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Method for conducting femtosecond laser treatment on metal surface to optimize microwave band absorption performance

A metal surface, femtosecond laser technology, used in laser welding equipment, metal processing equipment, welding equipment and other directions, can solve the problems of heavy weight, thin volume, firm combination, difficult combination, etc., to avoid the use of materials, reduce production costs, good repeatability

Inactive Publication Date: 2017-08-11
CHANGCHUN UNIV OF SCI & TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

At present, most microwave absorbing materials are composite materials composed of microwave absorbers and polymer binders. This material is large in size and heavy in weight, and it is difficult to combine with shielding (or protection) objects, and it is easy to fall off during application.
It cannot fully meet the requirements of advanced absorbing materials for light weight, thin volume, and strong combination

Method used

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  • Method for conducting femtosecond laser treatment on metal surface to optimize microwave band absorption performance
  • Method for conducting femtosecond laser treatment on metal surface to optimize microwave band absorption performance
  • Method for conducting femtosecond laser treatment on metal surface to optimize microwave band absorption performance

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Embodiment 1

[0025] In this embodiment, the laser energy is 1 mJ, the scanning distance is 120 μm, and the scanning speed is 1 mm / s, and the surfaces of four kinds of metal samples are processed by means of long distance one-dimensional line scanning. Then the microwave reflectance of the sample was measured, as figure 2 As shown, as the microwave frequency increases, the reflectance of the four laser-treated metal surfaces all form their own absorption peaks. The absorption peak of Ti is at 14GHz, the absorption rate is 18.9%, the absorption peak of Al is at 10.7GHz, the absorption rate is 30.9%, the absorption peak of Fe is at 10.7GHz, the absorption rate is 19.1%, and the absorption peak of Ni is at 12.6 At GHz, the absorption rate is 14.7%. Surface morphology changes such as image 3 As shown, a one-dimensional micro-grating structure is formed. As we all know, the smooth metal surface has almost no microwave absorption, and the experimental results show that after laser femtosecon...

Embodiment 2

[0027] In the example, three different laser scanning methods are used to process the surface of nickel metal: method one (one-dimensional line scanning at a long distance), the same as the method in example 1; method two (orthogonal line scanning), two scans The specific method is to carry out two line scans vertically on the sample surface under the same condition of the starting point, and the laser parameters and scanning parameters are consistent with the previous single scan (parameters in Example 1); Line scanning), adopt compact scanning, the specific method is to reduce the scanning distance to make it smaller than the spot size, so that the upper and lower scanning overlap to realize laser irradiation processing, the experimental parameters are E=1.62mJ, d=0.04mm, v= 4mm / s. The microwave reflectivity measurement results are as follows Figure 4 As shown, it can be seen that compared with the absorption peak of the microwave reflectivity obtained after the treatment ...

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Abstract

The invention provides a method for conducting femtosecond laser treatment on a metal surface to optimize microwave band absorption performance and belongs to the field of metal surface function modification. By means of the method, a femtosecond laser focusing scanning treatment manner is conducted on the surface of a solid base, and optimization of the microwave performance of a treated micro-nano structure surface is achieved. By means of the method, large-area and fast surface microwave performance modification can be effectively achieved on a solid surface. Compared with a traditional method, the method has the beneficial effects that lightness, thinness and solidness are achieved; and meanwhile, laser processing also has multiple beneficial effects of being environment-friendly, capable of achieving automatic production and the like.

Description

technical field [0001] The invention relates to the field of metal surface functional modification, in particular to a method for modifying the microwave absorption function of a femtosecond laser metal surface. Background technique [0002] In recent years, with the rapid development of electronic information technology, wireless devices in various GHz frequency bands have become increasingly diverse and widely used in people's daily life, bringing various conveniences to people. At the same time, this "electronic smog" composed of electromagnetic waves hidden in the atmosphere also brings a lot of harmful radiation to people, becoming a new invisible pollution, seriously affecting people's life and health, or affecting some people Interference with instruments sensitive to electromagnetic waves. Microwave absorbing materials can absorb and attenuate incident electromagnetic waves, which can effectively alleviate the harm and interference caused by microwave radiation. Th...

Claims

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Application Information

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IPC IPC(8): B23K26/00B23K26/352
CPCB23K26/352B23K26/355
Inventor 陶海岩宋晓伟林景全王硕
Owner CHANGCHUN UNIV OF SCI & TECH
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