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Method for preparing titanium-alloy surface micro-arc oxidation antifriction compound film layer

A technology of micro-arc oxidation and composite film layer, which is applied in the direction of surface reaction electrolytic coating, coating, electrolytic coating, etc., can solve the problems of increased preparation cost, plastic deterioration, high solution requirements, etc., to meet the requirements of high-quality clean production and friction reduction The effect of obvious effect and simple raw materials

Inactive Publication Date: 2011-04-20
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, due to the existence of the passivation film on the surface of the titanium alloy, a weak interface bond is formed between the base alloy and the coating, and the titanium alloy has been regarded as a "difficult-to-plate material"; It is not easy, and the hardness is low, and the requirements for the solution are high. At present, it is only used in decorative coatings; PVD / CVD, ion implantation and thermal oxidation methods need to maintain high temperatures during the coating preparation process, which changes the substrate and the coating to a certain extent. The structure of the coating significantly deteriorates the mechanical properties of the substrate (deterioration of plasticity); PVD / CVD and ion implantation methods require expensive vacuum or atmosphere protection conditions, and the preparation cost is significantly increased; while the thermal oxidation method consumes a lot of energy, takes a long time and Labor-intensive, resulting in uneven coating

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] The sample to be processed is TC4 titanium alloy, with a size of 25mm×20mm×3mm flakes. The specific operation steps are as follows:

[0014] (1) Sample pretreatment: the sample is subjected to 240 # -800 # The sandpaper was polished in turn, washed with water, degreased by ultrasonic waves in acetone solution for 1 hour, washed with deionized water, and dried for later use.

[0015] (2) Preparation of composite membrane: The micro-arc oxidation electrolyte is based on the sodium silicate-sodium hexametaphosphate system, which is 8g / L sodium silicate, 6g / L sodium hexametaphosphate, and 1.5g / L MoS 2 particle. The pretreated titanium alloy sample is used as the anode, and the stainless steel electrolytic cell is also used as the cathode, and the micro-arc oxidation treatment is performed on the surface of the titanium alloy with a DC pulse micro-arc oxidation power supply device; the current density is 8A / dm 2 , the frequency is 500Hz, the duty cycle is 60%, and the ele...

Embodiment 2

[0017] The sample to be processed is TC4 titanium alloy, with a size of 25mm×20mm×3mm flakes. The specific operation steps are as follows:

[0018] (1) Sample pretreatment: the sample is subjected to 240 # -800 # The sandpaper was polished in turn, washed with water, degreased by ultrasonic waves in acetone solution for 1 hour, washed with deionized water, and dried for later use.

[0019] (2) Preparation of composite membrane: The micro-arc oxidation electrolyte is based on the sodium silicate-sodium hexametaphosphate system, which is sodium silicate 8g / L, sodium hexametaphosphate 6g / L, and graphite 1.5g / L particle. The pretreated titanium alloy sample is used as the anode, and the stainless steel electrolytic cell is also used as the cathode, and the micro-arc oxidation treatment is performed on the surface of the titanium alloy with a DC pulse micro-arc oxidation power supply device; the current density is 8A / dm 2 , the frequency is 500Hz, the duty cycle is 60%, and the ...

Embodiment 3

[0021] The sample to be processed is TC4 titanium alloy, with a size of 25mm×20mm×3mm flakes. The specific operation steps are as follows:

[0022] (1) Sample pretreatment: the sample is subjected to 240 # -800 # The sandpaper was polished in turn, washed with water, degreased by ultrasonic waves in acetone solution for 1 hour, washed with deionized water, and dried for later use.

[0023] (2) Preparation of composite membrane: The micro-arc oxidation electrolyte is based on the sodium silicate-sodium hexametaphosphate system, which is sodium silicate 8g / L, sodium hexametaphosphate 6g / L, sodium aluminate 1.5g / L L, 1.5g / L MoS 2 particle. The pretreated titanium alloy sample is used as the anode, and the stainless steel electrolytic cell is also used as the cathode, and the micro-arc oxidation treatment is performed on the surface of the titanium alloy with a DC pulse micro-arc oxidation power supply device, and the current density is 8A / dm 2 , the frequency is 500Hz, the du...

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Abstract

The invention relates to a method for preparing a titanium-alloy surface micro-arc oxidation antifriction compound film layer, which is characterized by comprising the following steps of: (1) micro-arc oxidation of an electrolyte; and (2) preparation of a compound film. The invention has the technical effects that: 1. the method provided by the invention is used for preparing the micro-arc oxidation compound film layer with an antifriction effect by introducing a solid lubricant and experimenting on a one-step method in the titanium-alloy micro-arc oxidation process on the premise of not destroying a micro-arc oxidation film layer, and the antifriction effect is remarkable; and 2. the composition raw materials of a sodium-silicate system electrolyte adopted by the invention are simply and easily obtained, a solution is neutral or weakly alkaline, the solution does not contain heavy metal ions, such as chromium ions and the like or environment-friendly constraint elements and does not contain substances harmful to human bodies and environments, the environmental pollution is small, and the requirements of high-quality clean production are satisfied.

Description

technical field [0001] The invention relates to a preparation method of a composite film layer, in particular to a preparation method of a titanium alloy surface micro-arc oxidation friction-reducing composite film layer. Background technique [0002] Titanium and its alloys are widely used as structural metals in aviation, aerospace, military industry, chemical industry, metallurgy, petroleum, electric power, seawater due to their low density, high specific strength, good corrosion resistance, superconductivity, and hydrogen storage properties. Many industries such as desalination, construction, ships, textiles, medical materials and daily necessities are known as "modern metals", "third metals" and "strategic metals". The disadvantages of titanium alloys are low hardness, poor wear resistance, and low high temperature oxidation resistance. The surface of titanium is easy to produce pits, and its friction coefficient is large. In the process of use, severe friction will ge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/26
Inventor 赵晴朱文辉邵志松
Owner NANCHANG HANGKONG UNIVERSITY
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