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Process for preparing composite coating of hydroxyapatite and porous titanium dioxide on biomedical titanium metal surface

A technology of porous titanium dioxide and hydroxyapatite, applied in coatings, medical science, prostheses, etc., can solve the problems of low bonding strength between the coating and the substrate interface, affecting the use effect, and easy cracking, etc., to achieve low cost and high performance. Biological activity, effect of improving binding ability

Inactive Publication Date: 2012-07-11
HARBIN INST OF TECH
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  • Summary
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hydroxyapatite has excellent biocompatibility and can be used as a bone or tooth inducing factor to induce bone growth. However, it is very difficult to coat hydroxyapatite on the surface of medical titanium and titanium alloys. The commonly used method is Plasma spraying method, but this method has low bonding strength between the hydroxyapatite coating and the substrate interface, and is easy to crack, which greatly affects its use effect. Therefore, a new coating technology of hydroxyapatite on the surface of medical titanium has been developed. very important

Method used

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  • Process for preparing composite coating of hydroxyapatite and porous titanium dioxide on biomedical titanium metal surface
  • Process for preparing composite coating of hydroxyapatite and porous titanium dioxide on biomedical titanium metal surface
  • Process for preparing composite coating of hydroxyapatite and porous titanium dioxide on biomedical titanium metal surface

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specific Embodiment approach 1

[0019] Embodiment 1: The method for preparing a composite coating of hydroxyapatite and porous titanium dioxide on the surface of medical titanium metal in this embodiment includes the following two steps:

[0020] Step 1: Do micro-arc oxidation, place pure titanium or titanium alloy in a stainless steel tank containing alkaline electrolyte, use pure titanium or titanium alloy as anode, and stainless steel tank as cathode; during the oxidation process, the cooling system controls the bath liquid The temperature is less than 50°C; using a bipolar pulse power supply, through the control of the electrical parameters of the micro-arc oxidation and the time of the micro-arc oxidation, the breakdown discharge of the titanium surface forms a layer of porous titanium dioxide coating on the titanium surface with a micron-scale pore size ;

[0021] Step 2: Put the porous titanium dioxide coating after micro-arc oxidation into a closed reaction kettle filled with liquid by hydrothermal m...

specific Embodiment approach 2

[0029] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the energy of the micro-arc oxidation process is provided by an adjustable high-voltage and high-frequency bipolar pulse power supply, the pulse voltage is 200-500V, the frequency is 400-800Hz, The duty ratio is 4-20%, and the solution temperature is 0-50°C. Within the above selected electrical parameters of the micro-arc oxidation, the thickness of the coating can reach 3-4 microns after micro-arc oxidation for 5 minutes. Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0030] Embodiment 3: This embodiment is different from Embodiment 2 in that the micro-arc oxidation time is 10 minutes, and the thickness of the coating can reach 5-6 microns. Other steps are the same as in the second embodiment.

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Abstract

A process for preparing a composite coating of hydroxyapatite and porous titanium dioxide on the biomedical titanium metal surface belongs to the technical field of metal surface modification. Compared with other technologies of coating titanium surface bioactive coating, the process prepares the a composite coating of hydroxyapatite and porous titanium dioxide on the biomedical titanium matrix surface in situ, thereby the adhesion of titanium matrix substitutes implanted into the body and bone tissues is remarkably improved. The process includes the following steps of, firstly, placing titanium or titanium alloy into a stainless steel groove containing an alkaline electrolyte, using a bipolar impulsing power source, controlling micro-arc oxidation electrical parameters and micro-arc oxidation time, enabling the titanium surface to form a porous titanium dioxide coating by a disruptive discharge of the titanium surface; secondly, putting the coating into a reactor containing liquid through a hydro-thermal method, thereby the hydroxyapatite can grow in situ of the biomedical titanium matrix surface in situ. The process for preparing a composite coating of hydroxyapatite and porous titanium dioxide on the biomedical titanium metal surface is simple in operation, high in controllability and low in manufacturing cost, and can introduce non-toxic substances into the coating.

Description

technical field [0001] The invention belongs to the technical field of metal surface modification, and in particular relates to a method for preparing a composite coating of hydroxyapatite and porous titanium dioxide on the surface of medical titanium metal. Background technique [0002] As an important biomedical material, medical titanium metal has high mechanical strength, high toughness and excellent fatigue resistance, and is widely used in the replacement of hard tissues such as joints, teeth, and bones in the human body. However, there are generally problems such as poor biological activity, low binding strength, and long healing time when implanted into the human body. In order to improve the biological activity of medical titanium metal and promote its combination with human bone tissue, in recent years, the surface modification of medical titanium metal and the preparation of biologically active titanium surface coatings have become research hotspots. Hydroxyapati...

Claims

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Application Information

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IPC IPC(8): C25D11/26A61L27/32A61L27/06
Inventor 魏大庆成夙周玉
Owner HARBIN INST OF TECH
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