Method for preparing abrasion-resistant super-hydrophobic ceramic coating through thermal spraying technology and product

A ceramic coating and super-hydrophobic technology, applied in the coating, metal material coating process, fusion spraying, etc., can solve the complex process, difficult to achieve large-area super-hydrophobic surface preparation, and industrial application, etc., to achieve Good wear resistance, good self-cleaning property and long service life

Active Publication Date: 2016-02-10

NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI

4 Cites 29 Cited by

AI-Extracted Technical Summary

Problems solved by technology

[0004] At present, there have been many technologies to achieve superhydrophobic properties, but the process is relatively complicated, and it is difficult to achieve large-scale preparation of superhydrophobic surfaces, and industrial applications...

Method used

(1) substrate is cleaned with acetone, hydrochloric acid, deionized water successively, adopts 60 order brown corundum sands to roughen substrate surface sandblasting, the air pressure that blasting adopts is 0.5Mpa, and blasting time is 10 seconds , the number of sand shot used for sandblasting is 100 mesh to increase the surface roughness of the substrate and improve the bonding strength of the coating;

(4) superhydrophobic coating is obtained after spraying is finished, and its contact angle is 153 °, has good superhydrophobicity, and rolling angle is 5 °, and Fig. 1 is the superhydrophobic coating surface scanning electron micrograph of preparation, wherein , a-1, a-2, and a-3 are the surface topography diagrams of different magnifications respectively. It can be seen fro...

Abstract

The invention discloses a method for preparing an abrasion-resistant super-hydrophobic ceramic coating through a thermal spraying technology and a product. The method includes the following steps that (1) a substrate is subjected to surface roughening treatment; (2) a micro-patterned ceramic coating is prepared on the surface of the substrate through a plasma spraying technology; and (3) a low surface energy substance layer is sprayed to the obtained ceramic coating through a liquid material flame spraying technology, and the super-hydrophobic abrasion-resistant coating can be obtained. The material obtained through the preparing method has both the advantages of abrasion resistance and super-hydrophobic property, the tribological property of the super-hydrophobic coating is greatly improved, the static contact angle of the obtained coating can reach 150-180 degrees, and the rolling angle of the coating is smaller than 5 degrees. The method can prepare the abrasion-resistant super-hydrophobic coating on the basis of the surfaces of different substrates and is wide in the application range.

Application Domain

Molten spray coating

Technology Topic

Surface energyRolling angle +5

Image

Examples

Experimental program(2)

Example Embodiment

[0033] Example 1

[0034] In this embodiment, 316 stainless steel with a thickness of about 2mm is taken as the substrate, and the specific preparation method of the wear-resistant super-hydrophobic coating is as follows:

[0035] (1) Clean the substrate with acetone, hydrochloric acid, and deionized water in turn, and use 60-mesh brown corundum sand to roughen the surface of the substrate. The air pressure used for sandblasting is 0.5Mpa, and the sandblasting time is 10 seconds. The mesh number of sand shot is 100 mesh to increase the surface roughness of the substrate and improve the bonding strength of the coating;

[0036] (2) Using the method of plasma spraying, to TiO 2 Powder (average particle size is 100μm) is used as spraying material, and the spraying parameters of plasma spraying are controlled as follows: arc voltage 40V, arc current 300A, main air flow 40L/min, auxiliary air flow 12L/min, powder feeding speed 50g/min, spraying distance 150mm;,

[0037] (3) using the liquid material flame spraying technology to spray the low surface energy material layer, the copper nanoparticles decorated with PTFE is the low surface energy material, and the specific preparation method is: the concentration of 5% (mass percent) alumina nanoparticles ( diameter of about 100 nanometers) was added to ethanol, then 5% PTFE was added to the solution, and the mixture was stirred evenly.

[0038] The process parameters of liquid flame spraying are: combustion-supporting gas O 2 , the pressure is 0.5MPa, the flow rate is 3Nm 3 /h, C 2 H 2 The pressure is 0.1MPa and the flow rate is 2Nm 3 /h, the powder feeding speed is 50g/min, and the spraying distance is 150mm.

[0039] (4) After spraying, a superhydrophobic coating was obtained with a contact angle of 153°, good superhydrophobicity, and a rolling angle of 5°. figure 1 are the SEM images of the prepared superhydrophobic coating surface, where a-1, a-2, and a-3 are the surface topography images at different magnifications, respectively. figure 1 It can be seen that the layer has obvious micro-nano structures.

[0040] (5) Research on the wear resistance of the superhydrophobic coating: under 25KPa, the surface of the superhydrophobic coating was subjected to a friction test using 800-grit sandpaper. The schematic diagram of the process is shown in the figure below. image 3 shown.

[0041] The coating prepared in this example is well bonded to the substrate, with a thickness of about 100 μm, and has good wear-resistant and super-hydrophobic properties.

Example Embodiment

[0042] Example 2

[0043] In this embodiment, in order to study the microscopic characteristics of the coating, different controllable micropattern structures are prepared based on 316 stainless steel in this embodiment. The specific operations are as follows:

[0044] (1) Clean the substrate with acetone, hydrochloric acid, deionized water, etc. in turn, and use 60-mesh brown corundum sand to roughen the surface of the substrate. The air pressure used for sandblasting is 0.6MPa to increase the surface roughness of the substrate. Meet the roughness requirements of spraying;

[0045] (2) In order to realize the micro-patterning of the ceramic coating, 200 mesh, 120 mesh, and 80 mesh stainless steel meshes were used as the spray substrate in the plasma spraying process;

[0046] (3) Using the method of plasma spraying, to TiO 2The powder (average particle size is 100μm) is used as the spraying material. The spraying parameters for controlling the plasma spraying are: arc voltage 40V, arc current 300A, main air flow 50L/min, auxiliary air flow 15L/min, powder feeding speed 60g/min, spraying Distance 160mm;

[0047] (4) Using liquid flame spraying technology to spray low surface energy substances, using PTFE-modified copper nanoparticles as low surface energy substances, the specific preparation method is: adding Cu nanoparticles with a concentration of 5% (mass percentage) to ethanol , and then 5% PTFE was added to this solution.

[0048] The process parameters of liquid flame spraying are: combustion-supporting gas O 2 The pressure is 0.6MPa and the flow rate is 4Nm 3 /h, C 2 H 2 The pressure is 0.2MPa and the flow rate is 3Nm 3 /h, the powder feeding speed is 60g/min, and the spraying distance is 160mm.

[0049] (5) After spraying, a superhydrophobic coating is obtained with a contact angle of 154° and good superhydrophobicity. figure 2 The SEM images of the surface of the prepared wear-resistant superhydrophobic coating, where b-1, b-2, and b-3 are the surface topography images at different magnifications (when the stainless steel mesh is 200 mesh), c-1, c-2, c-3 are the surface topography diagrams of different magnifications (when the stainless steel mesh is 120 mesh), d-1, d-2, d-3 are the surface topography diagrams of different magnifications (stainless steel mesh). 80 mesh), by figure 2 It can be seen that the coating has an obvious multi-scale structure.

[0050] (6) Research on the wear resistance of superhydrophobic coating: under 25KPa, the surface of the prepared superhydrophobic coating was subjected to friction resistance test with 800-grit sandpaper. image 3 The schematic diagram of the friction performance test of the ceramic coating, Figure 4 For the contact angle test results before and after wear of the prepared wear-resistant superhydrophobic coating (when the stainless steel mesh is 120 mesh), the Figure 4 It can be seen that the contact angle of the coating after the friction test is 153 degrees, and the wear resistance is good.

[0051] The coating prepared in this example is well bonded to the substrate, with a thickness of about 100 μm, and has good wear-resistant and super-hydrophobic properties.

PUM

Property	Measurement	Unit
Thickness	2.0	mm
Thickness	100.0	µm

Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

Extended service life
good self-cleaning

Wind power and photovoltaic power complementary power supply system based on mixed energy accumulation of super capacitor accumulator

InactiveCN101309017AReduced installed capacityExtended service life

Owner:INST OF ELECTRICAL ENG CHINESE ACAD OF SCI

Method for preparing abrasion-resistant super-hydrophobic ceramic coating through thermal spraying technology and product

AI-Extracted Technical Summary

Problems solved by technology

Method used

Abstract

Image

Examples

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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