Metal surface with efficient dropwise condensation function and preparation method thereof

A metal surface, droplet condensation technology, used in metal processing equipment, manufacturing tools, welding equipment, etc., can solve the problems of complex technical methods and high application costs, to promote the condensation process, avoid the formation of condensation droplets, and be flexible. The effect of flexibility and designability

Inactive Publication Date: 2020-01-07
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these technical methods are relatively complicated and the application cost is high.

Method used

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  • Metal surface with efficient dropwise condensation function and preparation method thereof
  • Metal surface with efficient dropwise condensation function and preparation method thereof
  • Metal surface with efficient dropwise condensation function and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1. Preparation of the metal substrate: use mechanical processing to smooth the surface of the aluminum sheet, clean and dry it for use;

[0032] 2. Laser processing: using a femtosecond laser with a pulse width of 800 femtoseconds (repetition frequency 40kHz, average power 10W), combined with an X-Y scanning galvanometer and a flat field mirror, the laser is focused into a spot with a diameter of 40 μm, so that the laser beam The aluminum surface was ablated row by column at a speed of 100 mm / s, and the scanning pitch of each row and column was 40 μm. After laser treatment, the aluminum surface forms a periodic micro-nano structure with a papillary microstructure, that is, periodically distributed cone-shaped micron protrusions and nanoparticles on the protruding surface (the product of laser ablation), and the period of the micron-scale protrusions is about 40 μm , with a depth of about 30 μm.

[0033] 3. Surface modification: Rinse and dry the aluminum sheet treated ...

Embodiment 2

[0037] 1. Preparation of the metal substrate: firstly, the surface of the aluminum sheet is smoothed by mechanical processing, and then cleaned and dried for use;

[0038]2. Laser processing: Femtosecond pulsed laser (wavelength 532nm, pulse width 300 femtoseconds, repetition frequency 40kHz, average power 10W) ​​is used, combined with X-Y scanning galvanometer and flat field mirror, the focusing spot is 30μm. The copper surface is ablated row by row and column by row, and the spacing between each row and each column is 30 μm. The scanning speed of the laser beam is 60mm / s. After laser treatment, the copper surface forms a periodic micro-nanostructure with a papillary microstructure, that is, periodically distributed micron-scale protrusions and nanoparticles (products of laser ablation) that protrude from the surface. The periods of micron-scale protrusions are all about 30 μm, and the depth of the microstructure is about 25 μm;

[0039] 3. Surface modification: Clean and d...

Embodiment 3

[0042] 1. Preparation of the metal base material: Firstly, the surface of the titanium alloy sheet is ground flat by mechanical processing, cleaned and dried for later use;

[0043] 2. Laser processing: Femtosecond pulsed laser (wavelength 532nm, pulse width 300 femtoseconds, repetition frequency 40kHz, average power 10W) ​​is used, combined with X-Y scanning galvanometer and flat field mirror, the focusing spot is 30μm. The copper surface is ablated row by row and column by row, and the spacing between each row and each column is 30 μm. The scanning speed of the laser beam is 60mm / s. After laser treatment, a periodic micro-nano structure with a papillary microstructure is formed on the surface of the titanium alloy, that is, periodically distributed micron-scale protrusions and nanoparticles (products of laser ablation) that protrude from the surface. The periods of micron-scale protrusions are all about 100 μm, and the depth of the microstructure is about 50 μm;

[0044] 3...

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Abstract

The invention belongs to the technical field of metal surface processing, and discloses a metal surface with an efficient dropwise condensation function and a preparation method thereof. The metal surface comprises a hydrophilic area and a super-hydrophobic area. The method comprises the steps that firstly, a pulse laser is adopted for ablating a metal base material, and a periodicity concave-convex micro-nano structure is prepared on the metal surface; after the surface is cleaned, a low-surface-energy substance is used for modifying the concave-convex micro-nano structure to obtain the super-hydrophobic metal surface; then, through surface precise polish-grinding or pulse laser ablation, the low-surface-energy substance of a protrusion part in the periodicity concave-convex micro-nano structure of the super-hydrophobic surface metal is removed to prepare the metal surface; the hydrophilic area is formed on the surface of the protrusion part without the low-surface-energy substance, and a recessed part coated with the low-surface-energy substance is the super-hydrophobic area. When the metal surface is coagulated, condensation droplets are formed on the hydrophilic area preferentially, since the droplets are limited by the surrounding super-hydrophobic area, the droplets more easily leave from the metal surface, so that the surface always keeps the dropwise condensation state,and the condensation efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of surface treatment of metal base materials, and more specifically relates to a metal surface with high-efficiency droplet condensation and a preparation method thereof. Background technique [0002] The process of water vapor turning into water when it cools is called condensation. Condensation is a critical step in industrial processes such as power generation, desalination, thermal management, etc. On the solid surface, the condensation process of water vapor includes two forms: drop condensation and film condensation. During film condensation, condensed droplets form a water film on the surface, which will hinder the subsequent condensation and heat transfer process and affect the condensation efficiency. On the contrary, in the case of droplet condensation, when the condensate grows to a certain extent, it will leave the surface, so that there is always an area on the solid surface in a bare state, t...

Claims

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Application Information

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IPC IPC(8): B23P9/00B23K26/36B23K26/352B23K26/0622F28F13/18
CPCB23K26/36B23P9/00B23K26/0622B23K26/352B23K2103/04B23K2103/10B23K2103/12B23K2103/14F28F13/18F28F2245/04
Inventor 龙江游曹佐谢小柱
Owner GUANGDONG UNIV OF TECH
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