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Method for preparing high-performance p-type bismuth telluride-based thermoelectric materials

A bismuth telluride-based, thermoelectric power generation technology is applied in chemical instruments and methods, polycrystalline material growth, self-regional melting method, etc. rate and other issues, to achieve the effect of uniform performance, simple equipment and stable performance

Active Publication Date: 2011-06-29
江西纳米克热电电子股份有限公司
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  • Application Information

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Problems solved by technology

[0004] At present, the improvement of bismuth telluride-based thermoelectric materials is limited to the nanostructure to greatly reduce the thermal conductivity of the lattice, increase the Seebeck coefficient, and then improve the thermal conductivity at a certain temperature. ZT value, rather than a certain operating temperature range ZT value
At the same time, due to the high cost of nanotechnology preparation and the need for subsequent hot pressing and SPS sintering into blocks, it cannot be mass-produced in a stable manner and has been stuck in the scientific research stage.

Method used

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  • Method for preparing high-performance p-type bismuth telluride-based thermoelectric materials

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Embodiment 1

[0028] see figure 2 , a method for preparing a high-performance p-type bismuth telluride-based thermoelectric power generation material, the preparation steps are as follows:

[0029] (1) Use a copper wire brush or a blade to remove the oxide layer on the surface of the tellurium block, bismuth block and antimony block with a purity of 4N, and then pulverize them with a pulverizer;

[0030] (2) Seal one end of the glass tube with an inner diameter of 32 mm with a propane lamp and fully anneal it for 2 minutes. After cleaning with deionized water, dehydrate with alcohol and dry for later use;

[0031] (3) According to the stoichiometric ratio (Bi 0.26 Sb 0.74 ) 2 Te 3.01 , weigh a total of 1.70Kg of Bi, Sb and Te pulverized objects and place them in a dried glass tube;

[0032] (4) After evacuating the vacuum degree of the glass tube containing the material to 4Pa, seal it at a place 3cm away from the material plane;

[0033] (5) The sealed glass tube is placed in a swi...

Embodiment 2

[0039] A method for preparing a high-performance p-type bismuth telluride-based thermoelectric power generation material, the preparation steps of which are as follows:

[0040] (1) Use a copper wire brush or a blade to remove the oxide layer on the surface of the tellurium block, bismuth block and antimony block with a purity of 4N, and then pulverize them with a pulverizer;

[0041](2) Seal one end of the glass tube with an inner diameter of 35 mm with a gas lamp and fully anneal it for ≥ 3 minutes. After cleaning with deionized water, dehydrate with alcohol and dry for later use;

[0042] (3) According to the stoichiometric ratio (Bi 0。25 Sb 0。75 ) 2 Te 3.00 , weigh Bi, Sb and Te pulverized objects and place them in dried glass tubes;

[0043] (4) After the vacuum degree of the glass tube containing the material is evacuated to 3Pa, seal it at a place 4cm away from the material plane;

[0044] (5) Put the sealed glass tube in a swing melting furnace at 600~700°C, swin...

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Abstract

The invention discloses a method for preparing high-performance p-type bismuth telluride-based thermoelectric materials. High-purity tellurium blocks, bismuth blocks and stibium blocks which are industrially produced are used as raw materials, and the method comprises the following steps of: removing oxide layers, crushing, weighing in a certain ratio, and putting into a treated glass tube; and performing packaging, melting, zone-melting growth and annealing to obtain p-type bismuth telluride-based thermoelectric semiconductor crystal bars. At the temperature of between 30 and 300DEG C, the average ZT value is more than 0.75. The raw materials are cheap, readily available, nontoxic, and environment-friendly; and the equipment and process are simple, the energy consumption is low, the yield is high, and the method is suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to the manufacture of new materials and belongs to the field of new energy materials, in particular to a preparation method of a high-performance p-type bismuth telluride-based thermoelectric power generation material. Background technique [0002] New energy materials and technologies are one of the indispensable important material and technological foundations for the sustainable development of mankind in the 21st century. Thermoelectric materials are a new type of environmentally friendly new energy materials, which are more and more widely used in thermoelectric cooling and thermoelectric power generation. Due to the unique advantages of thermoelectric power generation in the recovery and utilization of low-temperature waste heat, it will become the main development direction of the thermoelectric industry in the future. Therefore, a high-performance p-type bismuth telluride-based thermoelectric material is developed to meet ...

Claims

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Application Information

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IPC IPC(8): C30B29/46C30B13/00
Inventor 郑俊辉陈果郑艳丽张卫华
Owner 江西纳米克热电电子股份有限公司
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