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Method for preparing TiCN coating layer in situ on surface of titanium alloy

An in-situ preparation and titanium alloy technology, applied in the direction of metal material coating process, coating, solid-state diffusion coating, etc., can solve the problems of low bonding force of TiCN coating, poor corrosion resistance, slow growth of coating, etc., to achieve Good corrosion resistance, simplified preparation process, and fast coating growth

Active Publication Date: 2018-07-06
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the methods for preparing TiCN layer on the surface of titanium alloy mainly include electroless plating, thermal spraying, and vacuum magnetron sputtering. Although the strength is good, the coating is not dense, resulting in poor corrosion resistance; the bonding force of the TiCN coating prepared by magnetron sputtering is generally low, and because the carbon source used is CH 4 Or the graphite target leads to slow growth of the coating, high internal stress, and the thickness of the prepared coating is low (1 μm ~ 3 μm)

Method used

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  • Method for preparing TiCN coating layer in situ on surface of titanium alloy
  • Method for preparing TiCN coating layer in situ on surface of titanium alloy
  • Method for preparing TiCN coating layer in situ on surface of titanium alloy

Examples

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Embodiment 1

[0021] This embodiment includes the following steps:

[0022] Step 1. Mechanically clean the surface of the titanium alloy workpiece (Ti-6Al-4V) to be treated until the surface roughness of the titanium alloy workpiece is less than 3.2 μm, and then evenly apply a layer of Vaseline paste. The thickness of the Vaseline paste is controlled at 40 μm ;

[0023] Step 2, the area where the titanium alloy workpiece described in step 1 is coated with vaseline paste is under the protection of nitrogen atmosphere, the pressure of nitrogen is 0.1MPa, placed in the laser action area of ​​the pulsed YAG laser, the lens focal length of the pulsed YAG laser is selected for use 183mm , turn on the power supply of the pulsed YAG laser, and carry out laser irradiation on the area where the titanium alloy workpiece is coated with vaseline paste. During the laser irradiation process, the output pulse width of the pulsed YAG laser is controlled to be 200ns, and the frequency is 400kHz. It is 200mm...

Embodiment 2

[0027] This embodiment includes the following steps:

[0028] Step 1. Mechanically clean the surface of the titanium alloy workpiece (Ti-6Al-4V) to be treated until the surface roughness of the titanium alloy workpiece is less than 3.2 μm, and then evenly apply a layer of Vaseline paste. The thickness of the Vaseline paste is controlled at 10 μm ;

[0029] Step 2, the area where the titanium alloy workpiece described in step 1 is smeared with vaseline paste is under the protection of a nitrogen atmosphere, the pressure of nitrogen is 0.2MPa, placed in the laser action area of ​​the pulsed YAG laser, and the focal length of the lens of the pulsed YAG laser is selected 183mm , turn on the power supply of the pulsed YAG laser, and carry out laser irradiation on the area where the titanium alloy workpiece is coated with vaseline paste. During the laser irradiation process, the output pulse width of the pulsed YAG laser is controlled to be 100 ns, and the frequency is 1000 kHz. 20...

Embodiment 3

[0032] This embodiment includes the following steps:

[0033] Step 1. Mechanically clean the surface of the titanium alloy workpiece (Ti-4Al-0.005B) to be treated until the surface roughness of the titanium alloy workpiece is less than 3.2 μm, and then evenly apply a layer of Vaseline paste. The thickness of the Vaseline paste is controlled at 160μm;

[0034] Step 2, the area where the titanium alloy workpiece described in step 1 is coated with vaseline paste is under the protection of nitrogen atmosphere, the pressure of nitrogen is 0.5MPa, placed in the laser action area of ​​the pulsed YAG laser, the lens focal length of the pulsed YAG laser is selected 183mm , turn on the power supply of the pulsed YAG laser, and carry out laser irradiation on the area where the titanium alloy workpiece is coated with vaseline paste. During the laser irradiation process, the output pulse width of the pulsed YAG laser is controlled to be 20ns, and the frequency is 200kHz. It is 1600mm / s, t...

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Abstract

The invention discloses a method for preparing a TiCN coating layer in situ on the surface of titanium alloy. The method comprises the following steps: mechanically cleaning the surface of a titaniumalloy workpiece until the surface roughness of the titanium alloy workpiece is smaller than 3.2 microns, and uniformly smearing the titanium alloy workpiece with a layer of vaseline paste; and (2) putting the region, smeared with the vaseline paste, of the titanium alloy workpiece below a pulse YAG laser under the protection of nitrogen atmosphere, switching on a power supply of the pulse YAG laser to realize laser irradiation on the region, smeared with the vaseline paste, of the titanium alloy workpiece, and finally cleaning and airing, so as to obtain the TiCN coating layer on the surface of the titanium alloy workpiece. The method is simple, the thickness of the TiCN coating layer is mainly controlled according to the thickness of the smeared vaseline paste and the laser power, and thevaseline paste is taken as a carbon source, so that the cost is low, a process microcell environment can be isolated during the reaction on the surface, and the surface oxidation of the titanium alloy can be prevented.

Description

technical field [0001] The invention belongs to the technical field of metal material surface treatment, and in particular relates to a method for in-situ preparation of a TiCN coating on the surface of a titanium alloy. Background technique [0002] Titanium alloy has the characteristics of low density, high specific strength and excellent mechanical properties, and has been widely used in aerospace, petrochemical, shipbuilding, automobile, medicine and other fields. In the field of medical devices, micro-arc oxidation treatment of titanium alloys with excellent biocompatibility with the human body can be used to obtain porous biological coatings that are easy to attach to tissue cells; in the petrochemical and shipbuilding industries, pulse anodization of titanium alloy surfaces The oxide layer, which is about a few microns thick, can isolate the galvanic corrosion problem caused by the connection of dissimilar metals. [0003] At present, with the large number of applica...

Claims

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Application Information

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IPC IPC(8): C23C8/74C23C8/30
CPCC23C8/30C23C8/74
Inventor 李斌林小辉
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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