CN110565092B - Functional coating for bionic human body joint tissue structure and preparation method and application thereof - Google Patents

Functional coating for bionic human body joint tissue structure and preparation method and application thereof Download PDF

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CN110565092B
CN110565092B CN201910928219.0A CN201910928219A CN110565092B CN 110565092 B CN110565092 B CN 110565092B CN 201910928219 A CN201910928219 A CN 201910928219A CN 110565092 B CN110565092 B CN 110565092B
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titanium alloy
functional coating
tissue structure
coating
joint tissue
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CN110565092A (en
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苏峰华
李傲松
孙建芳
唐邕涛
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South China University of Technology SCUT
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    • A61L27/00—Materials for grafts or prostheses or for coating grafts or prostheses
    • A61L27/02—Inorganic materials
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    • A61L27/56—Porous materials, e.g. foams or sponges
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    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/002—Pretreatement
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    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/352—Working by laser beam, e.g. welding, cutting or boring for surface treatment
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C14/00—Alloys based on titanium
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    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
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Abstract

The invention discloses a functional coating for bionic human joint tissue structure and a preparation method and application thereof. The method comprises the following steps: carrying out laser processing on the surface of the titanium alloy to obtain the titanium alloy with a skeleton-like porous texture structure on the surface; carrying out thermal oxidation treatment on the titanium alloy with the bone-like porous texture structure on the surface to generate hard TiO on the surface of the bone-like porous texture structure2Film on TiO2And (3) spinning and coating polytetrafluoroethylene emulsion on the hard film, and drying to obtain the functional coating simulating the human joint tissue structure. The invention obtains the functional coating with bionic tissue structure characteristics by utilizing a laser processing technology, a thermal oxidation treatment technology and a coating technology based on the multi-scale soft/hard combined tissue characteristics of the human articular cartilage. The method is simple and low in cost, the prepared coating has good tribological property and high wear-resisting bearing capacity, and the titanium alloy can be obviously improved in the engineering fieldAnd the service life of the artificial joint as a friction part.

Description

Functional coating for bionic human body joint tissue structure and preparation method and application thereof
Technical Field
The invention belongs to the field of biomedical materials, material surface modification and micro-nano manufacturing, and particularly relates to a functional coating for a bionic human body joint tissue structure, and a preparation method and application thereof.
Background
As the human society moves into the aging stage, bone and joint injuries become one of the common diseases in people's lives. The number of people who need to receive joint replacement surgery is up to 5000 ten thousand worldwide due to various joint diseases, and the number of people who need artificial hip joint replacement therapy is more than 100 ten thousand every year. However, prosthetic joint replacements still have many undesirable problems to be solved, which are related to the causes of wear, lubrication, etc. of the sliding surfaces of the joints. How to solve the biocompatibility problems such as friction and abrasion between articular surfaces and 'abrasive dust disease' caused by abrasive dust is a challenge in the current research of artificial joints.
Titanium alloys have received much attention due to their low density, high specific strength, good corrosion resistance, biocompatibility, etc., and are increasingly important in the fields of medical treatment, biomechanics, etc. Unfortunately, titanium alloys are susceptible to adhesive wear and abrasive wear under the action of frictional contact stress due to low plastic shear resistance, low work hardenability, and high brittleness of oxide films formed on the surfaces, and have poor friction reducing and wear resisting properties, which greatly limits the application of titanium alloys as biomedical joints. In order to improve the friction performance of titanium alloy, researchers try to modify the surface of the titanium alloy by a bionic idea. Ren et al (Ren L, Wang T, Chen Z, et al. self-Lubricating PEO-PTFE Composite Coating on titanium metals,2019,9(2):170.) prepare hard TiO with porous structure on the surface of titanium alloy by micro-arc oxidation2Layer of PTFE filled into TiO by impregnation, sintering or the like2In the porous structure of (2), finallyAnd obtaining the PEO-PTFE composite coating with the friction-reducing and wear-resisting effects on the surface of the titanium alloy. However, in the method, the adopted micro-arc oxidation process is complex, the cost of the used electrolyte solution is high, and the environment is polluted; and the method does not carry out structural design on the coating at a bionic angle, and the obtained composite coating has good antifriction effect but weak bearing capacity.
The whole body of the human articular cartilage tissue presents a soft/hard combined structure, the surface layer soft material presents an extremely low friction coefficient, the bottom layer hard material provides extremely strong bearing capacity, and the bottom porous structure enhances the binding force of the soft/hard material, so the bionic simulation of the human articular cartilage structure is always a research hotspot in bionic tribology.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide a functional coating for a bionic human joint tissue structure and a preparation method and application thereof.
The invention provides a preparation method of a functional coating for a bionic human joint tissue structure, the preparation method is simple, the process is controllable, no pollutant is generated, and the prepared bionic functional coating has good tribological performance and high wear-resistant bearing capacity.
The purpose of the invention is realized by at least one of the following technical solutions.
The invention provides a preparation method of a functional coating for simulating a human joint tissue structure. The method comprises the following steps: firstly, a porous texture structure imitating skeleton is formed on the surface of titanium alloy by adopting a laser processing technology, and then a layer of titanium dioxide (TiO) is prepared on the surface of the titanium alloy with the porous structure by thermal oxidation treatment2) A hard film, and then a Polytetrafluoroethylene (PTFE) emulsion is uniformly coated on the porous TiO by a spin coating method2The surface of the hard film is put into a vacuum drying oven for drying, and finally the PTFE/TiO with the porous structure and the alternate hardness and softness is obtained on the surface of the titanium alloy2The composite functional coating (the functional coating of the bionic human joint tissue structure) has a tissue structure similar to that of human articular cartilage.
The invention provides a preparation method of a functional coating for bionic human joint tissue structure, which comprises the following steps:
(1) carrying out laser processing treatment on the surface of the titanium alloy, and washing to obtain the titanium alloy with the surface having a skeleton-like porous texture structure;
(2) heating the titanium alloy with the skeleton-like porous texture structure on the surface in the step (1) for thermal oxidation treatment, so that a layer of hard TiO is generated on the surface of the skeleton-like porous texture structure2Cooling the film to room temperature to obtain the TiO with the porous surface2Titanium alloys of hard films;
(3) porous TiO in the step (2)2Uniformly spin-coating polytetrafluoroethylene emulsion (PTFE emulsion) on the hard film, and drying to obtain the functional coating (porous structure alternate hard and soft PTFE/TiO) of the bionic human joint tissue structure2Composite functional coating).
Further, the surface roughness of the titanium alloy in the step (1) is less than 0.02 μm.
Preferably, the titanium alloy in the step (1) is TC4 titanium alloy.
Further, the scanning speed of the laser processing treatment in the step (1) is 2000-3000mm/s, and the scanning times are 20-40 times.
Preferably, the laser processing in step (1) has a laser wavelength of 355nm, a laser processing power of 2w, a laser processing pulse width of 15ns and a pulse repetition frequency of 300 kHz.
Further preferably, the number of scanning times of the laser processing treatment in the step (1) is 30.
Further, the skeleton-like porous texture structure in the step (1) is composed of a plurality of pore texture structures uniformly distributed on the surface of the titanium alloy, each pore texture structure is a square texture, the side length of the square texture is 150-250 μm, and the depth of the square texture is 40-80 μm; between each pore texture is an untextured area having a width of 60-80 μm.
Further, the washing manner in the step (1) comprises ultrasonic cleaning.
Preferably, after the laser treatment in step (1), the titanium alloy with the bone-like porous texture structure on the surface can be subjected to ultrasonic cleaning by using absolute ethyl alcohol.
Further preferably, the time of the ultrasonic cleaning is 15 min.
Further, the temperature of the thermal oxidation treatment in the step (2) is 650-.
Further, the solid content of the polytetrafluoroethylene emulsion in the step (3) is 40-80 wt%.
Preferably, the solid content of the polytetrafluoroethylene emulsion in the step (3) is 60 wt%.
Further, the polytetrafluoroethylene in the polytetrafluoroethylene emulsion in step (3) has an average particle size of 0.2 μm.
Further, the rotation speed of the spin coating in the step (3) is 900-; the drying mode comprises vacuum drying; the vacuum degree of the vacuum drying is 0.07-0.09MPa, the temperature of the vacuum drying is 60-80 ℃, and the time of the vacuum drying is 120-180 min.
Preferably, the drying in the step (3) is vacuum drying, the vacuum degree of the vacuum drying is 0.09MPa, the temperature of the vacuum drying is 80 ℃, and the time of the vacuum drying is 180 min.
The invention provides a functional coating of a bionic human body joint tissue structure, which is prepared by the preparation method.
The functional coating of the bionic human joint tissue structure provided by the invention can be applied to the preparation of artificial joints.
The invention starts from the characteristic of multi-scale soft/hard combined organization structure imitating human body joints, and porous TiO is prepared as the bottom layer on the surface of the titanium alloy2The surface layer of the hard film is a bionic functional coating of a PTFE self-lubricating coating. The preparation method is simple and convenient, the cost is low, and the prepared coating has excellent friction performance.
The functional coating with the bionic tissue structure characteristic is obtained by comprehensively utilizing the laser processing technology, the thermal oxidation treatment technology and the coating technology from the multi-scale soft/hard combined tissue characteristic of the human articular cartilage.
Compared with the prior art, the invention has the following advantages and beneficial effects:
(1) the preparation method provided by the invention adopts the laser processing technology and the thermal oxidation technology to prepare the TiO with the porous structure on the surface of the titanium alloy2The hard film has the advantages of accurate and controllable porous appearance, adjustable film thickness and no pollution in the preparation process;
(2) the functional coating of the bionic human body joint tissue structure provided by the invention adopts PTFE as a solid lubricating organic layer, so that the antifriction effect is excellent, and the price is low;
(3) the functional coating of the bionic human joint tissue structure combines the soft coating and the hard coating by taking the human joint structure as a simulation idea, has the advantages of low friction, low abrasion, high bearing capacity, long abrasion service life and the like under dry friction, has better tribological performance, and widens the application range of titanium alloy in the engineering field and the artificial joint field.
Drawings
FIG. 1 is SEM images of the surface of a titanium alloy with a skeletal porous texture structure on the surface prepared in step (1) of example 1 and SEM images of a functional coating of a bionic human joint tissue structure prepared in step (3).
FIG. 2 is an XRD contrast spectrum of the functional coating of the bionic human joint tissue structure prepared in example 1 and a PTFE and TiO2 film.
FIG. 3 is a comparison graph of the friction coefficient of the functional coating of the bionic human joint tissue structure prepared in example 1 and the two coatings in the comparative example.
FIG. 4 shows a functional coating of the bionic human joint tissue structure prepared in example 1 and TiO prepared in comparative example 12SEM images of the wear surfaces of the hard coating and the two friction pairing balls.
Detailed Description
The following examples are presented to further illustrate the practice of the invention, but the practice and protection of the invention is not limited thereto. It is noted that the processes described below, if not specifically described in detail, are all realizable or understandable by those skilled in the art with reference to the prior art. The reagents or apparatus used are not indicated to the manufacturer, and are considered to be conventional products available by commercial purchase.
Example 1
A method for preparing a functional coating for simulating a human joint tissue structure comprises the following steps:
(1) laser processing for preparing porous structure
A TC4 titanium alloy sample with the thickness of 40 multiplied by 20 multiplied by 5mm is taken, and the surface is polished to the surface roughness of less than 0.02 mu m. Scanning the polished titanium alloy surface under the conditions of 2W of laser power, 15ns of pulse width, 300kHz of pulse repetition frequency, 3000mm/s of scanning speed and 30 times of scanning times, and ultrasonically cleaning the polished titanium alloy surface in absolute ethyl alcohol for 15min after laser scanning to obtain the titanium alloy with a skeleton-like porous texture structure on the surface, wherein the skeleton-like porous texture structure is composed of a plurality of pore texture structures uniformly distributed on the titanium alloy surface, each pore texture structure is a square texture, the side length of the square texture is 200 mu m, and the depth of the square texture is 60 mu m; and an untextured area is arranged between each pore texture structure, the width of the untextured area is 60 mu m, and the texture and the untextured area are regularly arranged and uniformly distributed on the whole surface.
(2) Thermal oxidation treatment
Placing the titanium alloy with the surface having the skeleton-like porous texture structure obtained in the step (1) in a muffle furnace, heating to 700 ℃ and keeping for 300min to enable the surface of the skeleton-like porous texture structure to generate a layer of hard TiO2Cooling the film to room temperature along with the furnace to obtain the TiO with porous surface2Titanium alloy of hard film.
(3) Preparation of PTFE coating and vacuum drying treatment
The surface of the TiO with the pores obtained in the step (2)2The titanium alloy of the hard film was fixed on a spin coater, and the solid content was 60 wt% and the average particle diameter was 0.2. mu.mAnd dropping the PTFE emulsion m on the surface of a sample, uniformly coating the PTFE emulsion (polytetrafluoroethylene emulsion) on the surface of the sample under the process parameters of the rotation speed of 900rpm and the time of 40s, then placing the sample in a vacuum drying oven, and keeping the vacuum drying oven for 180min under the conditions of the vacuum degree of 0.09MPa and the temperature of 80 ℃ to obtain the functional coating of the bionic human body joint tissue structure.
Example 2
A method for preparing a functional coating for simulating a human joint tissue structure comprises the following steps:
(1) laser processing for preparing porous structure
A TC4 titanium alloy sample with the thickness of 40 multiplied by 20 multiplied by 5mm is taken, and the surface is polished to the surface roughness of less than 0.02 mu m. Scanning the polished titanium alloy surface under the conditions of 2W of laser power, 15ns of pulse width, 300kHz of pulse repetition frequency, 2000mm/s of scanning speed and 40 times of scanning times, and ultrasonically cleaning the polished titanium alloy surface in absolute ethyl alcohol for 15min after laser scanning to obtain the titanium alloy with a skeleton-like porous texture structure on the surface, wherein the skeleton-like porous texture structure is composed of a plurality of hole texture structures uniformly distributed on the titanium alloy surface, each hole texture structure is a square texture, the side length of the square texture is 150 micrometers, and the depth of the square texture is 80 micrometers; and an untextured area is arranged between each pore texture structure, the width of the untextured area is 80 mu m, and the texture and the untextured area are regularly arranged and uniformly distributed on the whole surface.
(2) Thermal oxidation treatment
Placing the titanium alloy with the surface having the skeleton-like porous texture structure obtained in the step (1) in a muffle furnace, heating to 650 ℃ and keeping for 300min to enable the surface of the skeleton-like porous texture structure to generate a layer of hard TiO2Cooling the film to room temperature along with the furnace to obtain the TiO with porous surface2Titanium alloy of hard film.
(3) Preparation of PTFE coating and vacuum drying treatment
The surface of the TiO with the pores obtained in the step (2)2The titanium alloy of the hard film was fixed on a spin coater, and a PTFE emulsion having a solid content of 40 wt% and an average particle diameter of 0.2 μm was dropped by a dropper onto the titanium alloyUniformly coating PTFE emulsion (polytetrafluoroethylene emulsion) on the surface of a sample under the process parameters of the rotating speed of 1000rpm and the time of 20s, then placing the sample in a vacuum drying oven, and keeping the vacuum degree of 0.07MPa and the temperature of 60 ℃ for 150min to obtain the functional coating of the bionic human body joint tissue structure.
Example 3
A method for preparing a functional coating for simulating a human joint tissue structure comprises the following steps:
(1) laser processing for preparing porous structure
A TC4 titanium alloy sample with the thickness of 40 multiplied by 20 multiplied by 5mm is taken, and the surface is polished to the surface roughness of less than 0.02 mu m. Scanning the polished titanium alloy surface under the conditions of 2W of laser power, 15ns of pulse width, 300kHz of pulse repetition frequency, 2500mm/s of scanning speed and 40 times of scanning times, and ultrasonically cleaning the polished titanium alloy surface in absolute ethyl alcohol for 15min after laser scanning to obtain the titanium alloy with a skeleton-like porous texture structure on the surface, wherein the skeleton-like porous texture structure consists of a plurality of hole texture structures uniformly distributed on the titanium alloy surface, each hole texture structure is a square texture, the side length of the square texture is 250 micrometers, and the depth of the square texture is 50 micrometers; and an untextured area is arranged between each pore texture structure, the width of the untextured area is 70 mu m, and the texture and the untextured area are regularly arranged and uniformly distributed on the whole surface.
(2) Thermal oxidation treatment
Placing the titanium alloy with the surface having the skeleton-like porous texture structure obtained in the step (1) in a muffle furnace, heating to 850 ℃ and keeping for 300min to enable the surface of the skeleton-like porous texture structure to generate a layer of hard TiO2Cooling the film to room temperature along with the furnace to obtain the TiO with porous surface2Titanium alloy of hard film.
(3) Preparation of PTFE coating and vacuum drying treatment
The surface of the TiO with the pores obtained in the step (2)2The titanium alloy of the hard film was fixed to a spin coater, and a PTFE emulsion having a solid content of 40 wt% and an average particle diameter of 0.2 μm was dropped by a dropper onto the surface of the sampleUniformly coating PTFE emulsion (polytetrafluoroethylene emulsion) on the surface of a sample under the process parameters of the rotating speed of 1200rpm and the time of 30s, then placing the sample in a vacuum drying oven, and keeping the vacuum degree of 0.09MPa and the temperature of 70 ℃ for 120min to obtain the functional coating of the bionic human body joint tissue structure.
Comparative example 1
Thermal oxidation treatment: placing the polished titanium alloy sample in a muffle furnace, wherein the size of the polished titanium alloy sample is TC4 titanium alloy sample with the size of 40 multiplied by 20 multiplied by 5mm, the surface roughness of the polished titanium alloy sample is less than 0.02 mu m, keeping the temperature of 700 ℃ for 300min, and then cooling the titanium alloy sample to room temperature along with the furnace to obtain TiO with smooth and non-textured surface2Hard film titanium alloy.
Comparative example 2
(1) Thermal oxidation treatment
Placing the polished titanium alloy sample in a muffle furnace, wherein the size of the polished titanium alloy sample is TC4 titanium alloy sample with the size of 40 multiplied by 20 multiplied by 5mm, the surface roughness of the polished titanium alloy sample is less than 0.02 mu m, keeping the temperature of 700 ℃ for 300min, and then cooling the titanium alloy sample to room temperature along with the furnace to obtain TiO with smooth and non-textured surface2Hard film titanium alloy.
(2) Preparation of PTFE coating and vacuum drying treatment
The TiO with smooth and non-textured surface obtained in the step (1)2Fixing the hard film titanium alloy on a spin coater, dripping PTFE emulsion with the solid content of 60 percent and the average grain diameter of 0.2 mu m on the surface of a sample by a dropper, uniformly coating the PTFE emulsion on the surface of the sample under the process parameters of the rotation speed of 900rpm and the time of 40s, then placing the sample in a vacuum drying box, keeping the vacuum degree of 0.09MPa and the temperature of 80 ℃ for 180min, and obtaining the non-texture PTFE/TiO on the surface of the titanium alloy2And (4) composite coating.
Coating observation and friction performance testing
The tribology test conditions were: a UMT friction and wear testing machine and a ball-disc friction mode are adopted to carry out a linear reciprocating friction experiment. The dual is GCr15 steel ball with the size of
Figure BDA0002219492210000101
The load is 20.0N, the linear reciprocating single stroke is 5.0mm, the friction speed is 10.0mm/s, and the friction time is 2400 s. The frictional wear properties of each coating in examples and comparative examples are shown in table 1.
TABLE 1
Figure BDA0002219492210000102
Fig. 1 (a) is a surface SEM image of the titanium alloy having a skeletal porous texture structure on the surface prepared in step (1) of example 1, fig. 1 (b) is a SEM image of the functional coating of the bionic human joint tissue structure prepared in step (3) of example 1, and it can be seen from fig. 1 that the titanium alloy sample in step (1) has a skeletal porous texture structure on the surface after laser treatment, and PTFE is successfully filled in the bionic functional coating in step (3).
FIG. 2 shows a functional coating of the bionic human joint tissue structure prepared in example 1, PTFE powder and TiO2The XRD comparison spectrogram of the film can be seen from FIG. 2 that the functional coating of the bionic human joint tissue structure prepared in example 1 simultaneously contains PTFE and TiO2Characteristic peak of (2). The PTFE powder is obtained by drying PTFE emulsion with the solid content of 60 wt% and the average grain diameter of 0.2 mu m; the TiO is2Film is TiO with smooth and non-texture surface prepared in comparative example 12TiO on hard film titanium alloy2Hard film, thickness 5.5 μm. The PTFE in fig. 2 is represented as PTFE powder; the biomimetic functional coating is represented as a functional coating of the biomimetic human joint tissue structure prepared in example 1; TiO22The coating is expressed as TiO2A film.
FIG. 3 is a friction coefficient curve diagram of the functional coating of the bionic human joint tissue structure prepared in example 1 and two coatings of comparative example 1 and comparative example 2, wherein the bionic functional coating of FIG. 3 is a functional coating of the bionic human joint tissue structure prepared in example 1, TiO2The coating was expressed as the smooth-surfaced untextured TiO prepared in comparative example 12Hard film titanium alloy, TiO without bionic structure2PTFE coating expressed as smooth-surfaced untextured TiO prepared in comparative example 22Hard film titanium alloy, TiO is shown in FIG. 32The coating (comparative example 1) has a high coefficient of friction and no texture structure PTFE/TiO2The friction coefficient of the composite coating (comparative example 2) fluctuates greatly, and finally the film is broken to reach a high friction coefficient, and the friction coefficient of the functional coating of the bionic human joint tissue structure prepared in the example 1 can keep a lower and more stable value.
Part (a) of FIG. 4 is a TiO having a smooth surface and no texture prepared in comparative example 12SEM image of hard thin film titanium alloy grinding scar surface, part (b) of FIG. 4 is SEM image of grinding scar surface of functional coating of bionic human body joint tissue structure prepared in example 1, and part (c) of FIG. 4 is smooth and non-textured TiO prepared in comparative example 12An SEM image of the surface of the rubbed mating ball of the hard film titanium alloy after the rubbing is performed, and a part (d) in FIG. 4 is the SEM image of the surface of the rubbed mating ball after the rubbing is performed with the functional coating of the bionic human joint tissue structure prepared in example 1. As can be seen from FIG. 4, the functional coating of the bionic human joint tissue structure prepared in example 1 has shallow and narrow wear scar and excellent wear resistance; the friction dual ball has small wear-spot diameter and good wear condition.
In conclusion, the functional coating of the bionic human joint tissue structure prepared in example 1 has the advantages of low friction, low wear, high bearing capacity and long wear life under dry friction. The functional coating of the bionic human joint tissue structure prepared by other embodiments can also show the advantages of low friction, low abrasion, high bearing capacity and long abrasion life under dry friction, and can be shown in reference to fig. 1, fig. 2, fig. 3 and fig. 4.
The above examples are only preferred embodiments of the present invention, which are intended to be illustrative and not limiting, and those skilled in the art should understand that they can make various changes, substitutions and alterations without departing from the spirit and scope of the invention.

Claims (9)

1. A preparation method of a functional coating simulating a human body joint tissue structure is characterized by comprising the following steps:
(1) carrying out laser processing treatment on the surface of the titanium alloy, and washing to obtain the titanium alloy with the surface having a skeleton-like porous texture structure;
(2) heating the titanium alloy with the skeleton-like porous texture structure on the surface in the step (1) for thermal oxidation treatment, so that a layer of hard TiO is generated on the surface of the skeleton-like porous texture structure2Film to obtain a film having porous TiO on the surface2Titanium alloys of hard films;
(3) porous TiO in the step (2)2Uniformly spin-coating polytetrafluoroethylene emulsion on the hard film, and drying to obtain the functional coating of the bionic human joint tissue structure;
the skeletal porous texture structure in the step (1) is composed of a plurality of pore texture structures uniformly distributed on the surface of titanium alloy, each pore texture structure is a square texture, the side length of the square texture is 150-250 mu m, and the depth of the square texture is 40-80 mu m; between each pore texture is an untextured area having a width of 60-80 μm.
2. The method for preparing a functional coating of a bionic human joint tissue structure according to claim 1, wherein the surface roughness of the titanium alloy in the step (1) is less than 0.02 μm.
3. The method for preparing a functional coating of a bionic human joint tissue structure as claimed in claim 1, wherein the scanning speed of the laser processing treatment in step (1) is 2000-3000mm/s, and the scanning times are 20-40.
4. The method for preparing a functional coating of a bionic human joint tissue structure according to claim 1, wherein the temperature of the thermal oxidation treatment in the step (2) is 650- > 850 ℃, and the time of the thermal oxidation treatment is 300- > 400 min.
5. The method for preparing a functional coating of a bionic human joint tissue structure according to claim 1, wherein the solid content of the polytetrafluoroethylene emulsion in the step (3) is 40-80 wt%.
6. The method for preparing a functional coating of a biomimetic human joint tissue structure according to claim 1, wherein the average particle size of the polytetrafluoroethylene in the polytetrafluoroethylene emulsion of step (3) is 0.2 μm.
7. The method for preparing a functional coating of a bionic human joint tissue structure according to claim 1, wherein the spin coating in step (3) has a rotation speed of 900-1200rpm and a spin coating time of 20-40 s; the drying mode comprises vacuum drying; the vacuum degree of the vacuum drying is 0.07-0.09MPa, the temperature of the vacuum drying is 60-80 ℃, and the time of the vacuum drying is 120-180 min.
8. A functional coating of a biomimetic human joint tissue structure made by the method of any of claims 1-7.
9. Use of a functional coating of a biomimetic human joint tissue structure as described in claim 8 for the preparation of an artificial joint.
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