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Zinc antimony based porous p-type thermoelectric material and preparation method thereof

A technology of porous structure and thermoelectric material, which is applied in the field of porous structure p-type zinc-antimony based thermoelectric material and its preparation, semiconductor thermoelectric power generation and refrigeration materials, and achieves the effect of shortening the preparation period and shortening the preparation period.

Inactive Publication Date: 2010-10-13
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current preparation of such compounds usually requires long-term high-temperature annealing treatment, and the annealing time is as long as tens or even hundreds of hours.

Method used

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  • Zinc antimony based porous p-type thermoelectric material and preparation method thereof
  • Zinc antimony based porous p-type thermoelectric material and preparation method thereof
  • Zinc antimony based porous p-type thermoelectric material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Example 1: Porous structure p-type YbZn 2 Sb 2 Material

[0038] (1) According to the nominal composition, it is YbZn 2 Sb 2 The stoichiometric ratio of high-purity Yb block (purity 99.995%) 2.8451g, Zn powder (purity 99.99%) 2.1507g and Sb powder (purity 99.999%) 4.0044g are accurately weighed, and the three raw materials are loaded into In the graphite crucible, and seal the graphite crucible in a vacuum degree less than 10 -1 In a vacuum quartz tube of MPa;

[0039] (2) Place the above-mentioned vacuum quartz tube in a programmed temperature-controlled melting furnace, and raise the temperature from room temperature to 850°C at a rate of 3°C / min. After vacuum melting for 6 hours, the master alloy melt is quenched in oil to obtain YbZn 2 Sb 2 Quenched castings of master alloys;

[0040] (3) The above-mentioned YbZn 2 Sb 2 The quenched casting of the master alloy is ground and passed through a 400-mesh sieve to obtain YbZn 2 Sb 2 quenched powder of the ma...

Embodiment 2

[0043] Example 2: Porous structure p-type YbIn 0.05 Zn 1.95 Sb 2 Material

[0044] (1) Composed as YbIn by name 0.05 Zn 1.95 Sb 2 The stoichiometric ratio accurately weighs 2.8323g of high-purity Yb block (purity 99.995%), In powder (purity 99.99%) 0.0940g, Zn powder (purity 99.99%) 2.0875g and Sb powder (purity 99.999%) 3.9864g, Put the four ingredients into In the graphite crucible, and seal the graphite crucible in a vacuum degree less than 10 -1 In a vacuum quartz tube of MPa;

[0045] (2) Place the above-mentioned vacuum quartz tube in a programmable temperature-controlled melting furnace, and raise the temperature from room temperature to 850°C at a rate of 5°C / min. After vacuum melting for 8 hours, the master alloy melt is quenched in water to obtain YbIn 0.05 Zn 1.95 Sb 2 Quenched castings of master alloys;

[0046] (3) The above-mentioned YbIn 0.05 Zn 1.95 Sb 2 The quenched casting of the master alloy is ground and passed through a 400-mesh sieve to obt...

Embodiment 3

[0049] Example 3: Porous structure p-type YbIn 0.1 Zn 1.9 Sb 2 Material

[0050] (1) Composed as YbIn by name 0.1 Zn 1.9 Sb 2 The stoichiometric ratio accurately weighs 2.8197g of high-purity Yb block (purity 99.995%), In powder (purity 99.99%) 0.1871g, Zn powder (purity 99.99%) 2.0249g and Sb powder (purity 99.999%) 3.9686g, Put the four ingredients into In the graphite crucible, and seal the graphite crucible in a vacuum degree less than 10 -1 In a vacuum quartz tube of MPa;

[0051] (2) Place the above-mentioned vacuum quartz tube in a programmable temperature-controlled melting furnace, and raise the temperature from room temperature to 900°C at a rate of 7°C / min. After vacuum melting for 10 hours, the master alloy melt is quenched in oil to obtain YbIn 0.1 Zn 1.9 Sb 2 Quenched castings of master alloys;

[0052] (3) The above-mentioned YbIn 0.1 Zn 1.9 Sb 2 The quenched casting of the master alloy is ground and passed through a 400-mesh sieve to obtain YbIn ...

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Abstract

The invention relates to a zinc antimony based porous p-type thermoelectric material and a preparation method thereof. The general chemical formula of the material is R (Zn2-xTx) 2 (Sb2-yMy) 2, wherein R denotes an element Yb, Eu or Ca; T denotes In, Mn or Cd, x denotes T doping stoichiometric ratio, and x is more than or equal to zero and is less than or equal to 2; and M denotes Si, Ge or As, y denotes M doping stoichiometric ratio, and y is more than or equal to zero and is less than or equal to 2. The method adopts a technology of mother alloy high-temperature fusion in vacuum or under the protection of inert gas, a melt-quenching technology and a discharge plasma mother alloy sintering and quenching technology to prepare the zinc antimony based porous p-type thermoelectric material with aperture of 20-200nm. The ZT value of the material not doped with YbZn2Sb2 material can reach 0.59, the ZT value of the doped material can be further improved and the material can be used in the thermoelectric conversion power generation or refrigeration field. The invention has the advantages that the technology is simple, the preparation cycle is short, the energy consumption is low and the industrialized production can be realized.

Description

technical field [0001] The invention relates to a semiconductor thermoelectric power generation and refrigeration material, in particular to a p-type zinc-antimony-based thermoelectric material with a porous structure and a preparation method thereof, belonging to the field of thermoelectric conversion new energy materials. Background technique [0002] Thermoelectric conversion technology is a technology that utilizes the Seebeck effect and Peltier effect of semiconductor materials to realize direct mutual conversion of heat energy and electrical energy. The thermoelectric conversion system has the advantages of no pollution, no noise, small size, and high reliability. It has broad application prospects in the fields of thermoelectric power generation, refrigeration, solar energy, and industrial waste heat utilization. It has been successfully used as a special power supply and high-precision temperature controller in deep Space detection, military equipment, IT industry an...

Claims

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Application Information

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IPC IPC(8): C22C12/00C22C18/00C22C1/08
Inventor 赵文俞梁烛黄元辉张清杰
Owner WUHAN UNIV OF TECH
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