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Method of preparing electrophoretic deposited hydroxyl apatite coating on Ti or Ti alloy surface

A hydroxyapatite, electrophoretic deposition technology, applied in coatings, electrolytic coatings, electrophoretic plating, etc., can solve the problems of limited application, low bonding strength, etc.

Inactive Publication Date: 2006-09-20
FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Electrophoretic deposition provides a new preparation method for HAp coating, however, there are still some deficiencies in electrophoretic deposition
During the electrophoretic deposition process, the HAp particles and the substrate are electrostatically adsorbed rather than metallurgically adsorbed or chemically bonded, so the bonding strength between the coating and the substrate is not high, usually less than 20MPa, which limits its clinical application.

Method used

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  • Method of preparing electrophoretic deposited hydroxyl apatite coating on Ti or Ti alloy surface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Preparation of hydroxyapatite powder: add 0.2g (concentration: 8g / L) polyethylene glycol to 25mL 0.5mol / L calcium nitrate solution, stir to dissolve and adjust the pH of the solution to ≥ 11.00 with ammonia water, drop by drop under magnetic stirring Add 25mL, 0.3mol / L, ammonium phosphate solution with pH ≥ 10, and finish adding in about 10 minutes. After standing still, the precipitate and the solution were transferred into a stainless steel autoclave lined with polytetrafluoroethylene, and the autoclave was placed in a constant temperature drying oven for hydrothermal reaction at 200°C for 8 hours. After natural cooling, wash with distilled water twice, then with absolute ethanol, filter with suction, and finally dry at 100°C for 1 hour, weigh about 1.1g of hydroxyapatite powder, and store it in a weighing bottle .

[0021] Preparation of the suspension: Weigh 1g of HAp powder and add it to 50mL of the dispersion medium mixed with n-butanol and chloroform with a volu...

Embodiment 2

[0027] Preparation of hydroxyapatite powder: add 0.2g (concentration: 8g / L) polyethylene glycol to 25mL 0.5mol / L calcium nitrate solution, stir to dissolve and adjust the pH of the solution to ≥ 11.00 with ammonia water, drop by drop under magnetic stirring Add 25mL, 0.3mol / L, ammonium phosphate solution with pH ≥ 10, and finish adding in about 10 minutes. After standing still, the precipitate and solution were transferred into a stainless steel autoclave lined with polytetrafluoroethylene, and the autoclave was placed in a constant temperature drying oven for hydrothermal reaction at 200°C for 6.5 hours. After natural cooling, wash with distilled water twice, then with absolute ethanol, filter with suction, and finally dry at 100°C for 1 hour, weigh about 1.1g of hydroxyapatite powder, and store it in a weighing bottle .

[0028] Preparation of the suspension: Weigh 1g of HAp powder and add it to 50mL of the dispersion medium mixed with n-butanol and chloroform at a volume r...

Embodiment 3

[0034] Preparation of hydroxyapatite powder: add 0.2g (concentration: 8g / L) polyethylene glycol to 25mL 0.5mol / L calcium nitrate solution, stir to dissolve and adjust the pH of the solution to ≥ 11.00 with ammonia water, drop by drop under magnetic stirring Add 25mL, 0.3mol / L, ammonium phosphate solution with pH ≥ 10, and finish adding in about 10 minutes. After standing still, the precipitate and solution were transferred into a stainless steel autoclave lined with polytetrafluoroethylene, and the autoclave was placed in a constant temperature drying oven for hydrothermal reaction at 200°C for 6.5 hours. After natural cooling, wash with distilled water twice, then with absolute ethanol, filter with suction, and finally dry at 100°C for 1 hour, weigh about 1.1g of hydroxyapatite powder, and store it in a weighing bottle .

[0035] Preparation of the suspension: Weigh 1g of HAp powder and add it to 50mL of the dispersion medium mixed with n-butanol and chloroform with a volume...

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Abstract

This invention relates to a method for preparing hydroxyapatite coating layer on the surface of Ti or Ti alloy by electrophoretic deposition, which comprises the steps of: (1) adding hydroxyapatite powders and triethanolamine into a mixed dispersing medium of n-butonol and chloroform at a volume ratio of 8~2:1, and ultrasonicating; (2) using medical pure Ti or Ti alloy (Ti6Al4V) pretreated with a mixed solution of hydrogen peroxide and concentrated ammonia solution at a volume ratio of 1:1 as the cathode, and Pt sheet or graphite electrode as the anode; (3) performing electrophoretic deposition at an electric field strength of 30 V / cm for three times (30 s for each time) to obtain hydroxyapatite coating layer; and (4) performing thermal treatment at 680-800 deg.C for 2 h to improve the bonding strength of the coating layer. The method has such characteristics as no staleness, high stability, short deposition time, simple process and high bonding strength.

Description

technical field [0001] The invention relates to a preparation method for electrophoretic deposition of hydroxyapatite coating on the surface of titanium or titanium alloy. technical background [0002] Coating bioactive hydroxyapatite (HAp for short) ceramic coatings on the surface of medical metals or alloys can combine the advantages of the two materials, and has become one of the research hotspots in the field of biomaterials. There are more than a dozen methods for preparing HAp coatings, such as plasma spraying, ion beam assisted deposition, sol-gel method, electrodeposition, and electrophoretic deposition. Electrophoretic deposition is a process in which charged solid particles in a suspension move directionally under the action of an electric field and form a deposition layer on the electrode surface. It is a synthesis of two processes: electrophoresis and deposition. It has unique advantages in the preparation of coating materials, especially multi-layer materials....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D13/02A61L27/32
Inventor 肖秀峰刘榕芳唐晓恋
Owner FUJIAN NORMAL UNIV
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