV OF TECH
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