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Method for preparing ceramic wear-resisting layer with high finish on titanium alloy surface by employing micro-arc oxidation method and micro-arc oxidation solution

A ceramic wear-resistant layer, micro-arc oxidation technology, applied in the direction of surface reaction electrolytic coating, coating, electrolytic coating, etc., can solve the problems of surface roughness deterioration, affecting the dimensional accuracy of parts, etc. Low consumption and the effect of solving looseness and brittleness

Active Publication Date: 2014-06-11
BAOJI SANXIAN NON FERROUS METAL MFG
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The purpose of the present invention is to provide a micro-arc oxidation preparation method of high-gloss ceramic wear-resistant layer on titanium alloy surface, to overcome the deterioration of surface roughness in the process of preparing ceramic film layer for titanium and titanium alloy precision parts in the prior art. Dimensional accuracy of parts

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  • Method for preparing ceramic wear-resisting layer with high finish on titanium alloy surface by employing micro-arc oxidation method and micro-arc oxidation solution

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Configuration solution: Na 2 SO 4 3g / L; NaPO 4 5 / L; NaCl3 / L; H 2 o 2 1ml / L; alkylphenol polyoxyethylene ether 0.1g / L, the above solute was added to deionized water and stirred evenly to obtain a micro-arc oxidation solution, which was poured into a reaction tank for use.

[0031] The titanium alloy sample is a TA2 test piece, the surface is mechanically polished to a surface roughness of less than Ra3.2μm, after degreasing and cleaning, the titanium alloy wire is used to clamp firmly, the titanium alloy wire is connected to the titanium part as the anode, and connected to the positive electrode of the micro-arc oxidation power supply. A stainless steel plate is used as the cathode, which is connected to the negative electrode of the micro-arc oxidation power supply.

[0032] The micro-arc oxidation process controls the pulse frequency to 100Hz; the duty cycle is 80%; by adjusting the boost rate, the average current is controlled to 1A / dm 2 ; Termination voltage sho...

Embodiment 2

[0035] Configuration solution: Na 2 SO 4 20g / L; NaPO 4 10 / L; NaCl5 / L; H 2 o 2 1ml / L; sorbitan fat 1g / L; fatty alcohol polyoxyethylene 1g / L, add the above solutes into deionized water and stir evenly to obtain a micro-arc oxidation solution, which is poured into a reaction tank for use.

[0036] The titanium alloy sample is TC4 test piece, the surface is mechanically polished to a surface roughness of less than Ra3.2μm, after degreasing and cleaning, it is clamped firmly with titanium alloy wire, the titanium alloy wire is connected to the titanium part as the anode, and connected to the positive electrode of the micro-arc oxidation power supply. A stainless steel plate is used as the cathode, which is connected to the negative electrode of the micro-arc oxidation power supply.

[0037] The micro-arc oxidation process controls the pulse frequency to 500Hz; the duty cycle is 60%; by adjusting the boost rate, the average current is controlled to 6A / dm 2 ; Termination voltage...

Embodiment 3

[0040] Configuration solution: Na 2 SO 4 30g / L; NaPO 4 20 / L; NaCl10 / L; H 2 o 2 3ml / L; fatty alcohol polyoxyethylene ether 5g / L, the above solute was added to deionized water and stirred evenly to obtain a micro-arc oxidation solution, which was poured into a reaction tank for use.

[0041] The titanium alloy sample is selected from TC21 test piece, the surface is mechanically polished to a surface roughness of less than Ra3.2μm, after degreasing and cleaning, it is clamped firmly with titanium alloy wire, the titanium alloy wire is connected to the titanium part as the anode, and connected to the positive electrode of the micro-arc oxidation power supply. A stainless steel plate is used as the cathode, which is connected to the negative electrode of the micro-arc oxidation power supply.

[0042] The micro-arc oxidation process controls the pulse frequency to 600Hz; the duty cycle is 80%; by adjusting the boost rate, the average current is controlled to 9A / dm 2 ; Terminati...

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Abstract

The invention discloses a method for preparing a ceramic wear-resisting layer with high finish on a titanium alloy surface by employing a micro-arc oxidation method. The method comprises a micro-arc oxidation solution and a micro-arc oxidation process. The solution comprises the following main ingredients: Na2SO4, NaPO4, NaCl, H2O2 and an additive, the micro-arc oxidation process adopts a direct current pulse electrification mode, the voltage output is a standard rectangular square wave or a single-polarity sine wave, and the ceramic wear-resisting layer with high finish is prepared by controlling the parameters such as the pulse frequency, the duty ratio and the pressure rise rate on a titanium and titanium alloy surface. An even and compact oxide ceramic membrane is generated under a stable pulse discharge condition, the mean roughness of the grown ceramic wear-resisting layer can be up to Ra0.25mum under the condition of controlling the initial roughness of the titanium alloy surface to be smaller than Ra3.2mum, meanwhile, the hardness of the ceramic layer is greater than 700Hv, the ceramic wear-resisting layer has good wear-resisting property, and the dimensional accuracy of the size is not affected.

Description

technical field [0001] The invention relates to a method for preparing a ceramic wear-resistant layer with high smoothness on the surface of titanium alloy by micro-arc oxidation. By adopting the method, a smooth and dense wear-resistant ceramic film layer can be prepared on the surface of titanium and titanium alloy without affecting the assembly accuracy of parts. Background technique [0002] Titanium and titanium alloys have high specific strength and excellent corrosion resistance, and are widely used in aerospace, navigation, petrochemical and other fields. However, titanium alloys have low surface hardness and poor wear resistance. The surface hardness of titanium and titanium alloys is usually not If it exceeds 340Hv, adhesive wear is prone to occur during use, causing groove wear marks, and eventually the parts fail, which limits the application range of titanium alloys in hydraulic components and precision-sized components. There are many ways to improve the wear r...

Claims

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Application Information

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IPC IPC(8): C25D11/26
Inventor 刘海峰刘海玉
Owner BAOJI SANXIAN NON FERROUS METAL MFG
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