Gradient metal powder and paraffin mixture and preparation method thereof

Abstract

The invention discloses a gradient metal powder and paraffin mixture and a preparation method thereof, and belongs to the technical field of non-lethal ammunition. The gradient metal powder and paraffin mixture comprises the following components in parts by mass: 99-101 parts of first metal powder, 59-61 parts of second metal powder, 221-223 parts of third metal powder and 70 parts of paraffin. The preparation method comprises the steps that a liquid first metal powder and paraffin mixture, a liquid second metal powder and paraffin mixture and a liquid third metal powder and paraffin mixture are prepared according to the proportion; wherein the densities of the first metal powder, the second metal powder and the third metal powder are sequentially reduced; the third metal powder and paraffin mixture contains 50 parts of paraffin, and the other two metal powder and paraffin mixtures respectively contain 10 parts of paraffin. And the three kinds of metal powder and paraffin mixtures are stacked and solidified in sequence, gradient metal powder and paraffin mixtures are obtained, and the second metal powder and paraffin mixture is located in the middle layer.

Description

Technical Field

[0001] The present invention belongs to the technical field of non-lethal ammunition, and particularly relates to a gradient metal powder and paraffin mixture and a preparation method thereof. Background Art

[0002] In the technical field of non-lethal ammunition, with the continuous change of the demand for social security maintenance, higher requirements are put forward for the performance of non-lethal ammunition. Traditional non-lethal ammunition has some limitations in use and is difficult to balance the strike effect and safety in different scenarios.

[0003] Currently, the filling materials of non-lethal ammunition are mostly single metal powder or multiple metal powders die-cast. They cannot adapt to complex and diverse usage scenarios. Non-lethal ammunition made of single metal powder die-cast has insufficient power in scenarios that require strong deterrence; while in scenarios with high safety requirements, such as quickly breaking doors and locks at close range, it may cause unnecessary harm due to excessive impact force. Although non-lethal ammunition made of multiple metal powders mixed and die-cast has improved performance to a certain extent, due to the lack of scientific design in the composition distribution, it is difficult to accurately control the strike force and the scope of action. Summary of the Invention

[0004] To solve the above technical problems, the present invention proposes a gradient metal powder and paraffin mixture and a preparation method thereof. The gradient metal powder and paraffin mixture can quickly and efficiently damage targets such as anti-theft door locks, wooden door locks, and window guards, can withstand a launch impact speed of 400 m / s without automatic cracking, and can quickly crack into fine metal powders and fragments after hitting the target, without the risk of rebound.

[0005] The present invention proposes a preparation method of a gradient metal powder and paraffin mixture, and the gradient metal powder and paraffin mixture is filled in a cartridge case;

[0006] The preparation method includes:

[0007] Step S1, respectively prepare a liquid first metal powder and paraffin mixture, a liquid second metal powder and paraffin mixture, and a liquid third metal powder and paraffin mixture;

[0008] Wherein, by mass fraction, the first metal powder and paraffin mixture includes 99 - 101 parts of the first metal powder and 10 parts of paraffin, the second metal powder and paraffin mixture includes 59 - 61 parts of the second metal powder and 10 parts of paraffin, and the third metal powder and paraffin mixture includes 221 - 223 parts of the third metal powder and 50 parts of paraffin; the densities of the first metal powder, the second metal powder, and the third metal powder decrease in sequence;

[0009] Step S2: Pour 54 - 56 parts by mass of the liquid first metal powder and paraffin mixture into the cavity of the mold. After curing and forming, a solid first metal powder and paraffin mixture is obtained. Pour 34 - 36 parts by mass of the liquid second metal powder and paraffin mixture above the solid first metal powder and paraffin mixture. After curing and forming, a solid second metal powder and paraffin mixture is obtained. Pour 135 - 137 parts by mass of the third metal powder and paraffin mixture above the solid second metal powder and paraffin mixture. After curing and forming, cover the top cover of the mold and continue to cure for at least 5 h.

[0010] Step S3: Remove the mold to obtain the gradient metal powder and paraffin mixture.

[0011] According to the preparation method described in the first aspect of the present invention, in the step S1, the mass ratio of the first metal powder to paraffin in the first metal powder and paraffin mixture is 10:1.

[0012] According to the preparation method described in the first aspect of the present invention, in the step S1, the mass ratio of the second metal powder to paraffin in the second metal powder and paraffin mixture is 6:1.

[0013] According to the preparation method described in the first aspect of the present invention, in the step S1, the mass ratio of the third metal powder to paraffin in the third metal powder and paraffin mixture is 4.44:1.

[0014] According to the preparation method described in the first aspect of the present invention, in the step S1, the particle sizes of the first metal powder, the second metal powder, and the third metal powder are all not greater than 50 μm.

[0015] According to the preparation method described in the first aspect of the present invention, in the step S1, the first metal powder is a tungsten alloy powder;

[0016] The second metal powder is a lead alloy powder;

[0017] The third metal powder is an iron alloy powder.

[0018] According to the preparation method described in the first aspect of the present invention, in the step S1, the preparation processes of the liquid first metal powder and paraffin mixture, the liquid second metal powder and paraffin mixture, and the liquid third metal powder and paraffin mixture are as follows:

[0019] Step S11: Weigh the metal powder and solid paraffin according to the ratio.

[0020] Step S12: Heat the solid paraffin to 85 °C ± 2 °C to melt it to obtain liquid paraffin.

[0021] Step S13: Pour liquid paraffin into the corresponding metal powders according to the ratios respectively and stir evenly to obtain a liquid mixture of the first metal powder and paraffin, a liquid mixture of the second metal powder and paraffin, and a liquid mixture of the third metal powder and paraffin.

[0022] According to the preparation method described in the first aspect of the present invention, in the step S2, the temperature for curing and forming is room temperature, and the time is not less than 2 h.

[0023] The second aspect of the present invention provides a gradient metal powder and paraffin mixture prepared by using the foregoing preparation method. The gradient metal powder and paraffin mixture, by mass ratio, includes: 99 - 101 parts of the first metal powder, 59 - 61 parts of the second metal powder, 221 - 223 parts of the third metal powder, and 70 parts of paraffin.

[0024] According to the gradient metal powder and paraffin mixture described in the second aspect of the present invention, the gradient metal powder and paraffin mixture, by mass ratio, includes: 100 parts of tungsten alloy powder, 60 parts of lead alloy powder, 222 parts of ferroalloy powder, and 70 parts of paraffin.

[0025] The solution proposed by the present invention has the following technical effects:

[0026] On the one hand, in the present invention, by strictly controlling the ratios of metal powders with different densities and paraffin and the stacking positions between different metal powder and paraffin mixtures, the internal weight of the finally formed metal powder and paraffin mixture changes in a gradient manner. When in use, the end with the metal powder of greater density is close to the bottom of the bullet, and the function of the bullet head to damage anti-theft door locks, wooden door locks, window guards, etc. can be realized. On the other hand, using paraffin as the binder enables it to withstand the launch impact speed of 400 m / s without automatic cracking, and can quickly crack into fine metal powders and fragments after hitting the target, without the risk of rebound.

[0027] In addition, the gradient metal powder and paraffin mixture prepared by the present invention can be used with gunpowder, high-pressure gas, etc. as the power source.

[0028] In addition, the internal structure of the gradient metal powder and paraffin mixture prepared by the present invention is uniform, and the porosity of the three metal powder and paraffin mixtures is not greater than 0.1%; there are no obvious defects such as cracks and delamination on the surface, and the fracture strength is not less than 5 MPa. Description of the Drawings

[0029] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0030] Figure 1 Schematic diagram of the structure of the gradient metal powder and paraffin mixture prepared in an embodiment of the present invention.

[0031] Figure 2 Photo of the gradient metal powder and paraffin mixture prepared in Specific Embodiment 1 of the present invention.

[0032] Figure 3 Axial sectional view of the gradient metal powder and paraffin mixture prepared in Specific Embodiment 1 of the present invention. Specific Embodiments

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings. Obviously, the described embodiments are only some, rather than all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0034] The objective of this embodiment is to prepare a gradient metal powder and paraffin mixture, and its schematic diagram is as Figure 1 shown.

[0035] In the first aspect of this embodiment, a preparation method of a gradient metal powder and paraffin mixture is proposed. The gradient metal powder and paraffin mixture is filled in a cartridge case. When in use, the end with the denser metal powder is close to the bottom of the cartridge.

[0036] The preparation method includes:

[0037] Step S1, respectively prepare a liquid mixture of the first metal powder and paraffin, a liquid mixture of the second metal powder and paraffin, and a liquid mixture of the third metal powder and paraffin.

[0038] Among them, by mass fraction, the mixture of the first metal powder and paraffin includes 99 - 101 parts of the first metal powder and 10 parts of paraffin, the mixture of the second metal powder and paraffin includes 59 - 61 parts of the second metal powder and 10 parts of paraffin, and the mixture of the third metal powder and paraffin includes 221 - 223 parts of the third metal powder and 50 parts of paraffin; the densities of the first metal powder, the second metal powder, and the third metal powder decrease in sequence.

[0039] Step S2, by mass fraction, pour 54 - 56 parts of the liquid first metal powder and paraffin mixture into the cavity of the mold. After curing and forming, obtain the solid first metal powder and paraffin mixture; pour 34 - 36 parts of the liquid second metal powder and paraffin mixture above the solid first metal powder and paraffin mixture. After curing and forming, obtain the solid second metal powder and paraffin mixture; pour 135 - 137 parts of the third metal powder and paraffin mixture above the solid second metal powder and paraffin mixture. After curing and forming, cover the top cover of the mold and continue to cure for at least 5 h.

[0040] Step S3, remove the mold to obtain the gradient metal powder and paraffin mixture.

[0041] In this embodiment, on the one hand, by strictly controlling the ratio of metal powders with different densities and paraffin, as well as the stacking positions between different metal powder and paraffin mixtures (i.e., stacking the metal powders with gradually decreasing density from bottom to top to form a density gradient), the internal weight of the finally formed metal powder and paraffin mixture changes in a gradient manner. When in use, with the end of the metal powder with a large density close to the bottom of the bullet, it can achieve the function of the bullet head damaging anti-theft door locks, wooden door locks, window guards, etc. On the other hand, using paraffin as an adhesive enables it to withstand a launch impact velocity of 400 m / s without automatic cracking, and can quickly crack into fine metal powders and fragments after hitting the target, without the risk of rebound.

[0042] In addition, the gradient metal powder and paraffin mixture in this embodiment has been optimized for energy transfer and distribution gradient design, that is: through the metal powders with gradually decreasing density, a gradient energy transfer can be formed when the bullet head hits the target. The low-density metal powder is mainly used for damaging iron sheet or wooden initial media; the high-density metal powder is located at the bottom and is used to provide a strong impact force when hitting the lock tongue to quickly destroy the target.

[0043] In addition, within the limited space of the cartridge case, the volume is fixed. In this embodiment, the dosages of metal powder and paraffin mixtures with different densities are calculated according to the mass and velocity of the projectile under the action of the maximum chamber pressure. Under the condition of a fixed volume and maximum mass, according to the energy distribution, the dosages of three metal powders with different densities are determined. The dosage selection of paraffin needs to simultaneously ensure that the mixture does not crack in the cartridge case and is easy to crack after hitting the target. Through a large number of experimental studies and verifications in this embodiment, the dosage ratios of metal powders and paraffin with different densities, as well as the dosage ratios between metal powder and paraffin mixtures with different densities, are obtained.

[0044] In some embodiments, in the step S1, the mass ratio of the first metal powder to paraffin in the first metal powder and paraffin mixture is 10:1.

[0045] In some embodiments, in the step S1, the mass ratio of the second metal powder to paraffin in the second metal powder and paraffin mixture is 6:1.

[0046] In some embodiments, in the step S1, the mass ratio of the third metal powder to paraffin in the third metal powder and paraffin mixture is 4.44:1.

[0047] In some embodiments, in the step S1, the particle sizes of the first metal powder, the second metal powder, and the third metal powder are all not greater than 50 μm, so as to ensure that the metal powder and fragments generated by the cracking of the mixture after hitting the target will not cause fatal harm to the human body.

[0048] In some embodiments, in the step S1, the first metal powder is a tungsten alloy powder;

[0049] The second metal powder is a lead alloy powder;

[0050] The third metal powder is an iron alloy powder.

[0051] In some embodiments, in the step S1, the preparation processes of the liquid first metal powder and paraffin mixture, the liquid second metal powder and paraffin mixture, and the liquid third metal powder and paraffin mixture are as follows:

[0052] Step S11, Weigh the metal powder and solid paraffin according to the ratio.

[0053] Step S12, Heat the solid paraffin to 85°C ± 2°C for melting to ensure that the solid paraffin is fully melted to obtain liquid paraffin.

[0054] Step S13, Pour the liquid paraffin into the corresponding metal powder according to the ratio and stir evenly to obtain the liquid first metal powder and paraffin mixture, the liquid second metal powder and paraffin mixture, and the liquid third metal powder and paraffin mixture.

[0055] Preferably, before the step S2, cut the solid paraffin into particles of 2 mm × 2 mm × 2 mm to shorten the melting time.

[0056] In some embodiments, in the step S2, the curing and forming temperature is room temperature and the time is not less than 2 h to ensure that the liquid metal powder and paraffin mixture is fully cured into a solid metal powder and paraffin mixture.

[0057] In the second aspect of this embodiment, a gradient metal powder and paraffin mixture prepared by using the aforementioned preparation method is proposed. The gradient metal powder and paraffin mixture, by mass ratio, includes: 99 - 101 parts of the first metal powder, 59 - 61 parts of the second metal powder, 221 - 223 parts of the third metal powder, and 70 parts of paraffin.

[0058] In some embodiments, the gradient metal powder and paraffin mixture, by mass ratio, includes: 100 parts of tungsten alloy powder, 60 parts of lead alloy powder, 222 parts of ferroalloy powder, and 70 parts of paraffin. Specific Example 1

[0060] (1) Preparation of tungsten alloy powder and paraffin mixture: By mass fraction, take 100 parts of tungsten alloy powder and 10 parts of paraffin, wherein the particle size of the tungsten alloy powder is not greater than 50 μm. Cut the solid paraffin into particles of 2 mm × 2 mm × 2 mm and put them into a container, and heat it to 85 °C for melting; after the paraffin is completely melted into a liquid, pour in the tungsten alloy powder and stir evenly. Among them, when the tungsten alloy powder is 5 g, the paraffin is 0.5 g; when the tungsten alloy powder is 2.5 g, the paraffin is 0.25 g; when the tungsten alloy powder is 10 g, the paraffin is 1 g.

[0061] (2) Preparation of lead alloy powder and paraffin mixture: By mass fraction, take 60 parts of lead alloy powder and 10 parts of paraffin, wherein the particle size of the lead alloy powder is not greater than 50 μm. Cut the solid paraffin into particles of 2 mm × 2 mm × 2 mm and put them into a container, and heat it to 85 °C for melting; after the paraffin is completely melted into a liquid, pour in the lead alloy powder and stir evenly. Among them, when the lead alloy powder is 3 g, the paraffin is 0.5 g; when the lead alloy powder is 1.5 g, the paraffin is 0.25 g; when the lead alloy powder is 6 g, the paraffin is 1 g.

[0062] (3) Preparation of ferroalloy powder and paraffin mixture: By mass fraction, take 222 parts of ferroalloy powder and 50 parts of paraffin, and require that the particle size of the ferroalloy powder is not greater than 50 μm. Cut the solid paraffin into particles of 2 mm × 2 mm × 2 mm and put them into a container, and heat it to 85 °C for melting; after the paraffin is completely melted into a liquid, pour in the ferroalloy powder and stir evenly. Among them, when the ferroalloy powder is 11.1 g, the paraffin is 2.5 g; when the ferroalloy powder is 5.55 g, the paraffin is 1.25 g; when the ferroalloy powder is 22.2 g, the paraffin is 5.0 g.

[0063] (4) By mass fraction, pour 55 parts of the liquid tungsten alloy powder and paraffin mixture into the cavity of the mold. After curing at room temperature and standing for no less than 2 h, a solid tungsten alloy powder and paraffin mixture is obtained. Pour 35 parts of the liquid lead alloy powder and paraffin mixture above the solid tungsten alloy powder and paraffin mixture. After curing at room temperature and standing for no less than 2 h, a solid lead alloy powder and paraffin mixture is obtained. Pour 136 parts of the ferroalloy powder and paraffin mixture above the solid lead alloy powder and paraffin mixture. After curing at room temperature and standing for no less than 2 h, cover the top cover of the mold and continue to cure for at least 5 h.

[0064] Among them, when the amount of the liquid tungsten alloy powder and paraffin mixture is 5.5 g, the amount of the liquid lead alloy powder and paraffin mixture is 3.5 g, and the amount of the liquid ferroalloy powder and paraffin mixture is 13.6 g; when the amount of the liquid tungsten alloy powder and paraffin mixture is 2.75 g, the amount of the liquid lead alloy powder and paraffin mixture is 1.75 g, and the amount of the liquid ferroalloy powder and paraffin mixture is 6.8 g; when the amount of the liquid tungsten alloy powder and paraffin mixture is 11.0 g, the amount of the liquid lead alloy powder and paraffin mixture is 7.0 g, and the amount of the liquid ferroalloy powder and paraffin mixture is 27.2 g.

[0065] (5) Demold to obtain the gradient metal powder and paraffin mixture.

[0066] Figure 2 The photograph of the gradient metal powder and paraffin mixture prepared in Specific Example 1 is shown. Figure 3 It is the axial sectional view of the gradient metal powder and paraffin mixture prepared in Specific Example 1 (the right side of the picture is the high-density metal and paraffin mixture). From Figure 2 and Figure 3 It can be seen that there are no obvious defects such as cracks and delamination on its surface, and the internal structure is uniform. This defect-free appearance feature and uniform internal structure indicate that during the preparation process, each component of the mixture (including metal powders with different densities and paraffin) is evenly mixed together, and the structural stability is maintained during the molding process. This uniformity and stability are crucial for the performance of the mixture in practical applications because it can ensure that when the mixture is launched and impacts the target, it can quickly crack into fine metal powders and fragments according to the design requirements, thereby achieving an efficient barrier-breaking effect and avoiding performance degradation or safety risks caused by structural defects.

[0067] After testing, the porosity of the gradient metal powder and paraffin mixture prepared in Specific Example 1 is not greater than 0.1%, and the fracture strength is not less than 5 MPa. Specific Example 2

[0069] (1) Preparation of tungsten alloy powder and paraffin mixture: By mass fraction, take 99 parts of tungsten alloy powder and 10 parts of paraffin. Among them, the particle size of the tungsten alloy powder is not more than 50 μm. Cut the solid paraffin into particles of 2 mm × 2 mm × 2 mm and put them into a container, and heat it to 83 °C for melting; after the paraffin is completely melted into a liquid, pour in the tungsten alloy powder and stir evenly. Among them, when the tungsten alloy powder is 4.95 g, the paraffin is 0.5 g; when the tungsten alloy powder is 2.475 g, the paraffin is 0.25 g; when the tungsten alloy powder is 9.9 g, the paraffin is 1 g.

[0070] (2) Preparation of lead alloy powder and paraffin mixture: By mass fraction, take 59 parts of lead alloy powder and 10 parts of paraffin. Among them, the particle size of the lead alloy powder is not more than 50 μm. Cut the solid paraffin into particles of 2 mm × 2 mm × 2 mm and put them into a container, and heat it to 83 °C for melting; after the paraffin is completely melted into a liquid, pour in the lead alloy powder and stir evenly. Among them, when the lead alloy powder is 2.95 g, the paraffin is 0.5 g; when the lead alloy powder is 1.475 g, the paraffin is 0.25 g; when the lead alloy powder is 5.9 g, the paraffin is 1 g.

[0071] (3) Preparation of iron alloy powder and paraffin mixture: By mass fraction, take 221 parts of iron alloy powder and 50 parts of paraffin. It is required that the particle size of the iron alloy powder is not more than 50 μm. Cut the solid paraffin into particles of 2 mm × 2 mm × 2 mm and put them into a container, and heat it to 83 °C for melting; after the paraffin is completely melted into a liquid, pour in the iron alloy powder and stir evenly. Among them, when the iron alloy powder is 11.05 g, the paraffin is 2.5 g; when the iron alloy powder is 5.525 g, the paraffin is 1.25 g; when the iron alloy powder is 22.1 g, the paraffin is 5.0 g.

[0072] (4) By mass fraction, pour 54 parts of the liquid tungsten alloy powder and paraffin mixture into the cavity of the mold. After curing at room temperature and standing for not less than 2 h, a solid tungsten alloy powder and paraffin mixture is obtained; pour 34 parts of the liquid lead alloy powder and paraffin mixture above the solid tungsten alloy powder and paraffin mixture. After curing at room temperature and standing for not less than 2 h, a solid lead alloy powder and paraffin mixture is obtained; pour 135 parts of the iron alloy powder and paraffin mixture above the solid lead alloy powder and paraffin mixture. After curing at room temperature and standing for not less than 2 h, cover the top cover of the mold and continue to cure for at least 5 h.

[0073] Among them, when the dosage of the liquid tungsten alloy powder and paraffin mixture is 5.4 g, the dosage of the liquid lead alloy powder and paraffin mixture is 3.4 g, and the dosage of the liquid ferroalloy powder and paraffin mixture is 13.5 g; when the dosage of the liquid tungsten alloy powder and paraffin mixture is 2.7 g, the dosage of the liquid lead alloy powder and paraffin mixture is 1.7 g, and the dosage of the liquid ferroalloy powder and paraffin mixture is 6.75 g; when the dosage of the liquid tungsten alloy powder and paraffin mixture is 10.8 g, the dosage of the liquid lead alloy powder and paraffin mixture is 6.8 g, and the dosage of the liquid ferroalloy powder and paraffin mixture is 27.0 g.

[0074] (5) Demold the mold to obtain the gradient metal powder and paraffin mixture. Specific Example 3

[0076] (1) Preparation of tungsten alloy powder and paraffin mixture: By mass fraction, take 101 parts of tungsten alloy powder and 10 parts of paraffin, where the particle size of the tungsten alloy powder is not greater than 50 μm. Cut the solid paraffin into particles of 2 mm × 2 mm × 2 mm and put them into a container, and heat to 87 °C for melting; after the paraffin is completely melted into a liquid, pour in the tungsten alloy powder and stir evenly. Among them, when the tungsten alloy powder is 5.05 g, the paraffin is 0.5 g; when the tungsten alloy powder is 2.525 g, the paraffin is 0.25 g; when the tungsten alloy powder is 10.1 g, the paraffin is 1 g.

[0077] (2) Preparation of lead alloy powder and paraffin mixture: By mass fraction, take 61 parts of lead alloy powder and 10 parts of paraffin, where the particle size of the lead alloy powder is not greater than 50 μm. Cut the solid paraffin into particles of 2 mm × 2 mm × 2 mm and put them into a container, and heat to 87 °C for melting; after the paraffin is completely melted into a liquid, pour in the lead alloy powder and stir evenly. Among them, when the lead alloy powder is 3.05 g, the paraffin is 0.5 g; when the lead alloy powder is 1.525 g, the paraffin is 0.25 g; when the lead alloy powder is 6.1 g, the paraffin is 1 g.

[0078] (3) Preparation of ferroalloy powder and paraffin mixture: By mass fraction, take 223 parts of ferroalloy powder and 50 parts of paraffin, and require that the particle size of the ferroalloy powder is not greater than 50 μm. Cut the solid paraffin into particles of 2 mm × 2 mm × 2 mm and put them into a container, and heat to 87 °C for melting; after the paraffin is completely melted into a liquid, pour in the ferroalloy powder and stir evenly. Among them, when the ferroalloy powder is 11.15 g, the paraffin is 2.5 g; when the ferroalloy powder is 5.575 g, the paraffin is 1.25 g; when the ferroalloy powder is 22.3 g, the paraffin is 5.0 g.

[0079] (4) Pour 56 parts by mass of the liquid tungsten alloy powder and paraffin mixture into the cavity of the mold. After curing at room temperature and standing for not less than 2 h, a solid tungsten alloy powder and paraffin mixture is obtained; pour 36 parts of the liquid lead alloy powder and paraffin mixture onto the solid tungsten alloy powder and paraffin mixture. After curing at room temperature and standing for not less than 2 h, a solid lead alloy powder and paraffin mixture is obtained; pour 137 parts of the ferroalloy powder and paraffin mixture onto the solid lead alloy powder and paraffin mixture. After curing at room temperature and standing for not less than 2 h, cover the top cover of the mold and continue to cure for at least 5 h.

[0080] Among them, when the dosage of the liquid tungsten alloy powder and paraffin mixture is 5.6 g, the dosage of the liquid lead alloy powder and paraffin mixture is 3.6 g, and the dosage of the liquid ferroalloy powder and paraffin mixture is 13.7 g; when the dosage of the liquid tungsten alloy powder and paraffin mixture is 2.8 g, the dosage of the liquid lead alloy powder and paraffin mixture is 1.8 g, and the dosage of the liquid ferroalloy powder and paraffin mixture is 6.85 g; when the dosage of the liquid tungsten alloy powder and paraffin mixture is 11.2 g, the dosage of the liquid lead alloy powder and paraffin mixture is 7.2 g, and the dosage of the liquid ferroalloy powder and paraffin mixture is 27.4 g.

[0081] (5) Remove the mold to obtain the gradient metal powder and paraffin mixture.

[0082] In summary, the solution proposed by the present invention has the following technical effects:

[0083] On the one hand, in the present invention, by strictly controlling the ratio of metal powders with different densities and paraffin and the stacking positions between different metal powder and paraffin mixtures, the internal weight of the finally formed metal powder and paraffin mixture changes in a gradient manner. When in use, placing the end with the metal powder of greater density near the bottom of the bullet can achieve the function of damaging anti-theft door locks, wooden door locks, window guards and other targets; on the other hand, using paraffin as an adhesive enables it to withstand a launch impact speed of 400 m / s without automatic cracking and can quickly crack into fine metal powders and fragments after hitting the target, without the risk of rebound.

[0084] In addition, the gradient metal powder and paraffin mixture prepared by the present invention can be used with gunpowder, high-pressure gas, etc. as the power source.

[0085] In addition, the internal structure of the gradient metal powder and paraffin mixture prepared by the present invention is uniform, and the porosity of the three metal powder and paraffin mixtures is not greater than 0.1%; there are no obvious cracks, delamination and other defects on the surface, and the fracture strength is not less than 5 MPa.

[0086] Please note that the technical features of the above embodiments can be combined arbitrarily. For the sake of brevity in description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as within the scope described in this specification. The above embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A preparation method of a gradient metal powder and paraffin mixture, characterized in that, The gradient metal powder and paraffin mixture is filled in the cartridge case; The preparation method includes: Step S1, respectively prepare a liquid first metal powder and paraffin mixture, a liquid second metal powder and paraffin mixture, and a liquid third metal powder and paraffin mixture; Among them, by mass fraction, the first metal powder and paraffin mixture includes 99 - 101 parts of the first metal powder and 10 parts of paraffin, the second metal powder and paraffin mixture includes 59 - 61 parts of the second metal powder and 10 parts of paraffin, and the third metal powder and paraffin mixture includes 221 - 223 parts of the third metal powder and 50 parts of paraffin; the densities of the first metal powder, the second metal powder, and the third metal powder decrease in sequence; Step S2, by mass fraction, pour 54 - 56 parts of the liquid first metal powder and paraffin mixture into the cavity of the mold, and after solidification and molding, obtain a solid first metal powder and paraffin mixture; pour 34 - 36 parts of the liquid second metal powder and paraffin mixture above the solid first metal powder and paraffin mixture, and after solidification and molding, obtain a solid second metal powder and paraffin mixture; pour 135 - 137 parts of the third metal powder and paraffin mixture above the solid second metal powder and paraffin mixture, and after solidification and molding, cover the top cover of the mold, and continue to solidify for at least 5 h; Step S3, remove the mold to obtain the gradient metal powder and paraffin mixture.

2. The preparation method according to claim 1, characterized in that, In the step S1, the mass ratio of the first metal powder to paraffin in the first metal powder and paraffin mixture is 10:

1.

3. The preparation method according to claim 1, wherein In the step S1, the mass ratio of the second metal powder to paraffin in the second metal powder and paraffin mixture is 6:

1.

4. The preparation method according to claim 1, wherein, In the step S1, the mass ratio of the third metal powder to paraffin in the third metal powder and paraffin mixture is 4.44:

1.

5. The preparation method according to claim 1, characterized in that, In the step S1, the particle sizes of the first metal powder, the second metal powder, and the third metal powder are all not greater than 50 μm.

6. The preparation method according to claim 1, characterized in that, In the step S1, the first metal powder is a tungsten alloy powder; The second metal powder is a lead alloy powder; The third metal powder is an iron alloy powder.

7. The preparation method according to claim 1, wherein In the step S1, the preparation processes of the liquid first metal powder and paraffin mixture, the liquid second metal powder and paraffin mixture, and the liquid third metal powder and paraffin mixture are as follows: Step S11, weigh the metal powder and solid paraffin according to the ratio; Step S12, heat the solid paraffin to 85 °C ± 2 °C for melting to obtain liquid paraffin; Step S13, pour the liquid paraffin into the corresponding metal powder according to the ratio and stir evenly to obtain the liquid first metal powder and paraffin mixture, the liquid second metal powder and paraffin mixture, and the liquid third metal powder and paraffin mixture.

8. The preparation method according to claim 1, characterized in that, In the step S2, the temperature of the solidification and molding is room temperature, and the time is not less than 2 h.

9. A gradient metal powder and paraffin mixture prepared by the preparation method according to any one of claims 1-8, characterized in that, The gradient metal powder and paraffin mixture, by mass ratio, includes: 99 - 101 parts of the first metal powder, 59 - 61 parts of the second metal powder, 221 - 223 parts of the third metal powder, and 70 parts of paraffin.

10. The gradient metal powder and paraffin mixture according to claim 9, characterized in that, The gradient metal powder and paraffin mixture, by mass ratio, includes: 100 parts of tungsten alloy powder, 60 parts of lead alloy powder, 222 parts of ferroalloy powder, and 70 parts of paraffin.

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