Composite bulletproof insert and preparation method thereof

Abstract

The present invention relates to the technical field of body protection equipment, and in particular to a composite bulletproof insert plate and a preparation method thereof, wherein the composite bulletproof insert plate comprises a ceramic / titanium alloy plate and a UHMWPE plate bonded to each other; the ceramic / titanium alloy plate is sprayed with a certain thickness of titanium alloy and polyurea resin in sequence on two surface surfaces of a curved ceramic plate; and a crack-stop layer and an anti-dent layer are compounded in sequence along the surface of the polyurea resin. The advantages of the present invention are that the bulletproof insert plate of the present invention adopts a combination of a curved ceramic plate and a titanium alloy coating, which improves the protective strength and impact resistance; the lightness and flexibility of the bulletproof insert plate are enhanced by superimposing the UHMWPE plate and the Kevlar fiber knitted cloth; the addition of the polyurea buffer protective layer improves the impact resistance response and protective effect of the bulletproof insert plate. The bulletproof insert plate of the present invention has excellent ballistic performance and can effectively defend against penetration by high kinetic energy projectiles.

Description

Technical Field

[0001] The present invention relates to the technical field of body protection equipment, and in particular to a composite bulletproof insert plate and a preparation method thereof. Background Art

[0002] As an important protective unit for individual bulletproof, the material system of bulletproof plates has evolved from ancient rattan and leather materials to bronze armor, and later developed into metal-based armor. It has been developing into protective materials based on Kevlar, an aramid fiber invented by DuPont, and UHMWPE, an ultra-molecular weight polyethylene fiber composite material invented by the Dutch, and has attracted global attention.

[0003] In recent years, due to the continuous escalation of local wars, the demand for bulletproof plates in various countries has been increasing. Through the evolution of the material system, it can be seen that lightweight and functionalization are the unchanging themes of individual protective equipment, and the effective combination of different materials is the key to improving the bulletproof function and weight bottleneck of bulletproof plates.

[0004] Ceramic materials have become the key materials necessary for defending against high-kinetic energy projectiles such as small-caliber armor-piercing bullets. At the same time, with the development of high-tech, fiber synthesis and spinning technology, high-performance fiber bulletproof materials have gradually emerged in the field of bulletproof, especially in the field of individual bulletproof, with important application prospects. Therefore, the protective layer in the existing bulletproof plug plate is mainly composed of supermolecular polyethylene sheets superimposed and ceramic material sheets interlaced. The protective strength of the protective layer of this structure is not high, and it is difficult to meet the relevant needs of protective equipment. At the same time, the width and tightness of the bulletproof plug plate are adjusted according to the height, shortness, fatness and thinness of the user's body shape, making the applicability of the bulletproof plug plate poor. The buckle connects the shoulder and waist of the bulletproof plug plate. When disassembling, the user needs to unlock the buckle one by one, which increases the operation steps and cannot achieve quick disassembly of the bulletproof plug plate. Tactical bulletproof plug plates should be flexibly disassembled.

[0005] At present, the existing bulletproof inserts have problems such as heavy weight, low protection strength and poor applicability. Especially when facing high kinetic energy projectiles, it is difficult to meet the protection needs. Summary of the invention

[0006] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a composite bulletproof insert and a preparation method thereof to solve the problems of the existing bulletproof insert being heavy, insufficient in protection strength, and difficult to prevent penetration by high kinetic energy projectiles.

[0007] The present invention is achieved through the following technical solutions: on the one hand, a composite bulletproof insert is provided, which includes a ceramic / titanium alloy plate and a UHMWPE plate bonded to each other; the ceramic / titanium alloy plate is sprayed with a certain thickness of titanium alloy and polyurea resin in sequence on two surface surfaces of the curved ceramic plate; and a crack-stop layer and an anti-dent layer are compounded in sequence along the surface of the polyurea resin.

[0008] Through the above technical scheme, the hybrid structure belongs to a lightweight porous structure, and its mechanical properties are excellent, but the single lightweight porous structure is slightly insufficient in terms of anti-ballistic penetration. Different materials can be filled into the pores of the hybrid structure to form a hybrid lightweight porous structure to improve the impact resistance of the overall structure. This is a lightweight sandwich structure that contains various materials (metal and non-metal) and involves a porous structure of various structural types filled with other materials. As for materials, metal materials include aluminum alloys and steel, and non-metallic materials are composed of non-metallic materials such as aramid fiber, ultra-high molecular weight polyethylene fiber, glass fiber GFRP, carbon fiber CFRP, and ceramics. Eliminating the factors of bulletproof of the above-mentioned many materials, the present invention designs a pyramid-shaped lattice sprayed boron carbide structure of mixed short-cut kevlar fiber polyurea resin and ceramic rods to carry out spherical projectile tests, and the test shows that its anti-ballistic performance is significantly improved. If polyurea and boron carbide ceramics are filled in the pyramid lattice structure, and a kevlar fiber layer is added between the back plate and the interlayer, the results show that the gain effect of ceramics is much greater than that of polyurea, and the addition of kevlar alone does not have a good gain effect. The impact response of the lattice structure in three cases of filling ceramic prisms and filling polyurea resin and ceramics shows that the lattice structure filled with polyurea resin and ceramic prisms has better performance; the research on the anti-penetration mechanism shows that the ballistic limit velocity can be improved compared with the homogeneous ceramic plate with equal surface density.

[0009] Therefore, the present invention solves the problem that the existing bulletproof insert plate is heavy and difficult to prevent penetration by 53-type 7.62mm incendiary bullets with an initial velocity of 880m / s, especially the US 6.8mm with an initial velocity of 934±10m / s, and even more difficult to prevent penetration by US 8.6mm high-kinetic energy projectiles with an initial velocity of 950±20m / s, and it is difficult to achieve the existing bulletproof effect.

[0010] Furthermore, the curved ceramic plate includes ceramic ribs, and a surface plate and a bottom plate connected by the ceramic ribs; the ceramic ribs, the surface plate and the bottom plate constitute a ceramic prism.

[0011] Preferably, the anti-concavity layer has a thickness of 1.5-3.0 mm.

[0012] Furthermore, the spraying thickness of the titanium alloy is 0.2-0.5 mm, and the spraying thickness of the polyurea resin is 0.1-0.6 mm.

[0013] Furthermore, the thickness of the ceramic / titanium alloy plate is 5.0-8.0 mm; the thickness of the UHMWPE plate is 9.0-16 mm.

[0014] Furthermore, the UHMWPE board is formed into a fiber mesh based on supramolecular polyethylene fibers through a non-woven process, the fiber mesh is impregnated with a Kevlar fiber cloth through an adhesive, and is vacuum hot-pressed in an autoclave; the thickness of the Kevlar fiber cloth is 2.0-4.5 mm, and the surface density of the Kevlar fiber cloth is 120-180 g / m 2 .

[0015] Furthermore, the number N of stacked layers of the Kevlar fiber cloth is 5-9.

[0016] A method for preparing the composite bulletproof insert is also provided, comprising the following steps:

[0017] Step S1, forming the curved ceramic plate;

[0018] The curved ceramic plate is made by mixing boron carbide powder and adhesive in a certain proportion, adding them into a curved mold, hot pressing them, and then sintering them under pressure.

[0019] Step S2, forming the ceramic / titanium alloy plate;

[0020] The curved ceramic plate obtained in step S1 is sprayed with a titanium alloy of a certain thickness at a temperature of 1720-1950° C. to obtain a ceramic / titanium alloy plate;

[0021] Step S3, spraying a certain thickness of polyurea resin on both sides of the ceramic / titanium alloy plate obtained in step S2 to obtain a ceramic / titanium alloy plate sprayed with polyurea resin on both sides;

[0022] Step S4, forming the UHMWPE plate;

[0023] The surface density is 80-136g / m 2 The UHMWPE sheet impregnated with water-soluble epoxy resin is laid flat on a cutting machine, and the fully automatic cutting machine is used to cut the sheets into the required size of the curved bulletproof insert, and the cut sheets are laid and weighed respectively to press the UHMWPE sheet and the kevlar fiber cloth to obtain the UHMWPE sheet;

[0024] Step S5, preparing the composite bulletproof insert plate;

[0025] The UHMWPE plate obtained in step S4 and the ceramic / titanium alloy plate with polyurea resin sprayed on both sides obtained in step S3 are compounded at a temperature of 135-155° C. and a pressure of 2.5-5.5 MPa, and then kept warm for 90-120 nm. After the compounding is completed, they are cooled to room temperature and removed. After the crack-stop layer and the anti-dent layer are respectively bonded to the polyurea resin layer, the surface is edge-sealed with waterproof cow tendon cloth to obtain a composite bulletproof insert.

[0026] Furthermore, in step S1, the curved ceramic plate is a trapezoidal multi-curved ceramic plate; and the sintering temperature is 2250-2450°C.

[0027] Further, in step S5, the weight of the composite bulletproof insert is 2530g. According to the ballistic test, a 53-type 7.62mm armor-piercing incendiary bullet was fired at 15 meters from the bulletproof plate with an initial velocity of 830-850m / s, and no penetration was achieved after three shots.

[0028] Beneficial Effects

[0029] The bulletproof plug plate of the present invention adopts a combination of a curved ceramic plate and a titanium alloy coating, which improves the protective strength and impact resistance. Among them, the trapezoidal multi-curved ceramic plate has the best protective strength and impact resistance. The superposition of the UHMWPE plate and the Kevlar fiber cloth further enhances the lightness and flexibility of the bulletproof plug plate. The addition of the polyurea buffer protective layer improves the impact resistance response and protective effect of the bulletproof plug plate.

[0030] The bulletproof insert plate of the present invention is firstly prepared by high-temperature spraying of titanium alloy on a sintered curved ceramic plate, and then spraying a layer of urea-formaldehyde resin, which has a significant improvement effect on the brittle cracking of the bulletproof layer. After segmented composite, it has excellent bulletproof performance and can effectively defend against penetration by high kinetic energy projectiles. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the composite bulletproof insert structure of the present invention;

[0032] Figure 2 It is a schematic diagram of the structure of the ceramic plate and the titanium alloy in the composite bulletproof insert of the present invention;

[0033] Figure 3 It is a schematic diagram of a boron carbide ceramic plate embodying a rib-shank structure of the present invention.

[0034] 1-boron carbide ceramic plate; 2-titanium alloy coating; 3-polyurea coating; 4-UHMWPE plate. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0036] like Figure 1 As shown, a titanium alloy material of a certain thickness is uniformly sprayed on both sides of the boron carbide ceramic plate 1 by high-temperature plasma melting, so that the anti-ballistic performance of the boron carbide ceramic plate is improved, and it has a reinforced dual-function bulletproof effect; the UD plate, also known as the UHMWPE plate, is a non-woven fabric made of supramolecular polyethylene fiber, which is superimposed on the Kevlar fiber cloth after being dipped in glue and vacuum hot-pressed in an autoclave as a close-fitting bulletproof layer.

[0037] like Figure 2 As shown, on the surface of the boron carbide ceramic plate of titanium alloy material uniformly sprayed by high-temperature plasma melting, a certain thickness of polyurea resin is sprayed on both sides to obtain a ceramic / titanium alloy plate sprayed with polyurea resin on both sides. The addition of the polyurea buffer protective layer can stop the cracking of the boron carbide ceramic plate when it is impacted by a projectile, thereby improving the impact resistance response and protective effect of the bulletproof insert.

[0038] like Figure 3 As shown, the boron carbide ceramic plate with a ribbed structure has a diameter of 2 mm to ensure that the boron carbide ceramic plate will not crack when impacted by a projectile, or the crack extension will affect the impact of the projectile again, ensuring that the boron carbide ceramic plate plays an effective bulletproof role when the second projectile is impacted.

[0039] 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. The experimental methods without specific conditions in the following examples are usually carried out under conventional conditions or according to the conditions recommended by the manufacturer. Unless otherwise specified, all percentages, ratios, proportions or parts are by weight.

[0040] Unless otherwise specified, the reagents and raw materials used in the examples and comparative examples of the present invention can be obtained through commercial channels.

[0041] Example 1

[0042] A method for preparing a composite bulletproof insert comprises the following steps:

[0043] Step S1, forming a curved ceramic plate;

[0044] 94.5wt% of boron carbide powder and 5.5wt% of adhesive were mixed in a mixing tank for 300 minutes until uniform, and then added into a trapezoidal multi-curved surface mold with ribs, and hot-pressed at 160°C and 5.5MPa for 12 minutes to form a trapezoidal multi-curved surface ceramic plate, and then sintered at 3.5MPa and 2320°C for 180 minutes to cool to room temperature for use;

[0045] Step S2, forming a ceramic / titanium alloy plate;

[0046] The boron carbide ceramic plate consists of a surface plate, a bottom plate and ceramic ribs, with a thickness of 6 mm; the surface plate and the bottom plate are separated by ceramic ribs (see Figure 3 ) connection, the ceramic ribs are divided into two arrangements, distributed on the front and back sides of the ceramic plate respectively, to strengthen the ceramic plate after impact; and the two ribs are combined with the surface plate and the bottom plate as pure ceramics to form a prism.

[0047] The surface plate of the ceramic plate is made of titanium alloy sprayed by high-temperature plasma melting on the basis of the bottom plate, with a spraying thickness of 0.8mm, so that it forms a reinforced composite material of ceramic and titanium alloy materials and matches the ceramic prism to achieve a protective effect; the trapezoidal ceramic / titanium alloy plate is 5.5mm and is matched with a 12mm thick trapezoidal UHMWPE plate as a gap, and 7 layers of Kevlar fiber cloth with a thickness of 2.6mm are added behind the UHMWPE plate. The trapezoidal multi-curved ceramic plate / titanium alloy plate is fixed with adhesive, and the trapezoidal multi-curved ceramic plate / titanium alloy plate and UHMWPE plate are bonded with adhesive.

[0048] The curved ceramic plate obtained in step S1 is plasma melt-sprayed with a titanium alloy with a thickness of 0.22 mm at 1726° C. to obtain a ceramic / titanium alloy composite ceramic plate;

[0049] Step S3, spraying 0.18 mm thick polyurea resin on both sides of the ceramic / titanium alloy plate obtained in step S2 to obtain a ceramic / titanium alloy composite plate with polyurea resin sprayed on both sides to prevent the ceramic from cracking after impact;

[0050] Step S4, forming the UHMWPE plate;

[0051] The surface density of Kevlar fiber cloth is 145g / m 2 , woven from yarn, dipped in glue for later use;

[0052] The surface density is 136g / m 2The UD cloth impregnated with water-soluble epoxy resin is laid flat on a cutting machine, and is cut into the required size of the curved bulletproof insert using a fully automatic cutting machine. The cut pieces are laid in 14 layers, 4 layers of Kevlar fiber cloth are added in the middle, and then weighed respectively to press the UHMWPE sheet to obtain the UHMWPE sheet with a thickness of 12.5 mm;

[0053] Step S5, preparing the composite bulletproof insert plate;

[0054] The UHMWPE plate (see Figure 1 ) and the ceramic / titanium alloy plate (see Figure 1 and Figure 2 ) Under the conditions of temperature of 138° C. and pressure of 3.2 MPa, the composite is carried out after heat preservation for 90 minutes. After the composite is completed, it is cooled to room temperature and removed. The crack-stop layer and the anti-dent layer are respectively bonded to the polyurea resin layer, and the surface is edge-sealed with waterproof cow tendon cloth to obtain a composite bullet-proof insert plate; the thickness is 22 mm and the weight is 2530 g.

[0055] After ballistic testing, the Type 53 7.62mm armor-piercing incendiary bullet failed to penetrate the bulletproof plate at a distance of 15 meters with an initial velocity of 830m / s, 834m / s, and 842m / s; the dents were 31.2mm, 28.4mm, and 26.6mm.

[0056] Example 2

[0057] A method for preparing a composite bulletproof insert comprises the following steps:

[0058] Step S1, forming a curved ceramic plate;

[0059] 94wt% of boron carbide powder and 6wt% of adhesive are mixed in a mixing tank for 240min until uniform, and then added into a trapezoidal multi-curved surface mold with ribs, and hot-pressed at 160°C and 5.5MPa for 12min to form a trapezoidal multi-curved surface ceramic plate, and then sintered at 3.5MPa and 2260°C for 240min, cooled to room temperature for use;

[0060] Step S2, forming a ceramic / titanium alloy plate;

[0061] The boron carbide ceramic plate consists of a surface plate, a bottom plate and ceramic ribs, with a thickness of 6.2 mm; the surface plate and the bottom plate are separated by ceramic ribs (see Figure 3 ) connection, the ceramic ribs are divided into two arrangements, distributed on the front and back sides of the ceramic plate respectively, to strengthen the ceramic plate after impact; and the two ribs are combined with the surface plate and the bottom plate as pure ceramics to form a prism.

[0062] The surface plate of the ceramic plate is sprayed with titanium alloy on both sides by high-temperature plasma melting on the basis of the bottom plate, and the spraying thickness is 0.6mm, so that it forms a reinforced composite material of ceramic and titanium alloy materials and matches the ceramic prism to achieve a protective effect; the trapezoidal ceramic / titanium alloy plate is 6.2mm and is gap-matched with a 12mm thick trapezoidal UHMWPE plate, and 7 layers of Kevlar fiber cloth with a thickness of 2.6mm are added behind the UHMWPE plate. The trapezoidal multi-curved ceramic plate / titanium alloy plate is fixed with an adhesive, and the trapezoidal multi-curved ceramic plate / titanium alloy plate and the UHMWPE plate are bonded with an adhesive.

[0063] The curved ceramic plate obtained in step S1 is plasma melt-sprayed with a titanium alloy with a thickness of 0.22 mm at 1850° C. to obtain a ceramic / titanium alloy composite ceramic plate with a total thickness of 6.64 mm;

[0064] Step S3, spraying 0.18 mm thick polyurea resin on both sides of the ceramic / titanium alloy plate obtained in step S2 to obtain a ceramic / titanium alloy composite plate with polyurea resin sprayed on both sides to prevent the ceramic from cracking after impact;

[0065] Step S4, forming the UHMWPE plate;

[0066] The surface density of Kevlar fiber cloth is 128g / m 2 , woven from yarn, dipped in glue for later use;

[0067] The surface density is 130g / m 2 The UD cloth impregnated with water-soluble epoxy resin is laid flat on a cutting machine, and is cut into the required size of the curved bulletproof insert using a fully automatic cutting machine. The cut pieces are laid in 12 layers with 6 layers of Kevlar fiber cloth added in the middle, and then weighed respectively. The UHMWPE plate with a thickness of 13.2 mm is obtained by heat preservation for 60 minutes in a vacuum tank at 134° C., a pressure of 2.6 MPa, and a vacuum degree of 0.015 MPa;

[0068] Step S5, preparation of a composite bulletproof insert;

[0069] The UHMWPE plate (see Figure 1 ) and the ceramic / titanium alloy plate (see Figure 1 and Figure 2 ) Under the conditions of temperature of 142° C. and pressure of 3.6 MPa, the composite is prepared after heat preservation for 120 minutes. After the composite is completed, it is cooled to room temperature and removed. The crack-stop layer and the anti-dent layer are respectively bonded to the polyurea resin layer, and the surface is edge-sealed with waterproof cow tendon cloth to obtain a composite bulletproof insert plate; the thickness is 21.96 mm and the weight is 2560 g.

[0070] After ballistic testing, the Type 53 7.62mm armor-piercing incendiary bullet failed to penetrate the bulletproof plate at a distance of 15 meters with initial velocities of 835m / s, 846m / s, and 852m / s; the dents were 26.2mm, 21.4mm, and 22.3mm.

[0071] Example 3

[0072] A method for preparing a composite bulletproof insert comprises the following steps:

[0073] Step S1, forming a curved ceramic plate;

[0074] 95.5wt% of boron carbide powder and 4.5wt% of adhesive were mixed in a mixing tank for 300 minutes until uniform, and then added into a trapezoidal multi-curved surface mold with ribs, and hot-pressed at 155°C and 5.8MPa for 15 minutes to form a trapezoidal multi-curved surface ceramic plate, and then sintered at 3.7MPa and 2160°C for 300 minutes, and cooled to room temperature for use;

[0075] Step S2, forming a ceramic / titanium alloy plate;

[0076] The boron carbide ceramic plate is composed of a surface plate, a bottom plate and ceramic ribs, with a thickness of 6.5 mm. The surface plate and the bottom plate are separated by ceramic ribs (see Figure 3 ) connection, the ceramic ribs are divided into two arrangements, distributed on the front and back sides of the ceramic plate respectively, to strengthen the ceramic plate after impact; and the two ribs are combined with the surface plate and the bottom plate as pure ceramics to form a prism.

[0077] The surface plate of the ceramic plate is made by high-temperature plasma melting and double-sided spraying of titanium alloy on the basis of the bottom plate, with a spraying thickness of 0.5mm, so that it forms a reinforced composite material of ceramic and titanium alloy materials and matches the ceramic prism to achieve a protective effect; the trapezoidal ceramic / titanium alloy plate is 7.0mm and is gap-matched with a 12mm thick trapezoidal UHMWPE plate, and 6 layers of Kevlar fiber cloth with a thickness of 2.5mm are added behind the UHMWPE plate. The trapezoidal multi-curved ceramic plate / titanium alloy plate is fixed with an adhesive, and the trapezoidal multi-curved ceramic plate / titanium alloy plate and the UHMWPE plate are bonded with an adhesive.

[0078] The curved ceramic plate obtained in step S1 is plasma melt-sprayed with a titanium alloy with a thickness of 0.25 mm at 1920° C. to obtain a ceramic / titanium alloy composite ceramic plate with a total thickness of 7.0 mm;

[0079] Step S3, spraying 0.20 mm thick polyurea resin on both sides of the ceramic / titanium alloy plate obtained in step S2 to obtain a ceramic / titanium alloy composite plate with polyurea resin sprayed on both sides to prevent the ceramic from cracking after impact;

[0080] Step S4, forming the UHMWPE plate;

[0081] The surface density of Kevlar fiber cloth is 128g / m 2 , woven from yarn, dipped in glue for later use;

[0082] The surface density is 130g / m 2 The UD cloth impregnated with water-soluble epoxy resin is laid flat on a cutting machine, and is cut into the required size of the curved bulletproof insert using a fully automatic cutting machine. The cut pieces are laid in 13 layers with 6 layers of Kevlar fiber cloth added in the middle, and then weighed respectively. The UHMWPE plate with a thickness of 13.6 mm is obtained by keeping the temperature in a vacuum tank at 142° C., a pressure of 2.6 MPa, and a vacuum degree of 0.020 MPa for 60 minutes;

[0083] Step S5, preparation of a composite bulletproof insert plate;

[0084] The UHMWPE plate (see Figure 1 ) and the ceramic / titanium alloy plate (see Figure 1 and Figure 2 ) Under the conditions of temperature of 145°C and pressure of 3.5MPa, the composite is carried out after heat preservation for 120min. After the composite is completed, it is cooled to room temperature and removed. The crack-stop layer and the anti-dent layer are respectively bonded to the polyurea resin layer, and the surface is edge-sealed with waterproof cow tendon cloth to obtain a composite bullet-proof insert plate; the thickness is 22.40mm and the weight is 2593g.

[0085] After ballistic testing, the Type 53 7.62mm armor-piercing incendiary bullet failed to penetrate the bulletproof plate at a distance of 15 meters with initial velocities of 835m / s, 846m / s, and 852m / s; the dents were 26.2mm, 21.4mm, and 22.3mm.

[0086] It was also tested with the Type 95 7.62mm armor-piercing incendiary bullet ballistics. At a distance of 15 meters from the bulletproof plate, six shots with initial velocities of 914m / s, 922m / s, 926m / s, 919m / s, and 929m / s failed to penetrate the plate. The dents were 18.6mm, 19.5mm, 20.2mm, 18.6mm, 17.7mm, and 20.4mm.

[0087] Example 4

[0088] A method for preparing a composite bulletproof insert comprises the following steps:

[0089] Step S1, forming a curved ceramic plate;

[0090] 96wt% of boron carbide powder and 4wt% of adhesive were mixed in a mixing tank for 320min until uniform, and then added into a trapezoidal multi-curved surface mold with ribs, and hot-pressed at 180°C and 6.2MPa for 16min to form a trapezoidal multi-curved surface ceramic plate, and then sintered at 3.5MPa and 2350°C for 360min and cooled to room temperature for use;

[0091] Step S2, forming a ceramic / titanium alloy plate;

[0092] The boron carbide ceramic plate consists of a surface plate, a bottom plate and ceramic ribs, with a thickness of 6.45 mm; the surface plate and the bottom plate are separated by ceramic ribs (see Figure 3 ) connection, the ceramic ribs are divided into two arrangements, distributed on the front and back sides of the ceramic plate respectively, to strengthen the ceramic plate after impact; and the two ribs are combined with the surface plate and the bottom plate as pure ceramics to form a prism.

[0093] The surface plate of the ceramic plate is sprayed with titanium alloy on both sides by high-temperature plasma melting on the basis of the bottom plate, and the spraying thickness is 0.5mm, so that it forms a reinforced composite material of ceramic and titanium alloy materials and matches the ceramic prism to achieve a protective effect; the trapezoidal ceramic / titanium alloy plate is 6.45mm and is gap-matched with a 12.5mm thick trapezoidal UHMWPE plate, and 8 layers of Kevlar fiber cloth with a thickness of 2.9mm are added behind the UHMWPE plate. The trapezoidal multi-curved ceramic plate / titanium alloy plate is fixed with an adhesive, and the trapezoidal multi-curved ceramic plate / titanium alloy plate and the UHMWPE plate are bonded with an adhesive.

[0094] The curved ceramic plate obtained in step S1 is plasma melt-sprayed with a titanium alloy with a thickness of 0.26 mm at 1920° C. to obtain a ceramic / titanium alloy composite ceramic plate with a total thickness of 6.71 mm;

[0095] Step S3, spraying 0.20 mm thick polyurea resin on both sides of the ceramic / titanium alloy plate obtained in step S2 to obtain a ceramic / titanium alloy composite plate with polyurea resin sprayed on both sides to prevent the ceramic from cracking after impact;

[0096] Step S4, forming the UHMWPE plate;

[0097] The surface density of Kevlar fiber cloth is 134g / m 2 , woven from yarn, dipped in glue for later use;

[0098] The surface density is 140g / m 2The UD cloth impregnated with water-soluble epoxy resin is laid flat on a cutting machine, and is cut into the required size of the curved bulletproof insert using a fully automatic cutting machine. The cut pieces are laid in 12 layers with 5 layers of Kevlar fiber cloth added in the middle, and then weighed respectively. The UHMWPE plate with a thickness of 14.3 mm is obtained by heat preservation for 90 minutes in a vacuum tank at 138° C., a pressure of 2.8 MPa, and a vacuum degree of 0.023 MPa;

[0099] Step S5, preparation of a composite bulletproof insert plate;

[0100] The UHMWPE plate (see Figure 1 ) and the ceramic / titanium alloy plate (see Figure 1 and Figure 2 ) Under the conditions of temperature of 142° C. and pressure of 3.6 MPa, the composite is carried out after heat preservation for 120 minutes. After the composite is completed, it is cooled to room temperature and removed. The crack-stop layer and the anti-dent layer are respectively bonded to the polyurea resin layer, and the surface is edge-sealed with waterproof cow tendon cloth to obtain a composite bullet-proof insert plate; the thickness is 21.41 mm and the weight is 2620 g.

[0101] Take five of the above bulletproof plates and test them with four types of weapons. The results are as follows:

[0102] After testing with the Type 53 7.62mm ballistic gun, three 7.62mm armor-piercing incendiary bullets with initial velocities of 837m / s, 845m / s and 853m / s failed to penetrate the bulletproof plate at a distance of 15 meters; the dents were 27.3mm, 22.5mm and 23.2mm.

[0103] After testing with the Type 56 7.62mm ballistic gun, three shots with 7.62mm armor-piercing bullets at a distance of 15 meters from the bulletproof plate with initial velocities of 717m / s, 729m / s, and 726m / s failed to penetrate the plate; the dents were 17.2mm, 18.3mm, and 19.2mm.

[0104] After testing with the Type 95 5.8mm ballistic gun, three shots with 5.8mm armor-piercing bullets at a distance of 15 meters from the bulletproof plate with initial velocities of 934m / s, 926m / s, and 922m / s failed to penetrate the plate; the dents were 19.2mm, 23.4mm, and 22.8mm.

[0105] After testing by the US 6.8mm ballistic gun, the armor-piercing bullets at a distance of 15 meters with initial velocities of 952m / s, 946m / s, and 938m / s failed to penetrate the bulletproof plate; the dents were 27.2mm, 26.4mm, and 25.3mm.

[0106] After testing with an American 8.6mm ballistic gun, using high-kinetic energy armor-piercing projectiles, at a distance of 15 meters from the bulletproof plate, the initial velocities were 960m / s, 968m / s, and 972m / s, and none of the three shots penetrated the plate; the dents were 31.2mm, 32.3mm, and 31.8mm.

[0107] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A composite bulletproof insert, characterized in that: The composite bulletproof insert plate comprises a ceramic / titanium alloy plate and a UHMWPE plate bonded to each other; the ceramic / titanium alloy plate is sprayed with a certain thickness of titanium alloy and polyurea resin in sequence on two surface surfaces of the curved ceramic plate; and a crack-stop layer and an anti-dent layer are compounded in sequence along the surface of the polyurea resin.

2. The composite bulletproof insert according to claim 1, characterized in that: The curved ceramic plate comprises ceramic ribs, and a surface plate and a bottom plate connected by the ceramic ribs; the ceramic ribs, the surface plate and the bottom plate form a ceramic prism.

3. The composite bulletproof insert according to claim 1, characterized in that: The thickness of the anti-concavity layer is 1.5-3.0 mm.

4. The composite bulletproof insert according to claim 1, characterized in that: The spraying thickness of the titanium alloy is 0.2-0.5 mm, and the spraying thickness of the polyurea resin is 0.1-0.6 mm.

5. The composite bulletproof insert according to claim 1, characterized in that: The thickness of the ceramic / titanium alloy plate is 5.0-8.0 mm; the thickness of the UHMWPE plate is 9.0-16 mm.

6. The composite bulletproof insert according to claim 1, characterized in that: The UHMWPE board is formed into a fiber net based on supramolecular polyethylene fibers through a non-woven process. The fiber net is impregnated with glue and then laminated with Kevlar fiber cloth through an adhesive, and then vacuum hot-pressed in an autoclave; the thickness of the Kevlar fiber cloth is 2.0-4.5 mm, and the surface density of the Kevlar fiber cloth is 120-180 g / m 2 .

7. The composite bulletproof insert according to claim 6, characterized in that: The number N of stacked layers of the Kevlar fiber cloth is 5-9.

8. A method for preparing the composite bulletproof insert according to any one of claims 1 to 7, characterized in that: The following steps are involved: Step S1, forming the curved ceramic plate; The curved ceramic plate is made by mixing boron carbide powder and adhesive in a certain proportion, adding them into a curved mold, hot pressing them, and then sintering them under pressure. Step S2, forming the ceramic / titanium alloy plate; The curved ceramic plate obtained in step S1 is sprayed with a titanium alloy of a certain thickness at a temperature of 1720-1950° C. to obtain a ceramic / titanium alloy plate; Step S3, spraying a certain thickness of polyurea resin on both sides of the ceramic / titanium alloy plate obtained in step S2 to obtain a ceramic / titanium alloy plate sprayed with polyurea resin on both sides; Step S4, forming the UHMWPE plate; The surface density is 80-136g / m 2 The UHMWPE sheet impregnated with water-soluble epoxy resin is laid flat on a cutting machine, and the fully automatic cutting machine is used to cut the sheets into the required size of the curved bulletproof insert, and the cut sheets are laid and weighed respectively to press the UHMWPE sheet and the kevlar fiber cloth to obtain the UHMWPE sheet; Step S5, preparing the composite bulletproof insert plate; The UHMWPE plate obtained in step S4 and the ceramic / titanium alloy plate with polyurea resin sprayed on both sides obtained in step S3 are compounded at a temperature of 135-155° C. and a pressure of 2.5-5.5 MPa, and then kept warm for 90-120 nm. After the compounding is completed, they are cooled to room temperature and removed. After the crack-stop layer and the anti-dent layer are respectively bonded to the polyurea resin layer, the surface is edge-sealed with waterproof cow tendon cloth to obtain a composite bulletproof insert.

9. The method for preparing a composite bulletproof insert according to claim 8, characterized in that: In step S1, the curved ceramic plate is a trapezoidal multi-curved ceramic plate; and the sintering temperature is 2250-2450°C.

10. The method for preparing a composite bulletproof insert according to claim 8, characterized in that: In step S5, the weight of the composite bulletproof insert is 2530g. According to the ballistic test, a 53-type 7.62mm armor-piercing incendiary bullet was fired at 15 meters from the bulletproof plate with an initial velocity of 830-850m / s, and no penetration was achieved after three shots.

Images