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Method for preparing hydroxyapatite nano composite coat with gradient function

A nano-composite coating and hydroxyapatite technology, which is applied in the direction of coating, electrolytic coating, electrophoretic plating, etc., can solve the problems of harmful coating and easy peeling off

Inactive Publication Date: 2008-02-13
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main reason for these problems is that the physical and chemical properties of the HAp coating and the base titanium are quite different, especially in the thermal expansion coefficient of HAp (αHAP=14×10 -6 K -1 ) significantly higher than the thermal expansion coefficient of metal titanium (αTi=10.3×10 -6 K -1 ), in this way, in the cooling process of heat treatment, it is easy to accumulate harmful tensile stress at the interface between the coating and the substrate, so that the coating is easy to fall off. In addition, the densification process of the coating has a large volume shrinkage, while the substrate Titanium has almost no shrinkage, and this mismatch also accumulates a large amount of internal stress inside the coating and induces cracks

Method used

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  • Method for preparing hydroxyapatite nano composite coat with gradient function

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1. Substrate pretreatment: (1) Mechanical polishing: Take a titanium sample with a thickness of 0.8mm and cut it into a sample with a size of about 30mm×10mm, and then mechanically polish it with 100#, 800#, 1200# water-grinding sandpaper until the surface is uniform bright. (2) Alkali elution means: add 10g sodium carbonate, 10g sodium phosphate, and 5g sodium silicate in 500mL deionized water in sequence, heat to dissolve, then add 2.5mL polyethylene glycol octylphenyl ether (OP-10 ),well mixed. Pour out about 50mL, put all the polished titanium samples into the alkaline washing solution, boil for 5min, then transfer to an ultrasonic cleaner and sonicate for 5min. After taking it out, rinse it with tap water to completely remove the residual lye on the surface. (3) Acid etching: first add a certain amount of deionized water to a graduated 500mL plastic bottle, then add 50mL HF (40wt%) and 150mL concentrated HNO 3 (68wt%), shake well, add deionized water to the 500m...

Embodiment 2

[0031] 1. Substrate pretreatment: (1) Mechanical polishing: Same as in Example 1. (2) Alkali elution means: same as embodiment 1. (3) Acid etching: first add a certain amount of deionized water to a graduated 500mL plastic bottle, then add 40mL HF (40wt%) and 120mL concentrated HNO 3 (68wt%), shake well, add deionized water to the 500mL mark, shake well. Pour out about 50mL into a plastic beaker, put the titanium samples after alkali washing into the treatment one by one, and the treatment time is about 40s. Clean and dry in an oven at 120°C for later use.

[0032] 2. Suspension preparation: Suspension was prepared according to Example 1, and left to age for 2 days.

[0033] 3. Electrophoretic deposition: Before deposition, the suspension was stirred and ultrasonicated for 25 minutes, and two stainless steel counter electrodes (3.5cm×4cm×0.06cm) were inserted into the S1, S2 and S3 suspensions in parallel, and the distance between them was adjusted to 2cm. Insert the pretr...

Embodiment 3

[0037] 1. Substrate pretreatment: (1) Mechanical polishing: replace titanium with TC4 titanium alloy, and the rest are the same as in Example 1. (2) Alkali elution refers to: add 7.5g sodium carbonate, 7.5g sodium phosphate, 2.5g sodium silicate in 500mL deionized water in sequence, heat to dissolve, then add 2mL polyethylene glycol octylphenyl ether (OP -10), mix well. Pour out about 50mL, put all the polished titanium samples into the alkali washing solution, boil for 5 minutes, then transfer to an ultrasonic cleaner for 5 minutes of ultrasonic cleaning. After taking it out, rinse it with tap water to completely remove the residual alkali solution on the surface. (3) acid etching: with embodiment 1.

[0038] 3. Preparation of suspension: Measure 50mL of absolute ethanol in a 100mL beaker, add 1 drop of concentrated HNO 3 , after stirring, use pH test paper to test that the pH is between 4 and 5, add different ratios of HAp powder and Al powder, and prepare three suspension...

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Abstract

A method of preparing a hydroxyapatite nano composite coating with gredient function relates to a method of preparing the hydroxyapatite nano composite coating on the surface of titanium or titanium alloy. The invention provides a method of preparing the hydroxyapatite nano composite coating with gredient function on the surface of titanium or titanium alloy by multi-layer electrophoretic codeposition of the hydroxyapatite nano powder and the metal A1 micro powder, reaction, sintering and heat treatment, so as to improve the bonding strength between the hydroxyapatite nano composite coating and the basal. The titanium or titanium alloy after mechanical finishing, alkaline washing and degreasing as well as acid etch treatment receive at least three times of electrophoretic deposition subsequently in the suspension with different Hap powder and A1 powder content in the order of gradually reduced content of A1; DC current is adopted to deposit the voltage 30 to 40V for 15 to 30 minutes; and then the sample reacts and receives sintering and heat treatment in a tube type resistance furnace to obtain the hydroxyapatite nano composite coating with gredient function, and the coating is not easy to crack during the preparation process.

Description

technical field [0001] The invention relates to a method for preparing a hydroxyapatite nanocomposite coating on the surface of titanium or titanium alloy. technical background [0002] Pure titanium (Ti) and titanium alloys are widely used in clinical implant materials due to their good biocompatibility and mechanical properties, but their biological activity is insufficient and their chemical combination with surrounding tissues is poor. Hydroxyapatite (HAp) is the main inorganic component of human bone and other hard tissues. It has high biological activity and biocompatibility. Metabolism can form a chemical bond with bone tissue, which increases the bonding strength of the interface between the implant and the bone in the early stage of implantation. However, the mechanical properties of HAp are brittle and its fatigue resistance is poor, which limits its application in the weight-bearing parts of the human body. The HAp coating is prepared on the surface of metal tita...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D13/02C25D13/20
Inventor 王周成倪永金黄金聪
Owner XIAMEN UNIV
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