A kind of preparation method of surface porous niti shape memory alloy

A memory alloy, surface porous technology, applied in pharmaceutical formulations, anodizing, coatings, etc., can solve problems such as non-valve metal, and achieve the effects of low Ni content, promotion of exchange, and uniform pore size distribution

Active Publication Date: 2017-01-25
SHANGHAI JIAOTONG 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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  • A kind of preparation method of surface porous niti shape memory alloy
  • A kind of preparation method of surface porous niti shape memory alloy
  • A kind of preparation method of surface porous niti shape memory alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The surface of medical NiTi shape memory alloy was modified 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, the graphite plate as the negative electrode, and control the temperature of the electrolyte to be 30 ° C ± 5 ° C, using a DC voltage stabilized power supply, in Anodizing treatment under the condition of constant voltage 35V for 90min; wherein, the electrolyte is a mixed solution prepared by ammonium fluoride and ammonium sulfate with glycerol, ethylene glycol and deionized water as solvents, and the concentrations thereof are respectively 0.3 mol / L and 0.2 mol / l;

[0038] Step 3: Rinse with deionized water and then dry naturally to obtain a surface-connected and surface-porous NiTi shap...

Embodiment 2

[0044] The surface of medical NiTi shape memory alloy was modified 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, the graphite plate as the negative electrode, and control the temperature of the electrolyte to be 30 ° C ± 5 ° C, using a DC voltage stabilized power supply, in Under the condition of constant voltage 40V, anodizing treatment for 90min; wherein, the electrolyte is a mixed solution prepared by ammonium fluoride and ammonium sulfate with glycerol, ethylene glycol and deionized water as solvents, and the concentrations thereof are respectively 0.2 mol / liter and 0.2 mol / l;

[0047] Step 3: Rinse with deionized water and then dry naturally to obtain a surface-connected and surface-porous NiTi ...

Embodiment 3

[0051] The surface of medical NiTi shape memory alloy was modified 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, the graphite plate as the negative electrode, and control the temperature of the electrolyte to be 30 ° C ± 5 ° C, using a DC voltage stabilized power supply, in Anodizing treatment under the condition of constant voltage 50V for 90min; wherein, the electrolyte is a mixed solution prepared by ammonium fluoride and ammonium sulfate with glycerol, ethylene glycol and deionized water as solvents, and the concentrations thereof are respectively 0.1 mol / L and 0.2 mol / l;

[0054] Step 3: Rinse with deionized water and then dry naturally to obtain a surface-connected and surface-porous NiTi shap...

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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 closest to that of human hard tissue, which can improve its mechanical compatibility with human bones. , NiTi has been successfully used 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 fluid, etc., the surface is prone to release biotoxic Ni 2+ ions; in addition, as an implant material in vivo, NiTi itself does not have biological activity, that is, it cannot directly combine with bone (osseointegration). In order ...

Claims

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Application Information

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Patent Type & Authority Patents(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 JIAOTONG UNIV
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