CN113770537B - Method for preparing iron-based amorphous alloy surface nanostructure through nanosecond laser irradiation - Google Patents
Method for preparing iron-based amorphous alloy surface nanostructure through nanosecond laser irradiation Download PDFInfo
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- CN113770537B CN113770537B CN202111243417.7A CN202111243417A CN113770537B CN 113770537 B CN113770537 B CN 113770537B CN 202111243417 A CN202111243417 A CN 202111243417A CN 113770537 B CN113770537 B CN 113770537B
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- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/352—Working by laser beam, e.g. welding, cutting or boring for surface treatment
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Abstract
The invention relates to a method for preparing a nano structure on the surface of an iron-based amorphous alloy by nanosecond laser irradiation, belonging to the field of micro-nano processing on the surface of a material. The method comprises the following steps: mechanically grinding and polishing the surface of the amorphous alloy; sequentially carrying out ultrasonic cleaning on the amorphous alloy in absolute ethyl alcohol and acetone; by utilizing the chemical affinity of erbium element and oxygen element under the high temperature condition and the mismatching of the formed compound and the wettability of the matrix, nano-structure is formed on the surface of the iron-based amorphous alloy through nanosecond laser irradiation under the atmospheric environment. The method utilizes the chemical reaction induced by laser irradiation and the melt flow effect, can prepare the nano-particle structure or the reticular nano-structure on the surface of the iron-based amorphous alloy by changing the laser irradiation parameters, has the advantages of economy, high efficiency, environmental protection, simple process flow and the like, and has potential application prospect in the fields of surface catalysis, waste liquid treatment, micro-nano optics, biomedicine and the like.
Description
Technical Field
The invention relates to the field of material surface micro-nano processing, in particular to a method for preparing an iron-based amorphous alloy surface nano structure by nanosecond laser irradiation, which has potential application prospects in the fields of surface catalysis, waste liquid treatment, micro-nano optics, biomedicine and the like.
Background
The amorphous alloy is formed by the super-quenching solidification of alloy melt, and has excellent mechanical, physical and chemical properties of common metals and glass. Since the advent of amorphous alloys, it has been a research hotspot in many fields. Researchers have successfully developed iron-based, zirconium-based, magnesium-based, copper-based and other amorphous alloy systems with different properties through component design and process optimization. Among them, the iron-based amorphous alloy has been widely used in the fields of power electronics, industrial catalysis, waste liquid treatment, etc. due to its excellent soft magnetic characteristics and good catalytic activity. Meanwhile, research shows that the performance of the material cannot be separated from the structure of the material on the nanometer scale. Therefore, the controllable preparation of the iron-based amorphous alloy surface nano structure is realized, and the important promotion effect is realized on the large-scale industrial application of the iron-based amorphous alloy surface nano structure.
Nanoimprint technology is a widely used method for preparing material surface nanostructures. However, although the method can be used for preparing the surface nano structure with ultra-high resolution, the method also has the problems of complex mold preparation process flow, difficult accurate control of etching process parameters, difficult demolding and the like. Laser processing is a processing method with strong universality, economy, high efficiency and environmental protection, and is gradually used for preparing a micro-nano structure on the surface of amorphous alloy in recent years. For example, after an amorphous alloy placed in an argon atmosphere is irradiated by nanosecond laser, a micro-convex structure with a diameter larger than 50 μm is formed in an irradiation region (Y.F. Qian, et al. On the transformation between micro-convex and micro-concave in nano-second laser pair of a Zr-based metallic glass, Journal of Manufacturing Processes, 68 (2021) 1114 1122), but the method utilizes the flow characteristics of the amorphous alloy melt at high temperature, the required laser energy and the number of laser pulses per unit time are high, and a nano-scale microstructure cannot be formed. When laser irradiation is performed in an atmospheric environment, an amorphous alloy sample may chemically react with surrounding gas to form nanoparticles that are difficult to wet. In the subsequent cooling process, along with the flowing of materials in the molten pool, the nano particles may flow along with the flowing of the materials in the molten pool to form a specific nano structure, so that the application of the amorphous alloy in the fields of surface catalysis, waste liquid treatment, micro-nano optics, biomedicine and the like is improved.
Disclosure of Invention
The invention aims to provide a method for preparing a nano structure on the surface of an iron-based amorphous alloy by nanosecond laser irradiation, which solves the problems in the prior art. According to the invention, by utilizing the chemical affinity of erbium element and oxygen element under the high-temperature condition and the mismatching of the formed compound and the wettability of the matrix, the nano-particle structure and the net-shaped nano-structure can be rapidly and efficiently prepared on the surface of the amorphous alloy by controlling the laser irradiation parameters, and the method has potential application prospects in the fields of surface catalysis, waste liquid treatment, micro-nano optics, biomedicine and the like.
The above object of the present invention is achieved by the following technical solutions:
the method for preparing the iron-based amorphous alloy surface nanostructure through nanosecond laser irradiation comprises the following steps of performing nanosecond laser irradiation on the iron-based amorphous alloy surface in an atmospheric environment, and inducing the iron-based amorphous alloy surface to form the nanostructure by utilizing the chemical affinity of erbium element and oxygen element under a high-temperature condition and the mismatching of a compound formed by the erbium element and the oxygen element and the wettability of a matrix, wherein the specific steps comprise:
(1) carrying out mechanical grinding and polishing treatment on the surface of the amorphous alloy sample, sequentially using absolute ethyl alcohol and acetone to carry out ultrasonic cleaning, and placing the cleaned amorphous alloy sample on a three-dimensional displacement platform;
(2) focusing laser on the surface of the amorphous alloy, performing line scanning on the surface of the amorphous alloy by using nanosecond pulse laser, and regulating and controlling the movement of nanoparticles in a molten pool by changing laser irradiation parameters so as to prepare a nanoparticle structure or a reticular nano structure on the surface of the amorphous alloy.
Further, the surface roughness R of the polished amorphous alloy sample in the step (1)a<10nm。
Further, the laser irradiation parameters in the step (2) are as follows: the laser wavelength is 532nm, the pulse width is 15.4ns, the repetition frequency is 1kHz, and the laser energy density is 0.85-1.89J/cm2The scanning speed was 1mm/s, and the laser energy distribution was Gaussian.
The invention has the beneficial effects that: by utilizing the chemical affinity of erbium element and oxygen element under the high temperature condition and the mismatching of the wettability of the compound formed by erbium element and oxygen element and the matrix, the nano-particle structure and the nano-network structure can be rapidly and efficiently prepared on the surface of the amorphous alloy by controlling the laser irradiation parameters. Compared with the prior art, the preparation method disclosed by the invention realizes the preparation of the amorphous alloy surface nanostructure, and has potential application prospects in the fields of surface catalysis, waste liquid treatment, micro-nano optics, biomedicine and the like.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention.
FIG. 1 is a schematic diagram of a nanosecond laser processing system according to the invention;
FIG. 2 is a scanning electron microscope image of the nano-particle structure on the surface of the amorphous alloy prepared by nanosecond laser irradiation in example 1 of the present invention;
FIG. 3 is a three-dimensional topographic image of the nano-particle structure on the surface of the amorphous alloy prepared by nanosecond laser irradiation in example 1 of the present invention;
FIG. 4 is a scanning electron microscope image of the amorphous alloy surface network nanostructure prepared by nanosecond laser irradiation in example 2 of the present invention;
FIG. 5 is a three-dimensional topographic image of the amorphous alloy surface network nanostructure prepared by nanosecond laser irradiation in example 2 of the present invention;
fig. 6 is an x-ray energy spectrum analysis (EDS) result of the nano-network structure on the surface of the amorphous alloy prepared by nanosecond laser irradiation in example 2 of the present invention.
Detailed Description
The details of the present invention and its embodiments are further described below with reference to the accompanying drawings.
Referring to fig. 1 to 6, the method for preparing the iron-based amorphous alloy surface nanostructure through nanosecond laser irradiation, provided by the invention, comprises the following steps: mechanically grinding and polishing the surface of the amorphous alloy; sequentially carrying out ultrasonic cleaning on the amorphous alloy in absolute ethyl alcohol and acetone; by utilizing the chemical affinity of erbium element and oxygen element under the high temperature condition and the mismatching of the formed compound and the wettability of the matrix, nano-structure is formed on the surface of the iron-based amorphous alloy through nanosecond laser irradiation under the atmospheric environment. The method utilizes the chemical reaction induced by laser irradiation and the melt flow effect, can prepare the nano-particle structure or the reticular nano-structure on the surface of the iron-based amorphous alloy by changing the laser irradiation parameters, has the advantages of economy, high efficiency, environmental protection, simple process flow and the like, and has potential application prospect in the fields of surface catalysis, waste liquid treatment, micro-nano optics, biomedicine and the like.
Referring to fig. 1 to 6, the method for preparing the iron-based amorphous alloy surface nanostructure through nanosecond laser irradiation provided by the invention comprises the following steps of performing nanosecond laser irradiation on the iron-based amorphous alloy surface in an atmospheric environment, and inducing the iron-based amorphous alloy surface to form the nanostructure by utilizing the chemical affinity of erbium element and oxygen element under a high-temperature condition and the mismatching of a compound formed by the erbium element and the oxygen element and the wettability of a matrix, wherein the method comprises the following specific steps:
(1) carrying out mechanical grinding and polishing treatment on the surface of the amorphous alloy sample, sequentially using absolute ethyl alcohol and acetone to carry out ultrasonic cleaning, and placing the cleaned amorphous alloy sample on a three-dimensional displacement platform;
(2) focusing laser on the surface of the amorphous alloy, performing line scanning on the surface of the amorphous alloy by using nanosecond pulse laser, and regulating and controlling the movement of nanoparticles in a molten pool by changing laser irradiation parameters so as to prepare a nanoparticle structure or a reticular nano structure on the surface of the amorphous alloy.
Further, the surface roughness R of the polished amorphous alloy sample in the step (1)a<10nm。
Further, the laser irradiation parameters in the step (2) are as follows: the laser wavelength is 532nm, the pulse width is 15.4ns, the repetition frequency is 1kHz, and the laser energy density is 0.85-1.89J/cm2The scanning speed was 1mm/s, and the laser energy distribution was Gaussian.
The following is Fe-based amorphous alloy (Fe)52Cr13Mo12C15B6Er2) The method for preparing the iron-based amorphous alloy surface nanostructure by nanosecond laser irradiation provided by the invention is used for illustrating the implementation process and the beneficial effects.
Example 1:
referring to fig. 2 and fig. 3, a scanning electron microscope image and a three-dimensional morphology image of the amorphous alloy surface nanoparticle structure prepared by nanosecond laser irradiation in this embodiment are shown. The selected laser energy density is 0.85J/cm2The scanning speed was 1 mm/s. It can be seen that the nanoparticles prepared in this example exhibited a dispersed state in the irradiated region,and the width of the nano-particles is not more than 700nm, and the height of the nano-particles is not more than 100 nm.
Example 2:
referring to fig. 4 and 5, a scanning electron microscope image and a three-dimensional morphology image of the amorphous alloy surface mesh nanostructure prepared by nanosecond laser irradiation in this embodiment are shown. The selected laser energy density is 1.39J/cm2The scanning speed was 1 mm/s. It can be seen that the mesh-like nano-structure prepared in this embodiment has a clear profile, and the line width of the mesh-like nano-structure is not more than 800nm and the height is not more than 100 nm.
FIG. 6 shows the results of x-ray energy spectrum analysis (EDS) of the amorphous alloy surface network nanostructure prepared under the experimental conditions of FIG. 4. It can be found that the content of erbium element and oxygen element in the reticular nano structure is obviously higher than that in other areas, which indicates that the nano structure formed under the action of laser irradiation is essentially erbium oxide.
According to the test results, the method provided by the invention is used for carrying out nanosecond laser irradiation on the surface of the iron-based amorphous alloy in an atmospheric environment, can be used for quickly and efficiently preparing a nano particle structure or a net-shaped nano structure on the surface of the amorphous alloy, and has potential application prospects in the fields of surface catalysis, waste liquid treatment, micro-nano optics, biomedicine and the like.
The above description is only a preferred example of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like of the present invention shall be included in the protection scope of the present invention.
Claims (2)
1. A method for preparing a nano structure on the surface of an iron-based amorphous alloy by nanosecond laser irradiation is characterized by comprising the following steps: nanosecond laser irradiation is carried out on the surface of the iron-based amorphous alloy in an atmospheric environment, a nano structure is formed on the surface of the iron-based amorphous alloy in an induced manner by utilizing the chemical affinity of erbium and oxygen under a high-temperature condition and the mismatching of a compound formed by the erbium and the oxygen and the wettability of a matrix, and the method specifically comprises the following steps:
(1) carrying out mechanical grinding and polishing treatment on the surface of the amorphous alloy sample, sequentially using absolute ethyl alcohol and acetone to carry out ultrasonic cleaning, and placing the cleaned amorphous alloy sample on a three-dimensional displacement platform;
(2) focusing laser on the surface of the amorphous alloy, performing line scanning on the surface of the amorphous alloy by using nanosecond pulse laser, and regulating and controlling the movement of nanoparticles in a molten pool by changing laser irradiation parameters so as to prepare a nanoparticle structure or a reticular nanostructure on the surface of the amorphous alloy; the laser irradiation parameters are as follows: the laser wavelength is 532nm, the pulse width is 15.4ns, the repetition frequency is 1kHz, and the laser energy density is 0.85-1.89J/cm2The scanning speed was 1mm/s, and the laser energy distribution was Gaussian.
2. The method for preparing the iron-based amorphous alloy surface nanostructure through nanosecond laser irradiation, according to claim 1, is characterized in that: the surface roughness R of the polished amorphous alloy sample in the step (1)a<10nm。
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