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Method for preparing biological ceramic membrane layer on titanium alloy surface through graded combined oxidation in stages

A bioceramic membrane and composite oxidation technology, which is applied in the field of metallurgy, can solve the problems of affecting the quality of the film layer, affecting the performance of the film layer, ablation of the oxide film layer, etc., and achieves the benefits of control, low cost, and increased thickness of the dense layer. Effect

Active Publication Date: 2015-10-21
KUNMING METALLURGY INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the micro-area arc discharge stage of the micro-arc oxidation process, if the oxidation time is too long and the working voltage is too large, it will cause the oxide film to be ablated, which will affect the quality of the film, thereby affecting the performance of the film.

Method used

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  • Method for preparing biological ceramic membrane layer on titanium alloy surface through graded combined oxidation in stages
  • Method for preparing biological ceramic membrane layer on titanium alloy surface through graded combined oxidation in stages

Examples

Experimental program
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Effect test

Embodiment 1

[0033] A. Pretreatment: Cut the titanium alloy TC4 into a cylindrical titanium material, punch a hole above the sample, and polish the surface of the titanium alloy until there are no obvious scratches on the surface of the sample, and then dry it for later use.

[0034] B. Staged composite micro-arc oxidation: The pretreated titanium alloy sample is suspended in the electrolyte as the anode, and the stainless steel electrolytic cell is used as the cathode to perform staged micro-arc oxidation. The electrolyte formula is: the concentration of calcium acetate is 17g / L, the concentration of disodium hydrogen phosphate is 12g / L, and the concentration of EDTA-2Na is 17g / L. The power supply parameters are: in the anodizing stage of micro-arc oxidation, the forward voltage is set to 165V, the negative voltage is 0~40V, the positive and negative duty cycle is 10%, the frequency is 100Hz, and the number of positive and negative pulses is 1~5. In the anodic oxidation stage of micro-arc...

Embodiment 2

[0038] A. Pretreatment: Cut the titanium alloy TC4 into a cylindrical titanium material, punch a hole above the sample, and polish the surface of the titanium alloy until there are no obvious scratches on the surface of the sample, and then dry it for later use.

[0039]B. Staged composite micro-arc oxidation: The pretreated titanium alloy sample is suspended in the electrolyte as the anode, and the stainless steel electrolytic cell is used as the cathode to perform staged micro-arc oxidation. The electrolyte formula is: the concentration of calcium acetate is 30g / L, the concentration of disodium hydrogen phosphate is 16g / L, and the concentration of EDTA-2Na is 30g / L. The power supply parameters are: in the anodic oxidation stage of micro-arc oxidation, the forward voltage is set to 165V, the negative voltage is 20V, the positive and negative duty cycle is 30%, the frequency is 500Hz, the number of positive and negative pulses is 3, and the micro-arc oxidation In the anodic ox...

Embodiment 3

[0043] A. Pretreatment: Cut the titanium alloy TC4 into a cylindrical titanium material, punch a hole above the sample, and polish the surface of the titanium alloy until there are no obvious scratches on the surface of the sample, and then dry it for later use.

[0044] B. Staged composite micro-arc oxidation: The pretreated titanium alloy sample is suspended in the electrolyte as the anode, and the stainless steel electrolytic cell is used as the cathode to perform staged micro-arc oxidation. The electrolyte formula is: the concentration of calcium acetate is 45g / L, the concentration of disodium hydrogen phosphate is 25g / L, and the concentration of EDTA-2Na is 45g / L. The power supply parameters are: in the anodic oxidation stage of micro-arc oxidation, the forward voltage is set to 165V, the negative voltage is 40V, the positive and negative duty cycle is 45%, the frequency is 1000Hz, the number of positive and negative pulses is 5, and the micro-arc oxidation In the anodic ...

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Abstract

The invention discloses a method for preparing a biological ceramic membrane layer on the titanium alloy surface through combined oxidation in stages. The method comprises the steps of pretreatment, combined micro-arc oxidation in stages and posttreatment, wherein the step of combined micro-arc oxidation in stages is implemented by adjusting electrical parameters; electrical parameter adjustment includes prolonging the time of the anodic oxidation stage in the micro-arc oxidation process, increasing the thickness of a compact layer of an oxidation film layer, improving the corrosion resistance of titanium alloy, solving the problem that since the compact layer of the oxidation film layer is thin, metal ions drifts are freed to a base body to cause an adverse reaction between the implanted body and the base body when the micro-arc oxidation film is implanted into a living body as a medical material, increasing the working voltage so that an insulative anode oxide film can be broken through more easily and appropriately shortening the discharge time of microcell arc light in the micro-arc oxidation process so as to prevent the situation that holes formed in the surface at the early stage are covered with melt sprayed at the later stage due to too long discharge time of the arc light.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for preparing bioceramic film layers by compound oxidation in stages on the surface of titanium alloys. Background technique [0002] At present, research at home and abroad shows that micro-arc oxidation includes the following four basic processes: ordinary anodic oxidation process; spark discharge stage; micro-arc discharge stage and arc discharge stage. In the first stage, in the early stage of oxidation, the system composed of alloy and electrolyte follows Faraday's law, the voltage and current on the surface of the alloy compound Ohm's law and an oxide insulating layer can be formed on the surface. As the voltage increases, a large amount of gas is precipitated on the surface of the alloy, and the oxide film layer becomes porous due to the overflow of gas. In the second stage, as the applied voltage increases, the porous oxide film layer is broken do...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/26
Inventor 杨钢吴云峰倪尔鑫严继康孙彦华
Owner KUNMING METALLURGY INST
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