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A method of preparing superhydrophobic surface by supersonic flame spraying

A supersonic flame and super-hydrophobic surface technology, which is applied in coating, fusion spraying, metal material coating process, etc., can solve the problem of reduced super-hydrophobic surface structure and performance stability, poor friction resistance, and metal coating surface The structure is easily affected by corrosion, etc., to achieve the effect of large-scale industrial application, good surface hydrophobicity, and high coating preparation efficiency

Active Publication Date: 2019-02-05
SOUTHWEST JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Most of the existing preparation methods can obtain superhydrophobic surfaces with contact angles higher than 150°, but there are still their own limitations. The defects of poor friction resistance and the surface structure of the metal coating are easily affected by corrosion, which reduces the stability of the superhydrophobic surface structure and performance. Therefore, it is necessary to develop a superhydrophobic coating preparation method that can be prepared on a large scale and has stable coating performance. Very important

Method used

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  • A method of preparing superhydrophobic surface by supersonic flame spraying
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  • A method of preparing superhydrophobic surface by supersonic flame spraying

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Embodiment 1

[0045] A method utilizing supersonic flame spraying to prepare a superhydrophobic surface, the base material is SMA490BW weathering steel, and the steps are as follows:

[0046] A. Pretreatment of the surface of the substrate: including cleaning and roughening the surface of the substrate. The roughening treatment refers to sandblasting treatment. The sandblasting process parameters are air pressure 0.7MPa, and the sand shot used for sandblasting is 80 mesh brown corundum Sand, sandblasting time 40 seconds;

[0047] B, adopt supersonic flame spraying method to prepare tungsten carbide system coating on the substrate surface after pretreatment, described spraying powder is nanometer WC-12Co powder; The flow rate of oxygen is 900L / min, the flow rate of kerosene is 23L / h, and the moving speed of the spray gun is 1.5m / s. A layer of 280-300μm coating is deposited on the surface of the substrate. The coating morphology and droplet contact angle are as follows: figure 1 shown;

[0...

Embodiment 2

[0051] A method utilizing supersonic flame spraying to prepare a superhydrophobic surface, the base material is Q235 steel, and the steps are as follows:

[0052] A. Pretreatment of the surface of the substrate: including cleaning and roughening the surface of the substrate. The roughening treatment refers to sandblasting treatment. The sandblasting process parameters are air pressure 0.7MPa, and the sand shot used for sandblasting is 60 mesh brown corundum Sand, sandblasting time 35 seconds;

[0053] B. Prepare a tungsten carbide system coating on the surface of the pretreated substrate by supersonic flame spraying method, the spraying powder is nano WC-10Co-4Cr powder; the spraying process parameters are: powder feeding amount 82g / min, spraying distance 350mm, oxygen flow rate 900L / min, kerosene flow rate 23L / h, spray gun moving speed 1.5m / s, deposit a layer of 280-300μm coating on the surface of the substrate;

[0054] C. The surface of the coating of the tungsten carbide ...

Embodiment 3

[0057] A method for preparing a superhydrophobic surface by supersonic flame spraying, the substrate is a metal material, and the steps are as follows:

[0058] A. Pretreatment of the surface of the substrate: including cleaning and roughening the surface of the substrate. The roughening treatment refers to sandblasting treatment. The sandblasting process parameters are air pressure 0.5MPa, and the sand shot used for sandblasting is 120 mesh brown corundum Sand, sandblasting time 60 seconds;

[0059] B. Prepare a tungsten carbide system coating on the surface of the pretreated substrate by supersonic flame spraying method, the spraying powder is nano WC-12Co powder; the spraying process parameters are: powder feeding amount 78g / min, spraying distance 320mm, Oxygen flow 900L / min, kerosene flow 25L / h, spray gun moving speed 1.2m / s;

[0060] C. The surface of the coating of the tungsten carbide system prepared in step B is modified with a layer of low surface energy substances t...

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Abstract

The invention discloses a method for preparing a superhydrophobic surface by utilizing supersonic flame spraying. The method comprises the following steps: A, carrying out pretreatment on a matrix surface; B, preparing a tungsten carbide system coating on the pretreated matrix surface by adopting a supersonic flame spraying method, wherein spraying powder is tungsten carbide system powder; C, modifying a layer of low surface energy material on the surface of the tungsten carbide system coating prepared in the step B to obtain a superhydrophobic coating. The method has the advantages that the superhydrophobic surface with a large area can be prepared on various workpiece bases with complex structures, and the method is simple in manufacturing process, high in preparation efficiency, low in cost, suitable for field construction and the like. In addition, the hydrophobic surface prepared by the method has an excellent hydrophobic property and an self-cleaning effect, also has both the toughness of a metal coating and the wear resistance performance and the corrosion resistance performance of a ceramic coating, and has a certain anti-icing function.

Description

technical field [0001] The invention relates to a preparation technology and method of a superhydrophobic coating, in particular to a method for preparing a superhydrophobic surface by supersonic flame spraying. Background technique [0002] Superhydrophobic material is a kind of bionic material. Its research originates from people's research on the hydrophobic characteristics of lotus leaves. When studying the surface of lotus leaves, it is found that water droplets will quickly roll down on the surface of lotus leaves without leaving traces, and can take away the surface of the lotus leaves. dirt, so the lotus leaf surface is always kept clean. Therefore, this self-cleaning function is called "lotus leaf effect". In recent years, due to the special wettability of the surface of superhydrophobic materials, it has been widely used in many fields such as anti-corrosion, self-cleaning, drag reduction, anti-fog and anti-icing. [0003] It is generally believed that the superh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/129C23C4/10C23C4/18
CPCC23C4/10C23C4/129C23C4/18
Inventor 刘艳席乃园陈辉杭宗秋刘楠张相宁
Owner SOUTHWEST JIAOTONG UNIV
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