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Micro-arc oxidation process for reducing surface friction coefficient of titanium alloy

A technology of micro-arc oxidation and surface friction, which is applied in the direction of surface reaction electrolytic coating, electrolytic coating, coating, etc., can solve the problems of reducing the friction coefficient of titanium alloy surface, and achieve strong bonding force, low friction coefficient and high hardness. Effect

Inactive Publication Date: 2008-10-08
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the most widely used micro-arc oxidation technology is to form micro-arc oxidation ceramic films on magnesium and aluminum alloys. It is less used on titanium alloys. There are fewer studies on the use of this technology to reduce the surface friction coefficient of titanium alloys.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Embodiment one: (1) chemical degreasing: degreasing uses conventional chemical degreasing formula:

[0014] Sodium hydroxide (NaOH) 30g / L

[0015] Sodium phosphate (Na3PO4·12H2O) 30g / L

[0016] Sodium carbonate (Na2CO3) 20g / L

[0017] Sodium silicate (Na2SiO3) 3g / L

[0018] Total alkalinity (equivalent to NaOH) 40g / L

[0019] Temperature 70°C-90°C

[0020] Time 10min-20min

[0021] After the degreased parts are thoroughly cleaned with water, the continuity of the water film on the surface of the parts should be checked. If the entire metal surface is hydrophilic, there are no water droplets and non-infiltrated parts, the degreasing is considered qualified;

[0022] (2) Micro-arc oxidation: use titanium wire as the fixture, and make it into the required shape to ensure good contact between the fixture and the test piece during the micro-arc oxidation reaction process. During this process, since the temperature of the spark discharge solution is easy to rise, and th...

Embodiment 2

[0024] Embodiment two: (1) chemical degreasing: degreasing uses conventional chemical degreasing formula:

[0025] Sodium hydroxide (NaOH) 50g / L

[0026] Sodium phosphate (Na3PO4·12H2O) 50g / L

[0027] Sodium carbonate (Na2CO3) 30g / L

[0028] Sodium silicate (Na2SiO3) 10g / L

[0029] Total alkalinity (equivalent to NaOH) 80g / L

[0030] Temperature 70°C-90°C

[0031] Time 10min-20min

[0032] After the degreased parts are thoroughly cleaned with water, the continuity of the water film on the surface of the parts should be checked. If the entire metal surface is hydrophilic, there are no water droplets and non-infiltrated parts, the degreasing is considered qualified;

[0033] (2) Micro-arc oxidation: use titanium wire as the fixture, and make it into the required shape to ensure good contact between the fixture and the test piece during the micro-arc oxidation reaction process. During this process, since the temperature of the spark discharge solution is easy to rise, and t...

Embodiment 3

[0035] Embodiment three: (1) chemical degreasing: degreasing uses conventional chemical degreasing formula:

[0036] Sodium hydroxide (NaOH) 40g / L

[0037] Sodium phosphate (Na3PO4·12H2O) 40g / L

[0038] Sodium carbonate (Na2CO3) 25g / L

[0039] Sodium silicate (Na2SiO3) 6.5g / L

[0040] Total alkalinity (equivalent to NaOH) 60g / L

[0041] Temperature 70°C-90°C

[0042] Time 10min-20min

[0043] After the degreased parts are thoroughly cleaned with water, the continuity of the water film on the surface of the parts should be checked. If the entire metal surface is hydrophilic, there are no water droplets and non-wetting parts, it is considered that the degreasing is qualified.

[0044](2) Micro-arc oxidation: use titanium wire as the fixture, and make it into the required shape to ensure good contact between the fixture and the test piece during the micro-arc oxidation reaction process. During this process, since the temperature of the spark discharge solution is easy to ri...

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Abstract

Disclosed is micro-arc oxidation process to reduce the friction coefficient of titanium alloy surface, which has the process steps of (1) the chemical degreasing, (2) the micro-arc oxidation that the basic parameters are trisodium phosphate of 1-30g / L, tungsten sodium of 0-10g / L, sodium silicate of 0-50g / L, tartaric acid of 0-20g / L, glycerol of 0-10g / L and sodium hydroxide of 5-10g / L, (3) the post-processing that the hot oil immersion treatment is proceeded for the film after the oxidation. Through the invention, the high-performance ceramic membrane with strong cementing property, high hardness and low coefficient friction can be obtained on the titanium surface. Through the testing of a high-temperature friction and wear testing machine of MM-U5G screen material end surface, the friction coefficient of the titanium micro-arc oxidation film is 0.1 to 0.5. During the observation of the oxidation film after the experiment, the shedding and wear phenomenon is not found.

Description

technical field [0001] The invention relates to a material surface treatment process, in particular to a micro-arc oxidation process for reducing the friction coefficient of the titanium alloy surface. Background technique [0002] Titanium alloy has high specific strength and good corrosion resistance. It not only replaces aluminum alloy, magnesium alloy and steel components in aero-engines, but also has been widely used in advanced aircraft, such as various titanium alloy parts on Su-27 aircraft. The weight accounts for about 15% of the weight of the aircraft structure; the total weight of titanium alloy parts on the third-generation fighter F-14 and F-15 of the United States accounts for 24% and 27% of the weight of the aircraft structure respectively, while the fourth-generation fighter F- The amount of titanium alloy on 22 has reached 41%. In addition to a large number of applications in the aviation field, titanium alloys are also increasingly used in daily life, such...

Claims

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Application Information

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IPC IPC(8): C25D11/26C23G1/10
Inventor 赵晴邵志松冯长杰王春霞周海飞陈宁
Owner NANCHANG HANGKONG UNIVERSITY
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