A preparation method of an energetic micro-projectile warhead driven by propellant

Abstract

Through the reasonable proportioning of various substances, the present invention prepares the energetic microprojectile A from conventional metal powders such as aluminum powder, tungsten powder and magnesium powder, and polytetrafluoroethylene powder. The formulation and preparation process of the new propellant are determined, and the new propellant B is prepared through processes such as powder mixing, sol preparation, shaping, and drying. The energetic microprojectile A is filled and sealed in a matching manner with the housing C filled with the new propellant to obtain the energetic microprojectile warhead D driven by the new propellant. The present invention proposes a design of an energetic microprojectile warhead driven by a new propellant. In this design, the energetic microprojectile has the characteristics of high activity, high toughness, and high safety. As a new type of damage element, compared with single inert or active fragments of the same mass, the damage effect is greatly enhanced. The new propellant is different from traditional propellants and has advantages such as high energy and insensitivity. Finally, the microprojectile forms coupled damage effects such as kinetic energy penetration, chemical explosion, and high-temperature combustion.

Description

Technical Field

[0001] The present invention relates to a preparation method of an energetic micro-projectile warhead driven by propellant, belonging to the fields of energetic materials and active fragment materials. Background Art

[0002] Facing the significant characteristics of the complexity, uncertainty, and target diversity of the urban combat environment, the realistic demands of "accurate destruction, severe destruction, and ingenious destruction" are becoming increasingly urgent. Typical targets in urban combat include aircraft, motor vehicles, etc. Aircraft targets are mostly low-altitude and low-speed aircraft such as helicopters. The flight altitude of helicopters is generally between 1000 and 2000 meters, and the cruising speed is between 200 and 240 kilometers per hour. Vehicles are common wheeled vehicles, often used for command and combat, transporting troops and combat supplies. In urban combat, for such common military and civilian targets, heavy air firepower and long-range firepower are difficult to exert the advantage of precise strikes. Dense buildings limit the line of sight and field of fire, which is not conducive to real-time and accurate situation reconnaissance and continuous and stable fire shooting. The streets are narrow, and large armored vehicles are inconvenient to maneuver and are vulnerable to anti-tank weapons, with relatively high risks. Military targets and non-military targets are closely connected, and it is extremely easy to cause collateral damage to non-military targets when destroying military targets. It can be seen that traditional damage means have major technical bottlenecks in terms of damage patterns, damage capabilities, damage efficiencies, etc., seriously restricting the development of urban combat damage technology and the improvement of combat effectiveness.

[0003] In view of the above problems, the demand for weapons that are suitable for the urban combat environment, have low costs, rapid responses, good strike effects, and low collateral damage is extremely urgent. Summary of the Invention

[0004] The purpose of the present invention is to provide a new method for countering typical targets in urban combat, and propose a preparation method of an energetic micro-projectile warhead driven by propellant. The killing of helicopters belongs to the penetration explosion and penetration arson modes, and the damage to vehicles mainly includes penetration arson. This method mainly includes the design and preparation of energetic micro-projectiles and new propellants. A preparation method of an energetic micro-projectile warhead driven by propellant proposed by the present invention. In this design, the energetic micro-projectiles have the characteristics of high activity, high toughness, and high safety. As a new type of damage element, compared with single inert or active fragments of the same mass, the damage effect is greatly enhanced. The new propellant is prepared by mixing fluoropolymer and metal, which has the advantages of high energy and insensitivity compared with traditional propellants. Finally, the micro-projectiles are driven by the new propellant to achieve the integration of launch and damage, forming coupled damage effects such as kinetic energy penetration, chemical explosion, and high-temperature combustion. The energetic micro-projectile warhead driven by this new propellant has a reasonable overall structure, wide sources of raw materials, and high cost-effectiveness, and can achieve multi-dimensional and wide-area effective damage to urban combat targets. It has potential application prospects in the field of countering typical targets in urban combat.

[0005] The object of the present invention is achieved by the following technical solutions. A preparation method of an energetic micro-projectile warhead driven by propellant, the specific steps are as follows:

[0006] Step 1: Explore and determine the reasonable ratio of each substance, and prepare energetic micro-projectiles through processes such as powder mixing, molding, sintering, and fixing. Among them, Al is 10%, Mg is 10%, PTFE is 30%, and W is 50%. Finally, energetic micro-projectile A is obtained, with a density of 3.9 g / cm 3 ;

[0007] Step 2: Explore and determine the formula and preparation process of the new propellant. Among them, Mg is 20%, Al is 15%, polytetrafluoroethylene (PTFE) is 35%, fluororubber (F2311) is 15%, and silane coupling agent (KH550) is 15%. Prepare propellant B through processes such as powder mixing, sol preparation, shaping, and drying;

[0008] Step 3: Load propellant B into the cartridge case C of a 14.5 mm or 12.7 mm anti-materiel sniper rifle;

[0009] Step 4: Perform matching loading and sealing treatment on energetic micro-projectile A and the cartridge case C filled with the new propellant to obtain the final energetic micro-projectile warhead D driven by the new propellant.

[0010] Beneficial effects

[0011] 1. A preparation method of an energetic micro-projectile warhead driven by propellant, which uses conventional metal powders and polytetrafluoroethylene powders through processes such as powder mixing, molding, sintering, and shaping. The process is simple, has no special process requirements, low cost, and is convenient for mass production.

[0012] 2. The preparation method of an energetic micro-projectile warhead driven by propellant proposed by the present invention. Compared with the single inert fragments reported in the past, the projectile fragments of this invention are active fragments prepared from active materials. The entire energetic micro-projectile warhead driven by the new propellant has the advantages of rapid reaction, strong flexibility, low cost performance, high efficiency and safety compared with conventional countermeasure weapons. Description of the drawings

[0013] Figure 1 is the temperature curve graph during the sintering of the energetic micro-projectile in Example 1;

[0014] Figure 2 is the photo of the energetic micro-projectile prepared in Example 1;

[0015] Figure 3 is the photo of the new propellant prepared;

[0016] Figure 4It is the structural diagram of the cartridge cases of 12.7mm and 14.5mm anti-materiel sniper rifles;

[0017] Figure 5 It is the diagram of the energetic micro-projectile warhead driven by a new type of propellant;

[0018] Figure 6 It is the photo of the comprehensive damage effect of the energetic micro-projectiles prepared in Example 1 hitting a 6mm Q235A steel plate + 2mm LY12 aluminum plate vertically at an initial velocity of 1000m / s. Specific implementation manners

[0019] The present invention will be further described below in conjunction with the embodiments and the accompanying drawings.

[0020] Example 1

[0021] A preparation method of an energetic micro-projectile warhead driven by a propellant, the specific steps are as follows:

[0022] (1) Prepare energetic micro-projectile fragments.

[0023] Mixing powders: The mass ratio of each component is: aluminum powder / magnesium powder / polytetrafluoroethylene / tungsten powder = 10 / 10 / 30 / 50, that is, weigh 10g of aluminum powder, 10g of magnesium powder, 30g of polytetrafluoroethylene powder, and 50g of tungsten powder, dry them, and place them in an all-round planetary ball mill to mix for 2h, with a rotation speed of 200rpm / min, and mix evenly;

[0024] Molding: Add the above-mentioned evenly mixed powder into a special molding die for pre-pressing, with a pressure of 30MPa, a pressure application rate set at 30N / s, a pressure holding time of 5min, a pressure relief rate set at 30N / s, and demold after the pressure relief is completed to obtain the molded micro-projectiles;

[0025] Sintering: Place the demolded micro-projectiles in a sintering furnace for sintering. During the sintering process, use an argon atmosphere, heat up to 380°C at a heating rate of 1°C / min, hold for 2h, cool down to 327°C at a cooling rate of 1°C / min, hold for 2h, and then cool with the furnace to room temperature to obtain single energetic micro-projectile energetic fragments, as shown in the appendix Figure 2 shown;

[0026] (2) Prepare propellant B.

[0027] Mixing powders: The mass ratio of each component is magnesium powder / aluminum powder / polytetrafluoroethylene / fluororubber (2311) / silane coupling agent (KH550) = 20 / 15 / 35 / 15 / 15, that is, accurately weigh 20g of magnesium powder, 15g of aluminum powder, 35g of polytetrafluoroethylene powder, dry them, and place them in an all-round planetary ball mill to mix for 2h, with a rotation speed of 200rpm / min, and mix evenly;

[0028] Sol: Accurately weigh 15 g of fluororubber and dissolve it in petroleum ether for standby;

[0029] Dilution: Dilute the silane coupling agent with a mixed solution of isopropanol / deionized water = 9:1 for standby;

[0030] Shaping: Uniformly add the dissolved fluororubber to the metal / polytetrafluoroethylene powder. After an interval of 2 min, spray the diluted silane coupling agent. During this period, ensure that the materials are stirred evenly;

[0031] Drying: Place the shaped mixed powder in a vacuum oven for drying to finally obtain a new type of propellant, as shown in the appendix Figure 3 as follows;

[0032] (3) Assemble to obtain a warhead driven by a new type of propellant for an energetic micro-projectile.

[0033] Perform matching loading and sealing treatment on the energetic micro-projectile and the casing filled with the new type of propellant to finally obtain a warhead driven by the new type of propellant for an energetic micro-projectile.

[0034] In this embodiment, the density of the energetic micro-projectile used to prepare the warhead driven by the new type of propellant is 3.9 g / cm 3 , the single mass is 0.08 g, the combustion calorific value is 10179.9 J / g, the yield strength under quasi-static conditions is 23.07 MPa, the elastic modulus is 801.493 MPa, the hardening modulus is 16.93 Mpa, and the detonation heat of the new type of propellant is about 8730 J / g. The photo of the comprehensive damage effect of vertically impacting a 6 mm Q235A steel plate + 2 mm LY12 aluminum plate at an initial velocity of 1000 m / s is as shown in the appendix Figure 6 as follows.

[0035] The above specific description further details the purpose, technical solution, and beneficial effects of the invention. It should be understood that the above is only a specific embodiment of the present invention and is not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A preparation method for an energetic micro-projectile warhead driven by propellant, the specific steps are as follows: Step 1: Explore and determine the reasonable ratio of each substance, and prepare the energetic microprojectile A through the processes of powder mixing, molding, sintering, and fixation. Among them, The mass ratio of each component is that aluminum powder is 10%, magnesium powder is 10%, polytetrafluoroethylene powder is 30%, and tungsten powder is 50%. Finally, the energetic micro-projectile A is obtained, with a density of 3.9 g / cm 3 ; Step 2: Mixing powders: The mass ratios of each component are 20% magnesium powder, 15% aluminum powder, 35% polytetrafluoroethylene powder, 15% fluororubber, and 15% silane coupling agent. That is, accurately weigh 20 g of magnesium powder, 15 g of aluminum powder, and 35 g of polytetrafluoroethylene powder, dry them, place them in an all-round planetary ball mill and mix for 2 h at a rotation speed of 200 rpm / min until evenly mixed; Sol preparation: Dissolve accurately weighed 15 g of fluororubber in petroleum ether for standby; Dilution: Dilute the silane coupling agent with a mixed solution of isopropanol: deionized water = 9:1 for standby; Shaping: Uniformly add the dissolved fluororubber to the magnesium powder, aluminum powder, and polytetrafluoroethylene powder, and spray the silane coupling agent diluent after an interval of 2 min. During this period, ensure that the materials are stirred evenly; Drying: Place the shaped mixed powder in a vacuum oven for drying to finally obtain propellant B; Step 3: Load propellant B into a 14.5 mm or 12.7 mm anti-materiel sniper rifle bullet casing C; Step 4: Perform matching loading and sealing treatment on the energetic micro-projectile A and the casing C loaded with propellant B to obtain the final energetic micro-projectile warhead D driven by propellant B.

2. The preparation method of an energetic micro-projectile warhead driven by propellant according to claim 1, characterized in that: The energetic micro-projectile A described in Step 1 is an active fragment.

3. The preparation method of an energetic micro-projectile warhead driven by propellant according to claim 1, characterized in that: The 14.5 mm or 12.7 mm anti-materiel sniper rifle bullet casing C described in Step 3 is a standard casing.

Images