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Gradient anti-friction and wear-resistant coating on titanium alloy surface and preparation method thereof

A technology of wear-resistant coating and titanium alloy, which is applied in the direction of surface reaction electrolytic coating, device for coating liquid on the surface, coating, etc., can solve the problems of poor wear resistance and achieve good bonding strength, high hardness, The effect of surface densification

Active Publication Date: 2018-10-12
NANJING UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problems of poor wear resistance caused by low surface hardness and high friction coefficient of titanium and titanium alloys, the present invention provides a self-lubricating composite coating on the surface of titanium and titanium alloys with high bonding strength, high surface hardness and low friction coefficient and its Preparation Process

Method used

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  • Gradient anti-friction and wear-resistant coating on titanium alloy surface and preparation method thereof
  • Gradient anti-friction and wear-resistant coating on titanium alloy surface and preparation method thereof
  • Gradient anti-friction and wear-resistant coating on titanium alloy surface and preparation method thereof

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preparation example Construction

[0029] A method for preparing a metal-based oxide ceramic coating / organic polymer coating composite coating on the surface of a titanium alloy, comprising:

[0030] (1) Use sandpaper or grinding wheels with a particle size of less than 600 mesh to polish the surface of titanium and titanium alloy parts to remove defects with large surface sizes, so that the surface roughness is lower than 0.1; use a polishing cloth to polish the surface of titanium and titanium alloy parts to form a mirror surface.

[0031] (2) Use a chemical solution containing 20-30g / L of nitric acid and 10-15g / L of hydrofluoric acid to fully clean titanium and titanium alloys at 25-35°C for 5-10 minutes, and then use ethanol to clean them for 10 minutes under the action of ultrasonic waves. After more than a minute, take it out, rinse it under running water, and dry it.

[0032] (3) Use sodium aluminate-sodium phosphate system, or sodium silicate-sodium phosphate system electrolyte; use non-ionic surfactant...

Embodiment 1

[0038] (1) Polish the titanium alloy (TC4) surface with sandpaper of 120 mesh, 200 mesh, 400 mesh, and 600 mesh in sequence to remove larger defects on the surface so that the surface roughness is lower than 0.1; use a polishing cloth to polish until the mirror surface appears .

[0039] (2) Under the action of ultrasonic waves, use ethanol to ultrasonically clean for 10 minutes to remove oil stains and impurities on the surface;

[0040] (3) Prepare a sodium silicate-sodium phosphate electrolyte; use ultra-high molecular weight polyethylene with a particle size of 600 mesh as a solvent for the dispersion and organic solution; use Tween 40 as a dispersant to prepare an ultra-high molecular weight polyethylene dispersion. After the dispersion liquid was stirred for 2 hours, it was mixed with the electrolyte solution, and subjected to plasma electrolytic oxidation treatment;

[0041] (4) The processing parameters of plasma electrolytic oxidation are: current density 2A / dm 2 , ...

Embodiment 2

[0046] (1) Polish the surface of pure titanium (TC4) with sandpaper of 120 mesh, 200 mesh, 400 mesh, and 600 mesh in sequence to remove large defects on the surface so that the surface roughness is lower than 0.1; use a polishing cloth to polish until the mirror surface appears .

[0047] (2) Under the action of ultrasonic waves, use ethanol to ultrasonically clean for 10 minutes to remove oil stains and impurities on the surface;

[0048] (3) Prepare a sodium silicate-sodium phosphate electrolyte; use ultra-high molecular weight polyethylene with a particle size of 700 mesh as a solvent for the dispersion and organic solution; use Tween 60 as a dispersant to prepare an ultra-high molecular weight polyethylene dispersion. After the dispersion liquid was stirred for 2 hours, it was mixed with the electrolyte solution, and subjected to plasma electrolytic oxidation treatment;

[0049] (4) The processing parameters of plasma electrolytic oxidation are: current density 2A / dm 2 ,...

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Abstract

The invention discloses a titanium and titanium alloy surface self-lubricating antiwear coating layer and a preparation method thereof. The coating layer is an oxidized ceramic coating layer, wherein ultra-high molecular weight polyethylene particles are evenly distributed in pores of the coating layer, an ultra-high molecular weight polyethylene film is formed on the surface of the coating layer, and the thickness of the ultra-high molecular weight polyethylene film is 10-20 microns. The coating layer is prepared by means of a lifting-pulling film forming method, the surface of the prepared coating layer is compact, smooth and even, and an ultra-high molecular weight polyethylene coating layer in direct contact with the outside is corrosion resistant, hydrophobic and outstanding in pollution resistance.

Description

technical field [0001] The invention belongs to the technical field of surface treatment, and relates to a titanium alloy surface coating strengthening treatment technology, in particular to a titanium alloy surface gradient friction-reducing and wear-resistant coating and a preparation method thereof. Background technique [0002] Titanium and titanium alloys have the advantages of low density, good corrosion resistance, and high strength, and have been widely used in aerospace, chemical industry, and biological materials. Although the tensile strength of titanium alloy after heat treatment is as high as 900-1000MPa, which is comparable to that of high-strength steel, its hardness is lower, about 2 / 3 of that of high-strength steel (the hardness of high-strength steel is HV500-600), and the friction coefficient is relatively low. Large (0.5-0.7), poor wear resistance, thus severely limiting the scope of application of titanium alloys. Traditional surface coating treatment p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/26B05D1/18
CPCB05D1/18C25D11/26
Inventor 熊党生金琦童张荣初刘昀彤孙卫国王琨闻小明秦永坤
Owner NANJING UNIV OF SCI & TECH
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