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High-temperature superconductive element based on nano material and its prepn.

A nanomaterial and thermal superconducting technology, applied in the energy field, can solve the problems of large thermal resistance, low heat transfer efficiency, large volume, etc., and achieve the effects of uniform surface temperature, improved heat transfer coefficient, and fast thermal conductivity.

Inactive Publication Date: 2009-01-28
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a thermal superconducting element based on nanomaterials and its preparation method in order to overcome the defects of low heat transfer efficiency, large volume, and large thermal resistance in existing industrial and civil heat exchange equipment.

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The raw materials are: metal Al powder with a melting point of 660°C and a particle size of 1-100 μm; metal Cu powder with a melting point of 1063°C and a particle size of 1-100 μm. The specific steps are: mix Al and Cu metal powders in a weight ratio of 5:95 and place them in a high-energy ball mill, grind them at 450°C to form Al-Cu composite metal powders with a particle size in the range of 20-50nm, and use this The powder is sprayed on the inner and outer walls of the heat exchange tube by plasma method, and then the metal Al in it is evaporated at 880°C by laser evaporation technology to form a thermal ultra-thin copper nanocrystal particle with a thickness of 100nm-4μm and a pore size distribution of 30-50nm. guide layer. As described above, the present invention can be preferably realized.

Embodiment 2

[0020] The raw materials are: metal Al powder with a melting point of 660°C and a particle size of 1-100 μm; metal Cu powder with a melting point of 1063°C and a particle size of 1-100 μm. The specific steps are as follows: mix Al and Cu metal powders in a weight ratio of 15:85, place them in a high-energy ball mill, and grind them at 450°C to form Al-Cu composite metal powders with a particle size in the range of 20-50nm. The powder is sprayed on the inner and outer walls of the heat exchange tube by plasma method, and then the metal Al in it is evaporated at 800°C by laser evaporation technology to form a thermal ultra-thin copper nanocrystal particle with a thickness of 100nm-4μm and a pore size distribution of 50-70nm. guide layer. As described above, the present invention can be preferably realized.

Embodiment 3

[0022] The raw materials are: metal Al powder with a melting point of 660°C and a particle size of 1-100 μm; metal Cu powder with a melting point of 1063°C and a particle size of 1-100 μm. The specific steps are: mix Al and Cu metal powders in a weight ratio of 25:75, place them in a high-energy ball mill, and grind them at 450°C to form Al-Cu composite metal powders with a particle size in the range of 20-50nm. The powder is sprayed on the inner and outer walls of the heat exchange tube by plasma method, and then the metal Al in it is evaporated at 880°C by laser evaporation technology to form a thermal ultra-thin copper nanocrystal particle with a thickness of 100nm-4μm and a pore size distribution of 70-90nm. guide layer. As described above, the present invention can be preferably realized.

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Abstract

This invention relates to a thermal super-conductive element based on nano material and preparing method thereof. Firstly high thermal conductivity nano composite metal powder, diamond powder or metal oxide, the grain size of which is 10-100 nm, are prepared, then are made to form a coating by plasma spraying technology, and then one of the metals is made to evaporate by laser evaporation technology to form an nano or sub-micro structure on the coating surface. The heat exchange element with thermal super-conductive characteristic made thereby has the advantages of high thermal conducting rate, low thermal resistance, long service life, high efficiency and compact structure.

Description

(1) Technical field [0001] The invention relates to the field of energy technology, in particular to a nanomaterial-based thermal superconducting element and a preparation method thereof. (2) Background technology [0002] my country's industrial energy consumption accounts for about 50% of the total energy consumption of the whole society, and the energy consumption level of unit products in many energy-intensive processes is 30-90% higher than the international advanced level. As a general-purpose equipment with a large quantity and a wide range, heat exchange equipment is widely used in industrial processes to realize heat exchange in technological processes, and heat exchangers account for 33% of the total industrial energy consumption. Therefore, enhancing the heat transfer efficiency of heat exchangers has become a key technology for energy saving and consumption reduction. At present, both at home and abroad, the method of strengthening heat transfer tubes is used to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F28F21/00C23C14/26
Inventor 高学农丁静杨晓西方玉堂
Owner SOUTH CHINA UNIV OF TECH
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