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Method for differential arc oxidation treatment of Nickel-titanium alloy for medical purpose

A nickel-titanium alloy, micro-arc oxidation technology, applied in medical science, electrolytic coating, surface reaction electrolytic coating, etc., to achieve the effect of enhancing biological safety, high biological safety, and not easy to peel off

Inactive Publication Date: 2007-10-31
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that there is no direct micro-arc oxidation treatment of medical NiTi alloy at home and abroad so far, and provide a method for medical NiTi alloy micro-arc oxidation treatment

Method used

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Experimental program
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specific Embodiment approach 1

[0008] Embodiment 1: The micro-arc oxidation treatment of the medical nickel-titanium alloy in this embodiment is carried out according to the following steps: (1) the surface of the medical nickel-titanium alloy is pretreated; (2) the pretreated medical nickel-titanium alloy is put into the working solution, The NiTi alloy is used as the positive electrode, the working tank is used as the negative electrode, and the temperature of the working fluid is controlled to be 10 to 40 °C. Treatment under the condition of ~3000Hz for 5 ~ 60min; (3) NiTi alloy is rinsed with distilled water for 3 to 4 times and then dried to obtain a medical nickel-titanium alloy whose surface is treated by micro-arc oxidation; wherein the working solution in step (2) is acidic. Or alkaline system, each liter of acidic system working solution includes 2-10 mL phosphoric acid, 1-10 g titanium dioxide and 10-100 mL ethanol, and alkaline system working solution is sodium silicate, sodium aluminate or sodiu...

specific Embodiment approach 2

[0011] Embodiment 2: The difference between this embodiment and Embodiment 1 is that step (1) surface pretreatment of medical nickel-titanium alloy is degreasing, SiC sandpaper grinding and ultrasonic cleaning in sequence. Other steps and selected parameters are the same as in the first embodiment.

specific Embodiment approach 3

[0012] Embodiment 3: The difference between this embodiment and Embodiment 1 is that in step (2), the working tank is made of stainless steel. Other steps and selected parameters are the same as in the first embodiment.

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Abstract

The invention discloses a method of medical nickel titanium alloy differential arc oxidation treatment, which comprises the following steps: (1) pre-treating surface; (2) putting into hydraulic fluid; choosing NiTi ally as positive pole and loading trough as negative pole; treating; (3)washing; drying; getting the product. This invention possesses simple method, which can inhibit discharging of Ni ion in nickel titanium alloy and reinforce safety.

Description

technical field [0001] The invention relates to a method for alloy micro-arc oxidation treatment. Background technique [0002] Nickel-titanium (NiTi) alloys are widely used in dentistry, orthopedics and cardiovascular medicine due to their excellent properties such as shape memory effect and superelasticity. However, the content of Ni in the medical NiTi alloy is high, and Ni accounts for 50.5% to 51.5% of the atomic percentage of the alloy. Research shows that after the medical NiTi alloy is implanted into the human body, Ni ions are precipitated due to the corrosion of the implant surface by body fluids. , the surface of the alloy is corroded to produce a loose reaction layer, which aggravates the wear of the material surface, and the wear debris generated by the wear will seriously affect the biological safety of the implant. As we all know, nickel is a biotoxic element, and Ni ions have potential carcinogenic effects. Therefore, the application and development of NiTi ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/26A61L27/06A61L31/02
Inventor 王福平刘福徐吉林于德珍辛铁柱
Owner HARBIN INST OF TECH
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