Preparation method of porous ceramic reinforced metal composite armor with gradient porosity

Abstract

The present invention belongs to the technical field related to the preparation of metal ceramic composite armor, and discloses a method for preparing porous ceramic reinforced metal composite armor with gradient porosity, including: parametric design of three-period minimal surface continuous gradient porous ceramic core plate; preparing the corresponding ceramic core plate by additive manufacturing and reaction sintering; infiltrating the metal substrate melt to fill the internal pores of the ceramic core plate; and further densifying the ceramic and metal and strengthening the composite interface strength through hot isostatic pressing process. The present invention also discloses a corresponding porous ceramic reinforced metal composite armor with gradient porosity. Through the present invention, not only can the stress distribution be uniform when under pressure, which can effectively improve the bulletproof performance of the armor, especially the ability to resist multiple bullets, but also the ceramic core plate can be improved in terms of absorbing impact energy, and at the same time has the advantages of simple preparation, easy control, and good comprehensive performance.

Description

Technical Field

[0001] The present invention belongs to the technical field related to the preparation of metal-ceramic composite armor, and more specifically, relates to a method for preparing porous ceramic-reinforced metal composite armor with gradient porosity. Background Art

[0002] With the continuous development of science and technology, the power of anti-armor weapons is increasing, which places higher and higher requirements on armor protection. At the same time, the combat mobility and rapid response capability of weapon systems are also an important indicator of combat capability in modern warfare. This requires new armor to not only have efficient bulletproof capabilities, but also be lightweight. Ceramic materials have outstanding characteristics such as high strength, high hardness, low density, corrosion resistance, and high wear resistance. They can meet the requirements of efficient bulletproof capabilities and lightness at the same time, so they are widely used in the field of armor protection. However, the inherent brittleness of single ceramic materials has always been an important reason restricting their application in the field of armor protection. The introduction of ceramic metal composite armor can effectively solve this problem. Ceramic metal composite armor has both high strength, high stiffness and high toughness. In recent years, it has become a research hotspot in the field of armor protection.

[0003] In the prior art, the common metal-ceramic composite armor is metal-ceramic-metal laminated armor. When the projectile hits the ceramic panel, the projectile energy is absorbed through the ceramic micro-crushing process, causing the projectile to lose most of its kinetic energy. The metal back plate absorbs the residual kinetic energy of the projectile through plastic deformation to prevent the fragments from causing secondary damage. The metal panel on the projectile surface prevents the projectile and ceramic fragments from flying. However, this sandwich structure has low interface matching and discontinuous interface stress, which may cause the ceramic plate to crack rapidly due to external impact. It has weak impact resistance and collapse resistance, poor resistance to multiple strikes, and average comprehensive anti-ballistic performance. Therefore, it is necessary to improve the traditional sandwich laminated armor structure, realize the three-dimensional continuous composite of ceramic and metal materials, and develop new composite armor.

[0004] Patent search found that some solutions have been proposed in the prior art. For example, patent CN110895122A discloses a metal-ceramic gradient composite armor and its preparation method. The composite armor is made of metal-cast ceramic balls. From the bullet-facing surface to the bullet-receiving surface, the ceramic balls are densely arranged in 2-4 layers. The diameter difference between two adjacent rows of ceramic balls is 1mm, and the thickness of the ceramic balls accounts for 2 / 3 of the total thickness of the composite armor. However, further research shows that the ceramic balls in the invention adopt a dense stack structure, that is, the ceramic balls are in contact with each other, the ceramic content per unit volume is large, the hardness is excessive but the toughness is insufficient, which is not conducive to resisting multiple strikes, and the ceramic density gradient cannot be accurately controlled.

[0005] For another example, CN 110744064 A discloses a metal-ceramic composite lattice armor with a three-dimensional constraint structure, which includes a plurality of ceramic shaped columns and a metal alloy material, wherein the plurality of ceramic shaped columns are arranged in a regular pattern, and the metal alloy material is filled in the gaps between the ceramic shaped columns and covers the outer surface of the armor. However, further studies have shown that this simple three-dimensional constraint structure results in a single orientation of mechanical properties when resisting bullets, making it difficult to effectively disperse load stress, and having poor resistance to multiple strikes.

[0006] Accordingly, there is an urgent need in this field to find a preparation process that can achieve effective dispersion of load stress, while significantly improving the metal-ceramic interface matching and enhancing the interface strength, so as to provide a metal-ceramic composite armor with higher comprehensive anti-ballistic performance. Summary of the invention

[0007] In view of the above defects or needs of the prior art, the purpose of the present invention is to provide a method for preparing a porous ceramic reinforced metal composite armor with gradient porosity, wherein the operating process of the entire preparation process, especially the design mechanism, is improved, and targeted adjustments are made around the process parameters and requirements of some key steps. The corresponding composite armor can not only achieve effective dispersion of load stress, but also significantly improve the metal-ceramic interface matching, improve the interface strength, and make the armor have excellent anti-penetration ability, impact resistance, collapse resistance and multiple strike resistance, thereby obtaining better comprehensive anti-ballistic performance.

[0008] To achieve the above object, according to one aspect of the present invention, a method for preparing a porous ceramic reinforced metal composite armor with gradient porosity is provided, characterized in that the method comprises the following steps:

[0009] Step 1: Design of the 3D model of the ceramic core board

[0010] Design a corresponding three-dimensional model for the ceramic core plate to be prepared, wherein the porosity varies in a gradient in the anti-projectile direction and a multi-layer three-periodic minimal surface unit cell is provided in the anti-projectile direction;

[0011] Step 2: Preparation of ceramic core board

[0012] According to the three-dimensional model designed in step 1, silicon carbide ceramic powder is used as the main material, and a ceramic core plate blank of the corresponding shape is prepared by additive manufacturing technology; then, it is subjected to medium-temperature carbonization treatment at 800°C to 900°C and high-temperature siliconization reaction sintering at 1450°C to 1600°C, thereby obtaining the required ceramic core plate;

[0013] Step 3: Melt infiltration filling of metal substrate

[0014] The molten metal substrate is infiltrated and filled into the internal pores of the ceramic core plate prepared in step 2 by melt infiltration, thereby obtaining a metal-ceramic composite armor blank;

[0015] Step 4: Enhancement of interface bonding performance and overall performance

[0016] The metal-ceramic composite armor blank obtained in step three is subjected to a reinforcement treatment through a hot isostatic pressing process. During this process, the ceramic and metal are further densified and the composite interface diffusion connection is strengthened, thereby obtaining the final porous ceramic-reinforced metal composite armor.

[0017] As a further preference, in step one, the ceramic core plate preferably has a porosity of 10% to 30% on its bullet-facing surface, and preferably has a porosity of 50% to 80% on its back surface; the number of layers of the three-periodic minimal surface unit cell is 2 to 5.

[0018] As a further preferred embodiment, in step 2, the additive manufacturing technology is preferably a laser selective sintering process and a three-dimensional inkjet printing process, wherein for the laser selective sintering process, its process parameters include: the binder is one of phenolic resin and epoxy resin, and the total mass percentage in the composite powder is preferably designed to be 15% to 25%, the scanning spacing is preferably designed to be 0.1mm to 0.2mm, the scanning speed is preferably designed to be 1500mm / s to 2500mm / s, the laser power is preferably designed to be 5W to 10W, and the layer thickness is preferably designed to be 0.1mm to 0.3mm; for the three-dimensional inkjet printing process, its process parameters include: the printing layer thickness is preferably designed to be 0.10mm to 0.25mm, and the spray volume is preferably designed to be 55% to 100%.

[0019] As a further preference, in step 2, in addition to silicon carbide ceramic powder as the main material, an organic binder, a curing agent and silica sand etc. are preferably also included as auxiliary raw materials.

[0020] As a further preference, in step three, the melt infiltration method is preferably a pressure infiltration method or a vacuum pressure infiltration method, wherein when the metal substrate is heated to above the melting point, the ceramic core plate is preheated at the same time, and the preheating temperature is lower than the melting point of the ceramic material; the infiltration atmosphere is preferably argon and nitrogen, and the infiltration pressure is preferably designed to be 3MPa to 7MPa.

[0021] As further preferred, in step three, the metal substrate is preferably one of Al, Ti and alloys thereof.

[0022] As a further preference, in step four, the process parameters of the hot isostatic pressing process include: the temperature is preferably designed to be below the melting point of the metal substrate, and is 50% to 70% of the melting point of the metal substrate, the pressure is preferably designed to be 40MPa to 200MPa, and the insulation and pressure holding time is preferably designed to be 2h to 10h.

[0023] According to another aspect of the present invention, a corresponding porous ceramic reinforced metal composite armor is also provided.

[0024] As a further preference, the composite armor comprises a three-periodic minimal surface ceramic core plate reinforcement phase and a metal matrix phase, wherein the metal matrix phase penetrates into and completely fills the pores of the ceramic core plate and is periodically distributed in three-dimensional space after solidification.

[0025] In general, the above technical solution conceived by the present invention has the following technical advantages compared with the prior art:

[0026] (1) The present invention adopts a periodic minimal surface structure as the ceramic core plate structure of the composite armor. Compared with the existing ceramic-metal-ceramic "sandwich" structure, the design impact resistance and collapse resistance of the metal-ceramic composite structure of the present invention are greatly improved; at the same time, compared with the three-dimensional network ceramic skeleton structure and the densely packed ceramic ball structure, the three-periodic minimal surface ceramic core plate structure adopted by the present invention is continuous in geometric space and has a uniform mechanical structure. Its periodic ceramic surface has a dispersing effect on the load stress, which can effectively increase the armor's anti-projectile performance;

[0027] (2) The ceramic core plate prepared by the preparation method provided by the present invention has controllable structural parameters, controllable porosity of the ceramic core plate, and can also achieve porosity gradient control, making it easier to achieve ceramic core plate structural design from simple straight through to complex curved surface, and from disordered to regular structure;

[0028] (3) The present invention uses additive manufacturing technology to rapidly form complex structural parts, so that the appearance structure of the armor is no longer limited to sheet-shaped, and can achieve the preparation of composite armor with more complex shapes, which has a better match with the weapon system when it is attached;

[0029] (4) The present invention can not only further densify the ceramic core plate and the metal substrate by selectively selecting the hot isostatic pressing process, but also promote the uniform diffusion of the material components on both sides of the interface ceramic and metal layers, thereby achieving a gradient change in the interface structure, thereby obtaining an interface with high bonding strength, thereby greatly reducing the stress concentration caused by interface stress discontinuity and improving the mechanical and physical properties of the composite armor. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1It is an overall process flow chart of the method for preparing porous ceramic reinforced metal composite armor according to the present invention;

[0031] Figure 2 It is a schematic diagram of the structure and morphology of a Gyroid-type minimally curved metal-ceramic composite armor obtained according to a preferred embodiment of the present invention;

[0032] Figure 3 is a topographical diagram of a Gyroid-type silicon carbide ceramic core plate obtained according to a preferred embodiment of the present invention;

[0033] Figure 4 It is a flow chart for explaining the process of preparing composite lattice armor in more detail according to a preferred embodiment of the present invention.

[0034] Throughout the drawings, the same reference numerals are used to denote the same elements or structures, wherein:

[0035] 1- Ceramic core reinforcement phase 2- Metal substrate phase DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] Figure 1 The overall process flow chart of the method for preparing porous ceramic reinforced metal composite armor according to the present invention is as follows. Figure 1 To explain the present invention in more detail.

[0038] First, there is the step of designing the three-dimensional model of the ceramic core board.

[0039] In this step, a corresponding three-dimensional model is designed for the ceramic core plate to be prepared, in which the porosity varies in a gradient in the anti-projectile direction and a multi-layer three-periodic minimal surface unit cell is provided in the anti-projectile direction.

[0040] More specifically, for example, MATLAB can be used to control the parametric design of the minimal surface implicit function equation to obtain a three-dimensional CAD model of a ceramic core plate with different three-periodic minimal surface unit cell types, sizes and porosity gradients, and then the three-dimensional CAD model of the above-mentioned part to be formed can be sliced.

[0041] Next, there is the step of preparing the ceramic core board.

[0042] In this step, according to the three-dimensional model designed previously, silicon carbide ceramic powder is used as the main material, and a ceramic core plate blank of the corresponding shape can be prepared by additive manufacturing technology; then it undergoes medium-temperature carbonization treatment at 800°C to 900°C and high-temperature siliconization reaction sintering at 1450°C to 1600°C to obtain the required ceramic core plate.

[0043] Next, there is the step of melt infiltration filling of the metal substrate.

[0044] In this step, the molten liquid of the metal substrate can preferably be infiltrated and filled into the internal pores of the ceramic core plate obtained in step 2 by melt infiltration, thereby obtaining a metal-ceramic composite armor blank.

[0045] More specifically, the ceramic core plate is placed in a prefabricated mold and fixed in an infiltration furnace. The pressure difference is used to make the molten metal penetrate into the ceramic core plate and completely fill the pores. After cooling and solidification, a composite armor preform is obtained in which the ceramic core plate and the metal substrate are continuously and densely compounded in three-dimensional space.

[0046] Finally, there is the step of enhancing the interface bonding performance and overall performance.

[0047] In this step, the metal-ceramic composite armor blank obtained in step three is preferably subjected to a reinforcement treatment by a hot isostatic pressing process, during which the ceramic and metal are further densified and the composite interface diffusion connection is strengthened, thereby obtaining the final porous ceramic-reinforced metal composite armor.

[0048] More specifically, the composite armor preform is placed in a hot isostatic pressing chamber, the temperature and pressure are increased, and then the temperature and pressure are maintained for a period of time to complete the hot isostatic pressing process, so that the ceramic and metal are further densified and the ceramic-metal interface is diffusely connected, and the composite interface is strengthened. Finally, a metal-ceramic composite armor with excellent comprehensive anti-ballistic performance is obtained.

[0049] A number of specific embodiments are given below to illustrate the present invention in detail.

[0050] Example 1

[0051] (1) First, for example, a three-dimensional model of a Gyroid ceramic core plate with a gradient porosity change in the anti-ballistic direction can be constructed through the Gyroid implicit function equation, with a porosity of 20% on the bullet-facing surface and 50% on the back surface, and 4 layers of TPMS cells in the anti-ballistic direction. The three-dimensional model is then converted into an STL format file.

[0052] (2) Silicon carbide ceramic powder and phenolic resin were ball-milled and mixed for 6 hours to obtain the composite powder required for additive manufacturing, in which the mass proportion of phenolic resin was 18%. Based on the three-dimensional model constructed above, the laser selective sintering technology was used to quickly form the ceramic core blank. The specific printing process parameters were: scanning spacing of 0.15 mm, scanning speed of 2300 mm / s, laser power of 8 W, and layer thickness of 0.15 mm. After SLS forming, medium-temperature carbonization treatment was carried out. The specific operation was to place the blank in a tubular sintering furnace, heat it at 2 °C / min in an argon atmosphere, heat it to 450 °C and keep it for 1 hour, then heat it to 900 °C and keep it for 2 hours, and then cool it with the furnace. Finally, high-temperature siliconization treatment was carried out in a siliconizing furnace. Under the condition of vacuum degree of 0.01 MPa, the temperature was increased at 5 °C / min, and a heat preservation platform was set at 500 °C, 800 °C, and 1200 °C, and finally the temperature was raised to 1500 °C for siliconization reaction sintering.

[0053] (3) The sintered ceramic core plate is placed in a prefabricated armor mold and preheated to 400°C, while the aluminum alloy block is melted at 750°C. The mold is connected to a vacuum tank to maintain negative pressure in the mold cavity, and the negative pressure generated by the vacuum under the ceramic core is used to achieve the infiltration of the molten aluminum alloy into the ceramic body. The molten aluminum alloy infiltrates into the mold cavity until it is completely saturated and infiltrates into the pores of the ceramic core plate, and then naturally cooled to obtain a composite armor prefabricated body.

[0054] (4) The obtained metal-ceramic composite armor preform is placed in a hot isostatic pressing chamber for hot isostatic pressing, and the temperature and pressure are raised to 500°C and 70MPa, and the temperature and pressure are maintained for 3 hours; the ceramic core plate and the metal substrate are further densified, and the uniform diffusion connection of the ceramic and metal interface is achieved to enhance the interface bonding strength. A composite ceramic armor with high strength and high anti-ballistic performance is obtained.

[0055] Example 2

[0056] The preparation process is basically the same as that of Example 1, except that the three-dimensional printing technology is used in step (2). The organic binder mainly uses thermosetting phenolic resin as raw material, accounting for 50wt%, and then 40wt% furfuryl alcohol and 10wt% anhydrous ethanol are added to the phenolic resin for dilution. According to the three-dimensional model constructed in step (1), the three-dimensional printing technology is used to quickly form the ceramic core plate blank. The specific printing process parameters are: the printing layer thickness is 0.1mm, and the spray volume is 70%. After the 3DP forming is completed, a carburizing process is carried out, and a carburizing solution with a phenolic resin concentration of 50% is prepared. The blank is infiltrated at -90kPa for 10min and then cured at 200℃. Then a medium-temperature carbonization treatment is carried out, and the phenolic resin is completely carbonized at 1100℃ for 2h. Finally, siliconization reaction sintering is carried out at 1550℃.

[0057] Example 3

[0058] The preparation process is basically the same as that of Example 1, except that a titanium alloy metal substrate is used in step (3), and the titanium alloy block is melted at 1700° C. In step (4), the hot isostatic pressing process parameters of the composite armor preform are changed to increasing the temperature and pressure to 900° C. and 120 MPa, and maintaining the temperature and pressure for 3 hours; a composite lattice armor of a silicon carbide ceramic reinforcement phase and a titanium alloy substrate phase can be prepared.

[0059] Example 4

[0060] The preparation process is the same as that of Example 1, except that step (1) uses a diamond curved surface structure for design. The porosity of the bullet-facing surface is changed to 10%, the porosity of the back surface is changed to 60%, and a three-layer TPMS unit cell is designed in the anti-bullet direction.

[0061] Example 5

[0062] The preparation process is the same as that of Example 1, except that the carbonization temperature in step (2) is changed to 850° C. and the siliconizing reaction sintering temperature is changed to 1600° C. A ceramic core plate with high densification and high mechanical strength can also be obtained.

[0063] Example 6

[0064] The preparation process is the same as that of Example 1, except that in step (2), the binder is replaced by epoxy resin with a mass ratio of 16%, and 5 wt% of carbon black is added to the composite powder as a sintering aid.

[0065] Example 7

[0066] The preparation process is the same as that of Example 1, except that the pressure infiltration method is used in step (3), and the infiltration pressure is 5 MPa. High-pressure nitrogen is introduced, and the molten aluminum alloy penetrates the internal pores of the ceramic core plate by using the pressure difference between the inside and outside of the ceramic core plate, and the composite armor preform is obtained after cooling and solidification.

[0067] Example 8

[0068] (1) First, a three-dimensional model of a primitive ceramic core plate with a gradient porosity change in the anti-ballistic direction is constructed by using a primitive implicit function equation. The porosity of the anti-ballistic surface is 10%, the porosity of the back surface is 70%, and there are 5 layers of TPMS cells in the anti-ballistic direction. The three-dimensional model is converted into an STL format file.

[0069] (2) The silicon carbide ceramic powder, phenolic resin and hexamethylenetetramine are ball-milled for 12 hours to obtain the desired composite powder, wherein the content of the binder phenolic resin is 13wt%, and the content of the curing agent hexamethylenetetramine is 6wt%. According to the three-dimensional model constructed in step (1), the laser selective sintering technology is used to quickly form the ceramic core plate blank, and the specific printing process parameters are: scanning spacing of 0.15mm, scanning speed of 2200mm / s, laser power of 10W, and layer thickness of 0.1mm. After SLS forming is completed, medium-temperature carbonization treatment is carried out, and finally siliconization reaction sintering is carried out at 1550°C.

[0070] (3) The sintered ceramic core plate is preheated to 1000°C, the ceramic core plate and the titanium alloy are placed in a pre-prepared mold and fixed in a vacuum pressure infiltration furnace, heated to 1700°C and maintained at a certain vacuum degree, so that the titanium alloy melt melts and gradually wraps the entire ceramic core plate, and high-pressure nitrogen is introduced. The pressure difference between the inside and outside of the ceramic core plate is used to make the molten metal penetrate into the ceramic core plate and completely fill the pores. After cooling and solidification, a composite armor preform is obtained.

[0071] (4) The metal-ceramic composite armor preform obtained in step (3) is placed in a hot isostatic pressing chamber for hot isostatic pressing, and the temperature and pressure are increased to 900° C. and 120 MPa, and the temperature and pressure are maintained for 5 hours; the ceramic core plate and the metal substrate are further densified, and the uniform diffusion connection of the ceramic and metal interface is achieved to enhance the interface bonding strength. A composite ceramic armor with high strength and high anti-ballistic performance is obtained.

[0072] Example 9

[0073] The preparation process is the same as that of Example 5, except that in the armor gradient structure design part in step (1), the porosity of the bullet-facing surface is changed to 15%, and the porosity of the back plate surface is changed to 80%.

[0074] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for preparing a porous ceramic reinforced metal composite armor with gradient porosity, characterized in that: The method comprises the following steps: Step 1: Design of the 3D model of the ceramic core board Design a corresponding three-dimensional model for the ceramic core plate to be prepared, wherein the porosity varies in a gradient in the anti-projectile direction and a multi-layer three-periodic minimal surface unit cell is provided in the anti-projectile direction; Step 2: Preparation of ceramic core board According to the three-dimensional model designed in step 1, silicon carbide ceramic powder is used as the main material, and a ceramic core plate blank of the corresponding shape is prepared by additive manufacturing technology; then, it is subjected to medium-temperature carbonization treatment at 800°C to 900°C and high-temperature siliconization reaction sintering at 1450°C to 1600°C, thereby obtaining the required ceramic core plate; Step 3: Melt infiltration filling of metal substrate The molten metal substrate is infiltrated and filled into the internal pores of the ceramic core plate prepared in step 2 by melt infiltration, thereby obtaining a metal-ceramic composite armor blank; Step 4: Enhancement of interface bonding performance and overall performance The metal-ceramic composite armor blank obtained in step three is subjected to a reinforcement treatment through a hot isostatic pressing process. During this process, the ceramic and metal are further densified and the composite interface diffusion connection is strengthened, thereby obtaining the final porous ceramic-reinforced metal composite armor.

2. The preparation method according to claim 1, characterized in that In step one, the ceramic core plate has a porosity of 10% to 30% on its bullet-facing surface and a porosity of 50% to 80% on its back surface; the number of layers of the three-periodic minimal surface unit cell is 2 to 5.

3. The preparation method according to claim 2, characterized in that: In step 2, the additive preparation technology is a laser selective sintering process and a three-dimensional printing forming process. For the laser selective sintering process, its process parameters include: the binder is one of phenolic resin and epoxy resin, and the total mass percentage in the composite powder is designed to be 15% to 25%, the scanning spacing is designed to be 0.1mm to 0.2mm, the scanning speed is designed to be 1500mm / s to 2500mm / s, the laser power is designed to be 5W to 10W, and the layer thickness is designed to be 0.1mm to 0.3mm; for the three-dimensional printing forming process, its process parameters include: the printing layer thickness is designed to be 0.10mm to 0.25mm, and the spray volume is designed to be 55% to 100%.

4. The preparation method according to any one of claims 1 to 3, characterized in that: In step 2, in addition to silicon carbide ceramic powder as the main material, an organic binder, a curing agent and silica sand are also included as auxiliary raw materials.

5. The preparation method according to any one of claims 1 to 3, characterized in that: In step three, the melt infiltration method is a pressure infiltration method or a vacuum pressure infiltration method, wherein when the metal substrate is heated to above the melting point, the ceramic core plate is preheated at the same time, and the preheating temperature is lower than the melting point of the ceramic material; the infiltration atmosphere is argon and nitrogen, and the infiltration pressure is designed to be 3MPa~7MPa.

6. The preparation method according to claim 5, characterized in that: In step three, the metal substrate is one of Al, Ti and alloys thereof.

7. The preparation method according to any one of claims 1 to 3, characterized in that: In step 4, the process parameters of the hot isostatic pressing process include: the temperature is designed to be below the melting point of the metal substrate and is 50% to 70% of the melting point of the metal substrate, the pressure is designed to be 40 MPa to 200 MPa, and the heat preservation and pressure holding time is designed to be 2h to 10h.

8. A porous ceramic reinforced metal composite armor, characterized in that: It is prepared by the method according to any one of claims 1 to 7.

9. The porous ceramic reinforced metal composite armor according to claim 8, characterized in that: The composite armor comprises a three-periodic minimal surface ceramic core plate reinforcement phase and a metal matrix phase, wherein the metal matrix phase infiltrates and completely fills the pores of the ceramic core plate and is periodically distributed in three-dimensional space after solidification.

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