Anti-active fragment impact explosion suppression oil tank with hard and tough composite structure

Abstract

The invention discloses an anti-active fragment impact explosion suppression oil tank of a hard and tough composite structure, and belongs to the technical field of oil tanks. The device comprises an outer hard dielectric layer, wherein the outer hard dielectric layer is used for resisting initial impact and penetration of active fragments; the inner tough dielectric layer is sprayed on the inner side of the outer hard dielectric layer and is used for dissipating fragment kinetic energy through a material deformation hysteresis effect; the oil storage side of the inner tough medium layer is covered with the self-recovery sealing layer, and the self-recovery sealing layer has an elastic self-recovery function after the fragments are perforated; the cavity micro cell element systems are uniformly distributed in the oil tank and are used for inducing fragments to oscillate and absorb energy; the grating compartment structure is used for dividing the interior of the oil tank into a plurality of independent cabins, the surface of a grating is coated with a self-sealing material, and subdivision oxygen blocking and elastic repairing are achieved. The active fragment impact prevention explosion suppression oil tank of the hard and tough composite structure aims at providing a multi-layer protection structure which can effectively resist active fragment impact and restrain oil tank explosion.

Description

Technical Field

[0001] The invention belongs to the technical field of oil tanks, and in particular relates to an explosion-suppressing oil tank with a hard-tough composite structure that is resistant to active fragment impact. Background Art

[0002] Traditional explosion-proof fuel tanks, such as CN91108677.3 and CN201811488737.7, primarily rely on flame retardant filling or single composite materials for impact resistance. However, facing the dual threat of kinetic energy impact and chemical reaction energy release from active fragments, they have the following shortcomings:

[0003] A single-layer structure makes it difficult to achieve both fragment blocking and energy dissipation at the same time; the lack of a rapid sealing mechanism for fragment perforation can easily lead to fuel leakage and secondary explosions; the traditional compartment structure is not efficient enough in absorbing fragment oscillation energy and cannot effectively suppress chain reactions. Summary of the Invention

[0004] The purpose of the present invention is to solve the problems raised in the background technology and to propose an explosion-suppressing fuel tank with a hard-tough composite structure that is resistant to active fragment impact and can effectively resist the impact of active fragments and suppress the explosion of the fuel tank.

[0005] In order to achieve the purpose of the present invention, the present invention discloses a hard-tough composite structure of an anti-active fragment impact explosion suppression oil tank, comprising an outer hard dielectric layer, an inner tough dielectric layer, a self-recovering sealing layer, a cavity micro-cell system and a grille compartment structure; the outer hard dielectric layer is used to resist the initial impact and penetration of active fragments; the inner tough dielectric layer is sprayed on the inner side of the outer hard dielectric layer, and is used to dissipate the kinetic energy of the fragments through the material deformation hysteresis effect; the self-recovering sealing layer is covered on the oil storage side of the inner tough dielectric layer, and has an elastic self-repair function after fragment perforation; the cavity micro-cell system is evenly distributed inside the tank, and is used to induce fragment oscillation and energy absorption; the grille compartment structure is used to divide the interior of the tank into multiple independent compartments, and the grille surface is coated with a self-sealing material to achieve oxygen isolation and elastic repair of the compartments.

[0006] Furthermore, the outer hard dielectric layer is made of tungsten steel and has a thickness of 5-10 mm.

[0007] Furthermore, the inner tough medium layer is made of polyurea-carbon fiber composite material with a thickness of 3-8 mm.

[0008] Furthermore, the self-recovering sealing layer is blended with natural rubber and a silane coupling agent and is adhered to the surface of the tough dielectric layer through a hot pressing process.

[0009] Furthermore, each microcell in the cavity microcell system is a hollow honeycomb structure, filled with an aluminum alloy frame and a damping medium. The aluminum alloy frame in the cavity microcell system is made of 6061 aluminum alloy, and the silicone-based gel filled inside has a viscosity of 5000-10000 cP and is fixed to the inner wall of the fuel tank by ultrasonic welding.

[0010] Furthermore, the honeycomb pore size of the honeycomb structure is 10-30 mm, and the damping medium is silicon-based gel or porous ceramic.

[0011] Furthermore, the self-sealing material is a high molecular polymer that swells when exposed to oil, covering both sides of the grille with a thickness of 1-3 mm.

[0012] Furthermore, the outer hard dielectric layer and the inner tough dielectric layer are fixed by titanium alloy rivets, and the bonding surface roughness Ra≤3.2μm. The grid of the grid compartment structure is made of Q235B steel, the mesh size is 100×100mm, and the self-sealing material is sodium polyacrylate-bentonite composite gel.

[0013] Furthermore, the tungsten steel is made of WC-10Co tungsten steel alloy, and its surface is carburized.

[0014] Furthermore, in the polyurea-carbon fiber composite material, the length of the chopped carbon fibers is 5-10 mm, the volume fraction is 15%, and the composite material is prepared by a high-pressure airless spraying process with a spraying pressure of ≥20 MPa.

[0015] Compared with the existing technology, the present invention's significant advancements lie in the following: 1) Through the composite design of an outer tungsten steel hard dielectric layer and an inner polyurea-carbon fiber tough dielectric layer, a layered impedance system is constructed. The hard dielectric layer utilizes its high hardness to resist the initial impact of fragments and induce their fragmentation, reducing penetration depth. The tough dielectric layer further dissipates the remaining kinetic energy of the fragments through the material deformation hysteresis effect. The two layers work together to achieve a dual protection of "blocking first, then dissipating energy." Subsequently, the self-healing sealing layer and the elastic repair function of the raw rubber material, combined with the oil-expanding self-sealing material coated on the surface of the grid compartment structure, automatically expand and block oxygen when the compartment is damaged, reducing the oxygen concentration in the compartment, preventing fuel leakage and cutting off combustion conditions. 2) Through a cavity micro-cell system evenly distributed within the fuel tank, utilizing a honeycomb structure composed of an aluminum alloy frame and damping medium, multi-interface reflection oscillations are induced when fragments impact, converting kinetic energy into heat energy and material internal energy. Combined with the compartment oxygen blocking design, the occurrence of explosive chain reactions is fundamentally suppressed.

[0016] In order to more clearly illustrate the functional characteristics and structural parameters of the present invention, further description is given below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0018] Figure 1 This is a schematic diagram of the overall cross-sectional connection structure of the present invention;

[0019] Figure 2 For the present invention Figure 1 Enlarged view of point A in the middle;

[0020] Figure 3 Schematic diagram of the structure of a partial cavity microcell system of the present invention.

[0021] In the figure: 1. Outer hard dielectric layer; 2. Inner tough dielectric layer; 3. Self-recovering sealing layer; 4. Cavity microcell system; 5. Grid compartment structure. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0023] Combine Figure 1-Figure 3 As shown, the present invention provides an explosion suppression fuel tank with a hard-tough composite structure that is resistant to active fragment impact, comprising:

[0024] The outer hard dielectric layer 1 is used to resist the initial impact and penetration of active fragments;

[0025] The inner tough dielectric layer 2 is sprayed on the inner side of the outer hard dielectric layer 1 and is used to dissipate the kinetic energy of the fragments through the material deformation hysteresis effect;

[0026] Self-recovery sealing layer 3, which covers the oil storage side of the inner tough dielectric layer 2 and has elastic self-repair function after being perforated by fragments;

[0027] The cavity micro-cell system 4 is evenly distributed inside the fuel tank and is used to induce fragment oscillation and energy absorption;

[0028] The grid compartment structure 5 is used to divide the interior of the fuel tank into multiple independent compartments. The surface of the grid is coated with self-sealing material to achieve oxygen isolation and elastic repair of the compartments.

[0029] In a preferred embodiment, the present invention can be further configured as follows: the outer hard medium layer 1 is made of tungsten steel material with a thickness of 5-10mm. When the active fragment impacts the fuel tank, the outer hard medium layer 1 is made of tungsten steel material, and its high hardness and wear resistance are utilized. At the moment of fragment impact, interface stress concentration is generated due to the difference in material hardness, inducing the fragment head to break, thereby reducing the penetration depth. Its thickness is set to 5-10mm. This range is based on the balance between fragment kinetic energy blocking and structural lightweight: if the thickness is less than 5mm, the tungsten steel layer will be difficult to withstand the initial impact of 14.5mm steel core active fragments, and penetration failure is likely to occur; if the thickness exceeds 10mm, although the protection capability can be improved, it will cause the weight of the fuel tank to increase significantly, which violates the lightweight requirement.

[0030] In a preferred embodiment, the present invention can be further configured as follows: the inner tough dielectric layer 2 is constructed of a polyurea-carbon fiber composite material with a thickness of 3-8 mm. After the active fragments penetrate the outer hard dielectric layer 1, the inner tough dielectric layer 2 utilizes the composite properties of polyurea prepolymer and chopped carbon fibers, achieving deformation hysteresis energy absorption through the material's high ductility and fiber damping effect. The elastic deformation of the polyurea matrix forces the fragments to deflect, dissipating kinetic energy. The addition of carbon fibers further enhances energy dissipation efficiency through fiber-matrix interface friction. Combined with the initial retardation of the outer hard dielectric layer 1, this achieves secondary dissipation of the fragments' remaining kinetic energy. Its thickness is set to 3-8mm, and this range is based on the dual considerations of kinetic energy dissipation efficiency and structural lightweight: if the thickness is less than 3mm, the deformation energy storage capacity of the polyurea-carbon fiber layer is insufficient, and it is difficult to cope with the residual kinetic energy after the fragments penetrate the hard dielectric layer; if the thickness exceeds 8mm, although it can improve the energy dissipation effect, it will significantly increase the weight of the fuel tank. At the same time, amine chain extenders and catalysts can also be added to the inner tough dielectric layer 2, and are sprayed on the inner side of the hard dielectric layer through high-pressure airless spraying with the polyurea-carbon fiber composite material in a volume ratio of 1:1, and a composite coating is formed after curing.

[0031] In a preferred embodiment, the present invention can be further configured as follows: the self-recovering sealing layer 3 is a blend of natural rubber and a silane coupling agent, adhered to the surface of the tough dielectric layer via a hot pressing process at a temperature of 120-150°C and a pressure of 5-8 MPa. When the active fragment penetrates the inner tough dielectric layer 2, the self-recovering sealing layer 3, covering the oil storage side of the layer, seals the puncture through the blend of natural rubber and silane coupling agent. Due to its high elasticity, the natural rubber expands and deforms under the action of fuel pressure at the moment of fragment penetration, filling the puncture hole. The silane coupling agent strengthens the interfacial adhesion between the rubber and the tough dielectric layer 2 through chemical bonding, preventing the sealing layer from falling off and failing. The hot pressing process parameters of 120-150°C and 5-8 MPa are determined by balancing the degree of crosslinking and interfacial bonding strength. Temperatures below 120°C prevent the natural rubber molecular chains from fully crosslinking, resulting in insufficient elastic recovery. Temperatures above 150°C cause the rubber molecular chains to break, leading to aging and embrittlement. When the pressure is lower than 5 MPa, the silane coupling agent does not react fully with the hydroxyl groups on the surface of the tough dielectric layer. When the pressure exceeds 8 MPa, the rubber density will be too high, reducing the elastic deformation capacity.

[0032] In a preferred embodiment, the present invention can be further configured as follows: each microcell in the cavity microcell system 4 is a hollow honeycomb structure, which is filled with an aluminum alloy frame and a damping medium. The aluminum alloy frame in the cavity microcell system 4 is made of 6061 aluminum alloy, and the viscosity of the silicone-based gel filled inside is

[0033] 5000-10000cP, fixed to the inner wall of the fuel tank through ultrasonic welding. When the active fragments penetrate the inner structure and enter the fuel tank, the cavity micro-cell system 4 realizes oscillation energy absorption through the synergistic effect of the aluminum alloy frame and the damping medium: the hollow honeycomb structure composed of the 6061 aluminum alloy frame uses the rigid support of the metal material to form a multi-interface reflection space. When the fragments hit, they will generate multi-directional oscillations between the honeycomb pore walls, and the silicone-based gel filled inside absorbs the vibration energy through the viscoelastic damping effect, converting the fragments' kinetic energy into heat energy and material internal energy. Among them, the selection of 6061 aluminum alloy is based on the balance between strength and lightweight - its tensile strength is ≥260MPa, which can withstand the impact force of fragments. The viscosity of the silicone-based gel is set to 5000-10000cP. This is because when the viscosity is too low, the gel fluidity is too strong and cannot effectively block the oscillation of fragments. If the viscosity is too high than 10000cP, the fragments will be directly embedded due to excessive damping, and the oscillation energy absorption effect will be lost. The ultrasonic welding process ensures that the bonding strength between the microcells and the inner wall of the fuel tank is improved to avoid falling off and failure under impact.

[0034] In a preferred embodiment of the present invention, the honeycomb structure can be further configured as follows: the honeycomb pore size is 10-30mm, the damping medium is silicone-based gel or porous ceramics, and when the active fragment enters the fuel tank and hits the cavity micro-cell system 4, the honeycomb pore size of the honeycomb structure is designed to be 10-30mm. This size range is based on the optimization of the fragment oscillation energy absorption efficiency and the structural space utilization rate: if the pore size is less than 10mm, the fragment is difficult to generate multi-directional oscillation due to space limitations, and the efficiency of converting kinetic energy into heat energy is significantly reduced; if the pore size exceeds 30mm, the fragment movement trajectory in the honeycomb structure is too smooth, and the collision The number of times is reduced, resulting in a significant decrease in the oscillation energy absorption effect. The damping medium is selected from silicone gel or porous ceramics. Both enhance the energy absorption effect through viscoelastic damping or porous dissipation mechanism: silicone gel uses the viscoelastic fluid properties to generate shear damping when the fragment oscillates and absorbs vibration energy; porous ceramics convert kinetic energy into elastic potential energy and thermal energy through the elastic deformation of the pore structure and air compression. The selection of the two materials takes into account the adaptability under different working conditions - silicone gel is suitable for dynamic impact scenarios and has a fast response speed; porous ceramics are resistant to high temperatures and can maintain energy absorption stability in high temperature environments.

[0035] In a preferred embodiment, the present invention can be further configured as follows: the self-sealing material is an oil-swelling polymer, covering both sides of the grille with a thickness of 1-3mm. When the active fragments impact and damage the fuel tank compartment, the oil-swelling polymer self-sealing material 6 covering the surface of the grille compartment structure 5 will trigger an expansion reaction due to fuel penetration, rapidly filling the compartment gaps, achieving oxygen barrier and elastic repair of the compartments. The material is selected from an oil-swelling polymer, and its mechanism of action is as follows: after the fuel contacts the material, the polymer chain segments absorb water and swell, rapidly expanding to 5-10 times their original volume, thereby sealing the gaps caused by the fragments and preventing oxygen diffusion and flame propagation. The thickness is set to 1-3mm based on the dual considerations of expansion efficiency and structural lightweighting: if the thickness is less than 1mm, the expansion capacity is insufficient and the coating is too thin, which is prone to cracking due to grille vibration. If the thickness exceeds 3mm, although the expansion sealing effect can be improved, the overall weight of the grille will increase by more than 20%, and too thick a coating will reduce the structural strength of the grille.

[0036] In a preferred embodiment, the present invention can be further configured as follows: the outer hard dielectric layer 1 and the inner tough dielectric layer 2 are fixed by titanium alloy rivets, and the roughness of the bonding surface Ra ≤ 3.2 μm; the grid of the grid compartment structure 5 is made of Q235B steel, the mesh size is 100×100 mm, and the self-sealing material is sodium polyacrylate-bentonite composite gel; when the active fragments impact the fuel tank, the outer hard dielectric layer 1 and the inner tough dielectric layer 2 are fixed by titanium alloy rivets, and the design of the bonding surface roughness Ra ≤ 3.2 μm can ensure that the two-layer structure forms a reliable coordinated protection system: titanium alloy rivets are high in strength and light in weight. Quantitative characteristics ensure connection strength while avoiding additional weight gain, and the rough surface with Ra ≤ 3.2μm increases the contact area, which improves the interfacial bonding strength of the two layers of material to ≥ 20MPa, preventing interlayer delamination during fragment impact. The grid compartment structure 5 adopts Q235B steel, and its 100×100mm grid size can divide the interior of the fuel tank into enough independent compartments, so that the fuel disturbance during fragment impact is limited to a single compartment, and the weight increase caused by too dense a grid is avoided. Combined with the sodium polyacrylate-bentonite composite gel self-sealing material coated on the surface, the polymer chain absorbs water and swells when it comes into contact with fuel.

[0037] In a preferred embodiment, the present invention can be further configured as follows: the tungsten steel material is WC-10Co tungsten steel alloy, and the surface is carburized. When the active fragments impact the outer hard dielectric layer 1, the design of using WC-10Co tungsten steel alloy and surface carburizing treatment can significantly improve the fragment blocking efficiency: the tungsten carbide WC in the WC-10Co alloy provides high hardness to resist fragment impact, and the carburizing treatment cooperates with the inner tough dielectric layer 2 to realize the layer-by-layer dissipation of the fragment kinetic energy.

[0038] In a preferred embodiment, the present invention can be further configured as follows: in the polyurea-carbon fiber composite material, the length of the short carbon fiber is 5-10mm, the volume fraction is 15%, and it is prepared by a high-pressure airless spraying process with a spraying pressure of ≥20MPa. The short carbon fiber length of 5-10mm can form a uniformly dispersed reinforcement network in the polyurea matrix. If the length is less than 5mm, the interface bonding area between the carbon fiber and the polyurea matrix is ​​insufficient, making it difficult to effectively transfer stress, resulting in reduced energy efficiency; if it exceeds 10mm, the carbon fiber is prone to agglomeration and entanglement, which destroys the ductility of the material. A volume fraction of 5% is the optimal ratio that takes into account both material toughness and damping performance: when it is lower than 15%, the carbon fiber reinforcement effect is insufficient; when it exceeds 15%, the continuity of the matrix will deteriorate due to the accumulation of carbon fibers. The high-pressure airless spraying process sprays the polyurea prepolymer and carbon fiber mixture at high speed to the inside of the hard dielectric layer at a pressure of ≥20MPa. This pressure ensures that the carbon fibers are evenly dispersed in the matrix while eliminating bubbles inside the coating. When the fragments impact, the high ductility of the polyurea matrix forces the fragments to deflect and deform, and the carbon fibers further dissipate kinetic energy through friction at the fiber-matrix interface.

[0039] When the active fragments impact the fuel tank, the outer hard dielectric layer 1 first uses the high hardness of tungsten steel to resist the initial impact, and the interface stress concentration caused by the difference in material hardness induces the fragment head to break, reducing the penetration depth; then the fragments enter the inner tough dielectric layer 2 sprayed on the inner side of the hard dielectric layer. The polyurea-carbon fiber composite material produces deformation hysteresis through high ductility and fiber damping effect, further dissipating the kinetic energy of the fragments; when the fragments penetrate the tough dielectric layer, the self-recovering sealing layer 3 covering the oil storage side of the fragments quickly seals the hole at the hole due to the action of fuel pressure, using the elastic deformation of raw rubber to reduce Slow down fuel leakage; at the same time, the fragments entering the fuel tank hit the evenly distributed cavity micro-cell system 4, and its hollow honeycomb structure composed of an aluminum alloy frame induces multi-directional oscillation of the fragments. The internal damping medium absorbs the vibration energy and converts the kinetic energy into heat energy and material internal energy until the fragment speed drops below the critical value; and the grid compartment structure 5 divides the interior of the fuel tank into independent compartments. The self-sealing material coated on its surface expands when it encounters fuel, and closes the gap when the compartment is damaged, realizing oxygen isolation and elastic repair of the compartments, preventing oxygen diffusion and flame propagation, and fundamentally suppressing the occurrence of explosion chain reactions.

[0040] Example verification

[0041] Test conditions: Firing tests were conducted using 14.5mm steel-core active fragments (initial velocity 800m / s). Results: The length of the residual fragments in the hard dielectric layer was ≤30% of the original length, and the tough dielectric layer was not penetrated. The self-healing layer sealed the puncture within 1 second, and the fuel leakage was ≤50ml / min. No deflagration was detected inside the fuel tank, and the peak pressure was ≤0.1MPa, meeting the GJB1389A-2005 explosion-proof standard.

[0042] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0043] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A hard-tough composite structure explosion-suppression fuel tank that is resistant to active fragment impact, characterized in that: The invention comprises an outer hard dielectric layer (1), an inner tough dielectric layer (2), a self-recovering sealing layer (3), a cavity micro-cell system (4) and a grid compartment structure (5); the outer hard dielectric layer (1) is used to resist the initial impact and penetration of active fragments; the inner tough dielectric layer (2) is sprayed on the inner side of the outer hard dielectric layer (1) and is used to dissipate the kinetic energy of the fragments through the material deformation hysteresis effect; the self-recovering sealing layer (3) is covered on the oil storage side of the inner tough dielectric layer (2) and has an elastic self-repairing function after the fragments are perforated; the cavity micro-cell system (4) is evenly distributed inside the fuel tank and is used to induce the fragments to oscillate and absorb energy; the grid compartment structure (5) is used to divide the interior of the fuel tank into multiple independent compartments, and the grid surface is coated with a self-sealing material to achieve oxygen isolation and elastic repair.

2. The explosion suppression fuel tank with a hard-tough composite structure and resistant to active fragment impact according to claim 1, characterized in that: The outer hard dielectric layer (1) is made of tungsten steel and has a thickness of 5-10 mm.

3. The explosion suppression fuel tank with a hard-tough composite structure and resistant to active fragment impact according to claim 1, characterized in that: The inner tough medium layer (2) is made of a polyurea-carbon fiber composite material and has a thickness of 3-8 mm.

4. The explosion suppression fuel tank with a hard-tough composite structure and resistant to active fragment impact according to claim 1, characterized in that: The self-recovering sealing layer (3) is made by mixing natural rubber and a silane coupling agent, and is adhered to the surface of the tough dielectric layer through a hot pressing process.

5. The explosion suppression fuel tank with a hard-tough composite structure and resistant to active fragment impact according to claim 1, characterized in that: Each microcell in the cavity microcell system (4) is a hollow honeycomb structure, which is filled with an aluminum alloy frame and a damping medium. The aluminum alloy frame in the cavity microcell system (4) is made of 6061 aluminum alloy, and the silicon-based gel filled inside has a viscosity of 5000-10000 cP and is fixed to the inner wall of the oil tank by ultrasonic welding.

6. The explosion suppression fuel tank with a hard-tough composite structure that is resistant to active fragment impact according to claim 5, characterized in that: The honeycomb pore size of the honeycomb structure is 10-30 mm, and the damping medium is silicon-based gel or porous ceramics.

7. The explosion suppression fuel tank with a hard-tough composite structure and resistant to active fragment impact according to claim 1, characterized in that: The self-sealing material is a high molecular polymer that swells when exposed to oil, covers both sides of the grid, and has a thickness of 1-3 mm.

8. The explosion suppression fuel tank with a hard-tough composite structure and resistant to active fragment impact according to claim 1, characterized in that: The outer hard dielectric layer (1) and the inner tough dielectric layer (2) are fixed by titanium alloy rivets, and the roughness of the bonding surface Ra is less than or equal to 3.2 μm. The grid of the grid compartment structure (5) is made of Q235B steel, and the grid size is 100×100 mm. The self-sealing material is a sodium polyacrylate-bentonite composite gel.

9. The explosion suppression fuel tank with a hard-tough composite structure and resistant to active fragment impact according to claim 2, characterized in that: The tungsten steel is made of WC-10Co tungsten steel alloy, and its surface is carburized.

10. The explosion suppression fuel tank with a hard-tough composite structure that is resistant to active fragment impact according to claim 3, characterized in that: In the polyurea-carbon fiber composite material, the length of the chopped carbon fibers is 5-10 mm, the volume fraction is 15%, and the composite material is prepared by a high-pressure airless spraying process with a spraying pressure of ≥20 MPa.

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