A biomimetic laminated ceramic-metal composite material and a preparation method thereof

Abstract

The application discloses a kind of bionic laminated ceramic-metal composite material and preparation method thereof, belong to material synthesis and processing technical field.Bionic laminated ceramic-metal composite material includes upper layer and lower layer of ceramic material, and intermediate layer of metal material, the intermediate layer is arch structure, the composite material is impregnated using epoxy resin impregnating agent;Ceramic material and metal material fixed connection.Preparation method includes: drawing three-dimensional model of ceramic layer structure and metal layer structure respectively;Print the three-dimensional model drawn using reduction photopolymerization and laser powder bed fusion 3D printer, obtain the shape of alumina green body and 316L stainless steel parts;Al2O3 green body is debound and sintered, and obtain the dense ceramic layer structure entity;Material is sequentially combined, and it is impregnated using epoxy resin impregnating agent.The application develops ceramic structure of high strength, high toughness and damage resistance.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of material synthesis and processing, and particularly relates to a kind of bionic layered ceramic-metal composite material and its preparation method. BACKGROUND

[0002] The statements in this section merely provide background information related to the present application and do not necessarily constitute prior art.

[0003] Oniscid snails are special organisms living in deep-sea hydrothermal vents, with strong resistance to high temperature, high pressure and strong acid, and also showing strong resistance to predatory enemies. The formation of its excellent performance is closely related to the special combination of materials, microstructure and high strength and toughness of the layered shell structure.

[0004] Ceramics and metals are the two most common materials in engineering applications. Due to the strong covalent (or ionic) bond, ceramic materials have high melting point, high modulus, high hardness and high thermal stability. However, due to the limitation of atomic mobility and dislocation activation ability, the fracture toughness of ceramic materials is low, the damping performance is poor, and the defect sensitivity is high. On the contrary, the toughness, fracture toughness and damping performance of metals are relatively high, mainly because their metal bonds are more elastic.

[0005] In order to combine the bionic structure to make up for the deficiency of ceramic by means of the excellent toughness of metal, there is an urgent need to study a new preparation method of high damage-resistant bionic layered ceramic-metal composite material, so as to have more excellent performance of the ceramic matrix composite material and expand its application range. SUMMARY

[0006] In view of the deficiencies of the prior art, the present application provides a kind of bionic layered ceramic-metal composite material and its preparation method, which breaks through the research status of traditional preparation of ceramic matrix composite material to improve the strength and toughness of ceramic material. The high damage-resistant ceramic-metal composite material is obtained by the ordered combination of alumina ceramic and 316L stainless steel and the special structure of tortoise bite joint. In order to achieve the above purpose, the present application is realized by the following technical scheme:

[0007] As a first aspect of the present application, a kind of bionic layered ceramic-metal composite material is provided, including the upper layer and the lower layer of ceramic material, and the intermediate layer of metal material, the intermediate layer is arched structure, the composite material is impregnated with epoxy resin impregnant;Ceramic material and metal material are fixedly connected.

[0008] Preferably, the arched structure of the intermediate layer is composed of repeated continuous arches.

[0009] Further, the arched structure adopts the structure of turtle bite joint.

[0010] The ceramic material adopts alumina ceramic, and the metal material adopts 316L stainless steel.

[0011] The bionic layered ceramic-metal composite material provided by the application simulates the layered structure of the snail shell of Acusta despectus, and according to the layered feature that the middle layer of the snail shell of Acusta despectus is soft and ductile and the upper and lower layers are hard and rigid, alumina ceramic is used as the upper and lower layers, 316L stainless steel is used as the middle layer, the materials are orderly combined, TPU rubber rings are used to fix the three parts, and then an epoxy resin impregnating agent is used to impregnate the three parts.

[0012] Because the structure designed according to the occlusal joint structure of the turtle shell is relatively complex and is difficult to be prepared by using a conventional method, photopolymerization printing and laser powder bed fusion printing are selected to prepare the ceramic and metal parts respectively.

[0013] As a second aspect of the application, the application provides a bionic layered ceramic-metal composite material and a preparation method thereof, which comprises the following steps:

[0014] Step 1, using a three-dimensional modeling software to draw three-dimensional models of ceramic layer structures and metal layer structures respectively;

[0015] Step 2, using a reduced photopolymerization and laser powder bed fusion 3D printer to print the drawn three-dimensional models to obtain alumina green bodies and 316L stainless steel parts with required shapes;

[0016] Step 3, debinding and sintering the alumina green bodies to obtain dense ceramic layer structure entities;

[0017] Step 4, using alumina ceramic as the upper and lower layers and 316L stainless steel as the middle layer to orderly combine the materials, fixing the three parts and then using an epoxy resin impregnating agent to impregnate the three parts.

[0018] As a third aspect of the application, the application provides a high damage-resistant ceramic composite material prepared by the bionic layered ceramic-metal composite material and the preparation method thereof.

[0019] Compared with the prior art, the application has the following beneficial effects:

[0020] (1) The application adopts two steps of 3D printing and impregnation, successfully combines the occlusal joint structure of the turtle shell and the layered structure of the snail shell of Acusta despectus by using two additive manufacturing processes of reduced photopolymerization-laser powder bed fusion, the upper and lower layers of the structure are alumina ceramic, the middle layer is 316L stainless steel, the structure of the middle layer is designed according to the occlusal joint of the turtle shell, and the overall layered feature is designed according to the structure of the snail shell of Acusta despectus, and the application realizes the orderly combination of different materials.

[0021] (2) The two 3D printing technologies used in this invention, reduction photopolymerization and laser powder bed melting, can be designed according to actual needs, making the manufacturing of parts more flexible and adaptable.

[0022] (3) This invention selects suitable 3D printing processing parameters to print biomimetic ceramic layer structures and metal layer structures, which are then impregnated to obtain biomimetic layered ceramic-metal composite materials. Due to the high strength and toughness of 316L stainless steel, the composite material can withstand high loads. In addition, when a crack reaches the 316L stainless steel layer, crack deflection and hindrance will occur inside the composite material. Crack deflection and hindrance can effectively reduce the energy release rate at the crack tip, reduce the crack driving force, and increase the energy dissipation during the fracture process, thereby increasing the toughness of the composite material.

[0023] (4) The biomimetic layered ceramic-metal composite material and its preparation method of the present invention can develop ceramic structures with high strength, high toughness and damage resistance. 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 the three-dimensional model structure of the biomimetic layered ceramic-metal composite material designed in this invention.

[0026] Figure 2 SEM images of the interface between 316L stainless steel and the impregnating agent, and distribution diagrams of Fe and C elements.

[0027] Figure 3 SEM images of the interface between Al2O3 and the impregnating agent, and distribution maps of Al and C elements.

[0028] Figure 4 These are the results of the flexural strength and fracture toughness of the products prepared in the examples and comparative examples.

[0029] The diagram exaggerates the spacing or dimensions between parts to show their positions; the diagram is for illustrative purposes only.

[0030] Wherein: 1-Ceramic layer, 2-Metal layer. Detailed Implementation

[0031] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0032] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, components, and / or groups thereof, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0033] For the convenience of description, if the terms "upper", "lower", "left", "right" are used in the present application, they only mean the same direction as the upper, lower, left and right directions of the drawings themselves, and do not limit the structure, but only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application.

[0034] Term explanation part: The terms "mounting", "connecting", "connecting", "fixing" and the like in the present application should be understood broadly, for example, it can be fixed connection, or detachable connection, or one body; it can be mechanical connection, or electrical connection, it can be direct connection, or indirect connection through intermediate medium, it can be internal connection of two elements, or interaction relationship between two elements, for those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0035] A kind of bionic layered ceramic-metal composite material and its preparation method, comprising the following steps:

[0036] Step 1, use CAD software to draw three-dimensional model of ceramic layer structure and metal layer structure respectively;

[0037] Step 2, print the three-dimensional model drawn using reduced photopolymerization and laser powder bed fusion 3D printer, to obtain Al2O3 green body and 316L stainless steel parts of the required shape;

[0038] After Al2O3 ceramic printing is completed, first, separate the support structure from the Al2O3 green body. Subsequently, clean the Al2O3 green body with anhydrous ethanol to remove excess resin on its surface. Then, clean the Al2O3 green body gap with an air compressor to remove the un-solidified ceramic slurry. Then, place the cleaned Al2O3 green body into an ultrasonic cleaning instrument for ultrasonic cleaning. Finally, place the Al2O3 green body into a UV curing box, and allow the unformed part to solidify for a period of time;

[0039] After 316L stainless steel printing is completed, separate the part from the metal substrate using wire cutting technology. Subsequently, use a sandblasting machine to process the surface of the part to remove possible burrs and unadhered powder;

[0040] Step 3, debinding and sintering the Al2O3 green body to obtain a dense ceramic layer structure entity;

[0041] Step 4, according to the layered characteristics that the middle layer of the snail shell is a soft and tough material and the upper and lower layers are hard and rigid materials, the material is orderly combined by using alumina ceramic as the upper and lower layers and 316L stainless steel as the middle layer, and then the three parts are fixed by using a TPU rubber ring and impregnated by using an epoxy resin impregnating agent.

[0042] The three-dimensional model structure of the bionic layered ceramic-metal composite material prepared in the application is shown in Figure 1 The upper layer and the lower layer are alumina ceramic layers 1, the middle layer is a metal layer 2 of 316L stainless steel, and the structure of the middle layer is designed according to the occlusal joint of a turtle shell, which is composed of repeated continuous arches; the overall layered characteristics are designed according to the layered structure that the middle layer of the snail shell is a soft and tough material and the upper and lower layers are hard and rigid materials.

[0043] As a typical example, the bionic layered ceramic-metal composite material is about 30 mm long, about 6 mm wide, and about 6 mm high, wherein the thickness of the metal layer is about 0.5 mm. The metal layer comprises ten transverse arch structures and two longitudinal arch structures.

[0044] Thermogravimetric differential scanning calorimetry (TG-DSC) test is also performed to measure the TG curve, DSC curve and derivative thermogravimetric (DTG) curve to provide guidance in the debinding and sintering process of the alumina blank.

[0045] In one or more embodiments, the Al2O3 green body is cleaned with anhydrous ethanol for 5-10 minutes.

[0046] In one or more embodiments, the Al2O3 green body is cured in a UV curing box for 5-10 minutes.

[0047] In one or more embodiments, the Al2O3 green body is placed in a vacuum drying oven and dried at a constant temperature of 60-80°C under normal pressure for 2-3 hours.

[0048] In one or more embodiments, the 316L stainless steel structure is cleaned using a sandblasting machine for 5-10 minutes.

[0049] In one or more embodiments, the reduction photopolymerization 3D printing processing parameters are as follows: the slice layer thickness is 50-60 μm, the laser power is 110-150 mW, and the scanning interval is 30-40 μm.

[0050] In one or more embodiments, the laser powder bed fusion 3D printing process parameters are: the slice layer thickness is 20-30 μm, the laser power is 180-220 W, and the scanning interval is 70-80 μm.

[0051] In one or more embodiments, when the Al2O3 green body of the model entity is subjected to debinding and sintering treatment, the specific operation steps are:

[0052] First, the Al2O3 green body is placed in a crucible and then sent to a box furnace for debinding treatment. After debinding, it is sent back to the box furnace for high-temperature sintering, and finally an Al2O3 entity model of the desired shape is obtained.

[0053] Further, the method for preparing the epoxy resin impregnant is:

[0054] First, the ratio of epoxy resin to modified methyl tetrahydrophthalic anhydride is determined by determining the ratio of the epoxy value in the epoxy resin to the anhydride equivalent in the curing agent; second, the mixture of epoxy resin and modified methyl tetrahydrophthalic anhydride is mixed with a curing accelerator, and then stirred at a certain speed for a period of time; finally, the mixture is placed in a vacuum drying oven, heated to a specific temperature, and vacuum degassed to prepare the prepared epoxy resin impregnant.

[0055] In one or more embodiments, the stirring speed is 180-200 r / min for 10-15 minutes; finally, the mixture is vacuum degassed in a vacuum drying oven at 70-95℃ to obtain the prepared epoxy resin impregnant.

[0056] Further, the specific steps of the impregnation method are:

[0057] The epoxy resin impregnant is poured into a beaker until the impregnant completely immerses the ceramic layer and 316L layer structure. Then the beaker is placed in a vacuum drying oven and cured at 95℃ and -80 kPa for 25-26 minutes. The ceramic layer and 316L layer structure are taken out and the excess resin on the surface is cleaned with an alcohol wipe. After cleaning, it is again placed in a vacuum drying oven and kept at a constant temperature of 125-130℃ for 2-3 hours to completely cure. Finally, the impregnated ceramic layer and 316L layer structure are slowly cooled to room temperature.

[0058] Example One

[0059] Firstly, the three-dimensional model of the ceramic layer structure and the metal layer structure was drawn, and the model was imported into the vat photopolymerization and laser powder bed fusion 3D printers, respectively, to print the ceramic layer and metal layer structure. At this stage, preliminary experiments were conducted to adjust the process parameters of the 3D printer. The best vat photopolymerization 3D printing process parameters (slice layer thickness of 50 μm, laser power of 110 mW, and scanning interval of 30 μm) and the best laser powder bed fusion 3D printing process parameters (slice layer thickness of 30 μm, laser power of 200 W, and scanning interval of 70 μm) were selected to manufacture parts without serious defects.

[0060] Secondly, after the printing was completed, the support structure was separated from the Al2O3 green body, and then the Al2O3 green body was cleaned with anhydrous ethanol for 3 minutes to remove the resin remaining on its surface. The unsolidified ceramic slurry in the gaps of the Al2O3 green body was cleaned using an air compressor, and then the cleaned Al2O3 green body was placed in an ultrasonic cleaner for ultrasonic cleaning for 30 minutes. Finally, the Al2O3 green body was placed in a vacuum drying oven and dried at 70°C for 3 hours under constant temperature and normal pressure.

[0061] Then, the 316L stainless steel structure was cleaned using a sandblasting machine for 5 minutes to remove burrs and unattached powder on the surface.

[0062] After that, the Al2O3 green body of the ceramic layer structure was subjected to debinding and sintering treatment, and after high-temperature sintering, the Al2O3 green body became a complete ceramic part.

[0063] Finally, the materials were orderly combined using alumina ceramic as the upper and lower layers and 316L stainless steel as the middle layer, and then fixed using a TPU rubber ring and impregnated with an epoxy resin impregnating agent, thereby obtaining a high-strength, high-toughness, and damage-resistant biomimetic layered ceramic-metal composite material.

[0064] The composition of the epoxy resin impregnating agent used in the impregnation method is: epoxy resin (E51 / 618), curing agent modified methyl tetrahydrophthalic anhydride (MTHPA), and curing accelerator (DMP-30).

[0065] The specific preparation steps are as follows: first, the ratio of epoxy resin to MTHPA is determined by determining the ratio of the epoxy value in the epoxy resin to the anhydride equivalent in the curing agent, which is 4:3; second, the mixture of epoxy resin and MTHPA is mixed with 0.1 wt.% of DMP-30, and then stirred at a constant speed of 300 r / min for 10 minutes; finally, the mixture is placed in a vacuum drying oven and heated to 95°C for vacuum degassing treatment, thereby preparing the prepared epoxy resin impregnating agent.

[0066] As Figure 2As shown, the microstructure of the interface between the infiltrant and 316L stainless steel was observed and the distribution of C element and Fe element was determined by EDS system. It can be seen that the interface between the epoxy resin infiltrant and 316L stainless steel is smooth without obvious gap, and full infiltration between the two materials is achieved.

[0067] As shown, the microstructure of the interface between the infiltrant and 316L stainless steel was observed and the distribution of C element and Fe element was determined by EDS system. It can be seen that the interface between the epoxy resin infiltrant and 316L stainless steel is smooth without obvious gap, and full infiltration between the two materials is achieved. Figure 3 As shown, the microstructure of the interface between the infiltrant and 316L stainless steel was observed and the distribution of C element and Fe element was determined by EDS system. It can be seen that the interface between the epoxy resin infiltrant and 316L stainless steel is smooth without obvious gap, and full infiltration between the two materials is achieved.

[0068] Comparative Example 1

[0069] The difference between this comparative example and Example 1 is that when modeling the 316L stainless steel layer, the Y direction is not scanned, and it is a 2D structure.

[0070] Specifically, three-dimensional models of the ceramic layer structure and the metal layer structure were drawn, and the models were respectively introduced into the vat photopolymerization and laser powder bed fusion 3D printers to print the ceramic layer and the metal layer structure. At this stage, preliminary experiments were conducted to adjust the process parameters of the 3D printer. The best vat photopolymerization 3D printing process parameters (slice layer thickness of 50 μm, laser power of 110 mW, and scanning interval of 30 μm) and the best laser powder bed fusion 3D printing process parameters (slice layer thickness of 30 μm, laser power of 200 W, and scanning interval of 70 μm) were selected in order to manufacture parts without serious defects.

[0071] Secondly, after the printing is completed, the support structure is separated from the Al2O3 green body, and then the Al2O3 green body is cleaned with anhydrous ethanol for 3 minutes to remove the residual resin on its surface. The air compressor is used to clean the unsolidified ceramic slurry in the gap of the Al2O3 green body, and then the cleaned Al2O3 green body is placed in an ultrasonic cleaning instrument for ultrasonic cleaning for 30 minutes. Finally, the Al2O3 green body is placed in a vacuum drying oven and dried at 70°C under constant temperature and normal pressure for 3 hours.

[0072] Then, the sandblasting machine is used to clean the 316L stainless steel structure for 5 minutes to remove the burrs and unattached powder on the surface.

[0073] After that, the Al2O3 green body of the ceramic layer structure is subjected to debinding and sintering treatment, and the Al2O3 green body becomes a complete ceramic part after high-temperature sintering.

[0074] Finally, the ceramic layer structure and the metal layer structure are subjected to impregnation treatment using an epoxy resin impregnating agent in a certain arrangement order, so as to obtain a 2D layered ceramic-metal composite material.

[0075] The composition of the epoxy resin impregnating agent used in the impregnation method is: epoxy resin (E51 / 618), curing agent modified methyl tetrahydrophthalic anhydride (MTHPA), and curing accelerator (DMP-30).

[0076] The specific preparation steps are as follows: first, the ratio of epoxy resin to MTHPA is determined by determining the ratio of the epoxy value in the epoxy resin to the anhydride equivalent in the curing agent, which is 4:3; second, the mixture of epoxy resin and MTHPA is mixed with 0.1 wt.% of DMP-30, and then stirred at a constant speed of 300 r / min for 10 minutes; finally, the mixture is placed in a vacuum drying box, and the temperature is raised to 95°C for vacuum degassing treatment, so as to prepare the prepared epoxy resin impregnating agent.

[0077] Comparative Example 2

[0078] The difference between this comparative example and Example 1 is that only an Al2O3 solid body with the same length, width, and height as the biomimetic layered ceramic-metal composite material is printed out;

[0079] Specifically, first, a cuboid three-dimensional model with the same size as the biomimetic layered ceramic-metal composite material is imported into the reduced photopolymerization 3D printer to generate an Al2O3 green body with the required shape. At this stage, preliminary experiments are conducted to adjust the process parameters of the 3D printer. The best process parameters (slice layer thickness of 50 μm, laser power of 110 mW, and scanning interval of 30 μm) are selected to manufacture an Al2O3 green body without serious defects.

[0080] Secondly, after the printing is completed, the support structure is separated from the Al2O3 green body, and then the Al2O3 green body is washed with anhydrous ethanol for 5 minutes to remove the residual resin on its surface. Then, the Al2O3 green body is cured in a UV curing box for 15 minutes to fully cure the Al2O3 green body. Then, the Al2O3 green body is placed in a vacuum drying box and dried at 70°C under constant temperature and normal pressure for 3 hours.

[0081] Finally, the Al2O3 green body is subjected to debinding and sintering treatment, and the Al2O3 green body becomes a complete ceramic part after high-temperature sintering.

[0082] Figure 4The bending strength and fracture toughness results of the biomimetic layered ceramic-metal composite material and the preparation method thereof according to one or more embodiments of the present application after three-point bending test and single-edge notched beam bending test show the bending strength and fracture toughness of different parts. Compared with Comparative Example 1, the bending strength of the biomimetic layered ceramic-metal composite material increases by 23.63% from 178.10 MPa to 220.18 MPa, and the fracture toughness increases by 40.29% from 15.66 MPa·m 1 / 2 to 21.97 MPa·m 1 / 2 Compared with Comparative Example 2, the bending strength increases by 1038.47%, and the fracture toughness increases by 1897.27%.

[0083] The equipment selected in the above examples and comparative examples is as follows:

[0084] (1) Reductive photopolymerization 3D printer (model: AME RP150);

[0085] (2) Laser powder bed fusion 3D printer (model: FS121 M);

[0086] (3) Ultraviolet curing box (model: PCU 80);

[0087] (4) Vacuum drying oven (model: DZF-6050);

[0088] (5) 1700-degree box furnace (BR-17M);

[0089] (6) Dual-beam FIB scanning electron microscope (model: FIB-SEM GX4);

[0090] (7) Universal testing machine (model: WDW3200).

[0091] In the above examples and comparative examples, the reductive photopolymerization 3D printing technology and the laser powder bed fusion 3D printing technology used are common 3D printing methods, wherein the reductive photopolymerization 3D printing device can adopt the structure as described in the published patent "Ceramic and preparation method thereof by internal, external reinforcement and toughening" (publication number: CN202211077803.8), including a platform, a ceramic raw material cylinder, a ceramic forming cylinder, a slurry scraper, a ceramic laser, and a scraper holder. Through 3D printing laser sintering technology, which is a technology commonly known to those skilled in the art. The laser powder bed fusion 3D printing can adopt the published patent "3D printer with cooling powder laying device and printing method thereof" (publication number: CN110539485A) or other devices that can achieve the same effect.

[0092] The above merely provides the preferred embodiments of the present application, and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the principles and technical scope of the present application shall fall into the scope of the present application.

Claims

1. A biomimetic layered ceramic-metal composite material, characterized by, The ceramic material layer includes an upper layer and a lower layer, and the metal material layer includes an intermediate layer, the intermediate layer is an arch structure, and the composite material is impregnated with an epoxy resin impregnant; the ceramic material and the metal material are fixedly connected; The arch structure adopts a turtle shell occlusion joint structure.

2. The biomimetic layered ceramic-metal composite of claim 1, wherein The ceramic material is alumina ceramic, and the metal material is 316L stainless steel.

3. A method for producing the biomimetic layered ceramic-metal composite material according to claim 2, characterized in that, The method comprises the following steps: Step 1, using three-dimensional modeling software to draw three-dimensional models of the ceramic material layer structure and the metal material layer structure respectively; Step 2, using a reduced light polymerization and laser powder bed fusion 3D printer to print the drawn three-dimensional models to obtain alumina green bodies and 316L stainless steel parts of a required shape; Step 3, debinding and sintering the alumina green body to obtain a dense ceramic layer structure entity; Step 4, using the alumina ceramic material layer as the upper and lower layers and the 316L stainless steel part as the intermediate layer to orderly combine the materials, and then impregnating the three parts with an epoxy resin impregnant.

4. The method for producing a biomimetic layered ceramic-metal composite material according to claim 3, characterized by, In step 2, after the alumina green body is printed, the support structure is first separated from the alumina green body; then, the alumina green body is cleaned with anhydrous ethanol to remove excess resin on the surface of the alumina green body; then, the alumina green body is cleaned with an air compressor to remove the un-solidified ceramic slurry in the gaps of the alumina green body; then, the cleaned alumina green body is placed in an ultrasonic cleaning instrument for ultrasonic cleaning; finally, the alumina green body is placed in a ultraviolet curing box to solidify the un-formed part after a period of time.

5. The method for producing a biomimetic layered ceramic-metal composite according to claim 4, characterized in that, In step 2, the alumina green body is cleaned with anhydrous ethanol for 5-10 minutes; The alumina green body is cured in the ultraviolet curing box for 5-10 minutes.

6. The method of claim 5, wherein the ceramic-metal composite is a layered ceramic-metal composite. In step 2, finally, the alumina green body is placed in a vacuum drying oven and dried at a constant temperature of 60-80°C under normal pressure for 2-3 hours.

7. The method of claim 5, wherein the ceramic-metal composite is a layered ceramic-metal composite. In step 2, after the 316L stainless steel part is printed, the part is separated from the metal substrate by using a wire cutting technology; then, the surface of the part is treated by using a sandblasting machine to remove burrs and un-adhered powder that may exist; The 316L stainless steel part is cleaned by using the sandblasting machine for 5-10 minutes.

8. The method for preparing the bionic layered ceramic-metal composite material according to claim 5, wherein In step 2, the reduced light polymerization 3D printing processing parameters are as follows: the slice layer thickness is 50-60 μm, the laser power is 110-150 mW, and the scanning interval is 30-40 μm; In step 2, the laser powder bed fusion 3D printing processing parameters are as follows: the slice layer thickness is 20-30 μm, the laser power is 180-220 W, and the scanning interval is 70-80 μm.

9. The method for preparing the bionic layered ceramic-metal composite material according to claim 5, wherein In step 3, a thermogravimetric differential scanning calorimetry test is performed to obtain a TG curve, a DSC curve and a derivative thermogravimetric curve to provide guidance in the debinding and sintering process of the alumina blank.

10. The method for preparing the bionic layered ceramic-metal composite material according to claim 5, wherein In step 4, the method for preparing the epoxy resin impregnant is as follows: Firstly, the ratio of epoxy resin and modified methyl tetrahydrophthalic anhydride is determined by determining the ratio of epoxy value in epoxy resin and anhydride equivalent in curing agent; secondly, the mixture of epoxy resin and modified methyl tetrahydrophthalic anhydride is mixed with curing accelerator, and then stirred at a certain speed for a period of time; finally, the mixture is placed in a vacuum drying oven, heated to a specific temperature, and vacuum degassing treatment is carried out, so that the prepared epoxy resin impregnant is prepared; In step 4, the stirring speed is 180-200 r / min, and the stirring time is 10-15 minutes; finally, the mixture is vacuum degassed in a vacuum drying oven at 70-95℃, and the prepared epoxy resin impregnant is obtained. The specific steps of impregnation are as follows: Pour the epoxy resin impregnant into a beaker until the impregnant completely immerses the ceramic layer and 316L stainless steel layer structure; then put the beaker into a vacuum drying oven and cure at 95℃ and-80kPa for 25-26 minutes; take out the ceramic layer and 316L stainless steel layer structure, clean the surface of the excess resin with an alcohol wipe, and then put it into the vacuum drying oven again under the condition of constant temperature at 125-130℃ for 2-3 hours to make it completely cured; finally, slowly cool the impregnated ceramic layer and 316L stainless steel layer structure to room temperature.

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