Electrodeposition preparation method for biomedical titanium base hydroxyapatite composite material

A technology of hydroxyapatite and electrodeposition, which is applied in the field of biomedical composite materials, can solve the problems of loose structure, poor bonding strength, and reduced concentration of electrodeposited hydroxyapatite coating, and achieves low price, easy control, and low concentration. The effect of easy industrialization

Inactive Publication Date: 2013-04-03
TIANJIN XUANZHEN BIOMEDICAL TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, under the action of an external electric field, when water is reduced on the surface of the cathode, there will be hydrogen evolution phenomenon, and after calcium and phosphorus ions are deposited on the surface of the cathode, the concentration of calcium and phosphorus ions near the cathode will decrease, and the ions will diffuse too much to the electrode surface. Slow concentration polarization will cause the phenomenon of concentration polarization, which will eventually lead to problems such as loose structure of electrodeposited hydroxyapatite coating and poor bonding strength with the substrate, which restricts the use of titanium-based hydroxyapatite coating as a medical biomaterial.

Method used

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  • Electrodeposition preparation method for biomedical titanium base hydroxyapatite composite material
  • Electrodeposition preparation method for biomedical titanium base hydroxyapatite composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Pretreatment of the substrate: ①Mechanical polishing: wire-cut the pure titanium sheet into a rectangular strip of 10.0cm×1.0cm×0.8cm, and pass through 100 # 、200 # , 800 # 、1000 # Water abrasive paper is mechanically polished in the same direction until the surface is even and bright, and rinsed with deionized water. ② Degreasing: In a beaker filled with 500mL deionized water, add 12g of anhydrous Na 2 CO 3 , 2g anhydrous Na 2 SiO 3 , 12gNa 3 PO 4 12H 2O, after stirring and dissolving, it is prepared as a degreasing liquid. Pour about 100mL into a beaker, use polished and bright pure titanium substrate as anode, and platinum-plated titanium mesh as cathode, current density 10mA·cm -2 Next, electrolytically degrease for 30s, take out the pure titanium substrate and rinse it with distilled water. ③Acid etching: In two 200mL beakers, first add a certain amount of deionized water, then add 3mL H 2 SO 4 and 1.5mL HNO 3 Prepare a strong infusion, then add 1...

Embodiment 2

[0030] (1) Pretreatment of substrate: same as embodiment 1.

[0031] (2) Preparation of electroplating solution:

[0032] (3) With the pure titanium sheet pretreated in the above step (1) as the cathode, and the platinum-plated titanium mesh as the anode, the electroplating solution prepared in the step (2) is heated to a constant temperature of 60° C. Electrodeposition is carried out on the surface of the substrate in the potential mode, wherein the deposition potential is 4.0V.

[0033] (4) After 1 hour of electrodeposition, take out the sample, rinse it with distilled water, and dry the sample in a vacuum oven at a constant temperature of 80°C for 1 hour, forming a well-bonded hydroxyapatite coating on the surface of the substrate .

Embodiment 3

[0035] (1) Pretreatment of the substrate: the substrate in Examples 1 and 2 was replaced with titanium alloy (Ti6Al4V), and the pretreatment method remained unchanged.

[0036] (2) Preparation of electroplating solution:

[0037]

[0038] (3) With the titanium alloy (Ti6Al4V) pretreated by the above step (1) as the cathode, and the platinum-plated titanium mesh as the anode, the electroplating solution prepared in the step (2) is heated to a constant temperature of 80 ° C, and under magnetic stirring conditions, Electrodeposition is carried out on the surface of the substrate by constant current method, in which the current density is 5.0mA·cm -2 .

[0039] (4) After 1 hour of electrodeposition, take out the sample, rinse it with distilled water, and dry the sample in a vacuum oven at a constant temperature of 80°C for 1 hour, forming a well-bonded hydroxyapatite coating on the surface of the substrate .

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Abstract

The present invention discloses a preparation method for electrodeposition of a hydroxyapatite coating on the surface of titanium or a titanium alloy. The method comprises: adopting a pretreated titanium substrate or a pretreated titanium alloy substrate as a cathode, adopting a platinum-plated titanium mesh as an anode, heating an electroplating solution to a constant temperature of 40-80 DEG C, and adopting a constant current manner or a constant potential manner under a magnetic stirring condition to carry out electrodeposition, wherein a current density is 1.0-50.0 mA.cm<-2>, a deposition potential is 1.0-10.0 V, the electroplating solution comprises 20.2-80.0 mmol.L<-1> of Ca<2+> and 10.0-50.0 mmol.L<-1> of H2PO4<->, a Ca/P molar ratio is 1.6-2.0, a supporting electrolyte concentration is 0.1-1.0 mol.L<-1>, and the pH value is 4.2-5.0. According to the present invention, the hydroxyapatite coating prepared through electrodeposition by using the constant current manner or the constant potential manner has characteristics of fine crystal, smooth surface, strong bonding force with the substrate, good biological activity and mechanical property. The preparation method for the titanium base hydroxyapatite composite material has characteristics of mild reaction condition, avoidance of influence on material biological activity by a high temperature treatment, simple process, and low equipment investment, wherein a series of problems caused by expensive equipment and complex operation of the existing method are overcome with the preparation method.

Description

technical field [0001] The invention belongs to the field of biomedical composite materials, in particular to an electrodeposition preparation method of titanium-based hydroxyapatite biomedical composite materials. Background technique [0002] Titanium and titanium alloys have excellent characteristics such as light weight, low elastic modulus, non-magnetism, and non-toxicity. They are recognized by the world as excellent metal materials in the field of biomedicine. Compared with metal materials such as stainless steel and cobalt-based alloys, It has great application advantages and great room for development. However, titanium is a biologically inert metal and lacks osteoinductive ability. When in contact with the physiological environment of the human body, it cannot form chemical bonds with bone and cannot promote the growth of new bone. It has poor affinity and biocompatibility with the body. Therefore, modifying the surface of titanium-based alloys to improve their bi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D9/08
Inventor 卜路霞李建颖
Owner TIANJIN XUANZHEN BIOMEDICAL TECH DEV
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