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Preparation method of self-lubricating wear-resistant coating on surfaces of titanium and titanium alloy

A wear-resistant coating and titanium alloy technology, applied in the direction of surface reaction electrolytic coating, coating, electrolytic coating, etc., can solve the problems of low surface hardness, poor wear resistance and high friction coefficient of titanium and titanium alloys, and achieve low Good coefficient of friction, good bonding strength, and excellent stain resistance

Inactive Publication Date: 2014-01-08
SHENYANG LIGONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is the low surface hardness of titanium and titanium alloys, poor wear resistance caused by high friction coefficient, etc., to provide a self-lubricating composite surface of titanium and titanium alloys with high bonding strength and surface hardness and low friction coefficient coating preparation process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Polish the surface of pure titanium (TA2) with 600-mesh sandpaper to remove large-scale defects on the surface and ensure the accuracy of the treated surface;

[0021] (2) Under the action of ultrasonic waves, use acetone for 3 minutes to remove oil, impurities, etc.;

[0022] (3) Sodium acetate-sodium silicate electrolyte is used, and the processing parameters are: current density 1A / dm 2 ~5A / dm 2 , voltage 350V~500V, duty cycle 20~50%, temperature 0~40℃, positive and negative pulse width 500μs, pulse-to-pulse 1000μs, processing time 5~20min, the surface of the component that will be treated in step (2) Perform micro-arc oxidation treatment to prepare a ceramic coating;

[0023] (4) Immerse in 50~80g / L polytetrafluoroethylene solution at 50~70℃, keep for 30min, take it out, and dry it in the air.

[0024] (5) Using a heat treatment furnace, heat the sample soaked in PTFE to 120°C and keep it for 15 minutes; then raise the temperature to 345°C and keep it for 30 ...

Embodiment 2

[0026] (1) Choose titanium alloy (TC4), grind it with a grinding wheel, remove burrs and defects, and ensure the accuracy of the treated surface;

[0027] (2) Use 80~100℃ hot alkali solution to clean the surface of titanium alloy parts treated by (1) for more than 10 minutes to remove oil stains and impurities;

[0028] (3) Using phosphoric acid-sodium silicate electrolyte, the surface of the parts treated in step (2) is subjected to micro-arc oxidation treatment to prepare a ceramic coating; the processing parameters are: current density 2A / dm 2 ~10A / dm 2 , voltage 400V~500V, duty cycle 20~50%, temperature 0~60℃, positive and negative pulse width 500μs, pulse-to-pulse 1000μs, processing time 5~30min,

[0029] Others are the same as embodiment 1.

[0030] The thickness of the coating prepared by this method is 10-40 μm, the microhardness of the coating surface is between 350-800Hv, the coating surface is smooth and compact without defects such as pores and cracks formed by m...

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Abstract

The invention belongs to the technical field of surface treatment, and discloses a preparation method of a high-hardness self-lubricating wear-resistant composite coating on the surfaces of titanium and titanium alloy. The wear-resistant coating structure is composed of a hard ceramic phase formed by micro-arc oxidation and a low-friction-coefficient polytetrafluoroethylene filling phase. The method comprises the steps that: grinding is carried out, and the surfaces of titanium and titanium alloy are cleaned, such that surface oil stains and impurities are removed; titanium and titanium alloy are subjected to a micro-arc oxidation treatment, such that the hard ceramic phase with high hardness, low pore size, and high porosity is prepared; with a hot-dip process, polytetrafluoroethylene is filled on spaces, cracks, and surface of the ceramic coating; and with a heat treatment, the ceramic phase and polytetrafluoroethylene is fused together. With the method, the high-hardness and low-friction-coefficient wear-resistant composite coating can be prepared on the surface of titanium alloy, and the coating surface is flat and uniform. The coating has good corrosion 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, in particular to a preparation method of a metal self-lubricating wear-resistant composite coating on the titanium alloy surface. Background technique [0002] Titanium and titanium alloys have the advantages of low density, good corrosion resistance, and high specific strength, and are widely used in aerospace, chemical, biomedical and other fields. However, titanium and titanium alloys have low surface hardness, high friction coefficient, poor friction and wear resistance, and are especially sensitive to fretting wear; under the action of friction, mechanical parts are prone to heat, adhesion, seizure and high temperature oxidation, resulting in plasticity and strength. Decrease; and crevice corrosion will occur in high-concentration corrosive media, which seriously limits its application range. Traditional surf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/26
Inventor 赵晖王小辉李玉海
Owner SHENYANG LIGONG UNIV
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