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Method for preparing bio-ceramic film on surface of magnesium/magnesium alloy through micro-arc oxidation

A bioceramic membrane and micro-arc oxidation technology, which is applied in the field of medical metal implant materials, can solve problems such as unsatisfactory biocompatibility, and achieve good versatility, low cost, and improved corrosion resistance

Inactive Publication Date: 2012-01-04
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the prepared micro-arc oxidation ceramic film has been significantly improved in terms of corrosion resistance, hardness, wear resistance, etc., however, its compatibility with organisms is not ideal.

Method used

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  • Method for preparing bio-ceramic film on surface of magnesium/magnesium alloy through micro-arc oxidation
  • Method for preparing bio-ceramic film on surface of magnesium/magnesium alloy through micro-arc oxidation
  • Method for preparing bio-ceramic film on surface of magnesium/magnesium alloy through micro-arc oxidation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Use deionized water as a solvent to prepare a phosphate and silicate composite system solution, containing 30 g of sodium phosphate, 10 g of sodium silicate, 5 g of calcium glycerophosphate, 5 g of potassium carbonate, 2 g of borax, and 2 g of hydrogen per liter of the composite system solution. Sodium oxide adjusts the pH value of the composite system solution to be 8, and then the composite system solution is placed in the electrolytic cell and left to stand for 24 hours as the electrolyte;

[0031] (2) Magnesium to be treated is placed in the electrolyte described in step (1) as an anode, the stainless steel plate is used as a cathode, the temperature of the control electrolyte is 10°C, and the pulse frequency of the micro-arc oxidation power supply (DC pulse power supply) is adjusted to 600Hz , the duty ratio is 15%, and the voltage is 350V under the condition of constant voltage treatment for 30min, that is, a layer of uniform and dense bioceramic film is grown ...

Embodiment 2

[0035] (1) Use deionized water as a solvent to prepare a phosphate and silicate composite system solution, containing 25 g of sodium phosphate, 10 g of sodium silicate, 10 g of calcium glycerophosphate, 10 g of potassium carbonate, 5 g of borax, and 5 g of hydrogen per liter of the composite system solution. Sodium oxide adjusts the pH value of the composite system solution to 10, and then the composite system solution is placed in the electrolytic cell and left for 24 hours as the electrolyte;

[0036](2) the magnesium alloy to be treated is placed in the electrolyte described in step (1) as an anode, the stainless steel plate is used as a cathode, the temperature of the control electrolyte is 15°C, and the pulse frequency of the micro-arc oxidation power supply (DC pulse power supply) is adjusted to 550Hz, duty ratio 20%, constant voltage treatment for 5min under the condition of voltage 350V, that is to grow a layer of uniform and dense bioceramic film on the surface of magn...

Embodiment 3

[0040] (1) Use deionized water as a solvent to prepare a phosphate and silicate composite system solution, containing 40 g of sodium phosphate, 2 g of sodium silicate, 30 g of calcium glycerophosphate, 1 g of potassium carbonate, 8 g of borax, and Sodium oxide adjusts the pH value of the composite system solution to 14, and then the composite system solution is placed in an electrolytic cell and left to stand for 24 hours as an electrolyte;

[0041] (2) Magnesium to be treated is placed in the electrolyte described in step (1) as an anode, the stainless steel plate is used as a cathode, the temperature of the control electrolyte is 45°C, and the pulse frequency of the micro-arc oxidation power supply (DC pulse power supply) is adjusted to 2000Hz , the duty ratio is 10%, and the voltage is 400V under the condition of constant voltage treatment for 3 minutes, that is, a layer of uniform and dense bioceramic film is grown in situ on the magnesium surface.

[0042] In this example...

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Abstract

The invention discloses a method for preparing a bio-ceramic film on the surface of magnesium / magnesium alloy through micro-arc oxidation. The composite system solution of phosphate and silicate is used as electrolyte, magnesium or magnesium alloy is placed in the electrolyte to be used as an anode, a stainless steel plate is used as a cathode, the temperature of the electrolyte is controlled at 10-45 DEG C, the pulse frequency is adjusted to 100-2000 Hz, the duty cycle is 10-55%, and constant pressure treatment is performed for 3-120 min under voltage of 250-500V to grow a uniform and dense bio-ceramic film on the surface of magnesium or magnesium alloy in situ. By adopting the method, the uniform and dense bio-ceramic film can be fast obtained on the surface of magnesium or magnesium alloy; and the method does not have special demands on the material, shape, size and the like of magnesium or magnesium alloy, and has good generality.

Description

technical field [0001] The invention belongs to the technical field of medical metal implant materials, in particular to a method for preparing bioceramic membranes by micro-arc oxidation on the surface of magnesium and magnesium alloys. Background technique [0002] At present, the medical metal implant materials that have been used clinically mainly include three categories: stainless steel, cobalt-based alloys and titanium-based alloys, all of which are biologically inert materials. After clinical application, the above-mentioned medical metal materials have shown some disadvantages, such as wear debris generated by friction in the body and soluble ions generated by corrosion in the body fluid environment. These wear debris and soluble ions will produce certain biological toxicity, cause local allergic reaction or inflammation, and even lead to implant failure. The mechanical properties, especially the modulus of elasticity, cannot match that of human bone tissue, which ...

Claims

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Application Information

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IPC IPC(8): C25D11/30
Inventor 陈宏郝建民郝一鸣
Owner CHANGAN UNIV
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