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Preparation method of NiTi shape memory alloy with porous surface

A memory alloy, surface porous technology, applied in the direction of surface reaction electrolytic coating, pharmaceutical formula, anodic oxidation, etc., can solve the problem of not belonging to the valve metal, achieve low Ni content, accelerate the bone healing process, and promote the effect of exchange

Active Publication Date: 2015-03-11
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Since the NiTi alloy contains a large amount of Ni elements, it does not belong to the category of valve metals, and there are only a few literatures reporting on the anodic oxidation of NiTi.

Method used

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  • Preparation method of NiTi shape memory alloy with porous surface
  • Preparation method of NiTi shape memory alloy with porous surface
  • Preparation method of NiTi shape memory alloy with porous surface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The surface modification of medical NiTi shape memory alloy was carried out according to the following steps

[0036] Step 1: NiTi alloy surface pretreatment, followed by degreasing, SiC sandpaper grinding, mechanical polishing and ultrasonic cleaning;

[0037] Step 2: Anodizing treatment, put the NiTi alloy after ultrasonic cleaning into the electrolyte, use the NiTi alloy as the positive electrode, and the graphite plate as the negative electrode, and control the temperature of the electrolyte to 30°C±5°C, using a DC stabilized power supply, in Anodizing treatment under the condition of constant voltage 35V for 90min; wherein, the electrolyte is a mixture of ammonium fluoride and ammonium sulfate with glycerol, ethylene glycol and deionized water as solvents, the concentrations of which are 0.3 mol / liter and 0.2 mol / L;

[0038] Step 3: Rinse with deionized water and then dry naturally to obtain a NiTi shape memory alloy with interconnected surface and porous surface ...

Embodiment 2

[0044] The surface modification of medical NiTi shape memory alloy was carried out according to the following steps

[0045] Step 1: NiTi alloy surface pretreatment, followed by degreasing, SiC sandpaper grinding, mechanical polishing and ultrasonic cleaning;

[0046]Step 2: Anodizing treatment, put the NiTi alloy after ultrasonic cleaning into the electrolyte, use the NiTi alloy as the positive electrode, and the graphite plate as the negative electrode, and control the temperature of the electrolyte to 30°C±5°C, using a DC stabilized power supply, in Anodizing treatment under the condition of constant voltage 40V for 90min; wherein, the electrolyte is a mixture of ammonium fluoride and ammonium sulfate with glycerol, ethylene glycol and deionized water as solvents, and the concentrations are 0.2 mol / liter and 0.2 mol / L;

[0047] Step 3: Rinse with deionized water and then dry naturally to obtain a NiTi shape memory alloy with interconnected surface and porous surface modifi...

Embodiment 3

[0051] The surface modification of medical NiTi shape memory alloy was carried out according to the following steps

[0052] Step 1: NiTi alloy surface pretreatment, followed by degreasing, SiC sandpaper grinding, mechanical polishing and ultrasonic cleaning;

[0053] Step 2: Anodizing treatment, put the NiTi alloy after ultrasonic cleaning into the electrolyte, use the NiTi alloy as the positive electrode, and the graphite plate as the negative electrode, and control the temperature of the electrolyte to 30°C±5°C, using a DC stabilized power supply, in Anodizing treatment under the condition of constant voltage 50V for 90 minutes; wherein, the electrolyte is a mixture of ammonium fluoride and ammonium sulfate prepared with glycerol, ethylene glycol and deionized water as solvents, and the concentrations are 0.1 mol / liter respectively and 0.2 mol / L;

[0054] Step 3: Rinse with deionized water and then dry naturally to obtain a NiTi shape memory alloy with interconnected surfa...

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Abstract

The invention provides a preparation method of NiTi shape memory alloy with a porous surface. The preparation method adopts a one-step anodic oxidation method, and specifically comprises the following steps: (1) surface pretreatment: grinding and polishing the NiTi shape memory alloy to make the NiTi shape memory alloy smooth; (2) anodic oxidation: using a two-electrode system, using the NiTi shape memory alloy after the surface pretreatment as an anode and graphite as a cathode in electrolyte, and applying certain voltage between the anode and the cathode so as to oxidize the anode. The NiTi shape memory alloy prepared by the preparation method has a titanium dioxide porous layer with the thickness of 5-7 microns on the surface, the porous layer has a unique communicated porous structure, and the pore size distribution is uniform; the Ni content of the porous layer is very low.

Description

technical field [0001] The invention belongs to the field of surface modification of alloy materials, in particular to an anodic oxidation method for obtaining a connected porous oxide layer on the surface of a NiTi shape memory alloy. Background technique [0002] Compared with other medical metals, NiTi shape memory alloy with nearly equal atomic ratio has unique shape memory effect and superelasticity. In addition, its elastic modulus is the closest to that of human hard tissue, which can improve its mechanical compatibility with human bones. At present, NiTi has successfully obtained clinical applications in the fields of dentistry, orthopedics and cardiovascular surgery. However, when it is implanted into the human body, in the process of contacting with body fluids, lymph, etc., the surface is easy to release biologically toxic Ni 2+ In addition, as an implant material in vivo, NiTi itself does not have biological activity, that is, it cannot directly combine with bon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/34C25D11/26A61L27/06A61L27/50A61L31/02A61L31/14
CPCA61L27/06A61L27/306A61L27/56A61L31/022A61L31/088A61L31/146A61L2400/18A61L2420/02A61L2430/02A61L2430/12C25D11/26C25D11/34
Inventor 金学军孔祥确金明江李伟
Owner SHANGHAI JIAO TONG UNIV
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