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Method for preparing titanium alloy/hydroxylapatite gradient composite coating

A hydroxyapatite and composite coating technology, used in coatings, medical science, prostheses, etc., can solve the problems of low tensile bonding strength, accelerated diffusion of titanium alloys and HA atoms, etc., to improve tensile bonding strength. Effect

Inactive Publication Date: 2008-12-24
NANTONG MING YU NEW MATERIAL TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the deficiency of low tensile bonding strength in the prior art, the present invention provides a method for preparing a titanium alloy / hydroxyapatite gradient composite coating. The method adopts a friction stir method, and HA powder is stirred into the surface layer of the titanium alloy. Form a viscoplastic state at high temperature, accelerate the atomic diffusion between titanium alloy and HA, and generate chemical bonds, which can improve the tensile bonding strength between HA and titanium alloy

Method used

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  • Method for preparing titanium alloy/hydroxylapatite gradient composite coating

Examples

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Effect test

Embodiment 1

[0018] Example 1: Preparation of HA gradient composite coating on Ti-6Al-4V surface by friction stir.

[0019] Select Ti-6Al-4V titanium alloy 1, grind it with sandpaper, polish it with a polishing machine, clean it ultrasonically with acetone and alcohol for 20 minutes, rinse it with double distilled water, and dry it. Two grooves 2 with a depth of 2 mm and a width of 3 mm are opened on the titanium alloy 1 at an interval of 12 mm, and the grooves 2 are filled with HA micron powder, and the particle size of the micron powder is 3 μm. The stirring head 3 is made of tungsten-rhenium alloy, the diameter of the stirring needle end is Φ3.5mm, the height is 4mm, and the diameter of the stirring head shoulder 4 is Φ12mm. The rotation speed of the stirring head 3 is 850r / min, the lateral movement speed is 36mm / min, and the inclination angle is 2.5°, and the Ti-6Al-4V groove 2 filled with HA micron powder is stirred and rubbed. During the friction stir process, titanium alloy 1 was h...

Embodiment 2

[0021] Example 2: Multi-pass stir friction on the surface of Ti-6Al-4V to prepare a gradient composite coating of HA nanopowder and titanium alloy powder mixed in different proportions.

[0022] Select Ti-6Al-4V titanium alloy 1, grind it with sandpaper, polish it with a polishing machine, clean it ultrasonically with acetone and alcohol for 20 minutes, rinse it with double distilled water, and dry it. Ten grooves 2 with a depth of 4 mm and a width of 4 mm are opened on the titanium alloy 1 at an interval of 12 mm, and the grooves are first filled with 20% by mass of HA nanopowder and 80% of titanium alloy mixed powder. The stirring head 3 is made of tungsten-rhenium alloy, the diameter of the stirring needle end is Φ3.5mm, the height is 4mm, and the diameter of the stirring head shoulder 4 is Φ12mm. The rotation speed of the stirring head 3 is 700r / min, the lateral movement speed is 90mm / min, and the inclination angle is 2.5°, and the Ti-6Al-4V groove 2 containing the mixed p...

Embodiment 3

[0024] Example 3: Gradient composite coating of Ti-6Al-4V nano powder + HA nano powder mixed on the surface of Ti-6Al-4V with a friction stir volume ratio of 1:1.

[0025] Select Ti-6Al-4V titanium alloy 1, grind it with sandpaper, polish it with a polishing machine, clean it ultrasonically with acetone and alcohol for 20 minutes, rinse it with double distilled water, and dry it. A plurality of grooves 2 with a depth of 2 mm and a width of 4 mm are opened on the titanium alloy 1 at an interval of 12 mm, and the grooves are filled with Ti-6Al-4V nano-powder+HA nano-powder mixed at a volume ratio of 1:1. The stirring head 3 is made of tungsten-rhenium alloy, the diameter of the stirring needle end is Φ3.5mm, the height is 4mm, and the diameter of the stirring head shoulder 4 is Φ12mm. The rotation speed of the stirring head 3 is 450r / min, the lateral movement speed is 28mm / min, and the inclination angle is 2.5°, and the Ti-6Al-4V groove 2 containing the mixed nano powder is subj...

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Abstract

The invention discloses a gradient compound coating of a titanium alloy / hydroxyapatite and a preparation method thereof. The surface of the titanium alloy to be made is polished, cleaned and baked; 2 to 10 perforated flutes of 2mm multiplied by 2mm to 4 mm multiplied by 4mm are processed on the surface of the titanium alloy every 12mm; all the flutes are parallel to each other and are filled with powder; the titanium alloy filled with powder is placed on a tool with a heating device and is fixed and clamped; the titanium alloy is stirred by friction under the conditions that the room temperature rises to 350 DEG C to 500 DEG C, the rotation speed of a stirrer head ranges from 450 r / min to 850 r / min; the horizontal speed ranges from 28 mm / min to 90 mm / min, with an angle of inclination of 2.5 DEG. The rear area of a stirring area is provided with a cooling device, with the machining parts protected by argon gas. By a stirring method, the HA powder is stirred on the surface of the titanium alloy, thus forming viscoplasticity, speeding up the atom proliferation between the titanium alloy and the HA powder, and generating a chemical bond. The tensile-bonding strength is raised from 24.8MPa in the prior art to ranging from 65 MPa to 103MPa.

Description

technical field [0001] The invention relates to a method for preparing a composite coating on a titanium alloy. Background technique [0002] Titanium alloys are widely used in the field of biomedical materials as bone substitute materials. The key technology limiting its use is the level of biological activity. The preparation of hydroxyapatite (Hydroxyapatite, HA) coating on the surface of titanium alloys is the most important way to improve its biological activity. One of the methods. [0003] The properties of HA coating have an important influence on the implantation effect and life of titanium alloy. Among them, the bonding strength between the coating and the substrate is particularly important. If the coating is not tightly combined with the matrix, the implant will easily cause the coating to separate from the metal matrix in the human body, resulting in implant failure. Most of the improvement methods start with the process itself and propose methods to increase...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61L27/32A61L27/06
Inventor 叶雅静尹大川熊江涛卢慧甍郭卫红
Owner NANTONG MING YU NEW MATERIAL TECH CO LTD
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