Process for ethanol-assisted laser processing of gradient hydrophobic titanium alloy sheets

Abstract

The application provides a process for gradient hydrophobic titanium alloy plate by ethanol-assisted laser processing, which comprises the following steps: roughening the surface of the titanium alloy plate by laser, injecting ethanol solution and processing the skeleton with a grid structure on the surface of the titanium alloy plate by laser at the same time to realize the wetting performance of the surface of the titanium alloy plate, grinding and removing the resolidification ridge on the surface of the titanium alloy plate, and modifying and heat treating by fluorosilane to realize the hydrophobic and oleophobic performance of the surface of the titanium alloy plate; the grid structure gradually shrinks in a gradient change from one side of the titanium alloy plate to the other side. The process for gradient hydrophobic titanium alloy plate by ethanol-assisted laser processing can consider the wetting and gradient hydrophobicity of the surface of the titanium alloy plate, solves the problems of low wetting and uncontrollable gradient hydrophobic surface of the titanium alloy plate in the prior art, reduces the production cost, and realizes stable and automatic production.

Description

Technical Field

[0001] This invention relates to the field of laser processing technology, and more specifically, to a process for ethanol-assisted laser processing of gradient hydrophobic titanium alloy plates. Background Technology

[0002] Titanium alloy plates are widely used in industrial water collection substrates due to their excellent mechanical properties, high yield strength, and superior corrosion resistance. However, because titanium alloy plates have low and uniform surface wettability, rapid directional water collection cannot be achieved. Therefore, a gradient hydrophobic treatment is required on the surface of the titanium alloy plates.

[0003] Currently, gradient hydrophobic surfaces of titanium alloy plates are generally fabricated by controlling the processing time through methods such as gradual solution ascent, stepwise substrate movement, vapor diffusion, and physical vapor deposition. However, these methods are costly, difficult to control, and hard to achieve stable automated production. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings and deficiencies of the prior art and provide a process for ethanol-assisted laser processing of gradient hydrophobic titanium alloy plates. This process can take into account both the wettability and gradient hydrophobicity of the titanium alloy plate surface, solve the drawbacks of low wettability and difficulty in control of the gradient hydrophobic surface of titanium alloy plates in the existing methods, reduce manufacturing costs, and achieve stable automated production.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solution: a process for gradient hydrophobic titanium alloy plate by ethanol-assisted laser processing, characterized in that: the surface of the titanium alloy plate is roughened by laser processing; ethanol solution is simultaneously injected into the surface of the laser-roughened titanium alloy plate, and a grid structure skeleton with laser processing is performed to achieve the wettability of the titanium alloy plate surface; the remelted ridges on the surface of the titanium alloy plate are removed by grinding, and the surface of the titanium alloy plate is modified with fluorosilane and heat-treated to achieve the hydrophobic and oleophobic properties of the titanium alloy surface; the grid structure gradually decreases in size from one side of the titanium alloy plate to the other side.

[0006] In the above scheme, ethanol-assisted laser processing can improve the wettability of the titanium alloy plate, thereby enhancing hydrophobicity and enabling rapid water droplet collection. Simultaneously, by controlling the size of the grid, different hydrophobic surfaces can be obtained, forming a gradient hydrophobic surface that promotes water transport. This method is low-cost, easy to control, and allows for stable automated production. Furthermore, the gradient-decreasing grid structure allows the titanium alloy plate to obtain different wettability regions, with wettability decreasing from high to low. This generates a Laplace gradient pressure in the water droplets, which facilitates the coalescence of small water droplets into larger ones, thus promoting water collection and enabling the titanium alloy plate to achieve rapid, directional water collection.

[0007] The surface of the titanium alloy plate is roughened by laser. Ethanol solution is injected onto the surface of the laser-roughened titanium alloy plate while a framework with a grid structure is processed by laser to achieve the wettability of the titanium alloy plate surface. Grinding is used to remove the remelting ridges on the surface of the titanium alloy plate, and fluorosilane modification and heat treatment are carried out to achieve the hydrophobic and oleophobic properties of the titanium alloy plate surface, which includes the following steps:

[0008] Step 1: Load an ethanol solution with a concentration ≥ 99.7% into a micro syringe.

[0009] Step 2: In an argon atmosphere, roughen the surface of the precision-milled titanium alloy plate using a laser.

[0010] Step 3: Inject the ethanol solution onto the surface of the laser-roughened titanium alloy plate using a micro syringe while processing a framework with a grid structure using a laser. The injection of the ethanol solution and the laser processing cooperate simultaneously to perform processing on the surface of the laser-roughened titanium alloy plate.

[0011] Step 4: Use sandpaper to grind and remove the remelting ridges on the surface of the titanium alloy plate and clean the debris using ultrasonic waves.

[0012] Step 5: Modify the surface of the titanium alloy plate using fluorosilane and perform heat treatment.

[0013] Between Step 1 and Step 2, there is also a step of precision-milling the surface of the titanium alloy plate using a CNC milling machine.

[0014] Precision-milling the surface of the titanium alloy plate uses a cylindrical end mill with a diameter of 16 mm. The precision-milling cutting parameters are: feed rate is 100 mm / min, rotational speed is 1500 rpm, and cutting depth is 0.02 mm.

[0015] In Step 2, the parameters for laser roughening are: average power is 10 W, defocus amount is 0 mm, repetition frequency is 20 kHz, scanning speed is 500 mm / s, scanning line spacing is 0.005 mm, and scanning times are 2.

[0016] In Step 3, the amount of ethanol solution required for each grid structure formed by processing is 5 μl.

[0017] In Step 3, each grid structure and the framework around each grid structure are regarded as a unit. The maximum size of each unit is 400 μm. The laser processing parameters are: average power is 20 W, defocus amount is 0 mm, frequency is 40 kHz, scanning speed is 150 mm / s, scanning spacing is 0.001 mm, scanning times are 50, and the scanning path is a "return" character.

[0018] In step 4, the remelted ridges on the surface of the titanium alloy plate are removed by sanding with 1000CW sandpaper for 100 times, and the titanium alloy plate is cleaned with ultrasonic waves at a frequency of 28kHz for 20 minutes to remove debris.

[0019] In step 5, the surface of the titanium alloy plate is modified with fluorosilane, and the concentration of the fluorosilane ethanol solution is 0.5% (w / w); the titanium alloy plate is immersed in the solution for 20 minutes, and then taken out and subjected to heat treatment.

[0020] In step 5, the heat treatment refers to placing the titanium alloy plate after soaking in the solution into a constant temperature oven for 20 minutes at a temperature of 100°C.

[0021] In the process of producing gradient hydrophobic titanium alloy plates using ethanol-assisted laser processing of this invention, the laser processing under ethanol assistance creates numerous micropores on the material's surface and internal structure due to bubble movement and rapid ethanol cooling. These micropores can accommodate air, thereby increasing the wettability of the solid surface (larger contact angle, better hydrophobicity). Furthermore, ethanol-assisted laser processing increases the carbon content on the material's surface and internal structure. Carbon, as a nonpolar atom, and water, as a polar molecule, exhibit repulsive behavior, thus improving wettability. Simultaneously, the grid structure framework forms a gradient hydrophobic surface, promoting water transport. This process is low-cost, easy to control, and allows for stable automated production.

[0022] In step 3, a small amount of ethanol is first injected into the grid structure on the surface of the titanium alloy plate to be processed using a micro-injector. Then, a laser is used to rapidly process this grid structure. Each grid unit is injected with ethanol once to avoid the problem of rapid evaporation of ethanol exposed to air, ensuring that the titanium alloy plate is laser-processed with ethanol assistance, while also preventing excessive ethanol from igniting under laser action. In addition, the gradient-shaped, gradually decreasing grid structure allows the titanium alloy plate to obtain different wettability zones. The wettability decreases from high to low, which can generate a Laplace gradient pressure for water droplets. This is conducive to the coagulation of small water droplets into large water droplets, thus facilitating water collection and enabling the titanium alloy plate to achieve rapid directional water collection.

[0023] Compared with the prior art, the present invention has the following advantages and beneficial effects: the process of gradient hydrophobic titanium alloy plate processed by ethanol-assisted laser processing of the present invention can take into account both the wettability and gradient hydrophobicity of the titanium alloy plate surface, solve the drawbacks of low wettability and difficulty in control of the gradient hydrophobic surface of titanium alloy plate in the existing methods, reduce the manufacturing cost, and realize stable automated production. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the gradient hydrophobic titanium alloy plate processing technology using ethanol-assisted laser processing in the processing of titanium alloy plates according to the present invention.

[0025] Figure 2 yes Figure 1 Schematic diagram of the DD direction;

[0026] Among them, 1 is a titanium alloy plate, 2 is a grid structure, 3 is a skeleton, 4 is a remelted ridge, 5 is a micro-injector, and 6 is a laser. Detailed Implementation

[0027] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0028] Example

[0029] like Figure 1 and Figure 2 As shown, the process of the gradient hydrophobic titanium alloy plate processed by ethanol-assisted laser processing of the present invention is as follows: the surface of the titanium alloy plate 1 is roughened by laser, and ethanol solution is injected into the surface of the roughened titanium alloy plate 1 and a skeleton 3 with grid structure 2 is processed by laser to achieve the wettability of the surface of the titanium alloy plate 1; the remelted ridges 4 on the surface of the titanium alloy plate 1 are removed by grinding, and the surface of the titanium alloy plate 1 is modified by fluorosilane and heat-treated to achieve the hydrophobic and oleophobic properties of the surface of the titanium alloy plate 1, wherein the grid structure 2 gradually decreases in size from one side of the titanium alloy plate 1 to the other side.

[0030] Specifically, the following steps are included:

[0031] Step 1: Prepare an ethanol solution by filling a microsyringe 5 with an inner diameter of 0.2 cm with an ethanol solution of ≥99.7%.

[0032] Step 2: Use a CNC milling machine to finish mill the surface of the titanium alloy plate. The finish milling of the titanium alloy plate surface is carried out using a cylindrical end mill with a diameter of 16mm. The finish milling cutting parameters are: feed rate of 100mm / min, rotation speed of 1500rpm, and depth of cut of 0.02mm.

[0033] Step 3: In an argon atmosphere, use a laser to roughen the surface of the precision-milled titanium alloy plate. The laser roughening parameters are: average power of 10W, defocusing amount of 0mm, repetition frequency of 20kHz, scanning speed of 500mm / s, scanning line spacing of 0.005mm, and number of scans of 2.

[0034] Step 4: Using a micro-injector 5, an ethanol solution is injected into the surface of the laser-roughened titanium alloy plate 1, while simultaneously using a laser 6 to laser process the skeleton 3 with the grid structure 2; the injection of ethanol solution and laser processing work together to process the surface of the laser-roughened titanium alloy plate 1.

[0035] The amount of ethanol solution required for each processed grid structure 2 is 5 μl. Each grid structure 2 and the framework 3 around each grid structure are taken as a unit, and the maximum size of each unit is 400 μm. The laser processing parameters are as follows: the average power is 20 W, the defocus amount is 0 mm, the frequency is 40 kHz, the scanning speed is 150 mm / s, the scanning pitch is 0.001 mm, the number of scans is 50, and the scanning path is a "return" character. The processed grid structures 2 gradually shrink in a gradient from one side of the titanium alloy plate 1 to the other side.

[0036] Step 5: Use 1000 CW sandpaper to polish and remove the remelting ridge 4 on the surface of the titanium alloy plate 1. The number of polishing times is 100 times, and use ultrasonic waves with a frequency of 28 kHz to clean the titanium alloy plate 1 for 20 min to remove debris.

[0037] Step 6: Perform fluoroalkylsilane modification on the surface of the titanium alloy plate 1. The concentration of the fluoroalkylsilane ethanol solution is 0.5% (w / w); immerse the titanium alloy plate 1 in the solution for 20 min, and then perform heat treatment after taking it out. This heat treatment means putting the titanium alloy plate 1 after soaking in the solution into a constant temperature oven for heat treatment for 20 min, and the oven temperature is 100 °C.

[0038] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principle of the present invention shall be equivalent replacement methods and are all included in the protection scope of the present invention.

Claims

1. A process for ethanol-assisted laser processing of a gradient hydrophobic titanium alloy sheet, characterized by: The surface of a titanium alloy plate is roughened by laser. Ethanol solution is injected onto the surface of the laser-roughened titanium alloy plate while laser processing is carried out to form a grid-structured framework, achieving the wettability of the titanium alloy plate surface; the remelting ridges on the surface of the titanium alloy plate are removed by grinding, and hydrophobic and oleophobic properties of the titanium alloy plate surface are achieved through fluorosilane modification and heat treatment; the grid structure gradually shrinks in a gradient manner from one side of the titanium alloy plate to the other side. It includes the following steps: Step 1, load an ethanol solution with a concentration ≥ 99.7% into a micro syringe. Step 2, in an argon atmosphere, roughen the surface of the precision-milled titanium alloy plate using a laser. Step 3, use the micro syringe to inject the ethanol solution onto the surface of the laser-roughened titanium alloy plate, and simultaneously use a laser to process a grid-structured framework; the injection of the ethanol solution and the laser processing cooperate with each other to perform processing on the surface of the laser-roughened titanium alloy plate. Step 4, use sandpaper to grind and remove the remelting ridges on the surface of the titanium alloy plate, and clean the debris with ultrasonic waves. Step 5, modify the surface of the titanium alloy plate with fluorosilane and perform heat treatment.

2. The process for ethanol-assisted laser processing of graded hydrophobic titanium alloy sheets of claim 1, wherein: Between Step 1 and Step 2, it also includes the step of precision milling the surface of the titanium alloy plate using a CNC milling machine.

3. The process for ethanol-assisted laser processing of graded hydrophobic titanium alloy sheets of claim 2, wherein: Precision milling the surface of the titanium alloy plate uses a cylindrical end mill with a diameter of 16 mm; the precision milling cutting parameters are: the feed rate is 100 mm / min, the rotational speed is 1500 rpm, and the cutting depth is 0.02 mm.

4. The process for ethanol-assisted laser processing of graded hydrophobic titanium alloy sheets of claim 1, wherein: In Step 2, the parameters for laser roughening are: the average power is 10 W, the defocus amount is 0 mm, the repetition frequency is 20 kHz, the scanning speed is 500 mm / s, the scanning line spacing is 0.005 mm, and the number of scans is 2.

5. The process for ethanol-assisted laser processing of graded hydrophobic titanium alloy sheets of claim 1, wherein: In Step 3, the amount of ethanol solution required for each processed grid structure is 5 μl.

6. The process for ethanol-assisted laser processing of graded hydrophobic titanium alloy sheets of claim 1, wherein: In Step 3, each grid structure and the framework around each grid structure are regarded as a unit, and the maximum size of each unit is 400 μm. The laser processing parameters are: the average power is 20 W, the defocus amount is 0 mm, the frequency is 40 kHz, the scanning speed is 150 mm / s, the scanning spacing is 0.001 mm, the number of scans is 50, and the scanning path is "回" (it should be noted that "回" here may be a specific symbol or incorrect character, if it is a misrepresentation, it needs to be corrected according to the actual situation).

7. The process for ethanol-assisted laser processing of graded hydrophobic titanium alloy sheets of claim 1, wherein: In Step 4, use 1000 CW sandpaper to grind and remove the remelting ridges on the surface of the titanium alloy plate, and the number of grinding times is 100 times. Use ultrasonic waves with a frequency of 28 kHz to clean the titanium alloy plate for 20 min to remove the debris.

8. The process for ethanol-assisted laser processing of graded hydrophobic titanium alloy sheets of claim 1, wherein: In Step 5, perform fluorosilane modification on the surface of the titanium alloy plate, and the concentration of the fluorosilane ethanol solution is 0.5% (w / w); soak the titanium alloy plate in the solution for 20 min, and then take it out for heat treatment.

9. The process for ethanol-assisted laser processing of a gradient hydrophobic titanium alloy sheet of claim 8, wherein: In Step 5, the heat treatment refers to putting the titanium alloy plate soaked in the solution into a constant-temperature oven for heat treatment for 20 min, and the oven temperature is 100 °C.

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