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Process for preparing composite coat of hydroxy apatite and aluminum oxide

A hydroxyapatite and composite coating technology, applied in coating, electrolytic coating, electrophoretic plating, etc., can solve the problems of coating peeling and harmful

Inactive Publication Date: 2007-08-08
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 ) is higher than 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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  • Process for preparing composite coat of hydroxy apatite and aluminum oxide

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 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 (65-68wt%), shake well, add deionized water to the 5...

Embodiment 2

[0036] 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 (65-68wt%), shake well, add deionized water to the 500mL mark, shake well. Pour out about 50mL into a plastic beaker, put the alkali-washed titanium samples into treatment one by one, and the treatment time is about 40s. After taking them out, put them into running water to rinse immediately to quickly remove the residual acid on the surface. After cleaning, the samples were soaked in deionized water for later use.

[0037] 2. Micro-arc oxidation: Pour 120mL of distilled water into a 200mL beaker in advance, and measure 4mL of concentrated H with a pipette. 2 SO 4 (98wt%) is added in the beaker under stirring, is mixed with electrolytic solution, and after cooling, the beaker is put into the w...

Embodiment 3

[0043] 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.

[0044] 2. Micro-arc oxidation: Pour 120mL of distilled water into a 200mL beaker in advance, and use a pipette to measure 5mL of concentrated H 2 SO 4 (98wt%) is added in the beaker under stirring, is mixed with electrolytic solution, and after cooling, the beaker is put int...

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Abstract

The invention relates to a method for preparing a composite coat of hydroxyl agustite and alumina, especially a method for preparing HAP cost on the face of titanium. The inventive method comprises that depositing the alumina powder and hydroxyl agustite; deposting the composite coat on the face of titanium or titanium alloy via electrophoresis deposit method, to improve the combining strength between the coat and the base; mechanically furnishing the titanium or titanium alloy, degreasing via washing with alkali and immerging and corroding via acid, oxidizing via micro electric arc, then processing electrophoresis deposit in the suspension prepared from alumina powder and HAP powder, then thermally processing under argon gas at 600-900Deg. C to form HAP / Al2O3 coat. In the thermal treatment, the Al is reacted into Al2O3 to expand the volume to counteract with the reduction of coat and restrain the crack. And the combination with HAP can reduce the thermal expansion factor of coat, to approach it to the base, restrain the crack of coat and improve the physical property of HAP coat.

Description

technical field [0001] The invention relates to a preparation method for electrophoretic deposition of hydroxyapatite / alumina composite 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 pre...

Claims

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Application Information

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IPC IPC(8): A61L27/42A61L31/12C25D13/02
Inventor 王周成倪永金
Owner XIAMEN UNIV
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