A carbon fiber reinforced biomimetic nacre ceramic matrix composite material and its preparation method

Abstract

This invention belongs to the field of materials synthesis and processing technology, specifically relating to a carbon fiber reinforced biomimetic nacre ceramic matrix composite material and its preparation method. The preparation method includes: drawing a three-dimensional model of the nacre biomimetic ceramic scaffold and performing reduction photopolymerization 3D printing to obtain an Al2O3 green body; separating the support structure from the Al2O3 green body; sequentially cleaning the Al2O3 green body, removing uncured slurry, ultrasonically cleaning, curing, and drying to obtain a fully treated Al2O3 green body; degreasing and sintering the fully treated Al2O3 green body to obtain the nacre biomimetic ceramic scaffold; and filling the nacre biomimetic ceramic scaffold with carbon fiber epoxy resin filler to obtain the carbon fiber reinforced biomimetic nacre ceramic matrix composite material. This invention utilizes reduction photopolymerization 3D printing technology to obtain the nacre biomimetic ceramic scaffold. By filling with carbon fiber reinforced epoxy resin filler, cracks can be deflected and impeded during fracture, thereby increasing the toughness of the composite material.

Description

Technical Field

[0001] This invention belongs to the field of materials synthesis and processing technology, specifically relating to a carbon fiber reinforced biomimetic nacre ceramic matrix composite material and its preparation method. Background Technology

[0002] The information disclosed in this background section is intended only to enhance understanding of the overall background of the invention and is not necessarily to be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art.

[0003] Ceramic matrix composites consist of one or more reinforcing materials, such as fibers, whiskers, carbon nanotubes, graphene, particles, and a second polymer or metallic phase. These composites typically exhibit excellent strength and wear resistance, good fracture toughness, high-temperature stability, and superior thermal shock resistance, as well as other functional properties.

[0004] The main preparation methods for ceramic matrix composites include chemical vapor infiltration (CVI), precursor impregnation and pyrolysis (PIP), liquid silica infiltration (LSI), and hot pressing sintering (HPS). The ceramic matrix composites obtained by these methods are mostly powder or bulk structures, which require further processing and molding to obtain parts with specific shapes, and it is difficult to directly obtain parts with complex structures. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention aims to provide a carbon fiber reinforced biomimetic nacre ceramic matrix composite material and its preparation method.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0007] In a first aspect, a method for preparing a carbon fiber reinforced biomimetic nacre ceramic matrix composite material includes the following steps:

[0008] S1. Draw a three-dimensional model of the nacreous biomimetic ceramic support and perform reduction photopolymerization 3D printing to obtain an Al2O3 green body. Separate the support structure from the Al2O3 green body. Then, clean the Al2O3 green body, remove uncured slurry, perform ultrasonic cleaning, curing and drying to obtain a fully treated Al2O3 green body.

[0009] S2. The fully treated Al2O3 green body is degreased and sintered to obtain a nacreous biomimetic ceramic support;

[0010] S3. Fill the nacre biomimetic ceramic scaffold with carbon fiber epoxy resin filler to obtain carbon fiber reinforced biomimetic nacre ceramic matrix composite material.

[0011] Preferably, in step S1, the slice layer thickness is 40-60μm, the laser power is 110-160mW, and the scanning spacing is 20-40μm during the reduction photopolymerization 3D printing.

[0012] Preferably, in step S1, the product is cleaned with anhydrous ethanol for 5-10 minutes, cured with ultraviolet light for 15-20 minutes, and dried at 60-80°C.

[0013] Preferably, in step S3, the carbon fiber epoxy resin filler is composed of epoxy resin, methyltetrachlorophthalic anhydride, curing accelerator and short-cut carbon fibers.

[0014] More preferably, the mass ratio of epoxy resin to methyltetrachlorophthalic anhydride is 100:20-30, the mass percentage of curing accelerator in carbon fiber epoxy resin filler is 0.05-0.15 wt%, and the mass percentage of short-cut carbon fiber in carbon fiber epoxy resin filler is 0.4-0.6 wt%.

[0015] More preferably, the preparation method of the carbon fiber epoxy resin filler includes the following steps:

[0016] A mixture of epoxy resin and methyltetrachlorophthalic anhydride is mixed with a curing accelerator, short-cut carbon fibers are added and stirred, and then degassed to obtain a carbon fiber epoxy resin filler.

[0017] In a further preferred embodiment, the mixture is stirred at a speed of 180-200 r / min for 15-20 minutes and then degassed under vacuum at 70-90°C.

[0018] Preferably, the specific steps of the filling process are as follows: the nacre biomimetic ceramic scaffold is completely immersed in carbon fiber epoxy resin filler for the first curing, the carbon fiber epoxy resin filler on the surface of the nacre biomimetic ceramic scaffold is cleaned, and then a second curing is performed and cooled.

[0019] Further preferred, the first curing temperature is 90-100℃, the pressure is -80kPa, and the time is 25-30min; the second curing temperature is 125-130℃, and the time is 2-3h.

[0020] In a second aspect, the present invention provides a carbon fiber reinforced biomimetic nacre ceramic matrix composite material, which is obtained by the preparation method described in the first aspect.

[0021] The beneficial effects achieved by one or more technical solutions of the present invention are as follows:

[0022] This invention selects suitable 3D printing processing parameters to solidify Al2O3 ceramic slurry into a mold. After debinding, sintering, and filling, a carbon fiber-reinforced biomimetic nacre ceramic matrix composite material is obtained. During the filling stage, when the nacre biomimetic ceramic scaffold is filled with carbon fiber-reinforced epoxy resin filler, crack deflection and inhibition can occur during the fracture process. Crack deflection and inhibition can effectively reduce the energy release rate at the crack tip, reduce the crack driving force, and increase energy dissipation during fracture, thereby increasing the toughness of the composite material.

[0023] This invention employs three steps—debinding, sintering, and filling—to obtain a nacreous biomimetic ceramic scaffold using reduction photopolymerization 3D printing technology. No second reinforcing phase particles are needed during the initial preparation of the printing material. The reduction photopolymerization 3D printing technology allows for the design of part shapes based on actual needs, resulting in more flexible and adaptable manufacturing processes. It enables the development of high-strength, high-toughness, and damage-resistant ceramic structures. Attached Figure Description

[0024] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0025] Figure 1 This is a schematic diagram of a three-dimensional model of the nacreous biomimetic ceramic scaffold of the present invention;

[0026] Figure 2 SEM images of the interface between the nacreous biomimetic ceramic scaffold and the filler, and distribution diagrams of C and Al elements;

[0027] Figure 3 SEM images of crack deflection and fiber pull-out at the fracture surface after carbon fiber is filled with epoxy resin filler.

[0028] Figure 4 The bending strength of the carbon fiber reinforced biomimetic nacre ceramic matrix composite material of Example 1 and the components prepared by Comparative Examples 1-3 is measured by a three-point bending test. In this example, RF is the epoxy resin-filled nacre biomimetic ceramic scaffold of Comparative Example 1, SC is the ceramic part of Comparative Example 2, UNF is the biomimetic nacre ceramic matrix composite material of Comparative Example 3, and CRF is the carbon fiber reinforced biomimetic nacre ceramic matrix composite material of Example 1. Detailed Implementation

[0029] To enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention will be described in detail below with reference to specific embodiments and comparative examples.

[0030] The equipment used in the embodiments and comparative examples of this invention is: (1) 3D printer (model: AME RP150); (2) UV curing chamber (model: PCU 80); (3) vacuum drying oven (model: DZF~6050); (4) 1700 degree box furnace (BR-17M); (5) double beam FIB scanning electron microscope (model: FIB~SEM GX4); (6) universal testing machine (model: WDW3200).

[0031] Example 1

[0032] The design and preparation method of a carbon fiber reinforced biomimetic nacre ceramic matrix composite material include the following steps:

[0033] First, draw a 3D model of the nacreous biomimetic ceramic scaffold (e.g.) Figure 1 As shown, the model was imported into a reduction photopolymerization 3D printer to print an Al2O3 green body with a nacreous biomimetic ceramic scaffold. Optimal process parameters (slice layer thickness of 40 μm, laser power of 120 mW, and scanning spacing of 20 μm) were selected to produce an Al2O3 green body without serious defects.

[0034] After printing, the support structure is separated from the Al2O3 green body. The green body is then cleaned with anhydrous ethanol for 5 minutes to remove residual resin. Uncured ceramic slurry is removed from the gaps in the green body using an air compressor. Next, the cleaned green body is ultrasonically cleaned for 30 minutes. Then, it is cured in a UV curing oven for 15 minutes to ensure complete curing. Finally, the green body is placed in a vacuum drying oven and dried at a constant temperature and pressure of 70°C for 3 hours.

[0035] Subsequently, the Al2O3 green body of the nacreous biomimetic ceramic support was degreased and sintered. After high-temperature sintering, the Al2O3 green body became a complete ceramic part.

[0036] Finally, the degreased and sintered nacre biomimetic ceramic scaffold was filled with carbon fiber epoxy resin filler. The carbon fiber epoxy resin filler was poured into a beaker until the ceramic scaffold was completely immersed in the filler. The beaker was then placed in a vacuum drying oven and cured for 30 minutes at 95°C and -80 kPa. The ceramic scaffold was removed, and excess resin was cleaned from the surface with an alcohol wipe. After cleaning, it was placed back into the vacuum drying oven and kept at a constant temperature of 125°C for 3 hours to allow it to fully cure. Finally, the filled ceramic scaffold was slowly cooled to room temperature, resulting in a high-strength, high-toughness, and damage-resistant carbon fiber reinforced biomimetic nacre ceramic matrix composite material.

[0037] The carbon fiber epoxy resin filler used in the filling method consists of: epoxy resin (E51 / 618), curing agent modified methyltetrachlorophthalic anhydride (MTHPA), curing accelerator (DMP-30), and short-cut carbon fibers.

[0038] The specific preparation steps are as follows: First, determine the ratio of epoxy resin to methyltetrachlorophthalic anhydride to be 100:25 by determining the ratio of epoxy value in epoxy resin to acid anhydride equivalent in curing agent; second, mix epoxy resin and MTHPA with 0.1 wt.% DMP-30, add 0.5 wt.% short-cut carbon fibers, and then stir at a constant speed of 300 r / min for 10 minutes; finally, place the mixture in a vacuum drying oven, heat it to 95℃, and perform vacuum degassing treatment to prepare the prepared carbon fiber epoxy resin filler.

[0039] like Figure 2 As shown, the microstructure at the interface between the filler and the ceramic was observed, and the distribution of Al and C elements was determined using an EDS system. It can be seen that the carbon fiber epoxy resin filler ceramic exhibits a tight bond without obvious gaps. Notably, the interface between the filler and the ceramic shows irregular boundary patterns, indicating that some C elements have penetrated into the Al elements, meaning the filler has a strong penetrating effect on the Al2O3 ceramic. This irregular interface and the strong penetration of the resin not only create a physical interlocking effect between the filler and the Al2O3 ceramic but also cause crack deflection and crack arrest. Crack deflection and crack arrest reduce the energy release rate at the crack tip and the deformation at the crack tip, increasing the energy required for crack propagation and thus improving the toughness of the material.

[0040] like Figure 3 As shown, the cross-section of carbon fiber reinforced biomimetic nacre ceramic matrix composite exhibits crack deflection, fiber "pull-out," and "debonding," both of which contribute to toughening. The crack deflection occurs because, after the addition of chopped carbon fibers, some fibers are arranged nearly parallel to the crack propagation direction. When the crack propagates downwards from the top, it deflects along the fiber bundle direction, increasing the energy required for fracture and thus producing a toughening effect. However, a stronger interfacial bond between the fiber and the composite material is not always better. Appropriate interfacial bond strength is a prerequisite for triggering the fiber "pull-out" and "debonding" toughening mechanisms in composite materials. It can be seen that the fiber and resin are well bonded. In particular, the damage to the pore edges caused by fiber pull-out is clearly visible. This indicates that the interface between the carbon fiber and the composite material bears a large load during crack propagation. Therefore, fiber pull-out hinders crack propagation during fracture, consuming a large amount of fracture energy and further improving the performance of the composite material.

[0041] Comparative Example 1

[0042] The difference between this comparative example and Example 1 is that short-cut carbon fibers are not used when preparing the carbon fiber epoxy resin filler.

[0043] Specifically, firstly, a three-dimensional model of the nacreous biomimetic ceramic scaffold is drawn (e.g., Figure 1 As shown, the model was imported into a reduction photopolymerization 3D printer to print an Al2O3 green body with a nacreous biomimetic ceramic scaffold. At this stage, preliminary experiments were conducted to adjust the 3D printer's process parameters. Optimal process parameters (40 μm slice thickness, 120 mW laser power, and 20 μm scanning spacing) were selected to produce Al2O3 green bodies without severe defects.

[0044] Next, after printing, the support structure is separated from the Al2O3 green body. The green body is then cleaned with anhydrous ethanol for 5 minutes to remove residual resin from its surface. Uncured ceramic slurry is removed from the gaps in the green body using an air compressor. The cleaned green body is then ultrasonically cleaned for 30 minutes. Next, the green body is cured in a UV curing oven for 15 minutes to ensure complete curing. Finally, the green body is placed in a vacuum drying oven and dried at a constant temperature and pressure of 70°C for 3 hours.

[0045] Subsequently, the Al2O3 green body of the nacreous biomimetic ceramic support was degreased and sintered. After high-temperature sintering, the Al2O3 green body became a complete ceramic part.

[0046] Finally, the degreased and sintered nacre biomimetic ceramic scaffold was filled with epoxy resin filler. The epoxy resin filler was poured into a beaker until the ceramic scaffold was completely immersed in the filler. The beaker was then placed in a vacuum drying oven and cured at 95℃ and -80kPa for 25-30 minutes. The ceramic scaffold was removed, and excess resin was cleaned from the surface with an alcohol wipe. After cleaning, it was placed back into the vacuum drying oven and kept at a constant temperature of 125-130℃ for 2-3 hours to allow it to fully cure. Finally, the filled ceramic scaffold was slowly cooled to room temperature to obtain the epoxy resin-filled nacre biomimetic ceramic scaffold, denoted as RF.

[0047] The epoxy resin filler used in the filling method consists of: epoxy resin (E51 / 618), curing agent modified methyltetrachlorophthalic anhydride (MTHPA), and curing accelerator (DMP~30).

[0048] The specific preparation steps are as follows: First, determine the ratio of epoxy resin to methyltetrachlorophthalic anhydride to be 100:25 by determining the ratio of epoxy value in epoxy resin to acid anhydride equivalent in curing agent; second, mix the epoxy resin and MTHPA mixture with 0.1 wt.% DMP-30, and then stir at a constant speed of 200 r / min for 10 minutes; finally, place the mixture in a vacuum drying oven, heat it to 95℃, and perform vacuum degassing treatment to prepare the prepared epoxy resin filler.

[0049] Comparative Example 2

[0050] The difference between this comparative example and Example 1 is that only an Al2O3 entity with the same length, width and height as the nacreous biomimetic ceramic scaffold is printed.

[0051] Specifically, a rectangular 3D model with dimensions identical to the nacreous biomimetic ceramic support was first imported into a reduction photopolymerization (VPP) 3D printer to generate an Al2O3 green body of the desired shape. During this stage, preliminary experiments were conducted to adjust the 3D printer's process parameters. Optimal process parameters (40μm slice thickness, 120mW laser power, and 20μm scanning spacing) were selected to produce an Al2O3 green body without significant defects.

[0052] Next, after printing, the support structure is separated from the Al2O3 green compact, and then the Al2O3 green compact is cleaned with anhydrous ethanol for 5 minutes to remove residual resin from its surface. Then, the Al2O3 green compact is cured in a UV curing oven for 15 minutes to fully cure it. Finally, the Al2O3 green compact is placed in a vacuum drying oven and dried at a constant temperature and pressure of 70°C for 3 hours.

[0053] Finally, the Al2O3 green body is degreased and sintered. After high-temperature sintering, the Al2O3 green body becomes a complete ceramic part, denoted as SC.

[0054] Comparative Example 3

[0055] The difference between this comparative example and Example 1 is that only the nacreous biomimetic ceramic scaffold is printed, without filling it.

[0056] Specifically, firstly, a three-dimensional model of the nacreous biomimetic ceramic scaffold is drawn (e.g., Figure 1 As shown, the model was imported into a reduction photopolymerization 3D printer to print an Al2O3 green body with a nacreous biomimetic ceramic scaffold. At this stage, preliminary experiments were conducted to adjust the 3D printer's process parameters. Optimal process parameters (40 μm slice thickness, 120 mW laser power, and 20 μm scanning spacing) were selected to produce Al2O3 green bodies without severe defects.

[0057] Next, after printing, the support structure is separated from the Al2O3 green body. The green body is then cleaned with anhydrous ethanol for 5 minutes to remove residual resin from its surface. Uncured ceramic slurry is removed from the gaps in the green body using an air compressor. The cleaned green body is then ultrasonically cleaned for 30 minutes. Next, the green body is cured in a UV curing oven for 15 minutes to ensure complete curing. Finally, the green body is placed in a vacuum drying oven and dried at a constant temperature and pressure of 70°C for 3 hours.

[0058] Finally, the Al2O3 green body of the nacreous biomimetic ceramic scaffold was degreased and sintered. After high-temperature sintering, the Al2O3 green body became the nacreous biomimetic ceramic scaffold, denoted as UNF.

[0059] Figure 4 The bending strength of different parts was shown in the three-point bending test. Compared with the unfilled nacre biomimetic ceramic scaffold, the bending strength of the carbon fiber reinforced biomimetic nacre ceramic matrix composite increased by 967.8% from 4.41 MPa to 47.09 MPa; compared with solid Al2O3, the bending strength increased by 293.4%.

[0060] Example 2

[0061] First, draw a 3D model of the nacreous biomimetic ceramic scaffold (e.g.) Figure 1 As shown, the model was imported into a reduction photopolymerization 3D printer to print an Al2O3 green body with a nacreous biomimetic ceramic scaffold. Optimal process parameters (slice layer thickness of 40 μm, laser power of 120 mW, and scanning spacing of 20 μm) were selected to produce an Al2O3 green body without serious defects.

[0062] After printing, the support structure is separated from the Al2O3 green body. The green body is then cleaned with anhydrous ethanol for 10 minutes to remove residual resin. Uncured ceramic slurry is removed from the gaps in the green body using an air compressor. Next, the cleaned green body is ultrasonically cleaned for 30 minutes. Then, it is cured in a UV curing oven for 15 minutes to ensure complete curing. Finally, the green body is placed in a vacuum drying oven and dried at a constant temperature and pressure of 80°C for 3 hours.

[0063] Subsequently, the Al2O3 green body of the nacreous biomimetic ceramic support was degreased and sintered. After high-temperature sintering, the Al2O3 green body became a complete ceramic part.

[0064] Finally, the degreased and sintered nacre biomimetic ceramic scaffold was filled with carbon fiber epoxy resin filler. The carbon fiber epoxy resin filler was poured into a beaker until the ceramic scaffold was completely immersed in the filler. The beaker was then placed in a vacuum drying oven and cured for 25 minutes at 95°C and -80 kPa. The ceramic scaffold was removed, and excess resin was cleaned from the surface with an alcohol wipe. After cleaning, it was placed back into the vacuum drying oven and kept at a constant temperature of 130°C for 2 hours to allow it to fully cure. Finally, the filled ceramic scaffold was slowly cooled to room temperature, resulting in a high-strength, high-toughness, and damage-resistant carbon fiber reinforced biomimetic nacre ceramic matrix composite material.

[0065] The carbon fiber epoxy resin filler used in the filling method consists of: epoxy resin (E51 / 618), curing agent modified methyltetrachlorophthalic anhydride (MTHPA), curing accelerator (DMP-30), and short-cut carbon fibers.

[0066] The specific preparation steps are as follows: First, determine the ratio of epoxy resin to methyltetrachlorophthalic anhydride to be 100:20 by determining the ratio of epoxy value in epoxy resin to acid anhydride equivalent in curing agent; second, mix epoxy resin and MTHPA with 0.1 wt.% DMP-30, add 0.4 wt.% short-cut carbon fibers, and then stir at a constant speed of 300 r / min for 10 minutes; finally, place the mixture in a vacuum drying oven, heat it to 95℃, and perform vacuum degassing treatment to prepare the prepared carbon fiber epoxy resin filler.

[0067] Example 3

[0068] First, draw a 3D model of the nacreous biomimetic ceramic scaffold (e.g.) Figure 1 As shown, the model was imported into a reduction photopolymerization 3D printer to print an Al2O3 green body with a nacreous biomimetic ceramic scaffold. Optimal process parameters (slice layer thickness of 40 μm, laser power of 120 mW, and scanning spacing of 20 μm) were selected to produce an Al2O3 green body without serious defects.

[0069] After printing, the support structure is separated from the Al2O3 green body. The green body is then cleaned with anhydrous ethanol for 5 minutes to remove residual resin. Uncured ceramic slurry is removed from the gaps in the green body using an air compressor. Next, the cleaned green body is ultrasonically cleaned for 20 minutes. Then, it is cured in a UV curing oven for 15 minutes to ensure complete curing. Finally, the green body is placed in a vacuum drying oven and dried at a constant temperature and pressure of 80°C for 3 hours.

[0070] Subsequently, the Al2O3 green body of the nacreous biomimetic ceramic support was degreased and sintered. After high-temperature sintering, the Al2O3 green body became a complete ceramic part.

[0071] Finally, the degreased and sintered nacre biomimetic ceramic scaffold was filled with carbon fiber epoxy resin filler. The carbon fiber epoxy resin filler was poured into a beaker until the ceramic scaffold was completely immersed in the filler. The beaker was then placed in a vacuum drying oven and cured for 25 minutes at 95°C and -80 kPa. The ceramic scaffold was removed, and excess resin was cleaned from the surface with an alcohol wipe. After cleaning, it was placed back into the vacuum drying oven and kept at a constant temperature of 130°C for 2 hours to allow it to fully cure. Finally, the filled ceramic scaffold was slowly cooled to room temperature, resulting in a high-strength, high-toughness, and damage-resistant carbon fiber reinforced biomimetic nacre ceramic matrix composite material.

[0072] The carbon fiber epoxy resin filler used in the filling method consists of: epoxy resin (E51 / 618), curing agent modified methyltetrachlorophthalic anhydride (MTHPA), curing accelerator (DMP-30), and short-cut carbon fibers.

[0073] The specific preparation steps are as follows: First, determine the ratio of epoxy resin to methyltetrachlorophthalic anhydride to be 100:30 by determining the ratio of epoxy value in epoxy resin to acid anhydride equivalent in curing agent; second, mix epoxy resin and MTHPA with 0.1 wt.% DMP-30, add 0.6 wt.% short-cut carbon fibers, and then stir at a constant speed of 300 r / min for 10 minutes; finally, place the mixture in a vacuum drying oven, heat it to 95℃, and perform vacuum degassing treatment to prepare the prepared carbon fiber epoxy resin filler.

[0074] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for preparing a carbon fiber reinforced biomimetic nacre ceramic matrix composite material, characterized in that, Includes the following steps: S1. Draw a three-dimensional model of the nacreous biomimetic ceramic support and perform reduction photopolymerization 3D printing to obtain an Al2O3 green body. Separate the support structure from the Al2O3 green body. Then, clean the Al2O3 green body, remove uncured slurry, perform ultrasonic cleaning, curing and drying to obtain a fully treated Al2O3 green body. S2. The fully treated Al2O3 green body is degreased and sintered to obtain a nacreous biomimetic ceramic support; S3. Fill the nacre biomimetic ceramic scaffold with carbon fiber epoxy resin filler to obtain carbon fiber reinforced biomimetic nacre ceramic matrix composite material. The structure of the nacreous biomimetic ceramic scaffold is 35mm long, 14mm wide, and 6mm high; the protruding part is hexagonal; the diameter of the hexagon is 8mm and the thickness is 1.2mm; the distance between each hexagon is 2mm. In step S3, the carbon fiber epoxy resin filler is composed of epoxy resin, methyltetrachlorophthalic anhydride, curing accelerator and short carbon fibers; The preparation method of the carbon fiber epoxy resin filler includes the following steps: A mixture of epoxy resin and methyltetrachlorophthalic anhydride is mixed with a curing accelerator, short-cut carbon fibers are added and stirred, and then degassed to obtain a carbon fiber epoxy resin filler.

2. The preparation method according to claim 1, characterized in that, In step S1, the thickness of the slice layer during reduction photopolymerization 3D printing is 40-60 μm, the laser power is 110-160 mW, and the scanning spacing is 20-40 μm.

3. The preparation method according to claim 1, characterized in that, In step S1, clean with anhydrous ethanol for 5-10 min, cure with ultraviolet light for 15-20 min, and dry at 60-80 ℃.

4. The preparation method according to claim 1, characterized in that, The mass ratio of epoxy resin to methyltetrachlorophthalic anhydride is 100:20-30, the mass percentage of curing accelerator in carbon fiber epoxy resin filler is 0.05-0.15 wt%, and the mass percentage of short carbon fiber in carbon fiber epoxy resin filler is 0.4-0.6 wt%.

5. The preparation method according to claim 1, characterized in that, Stir at 180-200 r / min for 15-20 minutes, and then degas under vacuum at 70-90 ℃.

6. The preparation method according to claim 1, characterized in that, The specific steps of the filling process are as follows: the nacre biomimetic ceramic scaffold is completely immersed in carbon fiber epoxy resin filler for the first curing, the carbon fiber epoxy resin filler on the surface of the nacre biomimetic ceramic scaffold is cleaned, and then a second curing is performed and cooled.

7. The preparation method according to claim 6, characterized in that, The first curing temperature is 90-100 ℃, the pressure is -80kPa, and the time is 25-30 min; the second curing temperature is 125-130 ℃, and the time is 2-3 h.

8. A carbon fiber reinforced biomimetic nacre ceramic matrix composite material, characterized in that, Obtained by the preparation method as described in any one of claims 1-7.

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