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Process for producing nan-hydroxyl kietyoite/carbon nano-pipe compound coating

A composite technology of nano-hydroxyapatite and carbon nanotubes, which is applied in the field of biomedical materials, can solve the problems of large difference in thermal expansion coefficient and weakened bonding force, and achieve the effects of reducing sintering temperature, enhancing bonding force, and avoiding damage

Inactive Publication Date: 2006-05-17
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of weakening of the binding force between the HA coating and the biomedical metal titanium due to the large difference in thermal expansion coefficient, and to provide a nano-hydroxyapatite / carbon nanotube composite coating prepared by electrophoretic deposition. layer method

Method used

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  • Process for producing nan-hydroxyl kietyoite/carbon nano-pipe compound coating
  • Process for producing nan-hydroxyl kietyoite/carbon nano-pipe compound coating
  • Process for producing nan-hydroxyl kietyoite/carbon nano-pipe compound coating

Examples

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Effect test

Embodiment 1

[0020] Example 1: The base material is commercial pure titanium, the sample size is 10mm×20mm×3mm, mechanically polished with sandpaper, and ultrasonically cleaned with water, acetone and ethanol once, and then immersed in 10mol / 1 NaOH solution and heat treated at 140°C 6h. After cooling, rinse with deionized water, and then place in 5% NaHCO 3 Soak in the solution for 1-10h to keep the surface neutral. Configure an electrophoretic deposition solution with a total concentration of (including HA and CNTs) 0.005g / ml with a CNTs content of 20%, and add a few drops of concentrated HNO. 3 , Adjust the pH value between 4 and 5, and the Zeta potential measured under this condition is positive, indicating that the particles are positively charged. The prepared solution is coagulated for one day to stabilize the system, ultrasonicated for 3 hours, centrifuged to separate larger particles, and then ultrasonicated for 0.5 hours for use. A circular stainless steel ring with an outer diameter ...

Embodiment 2

[0022] Example 2: Electrophoretic deposition conditions and electrode pretreatment are the same as in Example 1. The obtained sample was dried in air, sintered at 700°C under the protection of argon, and controlled at this temperature for 2h, and then cooled to room temperature. A uniform gray coating without cracks (see figure 1 b). The mechanical test results are listed in Table 1. The coating-titanium substrate bonding force is 34.94MP. Table 1 shows the comparison of the binding force of the composite coatings with different contents of CNTs. From the results in Table 1, it can be seen that the bonding force between the composite coating and the metal substrate has been greatly improved after adding CNTs, and there is little difference in the bonding force between the composite coating and the substrate when the CNTs content is 20% and 30%.

Embodiment 3

[0023] Example 3: The electrophoretic deposition conditions are the same as in Example 1, wherein the CNTs content is adjusted to 30% and finally a uniform black coating is obtained (see figure 1 c). The sample was dried in air and sintered at 700°C under the protection of argon. The temperature was controlled at this temperature for 2 hours and then cooled to room temperature. A uniform and crack-free black coating (see figure 1 d). The mechanical test results are listed in Table 1. The coating-titanium substrate bonding force is 35.44MP.

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Abstract

The present invention provides a method for preparing nano hydroxyapatite / carbon nano tube composite coating by adopting electrophoresis deposition process. Said method includes the following steps: base pretreatment, preparing nano-grade HA and CNTs electrophoresis deposition soliquoid, making the electrophoresis deposition soliquoid undergo the processes of standing still, ultrasonic treatment and centrifugal separation, removing upper layer suspended liquor, making electrophoresis deposition treatment and sintering under the argon atmosphere so as to obtain the invented target product.

Description

Technical field [0001] The invention relates to a nano-hydroxyapatite / carbon nanotube composite coating, in particular to a method for preparing a novel carbon nanotube / nano-hydroxyapatite composite coating using an electrophoretic deposition method, and the composite prepared thereby The coating has good mechanical properties and is expected to become a novel biomedical material. Background technique [0002] Since the 1970s, hydroxyapatite (Hydroxyapatite, referred to as HA, chemical formula Ca 10 (PO 4 ) 6 (OH) 2 ) The preparation of bioceramic coatings has aroused great interest among researchers in chemistry, materials science, biology, and clinical medicine. HA has good biocompatibility and biological activity. It is the main inorganic component of human hard tissues (bone and teeth). After being implanted in the human body, it can form a close combination with human tissues in a short time. However, Ha has high brittleness and low strength, and its flexural strength and fr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D13/02A61L27/32A61L27/42
Inventor 林昌健韩会娟云虹
Owner XIAMEN UNIV
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