A ceramic powder reinforced multilayer metal and intermetallic compound composite structure and preparation method thereof

Abstract

A ceramic powder reinforced multilayer metal and intermetallic compound composite structure and a preparation method thereof belong to the technical field of structural and functional composite material preparation. It is a multilayer structure, which is formed by alternately stacking metal plates and ceramic metal plates and realizing interface composite through hot pressing and diffusion, and the relative melting point of the metal in the ceramic metal plate is higher than that of the metal in the metal plate. Ceramic powder is sprayed on the surface of the metal plate in long strips at intervals to obtain a ceramic metal plate. The multilayer structure includes N composite units, and N is not less than 2. A layer of metal plate is placed between two composite units, and each composite unit is a three-layer structure, wherein the upper and lower layers are ceramic metal plates, and the middle layer is a metal plate. The present invention has a multilayer gradient organizational structure and a multilayer performance gradient response mechanism, showing excellent energy absorption and impact resistance, and the preparation process is suitable for the one-piece molding of large-size and complex-shaped protective armor, and has good application prospects.

Description

Technical Field

[0001] The present invention belongs to the technical field of structural and functional composite structure preparation, and in particular relates to a ceramic powder reinforced multilayer metal and intermetallic compound composite structure and a preparation method thereof. Background Art

[0002] Since the concept of armor protection emerged, people have been constantly looking for materials that meet excellent ballistic protection performance. Ceramic materials have been widely studied and applied due to their excellent protection performance of high hardness, high modulus, high strength and low density. The current mainstream armor structure is ceramic composite armor, which is a ceramic panel + metal back plate. In this structure, the difference in wave impedance between the ceramic and metal interfaces is too large, resulting in large reflected tensile waves, severe ceramic fragmentation, and affecting the protection capability of the ceramic composite armor structure. It is necessary to develop new armor structure materials with high protection capabilities.

[0003] Micro-laminated armor is a bionic material. Inspired by the special structure of shells in nature, that is, the overlapping structure of high-strength brittle layers and good toughness organic layers, a "metal-intermetallic compound-laminated composite structure" (metal intermetalliclaminate, MIL material) was designed and applied. Intermetallic compounds provide high specific modulus and specific strength, and ductile metals are used to provide toughness for the system and support the entire laminated structure. This material not only has a stress field of energy dissipation structure through a small interlayer spacing and multi-interface effect, but can also effectively improve the ability of the laminated structure to resist transmitted and reflected waves, and improve the fracture toughness of the armor material. At the same time, since the interface of the intermetallic compound layer / metal layer is a metallurgical bond obtained by reaction diffusion, its microstructural continuity and good interface bonding strength are guaranteed. The armor material has excellent properties such as low density, high strength, high toughness and high specific modulus.

[0004] In the mid-1990s, researchers at the Albany Research Center in the United States first used vacuum sintering to prepare Ti / Al3Ti intermetallic compound-based composite structures. In the early 21st century, researchers at the University of California, San Diego, developed a new material-metallic compound-based composite structure (MIL) and a new preparation technology-vacuum-free sintering process, and prepared a lightweight, high-strength, environmentally friendly, low-cost, and economically efficient Ti-Al sandwich armor composite structure. The results show that under given impact conditions, the material has better elastic resistance than other armor materials with similar density. The laboratory of the University of California, USA, conducted an experiment in which a tungsten alloy (94W7FeCo) penetrator was vertically incident on a Ti / Al3Ti composite armor target plate (initial thickness 20 mm) at an initial velocity of 900 m / s. Under the same conditions, the final penetration depth of the projectile in the Ti / Al3Ti composite armor was less than 10 mm, which was slightly better than the penetration depth of the tungsten alloy projectile in the homogeneous armor steel, but the surface density of the MIL material was only 40% of that of the armor steel. This shows that the protection factor of this micro-laminated composite armor is 2 to 3 times that of homogeneous armor steel, and it has good application prospects.

[0005] At present, the strong layer of micro-laminated armor is mostly intermetallic compounds, but the hardness of the intermetallic compound phase is only 400~700HV. When used as a protective material, although its layered structure can effectively absorb, dissipate or disperse energy, it cannot effectively abrade and destroy the warhead, and its anti-ballistic performance still needs to be further improved. The hardness of ceramics in ceramic-back plate structure armor is as high as 1200 HV~3000 HV. Therefore, using the design concept of micro-laminated armor materials, introducing ceramic materials, and obtaining bulletproof materials with unified high strength and high toughness through laminated structures is a feasible direction for the development of new armor materials. Summary of the invention

[0006] The present invention provides a ceramic powder reinforced multi-layer metal and intermetallic compound composite structure and a preparation method thereof to solve the problems of poor resistance to multiple projectiles, obvious structural design defects and low protection coefficient of traditional ceramic and ceramic composite armor protection materials. The present invention forms a semi-solid or liquid state by hot pressing and expanding a ductile metal with a low melting point, covers a ceramic powder layer, and generates a high-strength intermetallic compound through a diffusion reaction, so that metallurgical bonding is achieved within and between the composite unit layers to construct an overall composite structure.

[0007] The purpose of the present invention is achieved through the following technical solutions:

[0008] A ceramic powder reinforced multilayer metal and intermetallic compound composite structure is a multilayer structure, which is formed by alternately stacking metal plates and ceramic metal plates, and realizing interface composite through hot pressing and diffusion, and the relative melting point of the metal in the ceramic metal plate is higher than that of the metal in the metal plate. The ceramic metal plate is obtained by spraying high-strength and high-hardness ceramic powder on the surface of the metal plate in long strips to obtain a strip ceramic layer, wherein the strip ceramic layer has a thickness of 0.1-3mm, the spacing distance is greater than the width of the ceramic powder layer by 1-10mm, and the density of the strip ceramic layer is 90-99.9%.

[0009] The multilayer structure includes N composite units, where N is not less than 2. A metal plate is placed between two composite units, and each composite unit is a three-layer structure, where the upper and lower layers are ceramic metal plates and the middle layer is a metal plate. The material of the metal plate between the two composite units is the same as that of the metal plate in one composite unit.

[0010] In the plurality of composite units, the specific requirement for spraying strip ceramic sheets on the multi-layer ceramic metal plate is that the center of the strip ceramic layer in each layer of the ceramic metal plate coincides with the center of the interval between two adjacent strip ceramic layers in the adjacent layer of the ceramic metal plate. The ceramic powder is selected from boron carbide, tungsten carbide or silicon carbide, and is a spherical powder with a diameter of 50nm~500μm.

[0011] The metal material in the metal plate and the ceramic metal plate is selected from pure aluminum, pure magnesium, pure titanium, aluminum alloy, magnesium alloy and titanium alloy, and the thickness is 0.1-20 mm, preferably 0.1-10 mm.

[0012] The above-mentioned method for preparing a ceramic powder reinforced multilayer metal and intermetallic compound composite structure comprises the following steps:

[0013] (1) Sieve the ceramic powder and dry it in a drying furnace to obtain ceramic powder for later use;

[0014] (2) Use 200# and 400# sandpaper to finely grind the surface of the lightweight and tough metal plate, then use acetone and clean water to ultrasonically clean the surface of the plate, and blow dry it for later use;

[0015] (3) The ceramic powder obtained in step (1) is placed in a powder spraying device, and a strip-shaped ceramic layer is sprayed on the surface of a relatively high-melting-point metal plate according to a set strip width, thickness and spacing distance to obtain a ceramic metal plate.

[0016] (4) Two ceramic metal plates coated with strip-shaped ceramic layers are placed in an alternating manner, and a metal plate with a relatively low melting point is placed between the two ceramic metal plates. The relative melting point of the metal in the metal plate is lower than the relative melting point of the metal in the ceramic metal plate. The two ceramic metal plates and the metal plate form a composite unit. A metal plate with a relatively low melting point is also placed between multiple composite units to form a prefabricated plate.

[0017] (5) The prefabricated plate is placed in a hot pressing device and kept at 300°C to 1200°C for 30 to 500 min. During the entire holding process, a pressure of 20 to 300 MPa is applied. By controlling the temperature, pressure and time of the hot pressing process, the two ductile metals form an interface metallurgical bond mainly composed of intermetallic compounds.

[0018] Furthermore, the ceramic powder spraying device in step (3) may be a plasma spraying, arc spraying, flame spraying or supersonic flame spraying device.

[0019] Furthermore, the hot pressing equipment in step (5) may be a hot pressing furnace or a hot isostatic pressing furnace.

[0020] Furthermore, the metal plate can be prefabricated into complex shapes such as curved surfaces, which can meet the needs of forming large-scale and complex components in one go.

[0021] Furthermore, the prefabricated panel can be in a free state laterally, or can be constrained by a mold (the prefabricated panel is placed in a mold, the prefabricated panel is constrained laterally by the mold, and the mold is placed in a hot pressing device).

[0022] The multi-composite structure constructed of high-density ceramic powder layers and metals and intermetallic compounds provided by the present invention can enable multi-level structures with different mechanical properties to be superimposed, promote the joint action of multiple composite effects such as crack passivation, deflection, bending and bridging, and manifest as a higher energy dissipation stress field. Under large deformation and high impact load, interlaminar fracture failure will not occur, and its performance can be effectively controlled by the gradient of the mechanical properties of the stack, the thickness ratio between the layers, and the morphology and size distribution of the diffusion layer products.

[0023] Compared with the prior art, the present invention has the following advantages: the present invention adopts the design theory of laminated composite structure and uses powder spraying technology to evenly distribute ceramics in strip structures on high-melting-point metal plates. The metal plates play a rigid supporting role for the strip ceramics, delaying the premature failure of the ceramics during the penetration of the projectile; the tough metal plates coated with strip ceramic layers are alternately placed, and the composite unit formed by the low-melting-point metal plate is placed in the middle, which realizes the discontinuous distribution of ceramic materials on a single layer, effectively avoiding the protection failure caused by ceramic collapse resistance. Through the superposition of multiple composite units, the high strength and hardness characteristics of ceramic materials are fully utilized, the high strength and hardness of ceramics and the high plasticity and toughness characteristics of metal foils complement each other, and intermetallic compounds are formed between high and low melting point metal foils. The interface realizes metallurgical bonding, perfectly covers the strip ceramics, and ensures the multi-layer overall protection of the composite unit. The ceramic powder reinforced multi-layer metal and intermetallic compound composite structure after hot pressing has good density and can show excellent anti-ballistic performance (especially anti-multiple bullet performance) and impact resistance. This material combines traditional ceramic-back plate composite armor with micro-laminated armor design concepts very well, and also breaks through the problem of poor collapse resistance of ceramic-back plate structural armor, forming a new direction for ceramic / metal composite laminated materials and showing a broader application space. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] FIG1 (a) is a top view of the upper ceramic metal plate in a composite unit, where A is a strip-shaped ceramic layer and B is a high-melting-point ductile metal plate;

[0025] FIG1( b ) is a front view of the upper ceramic metal plate in a composite unit, wherein A is a strip-shaped ceramic layer and B is a high melting point ductile metal plate;

[0026] Figure 1 (c) is a top view of the lower ceramic metal plate in a composite unit, where A is a strip-shaped ceramic layer and B is a high-melting-point ductile metal plate;

[0027] Figure 1 (d) is a front view of the lower ceramic metal plate in a composite unit, where A is a strip-shaped ceramic layer and B is a high-melting-point ductile metal plate;

[0028] Figure 2 A front view of a single composite unit consisting of a ductile metal plate coated with a strip-shaped ceramic layer and a low-melting-point metal plate placed in the middle, wherein A is the strip-shaped ceramic layer, B is the high-melting-point ductile metal plate, and C is the low-melting-point metal plate;

[0029] Figure 3 A front view of a ceramic powder reinforced multilayer metal and intermetallic compound composite structure formed by stacking multiple composite units, with a layer of low melting point metal plate placed between the composite units to form a prefabricated plate;

[0030] Figure 4This is a schematic diagram of the ceramic powder reinforced multilayer metal and intermetallic compound composite structure obtained after the prefabricated plate is hot-pressed and composited. DETAILED DESCRIPTION

[0031] The present invention is further described below in conjunction with specific embodiments.

[0032] Example 1: A ceramic powder reinforced multilayer metal and intermetallic compound composite structure and its preparation method:

[0033] The ceramic powder reinforced multilayer metal and intermetallic compound composite structure is a multilayer structure, which is formed by alternately stacking metal plates and ceramic metal plates, and realizing interface composite through hot pressing and diffusion, and the relative melting point of the metal in the ceramic metal plate is higher than that of the metal in the metal plate. The ceramic metal plate is made of tungsten carbide ceramic powder sprayed on a 1mm thick TC4 titanium alloy metal plate in a long strip-shaped interval, wherein the thickness of the strip ceramic layer is 0.5mm, the spacing distance is greater than the width of the ceramic powder layer by 3mm, and the density of the strip ceramic layer is 95%.

[0034] The multi-layer structure includes 6 composite units. A layer of 0.3 mm aluminum plate is placed between two composite units, and each composite unit is a three-layer structure, wherein the upper and lower layers are ceramic metal plates and the middle layer is a 0.3 mm aluminum plate.

[0035] In the plurality of composite units, the specific requirement for spraying strip ceramic sheets on the multi-layer ceramic metal plates is that the center of the strip ceramic layer in each layer of the ceramic metal plate coincides with the center of the interval between two adjacent strip ceramic layers in the adjacent layer of the ceramic metal plate. The ceramic powder is selected from tungsten carbide.

[0036] Follow these steps:

[0037] (1) Sieve tungsten carbide ceramic powder with a diameter of 50 μm and place it in a drying furnace at 120°C for 1 hour for later use.

[0038] (2) Use 200# and 400# sandpaper to finely grind the surface of the ductile metal plate in turn, then use acetone and clean water to ultrasonically clean the surface of the plate, and blow dry it for later use.

[0039] (3) The tungsten carbide ceramic powder is placed in a flame spraying device, and a strip-shaped ceramic layer is sprayed on the surface of a 1 mm thick TC4 titanium alloy metal plate using flame spraying technology to obtain a ceramic metal plate.

[0040] (4) Two ceramic metal plates are placed in an alternating manner, and a layer of aluminum plate is placed between the two ceramic metal plates to form a composite unit, and a layer of aluminum plate is also placed between multiple composite units to form a prefabricated plate. The multiple composite units are a repeated structure, and in one composite unit, the center of the strip-shaped ceramic layer in the first ceramic metal plate coincides with the center of the interval between two adjacent strip-shaped ceramic layers in the second ceramic metal plate.

[0041] (5) The mold is used to constrain the prefabricated plate laterally, and the mold is placed in a hot isostatic pressing furnace and kept at 600°C for 240 min. At the same time, a pressure of 20 MPa is applied during the entire insulation process, so that the two ductile metals form an interface metallurgical bond mainly composed of intermetallic compounds, and finally a multilayer metal-intermetallic compound composite structure reinforced with tungsten carbide ceramic powder is obtained.

[0042] Example 2: A ceramic powder reinforced multilayer metal and intermetallic compound composite structure and its preparation method:

[0043] The ceramic powder reinforced multilayer metal and intermetallic compound composite structure is a multilayer structure, which is formed by alternately stacking metal plates and ceramic metal plates, and realizing interface composite through hot pressing and diffusion, and the relative melting point of the metal in the ceramic metal plate is higher than that of the metal in the metal plate. The ceramic metal plate is made of tungsten carbide ceramic powder sprayed on a 10mm thick AZ31 magnesium alloy metal plate in a long strip-shaped interval, wherein the thickness of the strip ceramic layer is 3mm, the spacing distance is greater than the width of the ceramic powder layer 8mm, and the density of the strip ceramic layer is 90%.

[0044] The multi-layer structure includes 8 composite units. A 5 mm thick magnesium metal plate is placed between two composite units, and each composite unit is a three-layer structure, wherein the upper and lower layers are ceramic metal plates and the middle layer is a 5 mm thick magnesium metal plate.

[0045] In the plurality of composite units, the specific requirement for spraying strip ceramic sheets on the multi-layer ceramic metal plates is that the center of the strip ceramic layer in each layer of the ceramic metal plate coincides with the center of the interval between two adjacent strip ceramic layers in the adjacent layer of the ceramic metal plate. The ceramic powder is selected from boron carbide.

[0046] Follow these steps:

[0047] (1) Boron carbide ceramic powder with a diameter of 500 μm was sieved and placed in a drying furnace at 120° C. for 1 hour for later use.

[0048] (2) Use 200# and 400# sandpaper to finely grind the surface of the ductile metal plate in turn, then use acetone and clean water to ultrasonically clean the surface of the plate, and blow dry it for later use.

[0049] (3) The boron carbide ceramic powder is placed in a plasma spraying device, and a strip ceramic layer is sprayed on the surface of a 10 mm thick AZ31 magnesium alloy metal plate using plasma spraying technology to obtain a ceramic metal plate, wherein the thickness of the strip ceramic layer is 3 mm, and the spacing distance is greater than the width of the ceramic powder layer 8 mm.

[0050] (4) Two ceramic metal plates coated with strip boron carbide ceramic layers are placed in an alternating manner, and a layer of 5 mm thick magnesium metal plate is placed between the two ceramic metal plates to form a composite unit. The relative melting point of the magnesium alloy metal plate is higher than that of the magnesium metal plate. A layer of magnesium alloy metal plate is also placed between multiple composite units to form a prefabricated plate.

[0051] (5) The mold is used to constrain the prefabricated plate laterally, and the mold is placed in a hot press furnace and kept at 400°C for 200 min. At the same time, a pressure of 60 MPa is applied during the entire insulation process, so that the two ductile metals form an interface metallurgical bond mainly composed of intermetallic compounds, and finally a multilayer metal-intermetallic compound composite structure reinforced with boron carbide ceramic powder is obtained.

[0052] Example 3: A ceramic powder reinforced multilayer metal and intermetallic compound composite structure and its preparation method:

[0053] The ceramic powder reinforced multilayer metal and intermetallic compound composite structure is a multilayer structure, which is formed by alternately stacking metal plates and ceramic metal plates, and realizing interface composite through hot pressing and diffusion, and the relative melting point of the metal in the ceramic metal plate is higher than that of the metal in the metal plate. The ceramic metal plate is made of tungsten carbide ceramic powder sprayed on a 0.2 mm thick pure titanium metal plate in a long strip-shaped interval, wherein the thickness of the strip ceramic layer is 0.1 mm, the spacing distance is greater than the width of the ceramic powder layer by 1 mm, and the density of the strip ceramic layer is 99.9%.

[0054] The multi-layer structure includes 4 composite units. A 0.1 mm TC4 titanium alloy plate is placed between two composite units, and each composite unit is a three-layer structure, wherein the upper and lower layers are ceramic metal plates and the middle layer is a 0.1 mm TC4 titanium alloy plate.

[0055] In the plurality of composite units, the specific requirement for spraying strip ceramic sheets on the multi-layer ceramic metal plates is that the center of the strip ceramic layer in each layer of the ceramic metal plate coincides with the center of the interval between two adjacent strip ceramic layers in the adjacent layer of the ceramic metal plate. The ceramic powder is selected from silicon carbide.

[0056] Follow these steps:

[0057] (1) Sieves silicon carbide ceramic powder with a diameter of 100 μm and dries it in a drying furnace at 120° C. for 1 hour.

[0058] (2) Use 200# and 400# sandpaper to finely grind the surface of the ductile metal plate in turn, then use acetone and clean water to ultrasonically clean the surface of the plate, and blow dry it for later use.

[0059] (3) The silicon carbide ceramic powder is placed in an arc spraying device, and an arc spraying technique is used to spray a strip-shaped ceramic layer on the surface of a pure titanium metal plate to obtain a ceramic metal plate.

[0060] (4) Two ceramic metal plates coated with strip-shaped silicon carbide ceramic layers are placed in an alternating manner, and a layer of TC4 titanium alloy plate (Ti6Al4V) is placed between the two ceramic metal plates to form a composite unit. A layer of TC4 titanium alloy plate (Ti6Al4V) is also placed between multiple composite units to form a prefabricated plate. Among them, the melting point of pure titanium is 1668℃> the melting point of TC4 titanium alloy is 1540~1650℃.

[0061] (5) The mold is used to constrain the prefabricated plate laterally, and the mold is placed in a hot pressing device and kept at 1000°C for 300 min. At the same time, a pressure of 280 MPa is applied during the entire insulation process, so that the two ductile metals form an interface metallurgical bond mainly composed of intermetallic compounds, and finally a multilayer metal-intermetallic compound composite structure reinforced with silicon carbide ceramic powder is obtained.

[0062] Example 4: A ceramic powder reinforced multilayer metal and intermetallic compound composite structure and its preparation method:

[0063] The ceramic powder reinforced multilayer metal and intermetallic compound composite structure is a multilayer structure, which is formed by alternately stacking metal plates and ceramic metal plates, and realizing interface composite through hot pressing and diffusion, and the relative melting point of the metal in the ceramic metal plate is higher than that of the metal in the metal plate. The ceramic metal plate is sprayed with tungsten carbide ceramic powder in long strips on a 15mm thick 7A52 aluminum alloy metal plate, wherein the thickness of the strip ceramic layer is 2.5 mm, the spacing distance is greater than the width of the ceramic powder layer 8 mm, and the density of the strip ceramic layer is 99%.

[0064] The multi-layer structure includes 6 composite units. A 10 mm thick AZ31 magnesium alloy metal plate is placed between two composite units, and each composite unit is a three-layer structure, wherein the upper and lower layers are ceramic metal plates and the middle layer is a 10 mm thick AZ31 magnesium alloy metal plate.

[0065] In the plurality of composite units, the specific requirement for spraying strip ceramic sheets on the multi-layer ceramic metal plates is that the center of the strip ceramic layer in each layer of the ceramic metal plate coincides with the center of the interval between two adjacent strip ceramic layers in the adjacent layer of the ceramic metal plate. The ceramic powder is selected from silicon carbide.

[0066] Follow these steps:

[0067] (1) Sieves silicon carbide ceramic powder with a diameter of 280 μm and places it in a drying furnace to dry at 120° C. for 1 hour for later use;

[0068] (2) Use 200# and 400# sandpaper to finely grind the surface of the ductile metal plate in turn, then use acetone and clean water to ultrasonically clean the surface of the plate, and blow dry it for later use;

[0069] (3) Silicon carbide ceramic powder is placed in a supersonic flame spraying device, and a strip-shaped ceramic layer is sprayed on the surface of a 7A52 aluminum alloy metal plate using flame spraying technology to obtain a ceramic metal plate.

[0070] (4) Two ceramic metal plates coated with strip-shaped tungsten carbide ceramic layers are placed alternately and oppositely, and a layer of AZ31 magnesium alloy metal plate is placed between the two ceramic metal plates to form a composite unit. A layer of AZ31 magnesium alloy metal plate is also placed between multiple composite units to form a prefabricated plate.

[0071] (5) The mold is used to constrain the prefabricated plate laterally, and the mold is placed in a hot pressing device and kept at 450°C for 350 min. At the same time, a pressure of 180 MPa is applied during the entire insulation process, so that the two ductile metals form an interface metallurgical bond mainly composed of intermetallic compounds, and finally a multilayer metal-intermetallic compound composite structure reinforced with silicon carbide ceramic powder is obtained.

[0072] The above-described embodiments merely express the implementation methods of the present invention, but they cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A ceramic powder reinforced multilayer metal and intermetallic compound composite structure, characterized in that: The ceramic powder reinforced multi-layer metal and intermetallic compound composite structure is a multi-layer structure, which is formed by alternately stacking metal plates and ceramic metal plates and achieving interface composite through hot pressing and diffusion, and the relative melting point of the metal in the ceramic metal plate is higher than that of the metal in the metal plate; the ceramic metal plate includes a metal plate and a strip-shaped ceramic layer sprayed on its surface at long strip intervals, and the material of the strip-shaped ceramic layer is ceramic powder; The multi-layer structure includes N composite units, where N is not less than 2; a metal plate is placed between two composite units, and each composite unit is a three-layer structure, where the upper and lower layers are ceramic metal plates and the middle layer is a metal plate; the material of the metal plate between the two composite units is the same as the material of the metal plate in one composite unit; In the plurality of composite units, the specific requirements for the strip-shaped ceramic sheets sprayed on the multi-layer ceramic metal plates are: the center of the strip-shaped ceramic layer in each layer of the ceramic metal plate coincides with the center of the interval between two adjacent strip-shaped ceramic layers in the adjacent layer of the ceramic metal plate; The thickness of the strip ceramic layer is 0.1-3 mm, and the spacing distance is 1-10 mm greater than the width of the ceramic powder layer; the thickness of the metal plate and the metal in the ceramic metal plate is 0.1-20 mm.

2. The ceramic powder reinforced multilayer metal and intermetallic compound composite structure according to claim 1, characterized in that: The density of the strip-shaped ceramic layer is 90-99.9%.

3. The ceramic powder reinforced multilayer metal and intermetallic compound composite structure according to claim 1, characterized in that: The ceramic powder is selected from boron carbide, tungsten carbide or silicon carbide, and is a spherical powder with a diameter of 50nm-500μm.

4. The ceramic powder reinforced multilayer metal and intermetallic compound composite structure according to claim 1, characterized in that: The metal material in the metal plate and the ceramic metal plate is selected from pure aluminum, pure magnesium, pure titanium, aluminum alloy, magnesium alloy and titanium alloy, and the thickness is 0.1-10 mm.

5. A method for preparing a ceramic powder reinforced multilayer metal and intermetallic compound composite structure according to any one of claims 1 to 4, characterized in that: The steps include: (1) Sieve the ceramic powder and dry it in a drying furnace to obtain ceramic powder for later use; (2) Fine grinding and cleaning of the metal plate surface; (3) placing the ceramic powder obtained in step (1) into a powder spraying device, and spraying a strip-shaped ceramic layer on the surface of a relatively high melting point metal plate according to a set strip width, thickness and spacing distance to obtain a ceramic metal plate; (4) two ceramic metal plates coated with strip-shaped ceramic layers are placed in an alternating manner, and a metal plate with a relatively low melting point is placed between the two ceramic metal plates, the relative melting point of the metal in the metal plate is lower than the relative melting point of the metal in the ceramic metal plate, and the two ceramic metal plates and the metal plate form a composite unit; a metal plate with a relatively low melting point is also placed between multiple composite units to form a prefabricated plate; (5) The prefabricated plate is placed in a hot pressing device and kept at 300°C to 1200°C for 30 to 500 min. During the entire holding process, a pressure of 20 to 300 MPa is applied. By controlling the temperature, pressure and time of the hot pressing process, the two ductile metals form an interface metallurgical bond mainly composed of intermetallic compounds.

6. The preparation method according to claim 5, characterized in that: The powder spraying device in step (3) is a plasma spraying, arc spraying, flame spraying or supersonic flame spraying device.

7. The preparation method according to claim 5, characterized in that: The hot pressing equipment in step (5) is a hot pressing furnace or a hot isostatic pressing furnace.

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