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Method for preparing periodic microstructure on surface of titanium alloy through nanosecond laser irradiation

A laser irradiation and titanium alloy technology, applied in laser welding equipment, welding equipment, manufacturing tools, etc., can solve problems such as difficult periodic structure, uncontrollable partial flow of melt, and evaporation phenomenon, achieving good repeatability, The effect of low processing cost and high efficiency

Active Publication Date: 2021-07-16
JILIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For the interaction between nanosecond lasers and materials, thermal effects are inevitable, which leads to uncontrollable local flow and evaporation of the melt, and it is difficult to prepare regular periodic structures on the surface of materials.

Method used

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  • Method for preparing periodic microstructure on surface of titanium alloy through nanosecond laser irradiation
  • Method for preparing periodic microstructure on surface of titanium alloy through nanosecond laser irradiation
  • Method for preparing periodic microstructure on surface of titanium alloy through nanosecond laser irradiation

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Embodiment 1

[0035] The following titanium alloys are preferably Ti6Al4V, which is one of the most widely used titanium alloys and is used in machinery, aerospace, biomedical and other fields, but other types of titanium alloys can also be used.

[0036] (1) Wire-cut the Ti6Al4V raw material into a square sample of 20mm×20mm×3mm, mechanically grind and polish the Ti6Al4V sample, and use absolute ethanol to perform ultrasonic cleaning for 5min. The cleaning temperature of ultrasonic cleaning is 50°C. Let dry naturally.

[0037] (2) Place the treated Ti6Al4V sample in the gas chamber, open the gas valve, and feed high-purity nitrogen gas at a gas flow rate of 5L / min. The laser beam is irradiated vertically on the surface of the titanium alloy sample through the silica glass.

[0038](3) Adjust the parameters of the nanosecond laser, set the laser power to 4.46W through the control software, the laser scanning speed to 10mm / s, the laser repetition frequency to 700kHz, the laser pulse width t...

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Abstract

The invention relates to a method for preparing a periodic microstructure on the surface of a titanium alloy through nanosecond laser irradiation, and belongs to the field of laser surface modification. The method comprises the following steps that 1, the surface of the titanium alloy is pretreated, a pretreated titanium alloy sample is placed in a gas cavity, nitrogen is conveyed through a gas inlet, the gas cavity is filled with the nitrogen, and the nitrogen flow is 1-20 L / min; 2, after 10-15 seconds of gas pre-supply, a nanosecond fiber laser device is turned on, and a focused laser beam is vertically irradiated on the surface of the titanium alloy sample through silicon dioxide glass; and 3, the periodic microstructure is prepared on the surface of the titanium alloy by controlling laser parameters, and meanwhile, the laser nitriding effect is achieved. According to the method, the wettability of the surface of the titanium alloy can be improved, and the regulation and control of the surface color can be realized; and in addition, due to the action of laser nitriding, the hardness and the wear resistance of the titanium alloy surface after laser irradiation are improved. The method for preparing the periodic microstructure is simple and good in repeatability, and the prepared structure has excellent durability.

Description

technical field [0001] The invention relates to the technical field of metal surface modification, in particular to a method for preparing a periodic microstructure on the surface of a titanium alloy by nanosecond laser irradiation. Background technique [0002] Titanium alloys have excellent mechanical, physical and chemical properties, such as high specific strength, low density, good high temperature retention, excellent corrosion resistance and biocompatibility, and are widely used in national defense, aerospace, biological medicine and other fields. However, some inherent shortcomings of itself, such as high friction coefficient, low hardness and wear resistance, etc., limit the scope of industrial application to a certain extent. [0003] Preparation of material surface microstructure can improve surface wettability, optical properties, biocompatibility, friction and wear properties, etc. Obviously, the preparation of microstructure on the surface of titanium alloy wi...

Claims

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Application Information

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IPC IPC(8): B23K26/352B23K26/60B23K26/70
CPCB23K26/355B23K26/60B23K26/702
Inventor 黄虎王超洪婧崔明明钱永峰
Owner JILIN UNIV
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