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Metal surface constructional gradient biological layer and its preparation and usage

A bio-coating and structural gradient technology, applied in the fields of coating, electrolytic inorganic material coating, medical science, etc., can solve problems such as the inability to effectively prevent the dissolution of harmful metal ions, so as to facilitate cell proliferation, improve adhesion, and improve biological active effect

Inactive Publication Date: 2004-12-29
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In 1995, the Japanese proposed a micro-arc oxidation process to synthesize a porous titanium dioxide layer on the surface of titanium alloy. It directly prepared a porous surface layer on the metal substrate without forming a dense titanium dioxide film on the inner layer, which could not effectively prevent the dissolution of harmful metal ions.

Method used

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  • Metal surface constructional gradient biological layer and its preparation and usage
  • Metal surface constructional gradient biological layer and its preparation and usage
  • Metal surface constructional gradient biological layer and its preparation and usage

Examples

Experimental program
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Effect test

Embodiment 1

[0028] 1) With pure titanium as the substrate, first anodize the pure titanium: use 0.5M / L oxalic acid solution as the electrolyte, and use pure titanium as the anode, stainless steel electrolytic cell as the cathode, and use DC power supply with voltages of 100V and 200V respectively , 300V, the range of current density is 300~50mA / cm 2 , the oxidation time is 2min, 10min, 30min respectively, and the anodic oxidation is carried out on the pure titanium specimen.

[0029]2) Prepare the electrolyte solution so that it contains 0.5 mol / L of calcium acetate and 0.05 mol / L of β-sodium glycerophosphate. With the anodized test piece as the anode and the stainless steel electrolytic cell as the cathode, the current density is 5-100mA / cm when the DC high voltage is 150, 300V and 600V respectively. 2 , the oxidation time is 5min, 30min, 60min respectively.

[0030] The titanium dioxide coating with structural gradient prepared by this group of processes is composed of dense inner lay...

Embodiment 2

[0032] 1)) With Ti6Al4V as the substrate, first anodize Ti6Al4V: use 0.5M / L phosphoric acid solution as electrolyte, pure titanium as anode, stainless steel electrolytic cell as cathode, DC power supply, voltage respectively 100V, 200V, 300V, the range of current density is 300~180mA / cm 2 , the oxidation time is 2min, 10min, 30min, anodizing the pure titanium specimen.

[0033] 2) Prepare the electrolyte solution so that it contains 0.05mol / L of calcium ions and 0.001mol / L of phosphate ions, with the anodized specimen as the anode and the stainless steel electrolytic cell as the cathode, and the current density is 20mA / cm 2 , 60mA / cm 2 , 100mA / cm 2 , the voltage is 200-420V, and the oxidation time is 5min, 10min, 30min.

[0034] The biological coating with structural gradient prepared by this group of processes is composed of a dense inner layer (1.2-5 μm in thickness) and porous titanium dioxide (1.7-20.0 μm in thickness) in the outer layer. The thickness of the inner lay...

Embodiment 3

[0036] 1) First, anodize Ti6Al7Nb: use 0.05M / L oxalic acid solution as electrolyte, titanium alloy as anode, stainless steel electrolytic cell as cathode, use DC power supply at constant voltage 125V, current density variation range is 300-180mA / cm 2 , the oxidation time is 30min, anodize the pure titanium specimen.

[0037] 2) Prepare the electrolyte solution so that it contains 0.01mol / L calcium ion and 0.001mol / L phosphate ion, take the anodized test piece as the anode and the stainless steel electrolytic cell as the cathode, adopt a DC high voltage power supply, and take the current density 40mA / cm 2 , the oxidation time is 5-40min, and the voltage is 200-430V.

[0038] The titanium dioxide coating with structural gradient prepared by this group of processes is composed of dense inner layer (0.7 μm in thickness) and porous titanium dioxide (2-15.0 μm in thickness) in the outer layer. The thickness of the inner layer can reach 2μm; the hardness can reach HV 200g 270; t...

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Abstract

The present invention relates to composite oxidation process for surface modification of metal. The composite oxidation process includes first anode oxidation to from compact anatase titania film on the surface of substrate, then micro arc oxidation to form porous calcium and phosphorus containing anatase or mixed anatase-rutile titania coating on the surface of the film. The coating substrate is titanium or titanium alloy and the coating is one gradient structure comprising inner compact layer and surface porous uneven layer. Clinical practice shows that the compact titanium film can inhibit effectively the leaching out of harmful metal ion to body fluid, the surface porous structure is favorable to the growth of bone tissue, the adhesion between the bone tissue and the implant and the cell proliferation, and the calcium and phosphorus elements are favorable to forming bone-like hydroxyapatite in body fluid.

Description

technical field [0001] The invention relates to a modification treatment technology for the surface of metal parts, in particular to a method for preparing a structurally gradient biological coating on the metal surface by using a composite oxidation method combining anodic oxidation and micro-arc oxidation. Background technique [0002] The surface modification of metal parts will be widely used in automobile, aviation, aerospace, machinery, medical and other departments. In the past, methods for preparing coatings on metal surfaces include plasma spraying, sol-gel and other methods, but the coatings prepared by plasma spraying technology are easy to fall off, and it is difficult to prepare a uniform porous surface structure. The bonding strength between the surface coating and the substrate prepared by sol-gel technology is low, and the subsequent high-temperature heat treatment changes the phase structure of the coating. [0003] In the 1970s, scientists from the former ...

Claims

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Application Information

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IPC IPC(8): A61L27/06A61L27/32C25D9/04
Inventor 张人佶唐光昕颜永年卢清萍林峰吴任东熊卓
Owner TSINGHUA UNIV
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