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Material surface micro-nano composite strengthening boiling structure as well as preparation method and application thereof

A technology of enhanced boiling and composite structure, applied in the direction of manufacturing tools, welding equipment, heat exchange equipment, etc., can solve the problems of inability to provide multi-scale structure enhanced boiling heat transfer, electrochemical processing cycle is slow, not suitable for mass production, etc. , to achieve the effect of large operation area, short processing cycle and adjustable parameters

Active Publication Date: 2019-07-05
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the template method, chemical corrosion method, and electrochemical method have slow processing cycles, high operating costs, and are not suitable for mass production. Thermal sintering methods and mechanical processing methods also have disadvantages in terms of structural accuracy and shape control.
And in order to obtain the micro-nano composite structure even requires the combination of the above-mentioned multiple methods (application publication numbers CN 106400067 A and CN 109023459 A), further increasing the complicated procedures
At the same time, the types of materials applicable to the above methods are limited, and it is impossible to provide a universal multi-scale structure to meet the needs of enhanced boiling heat transfer in different industries

Method used

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  • Material surface micro-nano composite strengthening boiling structure as well as preparation method and application thereof
  • Material surface micro-nano composite strengthening boiling structure as well as preparation method and application thereof
  • Material surface micro-nano composite strengthening boiling structure as well as preparation method and application thereof

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preparation example Construction

[0063] The invention provides a method for preparing a micro-nano composite enhanced boiling structure on the surface of a material, which specifically includes the following steps:

[0064] 1) Pretreatment of base materials:

[0065] The surface of the material is ultrasonically cleaned with water and ethanol, and vacuum-dried; the time of the ultrasonic cleaning is 0.25h to 2.0h, and the frequency of the ultrasonic cleaning is 60Hz to 120Hz; the temperature of the vacuum drying is 20°C to 100°C, The time of the vacuum drying is 2h~24h;

[0066] 2) Form the micro-nano composite enhanced boiling structure by laser integrated etching method, wherein the laser used is a pulsed laser with a pulse width of at least nanosecond level (10 -9 s); further, the pulse width of the pulsed laser can also be picosecond level (10 -12 s) or femtosecond level (10 -15 s); the output power of the laser is 3W-30W, the pulse frequency of the laser is 20Hz-200kHz, the moving speed of the laser i...

Embodiment 1

[0073] The micro-nano composite enhanced boiling structure on the surface of the copper sheet is prepared by using an ultraviolet semiconductor nanosecond pulsed laser with a wavelength of 355nm, including the following steps:

[0074] 1) Place a copper sheet with a thickness of 1mm in water and ethanol in order to ultrasonically clean it for 0.5h at a frequency of 100Hz, and dry it in vacuum at 20°C for 12h;

[0075] 2) The micro-nano composite enhanced boiling structure is formed by laser integrated etching method. The laser used is an ultraviolet semiconductor nanosecond pulse laser with a wavelength of 355nm and a pulse width of 10 -9 s; the laser output power is 5W, the laser pulse frequency is 20Hz, and the laser moving speed is 1000mm / s; the laser integrated etching method specifically includes the following steps:

[0076] Place the pretreated copper sheet on the laser micromachining platform, pre-design the laser moving path, use the equal-spaced criss-cross grooves t...

Embodiment 2

[0086] The micro-nano composite enhanced boiling structure on the surface of the copper plate is prepared by using an ultraviolet semiconductor nanosecond pulsed laser with a wavelength of 355nm, including the following steps:

[0087] 1) Place a copper plate with a thickness of 3mm in water and ethanol in sequence for 0.5h, ultrasonic cleaning at a frequency of 100Hz, and vacuum-dry at 20°C for 12h;

[0088] 2) The micro-nano composite enhanced boiling structure is formed by laser integrated etching method. The laser used is an ultraviolet semiconductor nanosecond pulse laser with a wavelength of 355nm and a pulse width of 10 -9 s; the laser output power is 3W, the laser pulse frequency is 40Hz, and the laser moving speed is 1000mm / s; the laser integrated etching method specifically includes the following steps:

[0089] Place the pretreated copper plate on the laser micromachining platform, pre-design the laser moving path, use the equal-spaced criss-cross grooves to form co...

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Abstract

The invention discloses a material surface micro-nano composite strengthening boiling structure as well as a preparation method and application of the material surface micro-nano composite strengthening boiling structure. The material surface micro-nano composite strengthening boiling structure comprises a base material and a micro-nano composite structure formed on the surface of the base material. The micro-nano composite structure comprises micro mastoids, communication-type grooves and nano-folds, wherein the micro mastoids are formed in the communication-type grooves, and the surfaces ofthe micro mastoids are provided with nano-fold shapes. The preparation method of the material surface micro-nano composite strengthening boiling structure comprises the following step of forming a micro-nano composite strengthening boiling structure on the base material through a laser integrated etching method. The material surface micro-nano composite strengthening boiling structure has multi-scale micron and nanometer characteristics in different levels.

Description

technical field [0001] The invention relates to the technical field of nanomaterial preparation. More specifically, it relates to a material surface micro-nano composite enhanced boiling structure and its preparation method and application. Background technique [0002] Energy saving and emission reduction is a major strategic goal related to the sustainable development of my country's economy and society. How to improve heat transfer efficiency has great application requirements in important industrial sectors such as thermal power generation, chemical production, and electronic device cooling. Taking boiler steam power generation as an example, at the end of 2015, the state promulgated the "Comprehensive Implementation of Ultra-low Emission and Energy-Saving Transformation Work Plan for Coal-fired Power Plants", requiring that coal-fired units should be fully implemented with ultra-low emission and energy-saving transformation before 2020, so that all active power plants ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F28F13/00B23K26/362
CPCB23K26/362F28F13/00F28F2013/001F28F2255/20
Inventor 江雷田野徐哲
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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