Hybrid filled core sandwich structure with self-healing function and its preparation method

Abstract

This invention discloses a hybrid-filled core sandwich structure with self-healing capabilities. Based on a complex core sandwich structure, the hybrid core sandwich structure uses functional filler materials to fill the hollow core, enabling it to possess thermal control and laser weapon damage protection functions in addition to its original load-bearing and impact protection performance. By adjusting the filling strategy of the functional filler materials, the hybrid-filled core sandwich structure of this invention can possess self-healing properties against laser ablation damage, achieving secondary / multiple protection against high-energy laser weapons. The hybrid-filled core sandwich structure of this invention can be applied to sea, land, air, and space-based equipment facing the risk of ablation penetration or high-temperature damage from high-energy laser weapons.

Description

Technical Field

[0001] This invention relates to the field of high-energy laser weapon damage protection armor, specifically a hybrid filled core sandwich structure with self-healing function and its preparation method. Background Technology

[0002] High-energy laser weapons and their destructive effects constitute a complex process, involving the combined damage of multiple destructive elements from the absorption, heating, melting or pyrolysis, sublimation, and vaporization of materials by the laser beam, to the formation of pits, perforations, and explosions. Correspondingly, protection against high-energy laser weapons is an extremely complex engineering problem involving multiple disciplines. Currently, the most common high-energy laser weapon protection strategies include developing high-temperature ablation materials and applying laser-protective coatings. However, these methods are characterized by long development cycles, huge costs, and high uncertainties, posing significant engineering challenges for the rapid application of high-energy laser protection to existing equipment. Furthermore, the aforementioned high-energy laser protection strategies have a single protection mechanism, and the protection method fails after the initial laser ablation damage, lacking secondary or multiple protection capabilities. Summary of the Invention

[0003] To address the problems of the prior art, this invention provides a hybrid filled core sandwich structure with self-healing function and its preparation method. By filling the interior of the lattice core with specific functional filler materials, the overall structure acquires excellent resistance to laser ablation damage and meets the protection performance requirements of secondary or multiple high-energy laser weapons.

[0004] This invention provides a hybrid core sandwich structure with self-healing function, including a complex core sandwich structure and a functional filler. The complex core sandwich structure includes two panels with a lattice core distributed between the two panels. The functional filler includes self-healing functional filler particles, high-temperature resistant functional filler particles, and high-temperature phase change filler material, and the functional filler is filled inside the lattice core.

[0005] Further improvements include a three-period minimal curvature thin-walled core and a lattice grid core.

[0006] In a further improvement, the high-temperature resistant functional filler particles and high-temperature phase change filler materials are mixed and filled inside the lattice grid core, and the self-healing functional filler particles and high-temperature phase change filler materials are mixed and filled inside the three-period minimal curvature thin-walled core.

[0007] In a further improvement, the three-period minimal curvature thin-walled core is a flowable curved cell structure, which is assembled from any one or more arrays of Gyroid-type cells, Schwarz-type cells, Diamand-type cells, SplitP-type cells, and Neovius-type cells.

[0008] In a further improvement, the dot matrix grid core is a flowable grid structure, which is assembled from any one or more arrays of Simple type grid, Fluorite type grid, Weaire-Phelan type grid, Truncated type grid, Kelvin type grid, and Re-entrant type grid.

[0009] The connectivity of the three-period minimal curvature thin-walled core is lower than that of the grid lattice core structure. This ensures that the high-temperature phase change filling material inside the local cavity reduces the constraint on the self-healing functional filling particles after high-temperature liquefaction, allowing it to act as a lubricant during the rapid migration of the self-healing functional filling particles to the high-temperature ablation damage area.

[0010] The present invention also provides a method for preparing a hybrid filled core sandwich structure with self-healing function, comprising the following steps:

[0011] S1. A lattice core with a specific cell configuration is processed from the parent material using machining or 3D printing additive manufacturing technology;

[0012] S2. Use welding or 3D printing additive manufacturing technology to assemble the panel and the dot matrix core structure into a complex core sandwich structure.

[0013] S3. Seal the edges of the sandwich structure with flexible materials such as sealing tape, gauze, and plastic film, and use the openings in the seal as filling ports.

[0014] S4. Fill the lattice core with self-healing functional filler particles and high-temperature resistant functional filler particles in sequence through the filler inlet, and seal the filler inlet after the filling process is completed.

[0015] S5. Heat the high-temperature phase change filler material until it is completely melted, and set aside.

[0016] S6. Use negative pressure drainage technology to fill the molten high-temperature phase change filler material into the sandwich structure containing particulate filler material. Stop after the molten liquid of the high-temperature phase change filler material has completely filled the interior of the lattice core.

[0017] S7. Place the completed complex core sandwich structure at room temperature for 2 to 6 hours. After the phase change material has solidified, remove the surface stains.

[0018] Further improvements include ensuring that the materials of the self-healing functional filler particles, panels, and complex core sandwich structure remain consistent, and that the material is made from any one of carbon steel, stainless steel, titanium alloy, aluminum alloy, PEEK, polystyrene, and nylon.

[0019] In a further improvement, the high-temperature resistant functional filler particles are made of one or more of the following materials: alumina ceramics, silicon oxide ceramics, zirconium oxide ceramics, boride ceramics, and tungsten carbide ceramics.

[0020] In a further improvement, the high-temperature phase change filler material is one or more of the following: n-hexadecane, n-octadecane, paraffin wax, stearic acid, palmitic acid, and polyethylene glycol.

[0021] The beneficial effects of this invention are as follows:

[0022] 1. The lattice core sandwich structure exhibits superior load-bearing and impact protection performance compared to traditional homogeneous structures. Furthermore, by filling the porous core with functional materials, it gains high-temperature resistance and laser ablation resistance.

[0023] 2. By adjusting the material and filling ratio of the self-healing filler particles, the response time and self-healing effect of the overall sandwich structure after high-energy laser ablation damage can be improved, thereby adjusting the residual protection performance of the overall sandwich structure after the first penetration damage by a high-energy laser weapon.

[0024] 3. By using functional materials mixed and filled inside the lattice core sandwich structure, an integrated protective armor with multiple functions such as load-bearing, impact resistance, high temperature resistance, and laser damage resistance is achieved. In addition, this type of armor also has multiple damage resistance performance, which greatly improves the battlefield survivability and service performance of the equipment.

[0025] 4. Depending on the application and processing method, hybrid filling sandwich structures can be made into regular shapes or other specific shapes to facilitate modular assembly and splicing, thereby achieving protection against high-energy laser weapons for large-sized or irregularly shaped equipment.

[0026] 5. In certain special circumstances, such as high-temperature explosive impact environments, measures such as using panels of unequal thickness and mixed filling of functional filling materials can be adopted to customize and improve the overall protective performance of the structure and extend the battlefield survival cycle of the protected body.

[0027] 6. Selecting high-temperature phase change filler materials with specific phase change temperatures, such as paraffin wax with a melting point of 40℃, paraffin wax with a melting point of 80℃, and polyethylene with a melting point of 130℃, as filler materials can enable functional design of the temperature control and heat management capabilities of the overall hybrid filler sandwich structure.

[0028] 7. It can be applied to equipment in service on land, sea, air and space that face the risk of being destroyed by high-energy laser weapons, and can also be used in engineering fields such as personnel and equipment protection for processing techniques such as cutting and welding using high-energy laser beams. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 A schematic diagram of a hybrid filled core sandwich structure capable of self-healing from high-energy laser ablation damage;

[0031] Figure 2 A schematic diagram of a continuous curved surface lattice cell structure with internal flow characteristics;

[0032] Figure 3 A schematic diagram of the grid lattice cell configuration for internal flow characteristics;

[0033] Figure 4 Comparison of test results of laser ablation damage protection of hybrid lattice-filled core sandwich structures with self-healing properties against high-energy laser ablation damage under high-energy laser beam irradiation.

[0034] In the figure, 1. Panel; 2. Three-period minimal curvature thin-walled core; 3. Dot grid core; 4. Self-healing functional filler particles; 5. High-temperature resistant functional filler particles; 6. High-temperature phase change filler material. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] In the description of this invention, it should be noted that, unless otherwise specified, terms such as "panel," "core," "filler," "cell," and "lattice" should be interpreted broadly. For example, "panel" can refer to the upper or lower panel of an integral sandwich structure, the sandwich panel between two cores, or a plate-like structure used for encapsulation up to the edge. "Core" can be a continuous curved surface lattice structure, a lattice grid structure, or other sub-components with the function of a sandwich core. Those skilled in the art can understand the specific meaning of the above terms in this invention according to specific working conditions.

[0037] Please see Figure 1The hybrid-filled core sandwich structure with self-healing high-energy laser ablation damage described in this invention mainly consists of a complex core sandwich structure and functional fillers. The complex core sandwich structure comprises a panel 1, a three-period minimal curvature thin-walled core 2, and a lattice grid core 3. The functional fillers include self-healing functional filler particles 4, high-temperature resistant functional filler particles 5, and high-temperature phase change filler material 6. In the sandwich structure described in this invention, the high-temperature resistant functional filler particles 5 and the high-temperature phase change filler material 6 are mixed and filled inside the lattice grid core 3. The purpose is that the high-temperature phase change filler material 6 can absorb the heat generated by laser radiation through phase change flow or even vaporization migration during high-temperature laser ablation; simultaneously, the lattice grid core 3 can restrict the flow of the high-temperature resistant filler particles to a certain extent, allowing them to fully exert their high-temperature protection function. Correspondingly, self-healing functional filler particles 4 and high-temperature phase change filler material 6 are mixed and filled inside the three-period minimal curvature thin-walled core 2. The purpose is that the continuous curved core structure can, to a certain extent, avoid the vertical radiation of the laser beam, increase the reflection of the laser beam on the core structure, and thus reduce local heat input. In addition, the connectivity of the three-period minimal curvature thin-walled core 2 is worse than that of the grid lattice core structure 3, so as to ensure that the high-temperature phase change filler material 6 inside the local cavity reduces the constraint on the self-healing functional filler particles 4 after high-temperature liquefaction, and plays a lubricating role in the rapid migration of the self-healing functional filler particles 4 to the high-temperature ablation damage area. At the same time, the array of three-period minimal curvature thin-walled core 2 is a relatively closed continuous cavity. These cavity spaces avoid excessive migration and volatilization of the phase change filler material 6 due to phase change liquefaction or vaporization, and avoid the loss of the overall sandwich structure's functions of local temperature thermal management and thermal control. In addition, by selecting or combining different high-temperature phase change filler materials 6, such as paraffin wax with a melting point of 40℃, paraffin wax with a melting point of 80℃, and polyethylene with a melting point of 130℃, the thermal control performance of the overall sandwich structure can be functionally regulated.

[0038] Furthermore, the cell configuration of the three-period minimal curvature thin-walled core structure 2 with internal flow characteristics is different (see [link]). Figure 2 This includes any one of the following cell types: Gyroid, Schwarz, Diamond, SplitP, and Neovius.

[0039] Furthermore, the cell configuration of the grid lattice core 3 with internal connectivity characteristics is different (see [link to relevant documentation]). Figure 3 This includes any one of the following: Simple type grid, Fluorite type grid, Weaire-Phelan type grid, Truncated type grid, Kelvin type grid, and Re-entrant type grid.

[0040] An embodiment of the hybrid filled core sandwich structure with self-healing ability to withstand high-energy laser ablation damage described in this invention is as follows:

[0041] S1. A lattice core with a specific cell configuration is processed from the base material using machining techniques such as cutting, stamping, and brazing.

[0042] S2. The panel and the dot matrix core structure are assembled into a dot matrix core sandwich structure using welding technology.

[0043] S3. Seal the edges of the sandwich structure with flexible materials such as sealing tape, gauze, and plastic film, and use the openings in the seal as filling ports.

[0044] S4. Fill the high-temperature heat protection filling particles and healing filling particles into the matrix core through the filling port in sequence, and seal the filling port after the filling process is completed.

[0045] S5. Heat the high-temperature phase change filler material until it is completely melted, and set aside.

[0046] S6. Use negative pressure drainage technology to fill the molten phase change material liquid into the sandwich structure containing particulate filler material, and stop after the molten phase change material liquid has completely filled the interior of the lattice core.

[0047] S7. Place the filled hybrid lattice sandwich structure at room temperature for 2 to 6 hours. After the phase change material has solidified, remove the sealing film at the edge of the sandwich structure and clean the surface stains.

[0048] Example 2 of the hybrid filled core sandwich structure with self-healing ability to withstand high-energy laser ablation damage described in this invention:

[0049] S1. Using 3D printing additive manufacturing technology, the parent material is processed into a specific lattice core sandwich structure.

[0050] S2. Seal the edges of the sandwich structure with flexible materials such as sealing tape, gauze, and plastic film, and use the openings in the seal as filling ports;

[0051] S3. Fill the high-temperature thermal protection filling particles and healing filling particles into the matrix core through the filling port in sequence, and seal the filling port after the filling process is completed.

[0052] S4. Heat the high-temperature phase change filler material until it is completely melted, and store it in a constant-temperature container for later use.

[0053] S5. Place the complex lattice core sandwich structure with high-temperature resistant filling particles and self-healing filling particles in the phase change material melt in a constant temperature container, so that the sandwich structure is completely immersed in the phase change material melt.

[0054] S6. After the air inside the mixed-filled sandwich structure is completely emptied, it indicates that the molten liquid of the phase change material has completely filled the interior of the lattice core. Then adjust the constant temperature container to room temperature and let it stand for 2 h to 6 h.

[0055] S7. After the phase change material has cured and formed, remove the sealing film at the edge of the sandwich structure and clean the surface stains.

[0056] Please see Figure 4 The high-energy laser ablation time of the hybrid-filled lattice core sandwich structure and the phase change material-filled lattice core sandwich structure under high-energy laser beam irradiation was plotted. Meanwhile, a homogeneous solid structure of the same mass as the hybrid-filled lattice core sandwich structure was selected as the benchmark structure. Figure 4 The horizontal axis represents the output power of the high-energy laser beam, and the vertical axis represents the duration of penetrating damage to the target structure due to high-temperature ablation caused by the high-energy laser irradiation. For the test target, the higher the output power of the high-energy laser, the longer the ablation resistance time under that laser beam, and the better its protection against high-energy laser ablation damage. Therefore, for Figure 4 In general, test results located on the upper right indicate that the target structure has good high-energy laser protection performance, while test results located on the lower left indicate that the target structure has poor high-energy laser protection performance. Figure 4 The comparative results show that the core-filled sandwich structure exhibits significantly better protection against high-energy laser ablation damage than the homogeneous solid structure of the same mass. Furthermore, the hybrid-filled lattice core sandwich structure demonstrates the most superior high-energy laser protection performance. Moreover, under 1500 W laser beam irradiation, after penetrating damage, the hybrid-filled lattice core sandwich structure exhibits self-healing response to the penetration damage. When the healed area is irradiated again with a 1500 W high-energy laser beam, the hybrid-filled lattice sandwich structure withstands high-energy laser high-temperature ablation damage for 8 seconds. This indicates that the hybrid-filled lattice sandwich structure described in this invention possesses a significant self-healing function against high-energy laser ablation damage, giving it a remarkable ability to resist secondary or multiple attacks from high-energy laser weapons.

[0057] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to interchangeably. Each embodiment focuses on its differences from other embodiments. In particular, for the device embodiments, the above descriptions are merely preferred embodiments of the present invention. Since they are fundamentally similar to the method embodiments, the descriptions are relatively simple, and relevant parts can be referred to the descriptions of the method embodiments. The above descriptions are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention, without departing from the principle of the present invention, should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A hybrid filled core sandwich structure with self-healing function, characterized in that: The device includes a complex core sandwich structure and functional fillers. The complex core sandwich structure includes two panels with a lattice core distributed between them. The functional fillers include self-healing functional filler particles, high-temperature resistant functional filler particles, and high-temperature phase change filler materials, which are filled inside the lattice core. The lattice core includes a three-period minimal curvature thin-walled core and a lattice grid core. The high-temperature resistant functional filler particles and high-temperature phase change filler materials are mixed and filled inside the lattice grid core, and the self-healing functional filler particles and high-temperature phase change filler materials are mixed and filled inside the three-period minimal curvature thin-walled core.

2. The hybrid filled core sandwich structure with self-healing function according to claim 1, characterized in that: The three-period minimal curvature thin-walled core is a flowable curved cell structure, which is assembled from any one or more arrays of Gyroid-type cells, Schwarz-type cells, Diamand-type cells, SplitP-type cells, and Neovius-type cells.

3. The hybrid filled core sandwich structure with self-healing function according to claim 2, characterized in that: The dot matrix grid core is a flowable grid structure, which is assembled from any one or more arrays of Simple type grid, Fluorite type grid, Weaire-Phelan type grid, Truncated type grid, Kelvin type grid, and Re-entrant type grid.

4. The hybrid filled core sandwich structure with self-healing function according to claim 3, characterized in that: The connectivity of the three-period minimal curvature thin-walled core is lower than that of the grid lattice core structure.

5. A method for preparing a hybrid filled core sandwich structure with self-healing function, comprising using the hybrid filled core sandwich structure with self-healing function as described in claim 1, characterized in that... Includes the following steps: S1. A lattice core with a specific cell configuration is processed from the parent material using machining or 3D printing additive manufacturing technology; S2. Use welding or 3D printing additive manufacturing technology to assemble the panel and the dot matrix core structure into a complex core sandwich structure. S3. Seal the edges of the sandwich structure with a flexible material, and use the opening in the seal as a filler port; S4. Fill the lattice core with self-healing functional filler particles and high-temperature resistant functional filler particles in sequence through the filler inlet, and seal the filler inlet after the filling process is completed. S5. Heat the high-temperature phase change filler material until it is completely melted, and set aside. S6. Use negative pressure drainage technology to fill the molten high-temperature phase change filler material into the sandwich structure containing particulate filler material. Stop after the molten liquid of the high-temperature phase change filler material has completely filled the interior of the lattice core. S7. Place the completed complex core sandwich structure at room temperature for 2 to 6 hours. After the phase change material has solidified, remove the surface stains.

6. The method for preparing a hybrid filled core sandwich structure with self-healing function according to claim 5, characterized in that: The self-healing functional filler particles, panels, and complex core sandwich structure are made of the same material, which is prepared from any one of carbon steel, stainless steel, titanium alloy, aluminum alloy, PEEK, polystyrene, and nylon.

7. The method for preparing a hybrid filled core sandwich structure with self-healing function according to claim 5, characterized in that: The high-temperature resistant functional filler particles are high-temperature ceramic particles, and the material types are any one or more of alumina ceramics, silicon oxide ceramics, zirconium oxide ceramics, boride ceramics, and tungsten carbide ceramics.

8. The method for preparing a hybrid filled core sandwich structure with self-healing function according to claim 5, characterized in that: The high-temperature phase change filler material is one or more of the following: n-hexadecane, n-octadecane, paraffin wax, stearic acid, palmitic acid, and polyethylene glycol.

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