A titanium alloy, aramid composite lightweight protective plate and preparation method thereof

Abstract

The present invention discloses a titanium alloy and aramid lightweight composite protective plate, comprising alternately distributed titanium alloy plates and aramid plates, wherein the total number of layers of the titanium alloy plates and aramid plates is 3 to 7 layers, and the outermost layer of the protective plate is a titanium alloy plate. In addition, the present invention also provides a method for preparing the titanium alloy and aramid lightweight composite protective plate, wherein the titanium alloy plates and aramid plates are coated with an adhesive and then stacked, and then cured at room temperature and high pressure to obtain a composite protective plate. The present invention adopts a multi-layer composite reinforcement method of titanium alloy and aramid, and by designing the thickness of different materials layer by layer, the advantages of the linear ultra-high strength of the aramid material and the high specific strength of the titanium alloy material are maximized in the ability to resist projectile penetration, and the surface density of the protective plate is greatly reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of composite materials, and specifically relates to a titanium alloy and aramid composite lightweight protective plate and a preparation method thereof. Background Art

[0002] Aramid is a fiber material with ultra-high linear strength, which can be used in various flexible protective equipment such as bulletproof vests after weaving. However, since it is an organic material, its stiffness and temperature adaptability are poor, making it difficult to use it independently as a structural protection material.

[0003] As a new generation of armor structural materials, titanium alloy has the advantages of low density, high specific strength, and corrosion resistance. However, the low density of titanium alloy is only relative to traditional steel, and as a metal material, it is still heavy. When used in light protective shelters such as barracks and cabins that require manual assembly, it is difficult to achieve rapid assembly and replacement during use, which cannot meet application requirements.

[0004] Therefore, a titanium alloy and aramid composite lightweight protective plate and a preparation method thereof are needed. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a titanium alloy and aramid composite lightweight protective plate in view of the deficiencies of the above-mentioned prior art. The titanium alloy and aramid composite lightweight protective plate adopts a multi-layer composite reinforcement method, and through the thickness design of different materials layer by layer, the advantages of the linear ultra-high strength of the aramid material and the high specific strength of the titanium alloy material are maximized in the ability to resist the penetration of projectiles, thereby obtaining a titanium alloy and aramid composite lightweight protective plate with excellent performance.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: a titanium alloy and aramid composite lightweight protective plate, characterized in that the protective plate comprises titanium alloy plates and aramid plates that are alternately distributed, the total number of layers of the titanium alloy plates and aramid plates is 3 to 7 layers, and the outermost layer of the protective plate is a titanium alloy plate. The present invention can alternately produce the effects of ballistic direction deflection and projectile energy absorption during the projectile penetration process by compounding multiple layers of titanium alloy and multiple layers of aramid plates, significantly increase the actual path of the projectile trajectory, and improve the anti-ballistic performance of the protective plate.

[0007] The above-mentioned titanium alloy and aramid composite lightweight protective plate is characterized in that the material of the titanium alloy plate is one or more of TC4 titanium alloy, TA15 titanium alloy and TC21 titanium alloy; the thickness of the titanium alloy plate is 2mm to 4mm; the number of layers of the titanium alloy plate is 2 to 4 layers; the total thickness of each layer of the titanium alloy plate is 6mm to 12mm. The main function of the titanium alloy plate in the composite plate of the present invention is to deflect the ballistic path of the penetrating projectile. A titanium alloy plate that is too thin will be directly penetrated and will not produce any effect. A titanium alloy plate that is too thick will also have a straightening effect on the ballistic path at the disadvantage of increasing the overall weight of the composite plate. Therefore, the appropriate thickness of the titanium alloy plate is of great significance to the anti-ballistic effect and low-density effect of the composite plate of the present invention. A titanium alloy plate with a single-layer thickness of 2mm to 4mm can provide the best ballistic deflection effect and will not straighten the trajectory. The composite plate of the present invention can design different composite structures according to the target of protecting projectiles. Under the target of the lowest surface density of the composite plate: the composite plate structure for protecting 7.62mm caliber ordinary bullets is at least 3 layers, of which the titanium alloy plates are at least 2 layers, and the total thickness is at least 6mm; the composite plate structure for protecting 7.62mm caliber armor-piercing incendiary bullets is at least 7 layers, of which the titanium alloy plates are at least 4 layers, and the total thickness is at least 12mm.

[0008] The above-mentioned titanium alloy and aramid composite lightweight protective plate is characterized in that the aramid plate is a plate prepared by stacking and curing aramid non-woven cloth composed of aramid fibers, and the directional angle between each layer of the aramid non-woven cloth when stacked is 0°~90°; the thickness of the aramid plate is 8mm~12mm; the number of layers of the aramid plate is 1 layer to 3 layers; the total thickness of each layer of the aramid plate is 8mm~24mm. Aramid non-woven fabric is woven from two layers of parallel aramid fibers, which can transmit and disperse impact force along the fiber direction to the maximum extent. When preparing protective aramid plates, the direction between each layer of aramid cloth also has a significant impact on the anti-ballistic performance of the entire plate. Therefore, the composite plate designed by the present invention can select the intersection angle of each layer of aramid plates between 0° and 90° according to specific needs when preparing the aramid plate. The aramid plate in the composite plate of the present invention mainly functions to absorb and transmit the kinetic energy of the projectile when it penetrates. When the projectile passes through an aramid plate that is too thin, the kinetic energy has not been significantly reduced and it contacts the next layer of titanium alloy plate, resulting in a small kinetic energy difference between the two layers of titanium alloy plates, affecting the subsequent ballistic path deflection effect. An aramid plate that is too thick continues to reduce the kinetic energy in one direction. , the titanium alloy plate cannot play the ballistic deflection effect in time and increase the overall thickness of the composite plate. Therefore, the appropriate thickness of the aramid plate is of great significance to the anti-ballistic effect and low-density effect of the composite plate of the present invention. The aramid plate with a single-layer thickness of 8mm to 12mm can provide sufficient kinetic energy absorption effect without making the dosage too large. The composite plate of the present invention can design different composite structures according to the target of protecting projectiles. Under the target of the lowest surface density of the composite plate: the composite plate structure for protecting 7.62mm caliber ordinary bullets is at least 3 layers, of which the aramid plate is at least 1 layer, and the total thickness is at least 8mm; the composite plate structure for protecting 7.62mm caliber armor-piercing incendiary bullets is at least 7 layers, of which the aramid plate is at least 3 layers, and the total thickness is at least 24mm.

[0009] The titanium alloy and aramid composite lightweight protective plate is characterized in that an adhesive is provided between the titanium alloy plate and the aramid plate, and the overlapping shear strength of the adhesive at room temperature is greater than 2000 psi. The present invention uses the adhesive to firmly combine the titanium alloy plate and the aramid plate to form a titanium alloy and aramid composite lightweight protective plate.

[0010] In addition, the present invention also provides a method for preparing a titanium alloy and aramid composite lightweight protective plate, characterized in that the method comprises the following steps:

[0011] Step 1, preparing a titanium alloy plate and an aramid plate respectively;

[0012] Step 2: alternately stack the titanium alloy plates and aramid plates prepared in step 1 and evenly apply adhesive between them to obtain a composite plate blank;

[0013] Step 3: Wrap the composite board blank obtained in step 2 with kraft paper and put it into a press to perform high-pressure curing at room temperature to obtain a composite protective plate.

[0014] Compared with the prior art, the present invention has the following advantages:

[0015] 1. The present invention adopts a multi-layer composite reinforcement method. By designing the thickness of different materials layer by layer, the advantages of the linear ultra-high strength of aramid materials and the high specific strength of titanium alloy materials are maximized in the ability to resist projectile penetration, thereby obtaining a titanium alloy and aramid composite lightweight protective plate with excellent performance.

[0016] 2. In the multi-layer structure design of the present invention, the titanium alloy plate serves as the projectile-facing surface, which can first resist the impact of the sharp penetration of the projectile, and at the same time absorb the detonation effect when hit by the armor-piercing incendiary bomb and other explosive projectiles. Then, the aramid plate serving as the interlayer will have a deflection effect on the penetration direction of the projectile. The titanium alloy plate attached in the middle can support the flexible aramid plate and expand the deflection effect. The titanium alloy plate serving as the back plate provides overall support and protection performance.

[0017] 3. Compared with the use of titanium alloy materials alone, the multi-layer composite titanium alloy plates and aramid plates designed in the present invention greatly reduce the overall surface density at the same protection level, and can meet the requirements of lightweight high-strength protective plates. The aramid material used as a multi-layer interlayer can effectively reduce heat conduction while providing anti-ballistic performance, thereby improving the thermal insulation performance of the composite protective plate.

[0018] 4. The present invention can adjust the composite structure scheme according to the protection requirements, and can resist the penetration of multiple 7.62mm armor-piercing incendiary bullets at a distance of 100 meters, an incident angle of 0°, and a bullet speed of 870m / s, and 7.62mm ordinary bullets at a distance of 100 meters, an incident angle of 0°, and a bullet speed of 870m / s.

[0019] 5. The present invention solves the contradiction between protection and weight in the prior art. The protective plate is composed of a titanium alloy plate and an aramid plate in a multi-layer composite structure design. The front panel and the back panel are both made of titanium alloy plates. It can take advantage of the stability of titanium alloy to the external environment, and effectively achieve protection against projectile penetration by selecting a suitable number of layers and matching the appropriate thickness of each layer of plate material. At the same time, it has a low surface density, which greatly reduces the overall weight of the protective plate.

[0020] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the structure of the composite protective plate prepared in Example 1 of the present invention.

[0022] Figure 2This is a schematic diagram of the structure of the composite protective plate prepared in Example 2 of the present invention.

[0023] Figure 3 This is a schematic diagram of the structure of the composite protective plate prepared in Example 3 of the present invention.

[0024] Figure 4 This is a schematic diagram of the structure of the composite protective plate prepared in Example 4 of the present invention.

[0025] Description of reference numerals:

[0026] 1—titanium alloy plate; 2—aramid plate; 3—aramid plate. DETAILED DESCRIPTION

[0027] Example 1

[0028] This embodiment includes the following steps:

[0029] Step 1, prepare a titanium alloy plate and an aramid plate respectively; the process of preparing the titanium alloy plate is as follows: prepare TC4 alloy plates with a thickness of 4 mm and 2 mm respectively by hot rolling, then flatten and alkaline pickling the surface, then keep warm at 800°C for 1h for annealing, and then cut into titanium alloy plates with a length × width of 400 mm × 400 mm; the process of preparing the aramid plate is as follows: cut the aramid non-woven fabric into 32 pieces of aramid non-woven fabric pieces with a length × width of 400 mm × 400 mm, then stack the aramid non-woven fabric pieces layer by layer with a directional angle of 90° between each layer, put the stacked aramid non-woven fabric pieces into a mold and then load it into a vacuum hot pressing equipment, evacuate and heat and pressurize, heat to 155°C at a pressure of 30MPa and keep warm for 60min to obtain an aramid plate with a thickness of 8 mm;

[0030] Step 2: Place the titanium alloy plate and aramid plate prepared in step 1 on the bottom surface according to the thickness of the titanium alloy plate of 4 mm, and then apply DP190 epoxy resin adhesive in sequence and stack 8 mm thick aramid plate, 2 mm thick titanium alloy plate, 8 mm thick aramid plate, 2 mm thick titanium alloy plate, 8 mm thick aramid plate, and 4 mm thick titanium alloy plate to obtain a composite plate blank; wherein the amount of adhesive used for each layer is 40 mL / m 2 ~60mL / m 2 ;

[0031] Step 3: Wrap the composite board blank obtained in step 2 with kraft paper and put it into a press, and cure it at room temperature under a pressure of 100 kg for 24 hours to obtain a composite protective plate.

[0032] Figure 1 This is a schematic diagram of the structure of the composite protective plate prepared in this embodiment. Figure 1It can be seen that the total number of layers of the composite protective plate prepared in this embodiment is 7 layers, the thickness of the titanium alloy plate 1 is 2 mm and 4 mm respectively, the 4 mm thick titanium alloy plate 1 is at the top and bottom layers, the total thickness of the titanium alloy plate 1 is 12 mm, the thickness of the aramid plate 2 is 8 mm, the total thickness of the aramid plate 2 is 24 mm, and an adhesive 3 is arranged between the titanium alloy plate 1 and the aramid plate 2.

[0033] After testing, the surface density of the titanium alloy-aramid composite protective plate prepared in this embodiment is less than 77kg / m 2 After the target test with 4 7.62mm armor-piercing incendiary bullets (100 meters away, incident angle 0°, bullet speed 870m / s), there was no perforation and no bulge on the back.

[0034] Example 2

[0035] This embodiment includes the following steps:

[0036] Step 1, prepare a titanium alloy plate and an aramid plate respectively; the process of preparing the titanium alloy plate is as follows: prepare TC4 alloy plates with a thickness of 4 mm and 2 mm respectively by hot rolling, then flatten and alkaline pickling the surface, then keep warm at 800°C for 1h for annealing, and then cut into titanium alloy plates with a length × width of 400 mm × 400 mm; the process of preparing the aramid plate is as follows: cut the aramid non-woven fabric into 32 pieces of aramid non-woven fabric pieces with a length × width of 400 mm × 400 mm, then stack the aramid non-woven fabric pieces layer by layer with a directional angle of 90° between each layer, put the stacked aramid non-woven fabric pieces into a mold and then load it into a vacuum hot pressing equipment, evacuate and heat and pressurize, heat to 155°C at a pressure of 30MPa and keep warm for 60min to obtain an aramid plate with a thickness of 8 mm;

[0037] Step 2: Place the titanium alloy plate and aramid plate prepared in step 1 on the bottom surface according to the thickness of the titanium alloy plate of 2 mm, and then apply DP190 epoxy resin adhesive in turn and stack the aramid plate of 8 mm and the titanium alloy plate of 4 mm to obtain a composite plate blank; wherein the amount of adhesive used for each layer is 40 mL / m 2 ~60mL / m 2 ;

[0038] Step 3: Wrap the composite board blank obtained in step 2 with kraft paper and put it into a press, and cure it at room temperature under a pressure of 100 kg for 24 hours to obtain a composite protective plate.

[0039] Figure 2 This is a schematic diagram of the structure of the composite protective plate prepared in this embodiment. Figure 2It can be seen that the total number of layers of the composite protective plate prepared in this embodiment is 3 layers, the thickness of the titanium alloy plate 1 is 2 mm and 4 mm respectively, the total thickness of the titanium alloy plate 1 is 6 mm, the thickness of the aramid plate 2 is 8 mm, the total thickness of the aramid plate 2 is 8 mm, and an adhesive 3 is arranged between the titanium alloy plate 1 and the aramid plate 2.

[0040] After testing, the surface density of the titanium alloy-aramid composite protective plate prepared in this embodiment is less than 35kg / m 2 After the target test with 4 rounds of 7.62mm ordinary bullets (100 meters distance, incident angle 0°, bullet speed 870m / s), there was no perforation and no bulge on the back.

[0041] Example 3

[0042] This embodiment includes the following steps:

[0043] Step 1, prepare a titanium alloy plate and an aramid plate respectively; the process of preparing the titanium alloy plate is as follows: prepare a 3 mm thick plate by hot rolling the TA15 alloy, then level and then alkaline pickle the surface, then keep it at 800°C for 1h for annealing, and then cut it into a titanium alloy plate with a length × width of 400mm × 400mm; the process of preparing the aramid plate is as follows: cut the aramid non-weft cloth into 40 pieces of aramid non-weft cloth pieces with a length × width of 400mm × 400mm, then stack the aramid non-weft cloth pieces layer by layer with the direction angle between each layer being 0°, put the stacked aramid non-weft cloth pieces into the mold and then load it into the vacuum hot pressing equipment, evacuate and then heat and pressurize, heat to 155°C at a pressure of 30MPa and keep it for 60min to obtain an aramid plate with a thickness of 10mm;

[0044] Step 2: Place the titanium alloy plate and aramid plate prepared in step 1 on the bottom surface according to the thickness of the titanium alloy plate, and then apply DP190 epoxy resin adhesive in sequence and stack a 10mm thick aramid plate, a 3mm thick titanium alloy plate, a 10mm thick aramid plate, and a 3mm thick titanium alloy plate to obtain a composite plate blank; wherein the amount of adhesive used for each layer is 40mL / m 2 ~60mL / m 2 ;

[0045] Step 3: Wrap the composite board blank obtained in step 2 with kraft paper and put it into a press, and cure it at room temperature under a pressure of 100 kg for 24 hours to obtain a composite protective plate.

[0046] Figure 3 This is a schematic diagram of the structure of the composite protective plate prepared in this embodiment. Figure 3It can be seen that the total number of layers of the composite protective plate prepared in this embodiment is 5 layers, the thickness of the titanium alloy plate 1 is 3 mm, the total thickness of the titanium alloy plate 1 is 9 mm, the thickness of the aramid plate 2 is 10 mm, the total thickness of the aramid plate 2 is 20 mm, and an adhesive 3 is provided between the titanium alloy plate 1 and the aramid plate 2.

[0047] After testing, the surface density of the titanium alloy-aramid composite protective plate prepared in this embodiment is less than 77kg / m 2 After the target test with 4 7.62mm armor-piercing incendiary bullets (100 meters away, incident angle 0°, bullet speed 870m / s), there was no perforation and no bulge on the back.

[0048] Example 4

[0049] This embodiment includes the following steps:

[0050] Step 1, prepare a titanium alloy plate and an aramid plate respectively; the process of preparing the titanium alloy plate is as follows: prepare the TC21 alloy with a thickness of 4 mm and 3 mm by hot rolling, then flatten and alkaline pickling the surface, then keep it at 800°C for 1h for annealing, and then cut it into a titanium alloy plate with a length × width of 400 mm × 400 mm; the process of preparing the aramid plate is as follows: cut the aramid non-woven fabric into 48 pieces of aramid non-woven fabric with a length × width of 400 mm × 400 mm, then stack the aramid non-woven fabric pieces layer by layer with a directional angle of 90° between each layer, put the stacked aramid non-woven fabric pieces into a mold and then load it into a vacuum hot pressing equipment, evacuate the vacuum, increase the temperature and pressurize, heat to 155°C at a pressure of 30 MPa, and keep it for 60 minutes to obtain an aramid plate with a thickness of 12 mm;

[0051] Step 2: Place the titanium alloy plate and aramid plate prepared in step 1 on the bottom surface according to the thickness of the titanium alloy plate of 3 mm, and then apply DP190 epoxy resin adhesive in sequence and stack the aramid plate of 12 mm, the titanium alloy plate of 2 mm, the aramid plate of 12 mm, and the titanium alloy plate of 3 mm to obtain a composite plate blank; wherein the amount of adhesive used for each layer is 40 mL / m 2 ~60mL / m 2 ;

[0052] Step 3: Wrap the composite board blank obtained in step 2 with kraft paper and put it into a press, and cure it at room temperature under a pressure of 100 kg for 24 hours to obtain a composite protective plate.

[0053] Figure 4 This is a schematic diagram of the structure of the composite protective plate prepared in this embodiment. Figure 4It can be seen that the total number of layers of the composite protective plate prepared in this embodiment is 5 layers, the thickness of the titanium alloy plate 1 is 3 mm and 2 mm, the 3 mm thick titanium alloy plate 1 is at the top and bottom layers, the total thickness of the titanium alloy plate 1 is 8 mm, the thickness of the aramid plate 2 is 12 mm, the total thickness of the aramid plate 2 is 24 mm, and an adhesive 3 is provided between the titanium alloy plate 1 and the aramid plate 2.

[0054] After testing, the surface density of the titanium alloy-aramid composite protective plate prepared in this embodiment is less than 77kg / m 2 After the target test with 4 7.62mm armor-piercing incendiary bullets (100 meters away, incident angle 0°, bullet speed 870m / s), there was no perforation and no bulge on the back.

[0055] The above is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent change made to the above embodiment according to the technical essence of the invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A titanium alloy and aramid composite lightweight protective plate, characterized in that: The protective plate comprises titanium alloy plates and aramid plates which are alternately distributed, the total number of layers of the titanium alloy plates and the aramid plates is 3 to 7 layers, the outermost layer of the protective plate is the titanium alloy plate; the thickness of the titanium alloy plate is 2 mm to 4 mm; the number of layers of the titanium alloy plate is 2 to 4 layers; the total thickness of each layer of the titanium alloy plate is 6 mm to 12 mm; the thickness of the aramid plate is 8 mm to 12 mm; the number of layers of the aramid plate is 1 to 3 layers; the total thickness of each layer of the aramid plate is 8 mm to 24 mm; The method for preparing the titanium alloy and aramid composite lightweight protective plate comprises the following steps: Step 1, preparing a titanium alloy plate and an aramid plate respectively; Step 2: alternately stack the titanium alloy plates and aramid plates prepared in step 1 and evenly apply adhesive between them to obtain a composite plate blank; Step 3: Wrap the composite board blank obtained in step 2 with kraft paper and put it into a press to perform high pressure curing at room temperature to obtain a composite protective plate; The protective plate can resist the penetration of multiple 7.62mm armor-piercing incendiary bullets at a distance of 100 meters, an incident angle of 0°, and a bullet speed of 870m / s, and 7.62mm ordinary bullets at a distance of 100 meters, an incident angle of 0°, and a bullet speed of 870m / s.

2. The titanium alloy and aramid composite lightweight protective plate according to claim 1, characterized in that: The material of the titanium alloy plate is one or more of TC4 titanium alloy, TA15 titanium alloy and TC21 titanium alloy.

3. The titanium alloy and aramid composite lightweight protective plate according to claim 1, characterized in that: The aramid board is a board prepared by stacking and curing aramid non-woven fabrics composed of aramid fibers, and the direction angle between each layer of the stacked aramid non-woven fabrics is 0° to 90°.

4. The titanium alloy and aramid composite lightweight protective plate according to claim 1, characterized in that: An adhesive is arranged between the titanium alloy plate and the aramid plate, and the overlapping shear strength of the adhesive at room temperature is greater than 2000 psi.

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