Nanosecond laser creation and photo-finishing method for periodic micro / nano composite structures on titanium alloy surfaces

Abstract

This invention relates to a nanosecond laser creation and polishing method for periodic micro / nano composite structures on titanium alloy surfaces, belonging to the technical field of titanium alloy surface micro / nano composite structure preparation. The method includes the following steps: using a nanosecond laser to perform cross-scanning on the titanium alloy surface in a nitrogen atmosphere to obtain a micrometer-scale conical periodic structure, while simultaneously forming nanoscale particles on the surface of the microconical structure; the titanium alloy surface is simultaneously nitrided during the periodic micro / nano composite structure creation process; and the nanoparticles on the surface of the periodic micro / nano composite structure are removed by adjusting the focal position of the nanosecond laser in an argon atmosphere, resulting in a polished micrometer-scale conical periodic structure. The method provided by this invention effectively solves the problem of difficult processing of micro / nano composite structures on titanium alloy surfaces, significantly enhancing their wear resistance, corrosion resistance, optical effects, and biocompatibility, while also possessing advantages such as low cost, simple process, and high efficiency.

Description

Technical Field

[0001] This invention relates to the field of titanium alloy surface micro / nano composite structure fabrication technology, and particularly to a nanosecond laser creation and photo-finishing method for periodic micro / nano composite structures on titanium alloy surfaces. This invention can significantly enhance the wear resistance, corrosion resistance, optical effects, and biocompatibility of titanium alloy surfaces, and has broad application prospects in aerospace, shipbuilding, automotive, and medical device fields. Background Technology

[0002] Titanium alloys, as a commonly used engineering material, are widely used in aerospace, shipbuilding, automotive, and medical device industries. However, their application in special environments is limited by problems such as frictional loss and poor corrosion resistance. To improve the surface properties of titanium alloys, researchers have explored the fabrication of single micro / nano structures or micro / nano composite structures on the surface of titanium alloys using different processing methods to enhance their mechanical, optical, and chemical properties.

[0003] Compared to single micrometer or nanometer structures, micro-nano composite structures offer advantages such as larger specific surface area, multifunctionality, greater flexibility in structural control, and enhanced synergistic effects. Therefore, fabricating micro-nano composite structures on titanium alloy surfaces has significant application value and practical significance. Researchers have achieved the fabrication of titanium alloy micro-nano composite structures through machining methods such as precision turning and micro-milling, but the structural accuracy is limited by the machining precision of the equipment. Micro-nano imprinting is also a common processing method, using a mold to imprint microstructures onto the titanium alloy surface. However, its disadvantages include the structure's dependence on the size and shape of the mold and the introduction of mold wear. Other techniques include ion beam etching and electrical discharge machining, each with its own advantages and disadvantages. In recent years, nanosecond laser processing technology has attracted widespread attention as a highly efficient and precise surface modification method. By using short-pulse lasers to process material surfaces and controlling laser parameters and the processing atmosphere, fine structures and nanoscale surface features can be formed on titanium alloy surfaces. These surface micro-nano composite structures possess a series of excellent properties, such as enhanced wear resistance, corrosion resistance, optical effects, and biocompatibility. Moreover, the processing of periodic micro-nano composite structures is usually irreversible. The processing method proposed in this invention can not only flexibly obtain micro-nano composite structures with different periods, but also remove nanoscale structures to obtain periodic micron-scale structures. Summary of the Invention

[0004] The purpose of this invention is to provide a nanosecond laser creation and photoforming method for periodic micro / nano composite structures on titanium alloy surfaces, solving the aforementioned problems in the prior art. This invention achieves periodic micro / nano composite structures on titanium alloy surfaces by controlling laser parameters and scanning methods within a nitrogen atmosphere, and the surfaces are simultaneously nitrided. Furthermore, photoforming of the periodic micro / nano composite structure surface is achieved within an argon atmosphere.

[0005] The above-mentioned objective of the present invention is achieved through the following technical solution:

[0006] A nanosecond laser creation and polishing method for periodic micro / nano composite structures on titanium alloy surfaces is proposed. This method involves using a nanosecond laser to perform cross-scanning on the titanium alloy surface in a nitrogen atmosphere to obtain micron-scale conical periodic structures, while simultaneously forming nanoscale particles on the surface of the microconical structures. The titanium alloy surface is nitrided concurrently during the creation of the periodic micro / nano composite structure. The nanoparticles on the surface of the periodic micro / nano composite structure are then removed by adjusting the focal position of the nanosecond laser in an argon atmosphere, resulting in a polished micron-scale conical periodic structure.

[0007] The laser parameters generated by the periodic micro-nano composite structure nanosecond laser include laser power of 4-8W, scanning speed of 5-30mm / s, scanning line spacing of 13-23μm, and nitrogen flow rate of 10L / min.

[0008] The height of the micron-scale conical periodic structure is 1-5 μm, and the period is 13-23 μm; the diameter of the nano-scale particles generated on the surface of the microconical structure is 50-1000 nm.

[0009] The synchronously nitrided surface of the titanium alloy periodic micro / nano composite structure is pale yellow.

[0010] The argon flow rate is 5 L / min, the laser power is 5.4 W, the scanning speed is 30 mm / s, the scanning line spacing is 21 μm, and the laser focus positions are +2 mm, +1 mm, 0, -1 mm, and -2 mm.

[0011] The beneficial effects of this invention are as follows: By controlling the laser parameters and scanning method in a nitrogen atmosphere, a periodic micro-nano composite structure with nanoparticles attached to a micron-sized conical structure was obtained on the surface of a titanium alloy; simultaneously, utilizing the chemical affinity between titanium and nitrogen, surface nitriding was achieved during the laser creation of the periodic micro-nano composite structure; furthermore, by adjusting the laser focus position in an argon atmosphere, the nano-sized particle structure in the periodic micro-nano composite structure was removed, resulting in a micron-sized conical periodic structure. The method provided by this invention can significantly enhance the wear resistance, corrosion resistance, optical effects, and biocompatibility of titanium alloy surfaces, and also has advantages such as low cost, simple process, and high efficiency. Attached Figure Description

[0012] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate the invention and are used to explain it, but do not constitute an undue limitation of the invention.

[0013] Figure 1The image shows the three-dimensional morphology of the periodic micro-nano composite structure on the surface of titanium alloy obtained under the conditions of laser power of 5.4W, scanning speed of 30mm / s, scanning line spacing of 19μm, and nitrogen flow rate of 10L / min.

[0014] Figure 2 The image shows the three-dimensional morphology of the periodic micro-nano composite structure on the surface of titanium alloy obtained under the conditions of laser power of 5.4W, scanning speed of 30mm / s, scanning line spacing of 21μm, and nitrogen flow rate of 10L / min.

[0015] Figure 3 The image shows the scanning electron microscope (SEM) morphology of the periodic micro / nano composite structure on the surface of titanium alloy obtained under the conditions of laser power 5.4 W, scanning speed 30 mm / s, scanning line spacing 21 μm, and nitrogen flow rate 10 L / min.

[0016] Figure 4 To conduct laser testing under the following conditions: laser power 5.4W, scanning speed 30mm / s, scanning line spacing 21μm, laser focal position +1mm, and argon flow rate 5L / min. Figure 3 Scanning electron microscope (SEM) image of the periodic micro / nano composite structure after optical finishing. Detailed Implementation

[0017] The following description, in conjunction with the accompanying drawings, further illustrates the detailed content of the present invention and its specific embodiments.

[0018] See Figures 1 to 4 As shown, the present invention discloses a nanosecond laser creation and polishing method for periodic micro-nano composite structures on titanium alloy surfaces. This method uses a nanosecond laser to perform cross-scanning on the titanium alloy surface in a nitrogen atmosphere to obtain a micrometer-scale conical periodic structure, while simultaneously forming nanoscale particles on the surface of the micro-conical structure. The titanium alloy surface is simultaneously nitrided during the creation of the periodic micro-nano composite structure. In an argon atmosphere, the nanoparticles on the surface of the periodic micro-nano composite structure are removed by adjusting the focal position of the nanosecond laser, resulting in a polished micrometer-scale conical periodic structure.

[0019] The laser parameters generated by the periodic micro-nano composite structure nanosecond laser include laser power of 4-8W, scanning speed of 5-30mm / s, scanning line spacing of 13-23μm, and nitrogen flow rate of 10L / min.

[0020] The height of the micron-scale conical periodic structure is 1-5 μm, and the period is 13-23 μm; the diameter of the nano-scale particles generated on the surface of the microconical structure is 50-1000 nm.

[0021] The synchronously nitrided surface of the titanium alloy periodic micro / nano composite structure is pale yellow.

[0022] The argon flow rate is 5 L / min, the laser power is 5.4 W, the scanning speed is 30 mm / s, the scanning line spacing is 21 μm, and the laser focus positions are +2 mm, +1 mm, 0, -1 mm, and -2 mm.

[0023] Example:

[0024] Taking Ti6Al4V alloy as an example, periodic micro-nano composite structures were prepared using nanosecond lasers at different scanning intervals in a nitrogen atmosphere. Subsequently, the periodic micro-nano composite structures were polished using nanosecond lasers in an argon atmosphere. The implementation process and beneficial effects of the present invention are further illustrated by the following examples.

[0025] See Figure 1 As shown, this periodic micro / nano composite structure was obtained under the conditions of laser power of 5.4W, scanning speed of 30mm / s, scanning line spacing of 19μm, and nitrogen flow rate of 10L / min. The height of the microcone structure measured in line A is 2.687μm, the height of the microcone structure measured in line B is 1.613μm, and the period of the microcone structure is 19.061μm.

[0026] See Figure 2 As shown, this periodic micro / nano composite structure was obtained under the conditions of laser power of 5.4W, scanning speed of 30mm / s, scanning line spacing of 21μm, and nitrogen flow rate of 10L / min. The height of the microcone structure measured in line A is 2.819μm, the height of the microcone structure measured in line B is 2.062μm, and the period of the microcone structure is 20.919μm.

[0027] Figure 3 The image shows a periodic micron-scale conical structure obtained under the conditions of laser power of 5.4W, scanning speed of 30mm / s, scanning line spacing of 21μm, and nitrogen flow rate of 10L / min, with nanoscale particles generated on the surface of the microconical structure.

[0028] Figure 4 The image shows the laser power of 5.4W, scanning speed of 30mm / s, scanning line spacing of 21μm, laser focal position of +1mm, and argon flow rate of 5L / min. Figure 3 The image shows the scanning electron microscope (SEM) morphology of the periodic micro / nano composite structure after optical finishing. It can be seen that the nanoparticles in the periodic micro / nano composite structure were removed after optical finishing, leaving only the periodic micrometer-scale conical structure.

[0029] As can be seen from the examples, the nanosecond laser creation and photoforming method for periodic micro-nano composite structures on titanium alloy surfaces proposed in this invention can create micro-nano composite structures with flexibly adjustable periods on titanium alloy surfaces, and can remove nanoscale particles through photoforming to obtain micron-scale periodic structures.

[0030] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the invention by those skilled in the art. Any modifications, equivalent substitutions, or improvements made to the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for nanosecond laser creation and photoforming of periodic micro / nano composite structures on the surface of titanium alloys, characterized in that: A nanosecond laser was used to cross-scan the surface of a titanium alloy in a nitrogen atmosphere to obtain a micron-scale conical periodic structure, while nanoscale particles were formed on the surface of the microconical structure. The titanium alloy surface was nitrided simultaneously during the formation of the periodic micro-nano composite structure. The nanoparticles on the surface of the periodic micro-nano composite structure were removed by adjusting the focus position of the nanosecond laser in an argon atmosphere to obtain a smooth micron-scale conical periodic structure. The laser parameters generated by the periodic micro-nano composite structure nanosecond laser include laser power of 4-8W, scanning speed of 5-30mm / s, scanning line spacing of 13-23μm, and nitrogen flow rate of 10L / min.

2. The method for nanosecond laser creation and photoforming of periodic micro / nano composite structures on titanium alloy surfaces according to claim 1, characterized in that: The height of the micron-scale conical periodic structure is 1-5 μm, and the period is 13-23 μm; the diameter of the nano-scale particles generated on the surface of the microconical structure is 50-1000 nm.

3. The method for nanosecond laser creation and photoforming of periodic micro / nano composite structures on titanium alloy surfaces according to claim 1, characterized in that: The synchronously nitrided surface of the titanium alloy periodic micro / nano composite structure is pale yellow.

4. The method for nanosecond laser creation and photoforming of periodic micro / nano composite structures on titanium alloy surfaces according to claim 1, characterized in that: The argon flow rate is 5 L / min, the laser power is 5.4 W, the scanning speed is 30 mm / s, the scanning line spacing is 21 μm, and the laser focus positions are +2 mm, +1 mm, 0, -1 mm, and -2 mm.

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