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Method and device for preparing fine-grain Ti3Al/TiN gradient coatings on titanium and titanium alloy surfaces

A gradient coating and titanium alloy technology, which is applied in the direction of metal material coating process, coating, superimposed layer plating, etc., can solve the problems of coarse grain of nitride layer, large surface roughness, complicated preparation process, etc. Achieve the effects of small friction coefficient and wear scar depth, uniform transition of coating structure and good coating quality

Inactive Publication Date: 2017-07-14
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The object of the invention is to provide a kind of titanium and titanium alloy surface to prepare fine-grained Ti 3 Al / TiN gradient coating method and device, thereby solving the traditional Ti in the prior art 3 Al / TiN preparation process is complex, time-consuming, high cost, easy to produce cracks on the surface, large surface roughness, easy deformation of the substrate and coarse grains of the nitride layer

Method used

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  • Method and device for preparing fine-grain Ti3Al/TiN gradient coatings on titanium and titanium alloy surfaces
  • Method and device for preparing fine-grain Ti3Al/TiN gradient coatings on titanium and titanium alloy surfaces
  • Method and device for preparing fine-grain Ti3Al/TiN gradient coatings on titanium and titanium alloy surfaces

Examples

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Effect test

Embodiment 1

[0039] First, provide a titanium alloy substrate (Ti-6Al-4V) with a thickness of 6mm as the workpiece substrate 10, perform ultrasonic cleaning on its surface, and perform surface roughening treatment. The roughening treatment uses a surface sanding device with an air injection pressure of 0.2 Mpa, the roughened particles used are Al 2 o 3 Particles, the nozzle is 5cm away from the sample surface. use as figure 1 In the shown device, firstly, the workpiece substrate 10 is fixed on the ultrasonic vibration platform 1, and the ultrasonic vibration platform 1 is placed in the sealed box 8 by opening the soft silica gel plate shell 9, and the vacuum is pumped, and the inside of the sealed box 8 is vacuumized. After the air is completely exhausted, a vacuum environment is formed, and then high-purity nitrogen is continuously introduced into the sealed box 8 through the nitrogen delivery pipeline 7, and the inflation time is > 5 minutes, so that the sealed box 8 is filled with nit...

Embodiment 2

[0045] Firstly, a titanium alloy substrate (Ti-6Al-4V) with a thickness of 6mm is provided as the workpiece substrate 10, and its surface is chemically ultrasonically cleaned, and the surface is roughened. A surface sanding device is used for the roughening treatment, and the air jet pressure is 0.2Mpa, the roughened particles used are Al 2 o 3 Particles, the nozzle is 5cm away from the sample surface. use as figure 1 In the shown device, the workpiece substrate 10 is fixed on the ultrasonic vibration platform 1, the ultrasonic vibration platform 1 is placed in the sealed box 8, and vacuumized. After the air in the sealed box 8 is completely discharged, a vacuum environment is formed, and then Continuously feed high-purity nitrogen into the sealed box 8 through the nitrogen delivery pipeline 7, and fill the sealed box 8 with nitrogen for more than 5 minutes; then turn on the ultrasonic generator 2, and wait until the power of the ultrasonic generator 2 reaches 100W , turn o...

Embodiment 3

[0047] Firstly, a titanium alloy substrate (Ti-6Al-4V) with a thickness of 6mm is provided as the workpiece substrate 10, and its surface is chemically ultrasonically cleaned, and the surface is roughened. A surface sanding device is used for the roughening treatment, and the air jet pressure is 0.2Mpa, the roughened particles used are Al 2 o 3 Particles, the nozzle is 5cm away from the sample surface. use as figure 1 In the shown device, the workpiece substrate 10 is fixed on the ultrasonic vibration platform 1, the ultrasonic vibration platform 1 is placed in the sealed box 8, and vacuumized. After the air in the sealed box 8 is completely discharged, a vacuum environment is formed, and then Continuously feed high-purity nitrogen into the sealed box 8 through the nitrogen delivery pipeline 7, and fill the sealed box 8 with nitrogen for more than 5 minutes; then turn on the ultrasonic generator 2, and wait until the power of the ultrasonic generator 2 reaches 100W , turn o...

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Abstract

The invention provides a method for preparing fine-grain Ti3Al / TiN gradient coatings on titanium and titanium alloy surfaces. The method includes the steps that under the nitrogen atmosphere, laser scanning processing, synchronous in-situ aluminum powder feeding and ultrasonic vibration treatment are simultaneously conducted on the titanium and titanium alloy surfaces of workpiece substrates, so that the fine-grain Ti3Al / TiN gradient coatings are prepared on the titanium and titanium alloy surfaces. The invention further provides a device for preparing the fine-grain Ti3Al / TiN gradient coatings on the titanium and titanium alloy surfaces. The method has the advantages that operation is easy and convenient, locating heating can be achieved, contact processing is avoided, a needed preparation time is short, and the depths of the Ti3Al / TiN gradient coatings are controllable. Compared with the prior art, the prepared fine-grain Ti3Al / TiN gradient coatings have the advantages of being free of air holes and cracks, having low surface roughness, achieving grain refinement, having high hardness and good wear-corrosion resistance, being reduced in surface residual stress and the like.

Description

technical field [0001] The invention relates to the field of surface modification of titanium and titanium alloys, and more specifically relates to the preparation of fine-grained Ti on the surface of titanium and titanium alloys. 3 Method and apparatus for Al / TiN gradient coating. Background technique [0002] As we all know, titanium and titanium alloys have the advantages of high specific strength, high fatigue strength, good corrosion resistance and good biocompatibility, and have good mechanical properties under high temperature and low temperature conditions, and some titanium alloys also have memory, superconductivity , hydrogen storage and other special functions. Among them, Ti6Al4V alloy has good comprehensive properties and excellent mechanical properties, and has been widely used in aerospace, biomedicine, chemical industry and other fields. However, titanium alloy itself also has disadvantages, such as low hardness and poor wear resistance, which severely limi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C28/00C23C24/10C23C8/24
CPCC23C28/36C23C8/24C23C24/106
Inventor 张显程李铸国付尧宿冠群涂善东
Owner EAST CHINA UNIV OF SCI & TECH
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