High-strength carbon fiber composite material and preparation method thereof

Abstract

The invention discloses a high-strength carbon fiber composite material and a preparation method thereof, the composite material comprises a modified carbon fiber reinforcement and a biocorrosion-resistant resin matrix, and a bioinert coating is formed on the surface of the carbon fiber reinforcement through surface treatment; based on compounding of the modified carbon fiber reinforcement and the resin matrix, the composite material shows excellent mechanical performance and biological stability and is suitable for the field of medical implants, and the biological inert coating is titanium nitride. According to the preparation method, the biological corrosion resistance of the carbon fiber composite material can be improved by performing surface treatment and modification on the carbon fiber composite material, the modified carbon fiber reinforcement can be soaked in the prepolymer solution, and selection of the prepolymer solution needs to consider that a cured resin matrix can have the biological corrosion resistance characteristic; therefore, the device adapts to the application environment of medical implants.

Description

Technical Field

[0001] The present invention relates to the technical field of carbon fiber composite materials, and in particular to a high-strength carbon fiber composite material and a preparation method thereof. Background Art

[0002] Carbon fiber composites, due to their excellent performance, have been widely used in a variety of fields, including aerospace, automotive manufacturing, medical fields, and construction materials. However, when these materials are considered for use in the medical field, they face a problem: due to the special properties of the carbon fiber composite surface, they may be subject to biocorrosion in biological environments. This is because they react with biological fluids in the body, resulting in material performance degradation or adverse reactions, which limits their application in medical devices and implants. Therefore, there is a need for high-strength carbon fiber composites to improve the practical strength of carbon fiber composites for medical use. Summary of the Invention

[0003] The purpose of this section is to summarize some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract and title of this application to avoid obscuring the purpose of this section, the abstract and the title of the invention, and such simplifications or omissions should not be used to limit the scope of the present invention.

[0004] In view of the above problems existing in the existing high-strength carbon fiber composite materials and preparation methods thereof, the present invention is proposed.

[0005] Therefore, an object of the present invention is to provide a high-strength carbon fiber composite material and a preparation method thereof, which are used to solve the problem that the carbon fiber composite material may suffer from biological corrosion in a biological environment.

[0006] To solve the above technical problems, the present invention provides the following technical solutions: a high-strength carbon fiber composite material, comprising a modified carbon fiber reinforcement and a bio-corrosion-resistant resin matrix, wherein the modification is performed by surface treatment to form a bio-inert coating on the surface of the carbon fiber reinforcement;

[0007] Based on the composite of the modified carbon fiber reinforcement and the resin matrix, the composite material exhibits excellent mechanical properties and biological stability and is suitable for use in the field of medical implants.

[0008] As a preferred embodiment of the high-strength carbon fiber composite material and the preparation method thereof according to the present invention, the bio-inert coating is titanium nitride.

[0009] As a preferred embodiment of the high-strength carbon fiber composite material and the preparation method thereof of the present invention, the bioinert coating is zirconium oxide.

[0010] As a preferred embodiment of the high-strength carbon fiber composite material and the preparation method thereof according to the present invention, the bio-inert coating is a diamond-like carbon material.

[0011] As a preferred embodiment of the high-strength carbon fiber composite material and its preparation method of the present invention, the bio-inert coating is selected from but not limited to two or more of titanium nitride, zirconium oxide or diamond-like carbon.

[0012] A method for preparing a high-strength carbon fiber composite material, the method being applied to the composite material according to claim 1, comprising the following steps:

[0013] S1. Forming a bio-inert coating on the surface of the carbon fiber reinforcement through surface modification treatment;

[0014] S2. Immersing the surface-treated carbon fiber reinforcement in a prepolymer solution, followed by curing and molding to obtain the composite material.

[0015] As a preferred embodiment of the high-strength carbon fiber composite material and the preparation method thereof of the present invention, the step of selecting a suitable prepolymer solution based on the size and shape of the carbon fiber reinforcement comprises:

[0016] Sa1. Determine the average diameter D of the carbon fiber reinforcement;

[0017] Sa2. Calculate the viscosity η of the prepolymer solution based on D, where η = k*D^n, where k and n are constants;

[0018] Sa3. Determine whether η satisfies the preset range [η_min, η_max];

[0019] Sa4. If η is within [η_min, η_max], then the prepolymer solution is selected.

[0020] As a preferred embodiment of the high-strength carbon fiber composite material and the preparation method thereof according to the present invention, the step of calculating the viscosity η of the prepolymer solution based on D comprises:

[0021] Sa11, measure the diameter D of the carbon fiber reinforcement;

[0022] Sa12. Calculate η based on D, where η = k*D^n, where k and n are constants determined experimentally;

[0023] Sa13. Detect the concentration of η and control η to be within [η_min,η_max] by increasing or decreasing the concentration of the prepolymer solution.

[0024] As a preferred embodiment of the high-strength carbon fiber composite material and its preparation method of the present invention, the steps of forming the bio-inert coating include:

[0025] Sb1, placing the carbon fiber reinforcement in a vacuum environment;

[0026] Sb2, introduce inert gas based on vacuum environment;

[0027] Sb3, depositing the coating material using physical vapor deposition;

[0028] Sb4. Control deposition temperature and time to ensure coating uniformity.

[0029] As a preferred embodiment of the high-strength carbon fiber composite material and its preparation method of the present invention, the step of depositing the coating material by physical vapor deposition comprises:

[0030] Sb11. Select an appropriate deposition method based on the coating material, such as ion beam assisted deposition;

[0031] Sb12, setting the ion beam energy E1, where E1 is 50 to 200 eV;

[0032] Sb13, calculate the deposition rate v1 and ensure that v1 remains between 1 and 1 nm / s;

[0033] Sb14. Determine whether the deposition rate v1 meets the requirements. If not, adjust the ion beam energy E1 until v1 meets the requirements.

[0034] Beneficial effects of the present invention:

[0035] The present invention can improve the biocorrosion resistance of carbon fiber composite materials by surface treatment and modification of the carbon fiber composite materials. The modified carbon fiber reinforcement will be immersed in a prepolymer solution. The selection of the prepolymer solution needs to consider whether the resin matrix after curing can have the characteristics of biocorrosion resistance to adapt to the application environment of medical implants. DETAILED DESCRIPTION

[0036] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below.

[0037] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0038] Secondly, the term "one embodiment" or "embodiment" herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in various places throughout this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive of other embodiments.

[0039] The present invention provides a high-strength carbon fiber composite material, which includes a modified carbon fiber reinforcement and a bio-corrosion-resistant resin matrix. The modification is performed by surface treatment to form a bio-inert coating on the surface of the carbon fiber reinforcement.

[0040] The bioinert coating is selected from but not limited to one or more of titanium nitride, zirconium oxide or diamond-like carbon;

[0041] Based on the composite of the modified carbon fiber reinforcement and the resin matrix, the composite material exhibits excellent mechanical properties and biological stability and is suitable for use in the field of medical implants.

[0042] The modification steps of carbon fiber reinforcement are as follows:

[0043] S101: The carbon fiber reinforcement is modified by surface treatment technology to form a bio-inert coating on its surface. This process is one of the key steps in the entire preparation method, which ensures that the final composite material has good biocompatibility and corrosion resistance. Surface treatment can be carried out in a variety of ways, such as plasma treatment, chemical vapor deposition (CVD), physical vapor deposition (PVD), etc. Among them, plasma treatment is a commonly used method that can effectively change the chemical properties of the carbon fiber surface and improve the interfacial bonding between it and the resin matrix. For example, during the plasma treatment process, oxygen plasma can be used to clean the carbon fiber surface and introduce oxygen-containing functional groups, which helps the adhesion of subsequent coatings. In addition, a layer of bio-inert materials such as titanium nitride (TiN), zirconium oxide (ZrO2), or diamond-like carbon (DLC) can be deposited on the carbon fiber surface using CVD or PVD technology. These materials not only have good biocompatibility, but can also effectively prevent corrosive substances in biological fluids from corroding the carbon fibers, thereby ensuring the stability and durability of the composite material in the biological environment. For example, using PVD technology to deposit a TiN coating with a thickness of about 50 nanometers can significantly improve the biostability of carbon fibers while maintaining their original mechanical strength.

[0044] S102: A high-strength carbon fiber composite material is prepared by impregnating the surface-treated carbon fiber reinforcement in a prepolymer solution and then curing and molding it. At this stage, it is crucial to select a suitable resin matrix because the resin must not only be able to withstand corrosion in the biological environment, but also have good compatibility with the bio-inert coating on the carbon fiber surface. Commonly used resin matrices include epoxy resin, polyimide, polyetheretherketone (PEEK), etc. These resins have high mechanical strength and chemical corrosion resistance and are suitable for use in medical implants. During the preparation process, the prepolymer must first be dissolved in an appropriate solvent to form a solution, and then the surface-treated carbon fiber reinforcement is impregnated in the solution to ensure that the carbon fiber is evenly wrapped. Next, curing is performed through processes such as hot pressing or vacuum-assisted resin transfer molding (VARTM) to fully cure the resin and tightly bond it to the carbon fiber. For example, epoxy resin can be used as a matrix, and the carbon fiber treated with TiN coating can be impregnated in an epoxy resin solution, and then cured at a certain temperature to form a high-strength and bio-corrosion-resistant composite material.

[0045] The above steps address the issue of biocorrosion susceptibility when used as a medical material. Forming a bioinert coating on the carbon fiber surface through surface treatment technology not only improves the biocompatibility and corrosion resistance of the composite material, but also strengthens the interfacial bonding between the carbon fiber and the resin matrix, thereby ensuring the long-term stability and reliability of the composite material in the medical implant field.

[0046] Specific steps of a method for preparing a high-strength carbon fiber composite material:

[0047] S201: The composite material preparation process begins by placing carbon fiber reinforcements that have undergone a specific surface treatment into a mold. This surface treatment is intended to improve the interfacial bonding between the carbon fibers and the subsequent resin matrix, thereby enhancing the overall performance of the final composite material. For example, the carbon fibers can be treated with chemical oxidation to increase the number of surface active sites, thereby improving adhesion to the resin.

[0048] S202: Further processing is performed by selecting an appropriate prepolymer solution based on the size and shape of the carbon fiber reinforcement. The prepolymer is selected based on its flowability and curing characteristics to ensure uniform coverage and penetration into the carbon fiber structure. For example, for carbon fiber reinforcements with complex geometries, a low-viscosity epoxy prepolymer can be selected to better fill voids and form a continuous resin phase.

[0049] S203: The carbon fiber reinforcement prepared above is immersed in the prepolymer solution to ensure that the carbon fibers are completely soaked. This step is usually performed under vacuum conditions to eliminate air bubbles and promote deeper penetration of the resin into the carbon fibers. For example, the carbon fiber reinforcement can be immersed in the prepolymer bath under vacuum pressure for a period of time until the resin is observed to completely soak the carbon fibers.

[0050] S204: Finally, the composite material is obtained by curing. This process involves heating the impregnated carbon fiber reinforcement to an appropriate temperature to cause the prepolymer to undergo a cross-linking reaction and solidify. For example, the mold containing the impregnated carbon fibers can be placed in an oven and maintained at a certain temperature, such as 150°C, for several hours to complete the resin curing process, thereby obtaining the desired high-strength carbon fiber composite material.

[0051] Next, the specific steps for selecting a prepolymer solution in a high-strength carbon fiber composite material and a preparation method thereof are as follows:

[0052] S301: First, determine the average diameter D of the carbon fiber reinforcement. This step is completed by measuring the diameter of the carbon fiber reinforcement and calculating the average value. This step ensures that the subsequent prepolymer solution selected is compatible with the specific size of the carbon fiber, thereby improving the overall performance of the composite material.

[0053] S302: Next, the viscosity η of the prepolymer solution is calculated based on the determined average diameter D, where η = k*D^n, where k and n are constants determined based on experimental data. This formula accurately calculates the viscosity of the prepolymer solution suitable for a specific carbon fiber reinforcement, ensuring that the prepolymer is evenly distributed and fully penetrates the carbon fibers during the impregnation process.

[0054] S303: Then, determine whether the calculated viscosity η satisfies a preset range [η_min, η_max]. This range is pre-set based on the process requirements during composite material preparation to ensure that the prepolymer solution has appropriate fluidity, neither too thin to cause insufficient impregnation nor too thick to affect impregnation efficiency.

[0055] S304: Finally, if the calculated viscosity η is within the preset range [η_min, η_max], the prepolymer solution is selected for subsequent composite material preparation. This step ensures that the selected prepolymer solution can effectively impregnate the carbon fiber reinforcement and form a high-strength composite material during the subsequent curing process.

[0056] For example, suppose we have determined the average diameter D of the carbon fiber reinforcement to be 7 microns, the constant k determined experimentally to be 0.005 Pa·s / μm^2, and n to be 1.5. Using the formula η = k*D^n, we can calculate the viscosity of the prepolymer solution as η = 0.005*7^1.5 ≈ 0.12 Pa·s. If the preset viscosity range is [0.1 Pa·s, 0.2 Pa·s], the calculated viscosity η = 0.12 Pa·s falls within this range, so this prepolymer solution can be selected for subsequent composite material preparation.

[0057] Next, the specific steps of calculating the viscosity η of the prepolymer solution based on the diameter D of the carbon fiber reinforcement in a high-strength carbon fiber composite material and a preparation method thereof are as follows:

[0058] S401: Accurately measure the diameter D of the carbon fiber reinforcement using precision measuring tools, such as a microscope or a laser scattering instrument. This step ensures the accuracy of the data used in the subsequent calculation of the viscosity η.

[0059] S402: Calculate the viscosity η of the prepolymer solution using the formula η=k*D^n, where k and n are constants determined through previous experiments. The selection of these constants depends on the specific material properties and the desired final product performance.

[0060] S403: Compare the calculated viscosity η with a preset minimum viscosity threshold η_min. If η is less than η_min, the viscosity of the solution needs to be increased by increasing the solid content in the prepolymer solution to meet the process requirements.

[0061] S404: Similarly, if the calculated viscosity η is greater than the maximum allowable viscosity threshold η_max, the viscosity of the solution needs to be lowered by reducing the solid content in the prepolymer solution to ensure that it is suitable for subsequent processing.

[0062] Through the above steps, the viscosity of the prepolymer solution can be effectively controlled, thereby ensuring that the high-strength carbon fiber composite material finally obtained has excellent performance.

[0063] Next, the specific steps for adjusting the viscosity of the prepolymer solution in a high-strength carbon fiber composite material and a preparation method thereof are as follows:

[0064] S501: First, when the viscosity η of the prepolymer solution is detected to be less than a predetermined minimum viscosity threshold η_min, measures are taken to increase the viscosity of the solution. This process begins with accurately measuring the current viscosity η of the prepolymer solution to ensure the accuracy of the obtained data. The measurement method can be performed using a rotational viscometer or other suitable viscosity measuring equipment.

[0065] S502: Next, the required solute concentration C is calculated based on the difference Δη between the measured viscosity η and the required minimum viscosity η_min. Specifically, the required concentration increase is determined using the formula C = m*η_min - η, where m is a pre-set proportional coefficient used to adjust the rate of increasing the solute concentration to ensure that the viscosity can be stably and effectively increased to the target level.

[0066] S503: Then, an appropriate amount of solute is added to the prepolymer solution to increase the concentration of the solution. The solute should be selected so as not to affect the performance of the final product and to effectively increase the viscosity of the solution. The solute addition process should be performed under stirring conditions to ensure that the solute is evenly dispersed in the solution.

[0067] S504: Finally, after adding the solute, the viscosity η of the prepolymer solution is measured again to verify whether it has reached or exceeded the required minimum viscosity η_min. If the viscosity is still below η_min, the above steps are repeated, further adding solute until the viscosity meets the requirement. This process may require multiple iterations until the viscosity reaches or exceeds η_min.

[0068] Through the above steps, the viscosity of the prepolymer solution can be effectively controlled, thereby ensuring that the high-strength carbon fiber composite material prepared subsequently has good performance and consistency.

[0069] Next, the specific steps for increasing the concentration of the prepolymer solution in a high-strength carbon fiber composite material and a preparation method thereof are as follows:

[0070] S601: Determine the concentration required to increase

[0071] First, based on the process requirements and the performance indicators of the final product, determine the target value C to which the concentration of the prepolymer solution needs to be increased. The selection of this target value should be based on a comprehensive consideration of material properties, processing conditions, and cost-effectiveness.

[0072] S602: Calculate the amount of solute required to be added

[0073] Next, the amount of solute to be added, W, is calculated based on the volume V of the prepolymer solution and the density ρ of the selected solute using the formula W = V*C / ρ. Here, V represents the volume of the prepolymer solution, C is the target concentration increment determined previously, and ρ is the density of the solute.

[0074] S603: Add solute and stir evenly

[0075] After calculating the amount of solute required, accurately weigh W and add it to the prepolymer solution. Then, use an appropriate stirring device, such as a magnetic stirrer or mechanical stirrer, to thoroughly stir the mixture until the solute is completely dissolved in the prepolymer solution, ensuring a uniform concentration.

[0076] Next, the specific steps of forming a bio-inert coating in a high-strength carbon fiber composite material and a preparation method thereof are as follows:

[0077] S701: By placing the carbon fiber reinforcement in a vacuum environment - In this stage, a sealed chamber capable of maintaining a high vacuum level must be prepared. The pre-treated carbon fiber reinforcement is placed in the chamber, and the vacuum pump system is activated to gradually reduce the pressure in the chamber until the required vacuum level is reached. This step helps remove air and other possible impurities from the carbon fiber surface, providing a clean and oxygen-free environment for subsequent coating deposition.

[0078] S702: Introducing an inert gas based on a vacuum environment - Once the vacuum level in the chamber reaches a predetermined value, an inert gas, such as argon or nitrogen, is introduced into the chamber. This inert gas not only maintains a stable pressure within the chamber but also acts as a carrier gas during the physical vapor deposition process, helping to evenly distribute the coating material particles within the chamber, thereby improving coating quality.

[0079] S703: Depositing the coating material using physical vapor deposition (PVD) - Physical vapor deposition (PVD) is a common surface modification technique that uses high temperatures to evaporate or sublimate a solid coating material into a gaseous state. These gaseous particles then recondense into a solid film on the substrate surface. In this method, a suitable coating material, such as a bio-inert material like TiN or SiO2, is selected and heated to a vaporized state using PVD equipment. With the aid of an inert gas, these gaseous particles are deposited onto the surface of the carbon fiber reinforcement, forming a uniform, bio-inert coating.

[0080] S704: Controlling Deposition Temperature and Time to Ensure Coating Uniformity - Deposition temperature and time are two key parameters in the PVD process. Appropriate temperature promotes efficient evaporation of the coating material, while a reasonable time ensures uniform and controllable coating thickness. Therefore, precise control of temperature and time during the PVD process is necessary to ensure that the resulting bio-inert coating is both uniform and dense, thereby improving the overall performance of the carbon fiber composite.

[0081] Next, the specific steps of introducing inert gas in a vacuum environment in a high-strength carbon fiber composite material and a preparation method thereof are as follows:

[0082] S801: By adjusting the pressure in the vacuum chamber - First, the pressure in the vacuum chamber is adjusted to a specific range, namely P1, where the value of P1 should be between 10^6 and 10^3 Torr. This process can be achieved through a vacuum pump system, by precisely controlling the operating state of the vacuum pump to achieve the required vacuum level. For example, a high-precision pressure sensor can be used to monitor the actual pressure in the vacuum chamber and compare it with the set value P1. A feedback control system can then automatically adjust the operating parameters of the vacuum pump, such as the speed or the on-time, to ensure that the pressure remains stable within the target range.

[0083] S802: By introducing inert gas Ar and controlling its flow rate - After reaching the desired pressure P1, begin introducing inert gas argon Ar into the vacuum chamber while controlling the Ar flow rate F1 to maintain between 20 and 50 sccm. This step can be accomplished using a gas supply system equipped with a precision mass flow controller. For example, a mass flow controller with a built-in microprocessor can be used. This controller can accurately control the flow rate of the Ar gas according to the preset flow value F1, ensuring a stable and accurate flow rate.

[0084] S803: Calculate Ar partial pressure P2 based on Ar flow rate and vacuum chamber volume - Based on the known Ar flow rate F1 and the volume of the vacuum chamber V, use the ideal gas state equation to calculate the Ar partial pressure P2 within the vacuum chamber. This calculation can be performed using specialized software or pre-programmed formulas. For example, assuming the volume of the vacuum chamber is V = 100L and the Ar flow rate F1 = 30 sccm, at a given temperature, the ideal gas state equation PV = nRT can be used to calculate the Ar partial pressure P2, ensuring that P2 is between 1 and 1 Pa.

[0085] S804: Determine whether P2 meets the requirements. If not, adjust the Ar flow rate until P2 meets the requirements. Finally, check whether the calculated Ar partial pressure P2 meets the 1 to 1 Pa requirement. If not, recalculate P2 by adjusting the Ar flow rate F1 until P2 falls within the specified range. For example, if the calculated P2 is less than 1 Pa, the Ar flow rate F1 can be appropriately increased; conversely, if P2 is greater than 1 Pa, the Ar flow rate F1 should be reduced. This process can be completed manually or automatically through an automated control system to ensure that the final Ar partial pressure P2 meets the requirements.

[0086] Next, the specific steps of depositing a coating material using a physical vapor deposition method in a high-strength carbon fiber composite material and a preparation method thereof are as follows:

[0087] S901: The process begins by selecting an appropriate deposition method, such as ion beam assisted deposition (IBAD). This method effectively improves the bonding strength between the coating material and the substrate and helps form a dense, uniform coating. When selecting a deposition method, the properties of the coating material and the desired coating performance should be considered.

[0088] S902: Control the particle kinetic energy during the deposition process by setting the energy E1 of the ion beam. The range of E1 is preferably 50 to 200 electron volts (eV). This energy range helps promote the diffusion and rearrangement of the coating material atoms or molecules on the substrate surface, thereby obtaining a higher quality coating.

[0089] S903: The deposition rate v1 is calculated and maintained between 1 and 10 nm / s to ensure a controllable and uniform coating thickness. A deposition rate that is too fast may result in reduced coating quality, while a rate that is too slow may reduce production efficiency. Therefore, the deposition rate must be precisely controlled to achieve optimal results.

[0090] S904: Determine whether the currently set deposition rate v1 meets the above conditions. If not, adjust the ion beam energy E1 until v1 meets the requirements. This dynamic adjustment mechanism ensures that the ideal deposition rate is maintained throughout the deposition process, thereby ensuring the quality and consistency of the coating.

[0091] Next, the specific steps of controlling the deposition temperature and time to ensure coating uniformity in a high-strength carbon fiber composite material and a preparation method thereof are described:

[0092] S1001: Set deposition temperature

[0093] During the preparation of high-strength carbon fiber composites, the deposition temperature T1 must first be set, preferably between 200 and 400 degrees Celsius. This temperature range is chosen to ensure that the coating material is effectively deposited on the substrate surface and forms a uniform coating. Too low a temperature will prevent the coating material from fully melting and adhering to the substrate surface, while too high a temperature may cause the coating material to decompose or damage the substrate.

[0094] S1002: Calculate the required deposition time

[0095] Next, the required deposition time t1 is calculated based on the desired coating thickness d1 and the known deposition rate v1. The deposition rate v1 refers to the thickness of the coating material formed on the substrate surface per unit time. The deposition time required to achieve the desired coating thickness can be calculated using the formula t1 = d1 / v1. This calculation process ensures that the coating thickness accurately meets the design requirements.

[0096] S1003: Adjust deposition time and temperature

[0097] The calculated deposition time t1 should fall within the range of 1 to 10 hours to ensure coating uniformity. If the calculated t1 exceeds this range, the deposition temperature T1 needs to be adjusted. For example, if t1 is less than 1 hour, the deposition temperature T1 can be appropriately lowered; conversely, if t1 is greater than 10 hours, the deposition temperature T1 can be appropriately increased. Repeat this adjustment until t1 falls within the range of 1 to 10 hours, thereby ensuring coating uniformity and the desired thickness.

[0098] Through the above steps, the deposition process of the coating can be effectively controlled to ensure that the high-strength carbon fiber composite material finally produced has good performance and consistency.

[0099] Next, the specific steps of a high-strength carbon fiber composite material and its preparation method with specific characteristics are as follows:

[0100] S1101: The preparation process begins by preheating the carbon fiber reinforcement to a specified temperature T2, where T2 is set between 80 and 120 degrees Celsius. This preheating step helps improve the bonding efficiency between the prepolymer solution and the carbon fiber during the subsequent impregnation process and ensures that the carbon fiber surface can better absorb the prepolymer solution.

[0101] S1102: Calculate the appropriate immersion time t2 based on the viscosity η1 of the prepolymer solution and the surface area A1 of the carbon fiber reinforcement. This calculation process ensures that the prepolymer solution can fully penetrate the carbon fiber reinforcement under appropriate conditions, thereby forming a uniform and high-strength composite material structure.

[0102] S1103: Ensure that the calculated impregnation time t2 is within the range of 10 to 60 minutes. If the impregnation time is too short, the prepolymer may not be fully impregnated; if it is too long, the prepolymer may be over-cured or the carbon fibers may be damaged. Therefore, controlling the impregnation time is crucial to obtaining high-quality composite materials.

[0103] S1104: Determine whether the calculated immersion time t2 meets the above conditions. If not, recalculate immersion time t2 by adjusting the viscosity η1 of the prepolymer solution until the desired immersion time range is reached. This adjustment can be achieved by increasing or decreasing the solvent content in the prepolymer solution to change its viscosity characteristics.

[0104] Example 1

[0105] This embodiment provides a high-strength carbon fiber composite material, comprising a modified carbon fiber reinforcement and a bio-corrosion-resistant resin matrix, wherein the modification is performed by surface treatment to form a bio-inert coating on the surface of the carbon fiber reinforcement;

[0106] The bioinert coating is titanium nitride;

[0107] The preparation steps of high-strength carbon fiber composite materials are as follows:

[0108] S101: Modifying carbon fiber reinforcements through surface treatment technology to form a bio-inert coating on their surface. Plasma treatment is used. During the plasma treatment process, oxygen plasma can be used to clean the carbon fiber surface and introduce oxygen-containing functional groups. PVD technology is used to deposit a TiN coating with a thickness of approximately 50 nanometers.

[0109] S102: A high-strength carbon fiber composite material is prepared by impregnating a surface-treated carbon fiber reinforcement in a prepolymer solution and then curing and molding. The resin matrix is ​​epoxy resin. First, the prepolymer needs to be dissolved in an appropriate solvent to prepare a solution. The epoxy resin is used as the matrix, and the carbon fiber treated with TiN coating is impregnated in the epoxy resin solution. It is then cured at a certain temperature to form a high-strength and bio-corrosion-resistant composite material.

[0110] Example 2

[0111] This embodiment provides a high-strength carbon fiber composite material, comprising a modified carbon fiber reinforcement and a bio-corrosion-resistant resin matrix, wherein the modification is performed by surface treatment to form a bio-inert coating on the surface of the carbon fiber reinforcement;

[0112] The bioinert coating is zirconium oxide;

[0113] The preparation steps of high-strength carbon fiber composite materials are as follows:

[0114] S101: Modifying carbon fiber reinforcements through surface treatment techniques to form a bio-inert coating on their surface. Plasma treatment is used. During the plasma treatment process, oxygen plasma can be used to clean the carbon fiber surface and introduce oxygen-containing functional groups. A zirconium oxide coating is deposited using PVD technology.

[0115] S102: A high-strength carbon fiber composite material is prepared by impregnating a surface-treated carbon fiber reinforcement in a prepolymer solution and then curing and molding it. The resin matrix is ​​polyimide. First, the prepolymer needs to be dissolved in an appropriate solvent to prepare a solution. Using polyimide as the matrix, the zirconium oxide-coated carbon fiber is impregnated in the polyimide solution and then cured at a certain temperature to form a high-strength and bio-corrosion-resistant composite material.

[0116] In actual operation, when this device is used, the carbon fiber reinforcement needs to be surface treated first. This process is intended to improve the bonding strength between the carbon fiber and the subsequent resin matrix and form a bio-inert coating on its surface. The coating can be made of one or more materials such as titanium nitride, zirconium oxide or diamond-like carbon. The selection of these materials can not only ensure that the coating has good biocompatibility and biostability, but also significantly improve the overall performance of the composite material. After the surface treatment is completed, the modified carbon fiber reinforcement will be immersed in a prepolymer solution. The selection of the prepolymer solution needs to consider whether the cured resin matrix can have the characteristics of biocorrosion resistance to adapt to the application environment of medical implants. During the impregnation process, the carbon fiber reinforcement is in full contact with the prepolymer solution to ensure that each fiber is evenly wrapped. Subsequently, through an appropriate curing process, such as heating or light, the prepolymer undergoes a chemical reaction and is finally cured to form a high-strength carbon fiber composite material. During the entire preparation process, the surface modification of carbon fiber reinforcements, the selection of resin matrix, and the control of curing conditions are key steps that work together to determine the mechanical properties and biostability of the final composite material, enabling it to play an important role in the field of medical implants.

[0117] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A high-strength carbon fiber composite material, characterized in that The composite material includes a modified carbon fiber reinforcement and a bio-corrosion-resistant resin matrix, wherein the modification forms a bio-inert coating on the surface of the carbon fiber reinforcement through surface treatment; Based on the composite of the modified carbon fiber reinforcement and the resin matrix, the composite material exhibits excellent mechanical properties and biological stability and is suitable for use in the field of medical implants.

2. The high-strength carbon fiber composite material according to claim 1, characterized in that: The bioinert coating is titanium nitride.

3. The high-strength carbon fiber composite material according to claim 1, characterized in that: The bioinert coating is zirconium oxide.

4. The high-strength carbon fiber composite material according to claim 1, characterized in that: The bioinert coating is a diamond-like carbon material.

5. The high-strength carbon fiber composite material according to claim 1, characterized in that: The bioinert coating is selected from, but not limited to, two or more of titanium nitride, zirconium oxide, or diamond-like carbon.

6. A method for preparing a high-strength carbon fiber composite material, characterized in that: The preparation method is applied to the composite material according to any one of claims 1 to 5, comprising the following steps: S1. Forming a bio-inert coating on the surface of the carbon fiber reinforcement through surface modification treatment; S2. Immersing the surface-treated carbon fiber reinforcement in a prepolymer solution, followed by curing and molding to obtain the composite material.

7. The method for preparing a high-strength carbon fiber composite material according to claim 6, characterized in that: The step of selecting a suitable prepolymer solution based on the size and shape of the carbon fiber reinforcement comprises: Sa1. Determine the average diameter D of the carbon fiber reinforcement; Sa2. Calculate the viscosity η of the prepolymer solution based on D, where η = k*D^n, where k and n are constants; Sa3. Determine whether η satisfies the preset range [η_min, η_max]; Sa4. If η is within [η_min, η_max], then the prepolymer solution is selected.

8. The method for preparing a high-strength carbon fiber composite material according to claim 7, characterized in that: The step of calculating the viscosity η of the prepolymer solution based on D comprises: Sa11, measure the diameter D of the carbon fiber reinforcement; Sa12. Calculate η based on D, where η = k*D^n, where k and n are constants determined experimentally; Sa13. Detect the concentration of η and control η to be within [η_min,η_max] by increasing or decreasing the concentration of the prepolymer solution.

9. The method for preparing a high-strength carbon fiber composite material according to claim 6, characterized in that: The steps of forming the bioinert coating include: Sb1, placing the carbon fiber reinforcement in a vacuum environment; Sb2, introducing inert gas based on vacuum environment; Sb3, depositing the coating material using physical vapor deposition; Sb4. Control deposition temperature and time to ensure coating uniformity.

10. The method for preparing a high-strength carbon fiber composite material according to claim 9, characterized in that: The steps for depositing the coating material using physical vapor deposition include: Sb11. Select an appropriate deposition method based on the coating material, such as ion beam assisted deposition; Sb12, setting the ion beam energy E1, where E1 is 50 to 200 eV; Sb13, calculate the deposition rate v1 and ensure that v1 remains between 1 and 1 nm / s; Sb14. Determine whether the deposition rate v1 meets the requirements. If not, adjust the ion beam energy E1 until v1 meets the requirements.