Method for preparing biologically active titanium dioxide film on NiTi alloy surface

A titanium oxide film, bioactive technology, applied in the field of surface bioactivation, can solve problems such as harsh conditions, achieve good biocompatibility, simplify the process, and expand the scope of application

Inactive Publication Date: 2012-04-25
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims to solve the existing technical problem of using concentrated phosphoric acid as the electrolyte to use NiTi alloys in a micro-arc oxidation method with harsh conditions, and to provide a preparation method for the biologically active titanium oxide film on the surface of NiTi alloys

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  • Method for preparing biologically active titanium dioxide film on NiTi alloy surface
  • Method for preparing biologically active titanium dioxide film on NiTi alloy surface
  • Method for preparing biologically active titanium dioxide film on NiTi alloy surface

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specific Embodiment approach 1

[0013] Specific embodiment one: the preparation method of the bioactive titanium oxide film layer on the surface of the NiTi alloy of the present embodiment is carried out according to the following steps: the concentrated sulfuric acid with a mass concentration of 98% is used as the electrolyte, the NiTi alloy is used as the positive electrode, and the stainless steel tank is used as the negative electrode. When the electrolyte temperature is 0℃~10℃, the current density is 1A / dm 2 ~20A / dm 2 1. Micro-arc oxidation under the condition of a voltage of 50V-70V for 2min-10min to obtain a biologically active titanium oxide film on the surface of the NiTi alloy.

[0014] In this embodiment, concentrated sulfuric acid with strong passivation is used as electrolyte to carry out micro-arc oxidation on NiTi alloy, and the pre-passivation layer formed on the surface of NiTi alloy by concentrated sulfuric acid is an important condition for determining whether the later spark discharge can...

specific Embodiment approach 2

[0015] Specific embodiment 2: This embodiment differs from specific embodiment 1 in that the NiTi alloy is used as the positive electrode and the stainless steel tank is used as the negative electrode. The temperature of the electrolyte is 2°C to 8°C, and the current density is 5A / dm. 2 ~18A / dm 2 , Micro-arc oxidation under the condition of voltage 55V~65V for 3min~8min. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0016] Embodiment 3: This embodiment is different from Embodiment 1 in that the NiTi alloy is used as the positive electrode and the stainless steel tank is used as the negative electrode. The temperature of the electrolyte is 4°C and the current density is 12A / dm. 2 , Micro-arc oxidation under the condition of voltage 60V for 6min. Others are the same as in the first embodiment.

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Abstract

The invention relates to a method for preparing a biologically active titanium dioxide film on a NiTi alloy surface, relating to a method for modification of a medical NiTi alloy surface and solving the technical problems of harsh conditions for micro-arc oxidation of the NiTi alloy with concentrated phosphoric acid as electrolyte in the prior art. In the method for preparing the biologically active titanium dioxide film on the NiTi alloy surface, concentrated sulfuric acid with the mass concentration being 98 percent is used as electrolyte, NiTi alloy is used as an anode, and a stainless steel tank is used as a cathode for micro-arc oxidation to obtained the biologically active titanium dioxide film on the NiTi alloy surface, or alkali treatment is carried out after micro-arc oxidation. By adopting the method, the titanium oxide film with a nanoscale porous structure and good biocompatibility can be prepared on the NiTi alloy surface, and the film and a substrate have high bonding strength of more than 45MPa. Moreover, the method is simple and can be used in clinical areas such as orthopedic surgery, department of stomatology, cardiovascular department, gynecology and the like.

Description

technical field [0001] The invention relates to a method for modifying the surface of a medical NiTi alloy, in particular to a method for its surface bioactivation. Background technique [0002] NiTi shape memory alloy (SMA) has a unique shape memory effect and superelasticity, good biocompatibility, corrosion resistance and mechanical properties, is an ideal biomedical material, widely used in the field of biomedical materials, has been It is used in orthopedics, stomatology, cardiovascular, gynecology and other clinical fields. Compared with other medical metal materials, the elastic modulus of NiTi shape memory alloy is the closest to that of human hard tissue, which improves its mechanical compatibility with human bones and can reduce the stress shielding of traditional metal materials after implantation Effect, avoiding bone loosening and implant falling off, and improving the comfort of patients after surgery. However, NiTi alloy itself is a biologically inert materi...

Claims

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Application Information

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IPC IPC(8): C25D11/26
Inventor 王海瑞刘福王福平
Owner HARBIN INST OF TECH
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