Rod-based ceramic lattice structure adopting bionic variable cross section, preparation method and application

Abstract

The invention discloses a rod-based ceramic lattice structure adopting a bionic variable cross-section, a preparation method and application, according to a bionic principle, bamboo characteristics are extracted, a bionic variable cross-section rod is designed, a structural unit of the rod is of a structure with a thin middle and two thick ends, and two structural parameters are introduced to describe the topological structure; constructing dot matrix unit cells by using a bionic variable cross-section rod, and obtaining a dot matrix through an array; establishing a three-dimensional model of the dot matrix and storing the three-dimensional model in an STL format; importing the model into a 3D printer, and preparing a ceramic dot matrix by using a photocuring additive manufacturing technology; the quasi-static compression performance of the ceramic dot matrix is researched by adopting a method of combining finite element numerical simulation and real testing. Through bionic design, the mechanical property of the ceramic dot matrix is improved, and the problems that a traditional porous ceramic structure is complex in process, poor in designability and low in performance predictability are solved. The material can be used as a damping and explosion-proof material in the fields of aerospace, ship industry, metallurgy and chemical industry.

Description

Technical Field

[0001] The present invention relates to the technical field of ceramic materials, and in particular to a bionic ceramic lattice structure material, a preparation method and related applications. Background Art

[0002] Traditional methods for preparing porous ceramics include direct foaming, sol-gel, pore-forming agent, and freeze-drying. Although these methods can produce porous ceramics, they have the disadvantages of low porosity, uneven pore size, and the inability to achieve complex and precise structures. In addition, the structural designability is poor, the performance predictability is low, and the structure and performance of porous ceramics cannot be precisely controlled. With the rapid development of ceramic additive manufacturing technology, ceramic lattices with precise and complex structures have become a research topic that has attracted increasing attention, and have demonstrated excellent properties such as lightweight and high load-bearing capacity. Ceramic lattices refer to periodic porous structure ceramics composed of repeating cell units, which have higher design freedom than traditional porous ceramics.

[0003] For ceramic lattice structures, the existing technology has the following problems: 1. The use of traditional weaving technology or template molding technology leads to complex process flow and low process precision; 2. Structural design focuses on existing structures that have been extensively studied, such as TPMS structures, and the exploration of new structural designs is still in the preliminary stage; 3. The relationship between structural design and preparation technology is not considered. Structural design separated from the preparation technology lacks applicability in actual engineering.

[0004] Existing technology uses clay and industrial alumina as raw materials, using a direct foaming method and mechanical activation technology (ball milling) to produce mullite foam ceramics. By adjusting the alumina particle size, higher compressive strength can be achieved. The best performance of porous alumina ceramics is a compressive strength of 5.4 MPa at a relative density of 20.1%. However, this preparation method is relatively complex, and the influence of particle size adjustment has its limits, making it impossible to achieve higher compressive strength.

[0005] Another technology proposes a ceramic-based corrugated lattice composite flat plate to simplify the thermal protection component structure, improve the bonding strength between the panel and the core layer, reduce the thermal protection structure's mass, increase the payload, and improve its efficiency. However, this technology utilizes an integrated hot pressing and precursor impregnation and pyrolysis process, which results in complex preparation methods, low precision, and significant manufacturing difficulties.

[0006] Another technology offers a method for sintering and demolding at low temperature and low pressure. This method, which involves sintering the mold after slurry injection in a low-pressure environment, can effectively improve the production of lattice ceramics. While this technology solves the problem of sintering residue by 3D printing the mold, injecting slurry, and then sintering to create a ceramic lattice structure, it still suffers from long production cycles, low precision, and complex manufacturing processes.

[0007] There are also technologies that use 3D printing technology to prepare two types of alumina ceramic lattices: a hollow rod lattice structure and a solid rod lattice structure. The solid rod lattice achieved a maximum compressive strength of 9.70 MPa at a relative density of 55%. The hollow rod lattice achieved a maximum compressive strength of 4.30 MPa at a relative density of 30%. Although this work studied two different rod structures (hollow and solid), this structure was still considered under the condition of a constant cross-section, and the compressive strength of the hollow rod lattice was lower than that of the solid rod. The situation under the condition of cross-section change was not involved.

[0008] Photocuring technology has also been used to prepare silicon nitride ceramic lattices with Gyroid and Octet truss structures. The Gyroid structure has a minimum relative density of 32.7%, corresponding to a compressive strength of 16.6 MPa, while the Octet truss structure has a minimum relative density of 27.1%, corresponding to a compressive strength of 6.4 MPa. This work successfully prepared ceramic lattices of both structures, but the minimum relative density of both structures is relatively high and lacks parameters that can be used to control the structure. This makes it impossible to meet the needs of variable control of structural parameters.

[0009] In summary, the existing technology has the following technical defects: the preparation process is complex, the precision is low, the cycle is long, the structure of the lattice is too complex and difficult to prepare or the research on the structure is not in-depth enough, the mechanical properties of the lattice are not excellent enough, and it cannot adapt to the manufacturing needs and applications of variable-section ceramics. Summary of the Invention

[0010] The technical problem to be solved by the present invention is to provide a rod-based ceramic lattice structure with a bionic variable cross-section, a preparation method and an application, which significantly reduces the process complexity and makes the structure and performance controllable, thereby solving the problems of traditional porous ceramic structures with complex processes, poor designability and low performance predictability.

[0011] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0012] A ceramic bionic variable-section rod is characterized by comprising at least one complete node and two internodes connected at both ends of the node; the nodes and internodes are alternately periodically distributed and connected in a straight line to form a rod body, and the node cross-section is larger than the internode cross-section, so that the rod body is thin in the middle and thick at both ends.

[0013] In the above technical solution, one internode end is cut into a plane by the center of the top surface of the cube, and the other internode end is cut into three trihedrons with right angles to each other by a corner on the bottom surface of the cube.

[0014] In the above technical solution, the nodes are arranged such that the smooth circumference protrudes symmetrically from the internodes at both ends, and the internodes at both ends are of equal length.

[0015] A bionic variable cross-section rod-based ceramic lattice structure, characterized by:

[0016] One end of four ceramic bionic variable-section rods of the same size are combined into a vertex, and the vertex is located at the center of a top surface of the cube and is flat;

[0017] The other ends of each rod are located at the four corners of the bottom surface of the cube to form supporting feet;

[0018] Each support leg is cut into three trihedrons with faces at right angles to each other by cutting a corner of the bottom surface of the cube, thereby forming a lattice ceramic unit cell structure.

[0019] A bionic variable cross-section rod-based ceramic lattice structure, characterized by:

[0020] A lattice ceramic unit cell structure with its vertex located on the top surface and a lattice ceramic unit cell structure of the same size with its vertex located on the bottom surface are symmetrically inverted and combined in a cube with its outer contour located between the bottom and top surfaces to form a ceramic lattice variable cross-section unit.

[0021] A rod-based ceramic lattice structure with bionic variable cross-section is characterized by comprising at least two of the ceramic lattice variable cross-section units.

[0022] A method for preparing a rod-based ceramic lattice structure with a bionic variable cross-section, characterized by comprising:

[0023] By modifying the length and diameter of the nodes and internodes, a ceramic bionic variable-section rod is obtained, wherein the bionic variable-section rod comprises at least one complete node and two internodes connected at both ends of the node, wherein the node and the internodes are spaced and connected to form a rod body; the node cross-section is larger than the internode cross-section;

[0024] By copying, translating, rotating and performing Boolean operations on the bionic variable-section rods, a lattice structure unit cell consisting of four or eight bionic variable-section rods of the same size is established according to the modified body-centered cubic configuration. The lattice structure unit cells are arrayed in space to obtain a periodic ceramic lattice structure.

[0025] In the above technical solution, the two structural parameters of the bionic variable-section rod are preferably defined as follows:

[0026] The rod diameter variation parameter α is the ratio of the maximum diameter to the minimum diameter: α = dmax / d min ;

[0027] The node length parameter β is the ratio of the node to the length of the single segment: β = l node / l;

[0028] In the above two structural parameter expressions, the segment length is l and the minimum diameter is d min , the node length is l node The node range along the length of the rod passes through (0.6α+0.4)d min Determine, where the value range of α is [1.0, 2.5], and the value range of β is [0.15, 0.6].

[0029] In the above technical solution, one end of four bionic variable-section rods of the same size are combined into a vertex, and the vertex is located at the center of a top surface of the cube and is flat; the other end of each rod is located at the four corners of the bottom surface of the cube to form a support foot, and each support foot is cut into three truncated trihedrons with right angles to each other by a corner of the bottom surface of the cube, thereby forming a lattice structure unit cell.

[0030] In the above technical solution, based on the nodes and internodes distributed in an alternating period, the bionic variable-section rod is obtained by modifying the lengths and diameters of the nodes and internodes.

[0031] In the above technical solution, advanced additive manufacturing technology is used to prepare ceramic lattices with variable cross-section microstructure characteristics.

[0032] In the above technical solution, the right-angled surfaces or truncated surfaces of the legs of adjacent lattice structure units are connected to each other to form a bonding surface, and multiple truncated surfaces are connected to form a variable-section node.

[0033] In the above technical solution, the bionic variable-cross-section rods are constructed using operations such as replication, translation, rotation, and Boolean operations, forming a modified body-centered cubic lattice configuration. This creates a lattice structure unit cell measuring 8×8×8mm, consisting of eight identically sized bionic variable-cross-section rods. The unit cells are arranged in a 3×3×3 array in space, resulting in a periodic lattice structure measuring 24×24×24mm. Considering the precision of the fabrication process and the size of the equipment, the unit cell size is no less than 4×4×4mm, and the lattice size is no more than 60×60×60mm.

[0034] In the above technical solution, the structural unit of each bionic variable-section rod has a structure that is thin in the middle and thick at both ends, which is similar to the appearance characteristics of bamboo.

[0035] In the above technical solution, two structural parameters are introduced to describe the topological structure; a lattice unit cell is constructed using a bionic variable-section rod and a lattice is obtained through an array.

[0036] After arraying the unit cell structure to obtain a lattice structure, the method further includes: performing quasi-static compression numerical simulation using finite element software to test the stress-strain curve and stress distribution of the lightweight ceramic lattice using bionic variable-section rods.

[0037] In the above technical solution, a three-dimensional model of the lattice is established and saved in STL format; the model is imported into a 3D printer, and the ceramic lattice is prepared using light-curing additive manufacturing technology.

[0038] A lightweight ceramic lattice model using bionic variable-section rods was established using 3D modeling software and saved as an STL file.

[0039] The STL file is imported into the light-curing 3D printer, and the model embryo is printed using alumina slurry. The embryo is then converted into dense ceramics through debinding and sintering.

[0040] In the above technical solution, a method combining finite element numerical simulation and actual testing is used to study the quasi-static compression performance of ceramic lattices.

[0041] The ceramic material lattice structure of the present invention has a large number of regular pores inside. By designing and adjusting the structure, the ceramic material lattice structure can be integrated with the characteristics of lightweight, high strength, and high energy absorption, and can be used for structural vibration reduction, explosion protection and energy absorption.

[0042] Therefore, the present invention also provides an application of a rod-based ceramic lattice structure with a bionic variable cross-section, which is used as a vibration reduction and explosion-proof material in the fields of aerospace, shipbuilding, metallurgy and chemical industry.

[0043] This invention, through biomimetic design, not only improves the mechanical properties of ceramic lattices but also addresses the complex manufacturing processes, poor designability, and low performance predictability of conventional porous ceramic structures. This method allows for the customization of the mechanical properties of ceramic structures, demonstrating promising potential for practical applications.

[0044] The beneficial effects produced by the present invention are:

[0045] Based on the principles of bionics, this paper proposes a variable-section rod design method and applies it to alumina ceramic lattice structures. High-quality samples were successfully produced using photo-curing additive manufacturing. Compared to existing technologies, the technical solution conceived by this paper achieves the following beneficial effects:

[0046] The present invention solves the problems of complex process flow and low process precision of traditional porous ceramic structures through bionic variable cross-section design, and for the first time applies the microstructural characteristics of variable cross-section design to the design and preparation of ceramic lattice structures.

[0047] The present invention defines two structural parameters to regulate the geometric characteristics of the bionic variable cross-section design. This design not only alleviates internal stress concentration and improves compressive strength, but also achieves customized structural performance through customized structural design, which was previously unattainable with ceramic lattice structures.

[0048] The present invention takes into account both structural design and preparation technology, and uses advanced additive manufacturing technology to prepare ceramic lattices with variable cross-section microstructure characteristics, which not only ensures the mechanical bearing capacity of the overall structure, but also has practical engineering application value.

[0049] The present invention belongs to the field of ceramic lattice structure design. The ceramic lattice has excellent load-bearing capacity and energy absorption performance. It can realize functions such as electromagnetic wave absorption, sound wave regulation and heat management under complex working conditions such as high temperature and high pressure. It has broad application prospects in aerospace, shipbuilding industry, metallurgy and chemical industry, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0051] Figure 1 This is a schematic diagram of the bionic variable-section rod unit designed with bamboo as inspiration.

[0052] Figure 2 Schematic diagram of a lattice structure unit cell constructed using variable-section rods in the present invention.

[0053] Figure 3 This is a schematic diagram of a variable cross-section unit structure obtained by crossing cubes from a lattice structure unit cell according to the present invention.

[0054] Figure 4 This is an enlarged diagram of the variable cross-section unit of the present invention being cut into a cube.

[0055] Figure 5 This is a schematic diagram of the ceramic lattice structure obtained by the variable cross-section unit array of the present invention.

[0056] Figure 6 Schematic diagram of the ceramic lattice structure obtained by the variable cross-section unit array of the present invention (multi-layer array formation)

[0057] Figure 7 This is a process diagram of a unit cell of a ceramic lattice structure with a size of 8×8×8 mm, which is composed of eight bionic variable-section rods of the same size established based on Example 5 of the present invention.

[0058] Figure 8 This is a maximum principal stress distribution diagram of a conventional cross-section lattice bionic lattice under a relative density of 20% during compression, taking Example 5 of the present invention as an example.

[0059] Figure 9This is a maximum principal stress distribution diagram of a bionic variable cross-section lattice with parameters of α=2.0 and β=0.45 during compression at a relative density of 20% according to Example 5 of the present invention.

[0060] Figure 10 This is a physical comparison diagram of a conventional structural ceramic lattice and a variable cross-section rod ceramic lattice at a relative density of 20%, taking Example 5 as an example.

[0061] Figure 11 These are stress-strain curves of the experiment and numerical simulation of the conventional cross-section lattice and the bionic variable cross-section lattice at a relative density of 20%, taking Example 5 as an example.

[0062] Figure 12 This is a structural diagram of the bionic variable-section rod design with different rod diameter variation parameters α and node length parameters β according to the present invention.

[0063] Figure 13 Graphs showing experimental and simulated stress-strain curves of ceramic lattices with different diameters and nodes of the present invention.

[0064] Figure 14 Graph showing the relationship between different node length parameters β and the compressive strength of the ceramic lattice according to the present invention.

[0065] Figure 15 Graph showing the relationship between different diameter variation parameters α and the compressive strength of the ceramic lattice according to the present invention. DETAILED DESCRIPTION

[0066] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0067] Example 1

[0068] like Figure 1-2 As shown, starting from the structural characteristics of bamboo, through analysis and abstraction of bamboo structure, the main structural elements are obtained and integrated with the concept of rod according to the principles of bionics, resulting in a bionic variable-section rod 100. Bionic variable-section rod 100 includes nodes 101 and internodes 102 arranged at intervals. Nodes 101 and internodes 102 are arranged at intervals and connected to form a rod body.

[0069] In this embodiment, the bionic variable-section rod 100 preferably includes a complete node 101, two internodes 102 connected at both ends of the node 101, and the ends of the two internodes 102 are both truncated by cubes, that is: the end of one internode 102 is cut into a plane by the center of the top surface of the cube, and the end of the other internode 102 is cut into three trihedral supports at right angles to each other by a corner of the cube.

[0070] The forming steps are as follows:

[0071] (1) Based on the principles of bionics and the structural characteristics of bamboo, the structural features and functions of bamboo were analyzed, and the characteristics of bamboo with a variable cross-section in the axial direction and the alternating distribution of nodes and internodes were extracted;

[0072] (2) Based on the characteristics of bamboo, the concept of bamboo rods in the lattice is integrated to design a bionic variable cross-section rod, and several key parameters that determine its structure are determined for structural construction and parameter optimization;

[0073] (3) Through three-dimensional modeling, a lattice structure unit cell is constructed using a bionic variable cross-section rod, and then the unit cell array is obtained into a ceramic lattice structure and its mechanical properties are tested using mechanical finite element numerical simulation software;

[0074] (4) Ceramic lattices were prepared using photocuring additive manufacturing technology and mechanical tests were performed to evaluate their performance.

[0075] like Figure 2 One end of the four bionic variable-section rods 100 is combined into a vertex 201, and the four corners of the other end are respectively located at the four corners of the cube to form a support foot 202. The vertex 201 is located at the center of one face of the cube and is flat. The support foot 202 is cut into three trihedrons with right angles to each other by a corner of the cube, thereby forming a lattice unit cell structure 200.

[0076] Example 2

[0077] like Figure 3 and 4 As shown, based on Example 1, a lattice unit cell structure 200 with a vertex 201 located at the top and a lattice unit cell structure 200 with a vertex 201 located at the bottom are symmetrically inverted and combined to form a variable cross-section unit 300 whose outer contour is located in a cube.

[0078] In the variable cross-section unit 300, the vertices 201 of the two lattice unit cell structures 200 are symmetrically arranged, and one is located at the center of the top surface of the cube, and the other is located at the center of the bottom surface of the cube, as shown in FIG. Figure 4 As shown in the cross section 301, the cross section 301 is one of three planes that form a right angle with each other. The cross sections 301-308 have the same structure and composition and will not be described in detail.

[0079] The adjacent multiple truncated surfaces are connected to form a joint surface 310. The multiple truncated surfaces are connected to form a variable cross-section node with multiple joint surfaces.

[0080] Example 3

[0081] Based on Examples 1 and 2, the variable cross-section unit 300 is extended along the xyz direction to form different variable cross-section rod ceramic lattice structures, such as Figure 5 shown.

[0082] Example 4

[0083] Based on Examples 1 and 2, Figure 6 As shown, more variable cross-section units 300 are extended along the xyz directions to form different variable cross-section rod ceramic lattice structures, such as Figure 6 shown.

[0084] More array lattice structures follow Figure 5 and Figure 6 The method is extended and no further details are given.

[0085] Example 5

[0086] like Figure 1 As shown, for the designed bionic variable cross-section rod 100, there are nodes and internodes distributed alternately and periodically on the rod, including the following 7 main parameters: the length l of a section of the rod, the maximum diameter d max , minimum diameter d min , node length l node and internode length l inter , rod diameter variation parameter α and node length parameter β.

[0087] The two structural parameters of the bionic variable cross-section rod are defined as follows:

[0088] The rod diameter variation parameter α is the ratio of the maximum diameter to the minimum diameter: α = d max / d min ;

[0089] The node length parameter β is the ratio of the node to the length of the single segment: β = l node / l;

[0090] In the above two structural parameter expressions, the segment length is l and the minimum diameter is d min , the node length is l node The node range along the length of the rod passes through (0.6α+0.4)d min The value range of α is [1.0, 2.5], and the value range of β is [0.15, 0.6].

[0091] In this embodiment, l=2.45 mm; d min =0.91mm;d max =1.82mm; l node =1.10mm; l inter =1.35mm; α=2.0; β=0.45.

[0092] Example 6

[0093] like Figure 1 As shown in the figure, for the designed bionic variable cross-section rod, there are nodes and internodes distributed alternately and periodically on the rod, including the following 7 main parameters: the length l of a section of the rod, the maximum diameter d max , minimum diameter d min , node length l node and internode length l inter , rod diameter variation parameter α and node length parameter β. Here we take l = 2.45mm; d min =0.99mm;d max =1.98mm; l node =0.73mm; l inter =1.72mm; α=2.0; β=0.30.

[0094] Example 7

[0095] like Figure 1 As shown in the figure, for the designed bionic variable cross-section rod, there are nodes and internodes distributed alternately and periodically on the rod, including the following 7 main parameters: the length l of a section of the rod, the maximum diameter d max , minimum diameter d min , node length l node and internode length l inter , rod diameter variation parameter α and node length parameter β. Here we take l = 2.45mm; d min =1.08mm;d max =2.16mm; l node =0.37mm; l inter =2.08mm; α=2.0; β=0.15.

[0096] Example 8

[0097] like Figure 1 As shown in the figure, for the designed bionic variable cross-section rod, there are nodes and internodes distributed alternately and periodically on the rod, including the following 7 main parameters: the length l of a section of the rod, the maximum diameter d max , minimum diameter d min , node length l node and internode length l inter , rod diameter variation parameter α and node length parameter β. Here we take l = 2.45mm; d min =1.10mm;d max =1.65mm; l node =0.73mm; l inter =1.72mm; α=1.5; β=0.30.

[0098] Example 9

[0099] like Figure 1 As shown in the figure, for the designed bionic variable cross-section rod, there are nodes and internodes distributed alternately and periodically on the rod, including the following 7 main parameters: the length l of a section of the rod, the maximum diameter d max , minimum diameter d min , node length l node and internode length l inter , rod diameter variation parameter α and node length parameter β. Here we take l = 2.45mm; d min =0.90mm;d max =2.25mm; l node =0.73mm; l inter =1.72mm; α=2.5; β=0.30.

[0100] Example 10

[0101] like Figure 7 As shown, based on Example 2, by performing operations such as copying, translating, rotating, and performing Boolean operations on the biomimetic variable-cross-section rods, a lattice structure unit cell with a size of 8×8×8mm was established according to a modified body-centered cubic configuration. The unit cells were arranged in a 3×3×3 array in space to form a periodic lattice structure with a size of 24×24×24mm. While maintaining the same relative density, the same operations were performed on conventional rods to obtain a regular cross-section lattice.

[0102] like Figure 8 and Figure 9 As shown, quasi-static compression numerical simulation was performed using finite element software to test the stress-strain curve and stress distribution of the lightweight ceramic lattice using bionic variable-section rods; Figure 8 This is a maximum principal stress distribution diagram of a conventional cross-sectional bionic lattice during compression at a relative density of 20% based on Example 2. Figure 9 The maxprincipal stress distribution diagram of the bionic variable cross-section lattice with parameters of α=2.0 and β=0.45 during compression based on Example 2 at a relative density of 20%.

[0103] A lightweight ceramic lattice model using bionic variable-section rods was established using 3D modeling software and saved as an STL file.

[0104] like Figure 10 As shown, taking Example 2 as an example, an STL file is imported into a light-curing 3D printer, a model embryo is printed using alumina slurry, and the embryo is converted into a dense ceramic through degreasing and sintering.

[0105] like Figure 11As shown in the figure, using Example 1 as an example, a quasi-static compression test was performed on a ceramic lattice fabricated using a stereolithography additive manufacturing technique to obtain its stress-strain curves, which were verified by numerical simulation results. The initial letter D represents density; the subscript 0 indicates a lattice composed of conventional rods, while the subscript 1 indicates a lattice composed of biomimetic variable-section rods; the middle number represents the percentage of relative density. In the four curves, the solid line represents the experimental result EXP, and the dashed line represents the numerical simulation result SIM.

[0106] like Figure 12 As shown, bionic variable cross-section rod designs with different rod diameter variation parameters α and node length parameters β can be constructed.

[0107] like Figure 13-15 As shown, Figure 13 (a) to (g) are experimental and simulated stress-strain curves of ceramic lattices with different diameter change parameters α and different node length parameters β.

[0108] from Figure 13-15 Experimental and simulated stress-strain curves for ceramic lattices with varying diameter variation parameters α and node length parameters β are presented, along with the relationships between these parameters and compressive strength. The results demonstrate a strong correlation between the compressive strength of the ceramic lattice and its structural parameters, demonstrating that ceramic lattices employing biomimetic variable-section rods are designable and customizable, from structure to performance.

[0109] A quasi-static compression test was performed on a ceramic lattice fabricated using a stereolithography (SLA) additive manufacturing (SLM) process to obtain its stress-strain curve. The quasi-static compression test was conducted in accordance with GB / T 1964-2023, using a displacement-controlled mode, a loading rate of 0.5 mm / min, and a specimen size of 24 × 24 × 24 mm.

[0110] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all such improvements and changes should fall within the scope of protection of the appended claims of the present invention.

Claims

1. A ceramic bionic variable cross-section rod, characterized in that: It comprises at least one complete node and two internodes connected at both ends of the node; the nodes and internodes are alternately distributed periodically and connected in straight lines to form a rod body, and the node cross section is larger than the internode cross section, so that the rod body is thin in the middle and thick at both ends.

2. The ceramic bionic variable cross-section rod according to claim 1, characterized in that: One internode end is cut into a plane by the center of the top surface of the cube, and the other internode end is cut into a trihedron with three right-angled faces by a corner of the bottom surface of the cube.

3. A bionic variable cross-section rod-based ceramic lattice structure, characterized by: A ceramic bionic variable cross-section rod according to claim 1 or 2; One end of four ceramic bionic variable-section rods of the same size are combined into a vertex, and the vertex is located at the center of a top surface of the cube and is flat; The other ends of each rod are located at the four corners of the bottom surface of the cube to form supporting feet; Each support leg is cut into three trihedrons with faces at right angles to each other by cutting a corner of the bottom surface of the cube, thereby forming a lattice ceramic unit cell structure.

4. The bionic variable cross-section rod-based ceramic lattice structure according to claim 3, characterized in that: A lattice ceramic unit cell structure with its vertex located on the top surface and a lattice ceramic unit cell structure of the same size with its vertex located on the bottom surface are symmetrically inverted and combined in a cube with its outer contour located between the bottom and top surfaces to form a ceramic lattice variable cross-section unit.

5. A bionic variable cross-section rod-based ceramic lattice structure, characterized by: The method comprises at least two ceramic lattice variable cross-section units as described in claim 4.

6. A method for preparing a rod-based ceramic lattice structure with a bionic variable cross-section, characterized in that include: By modifying the length and diameter of the nodes and internodes, a ceramic bionic variable-section rod is obtained, wherein the bionic variable-section rod comprises at least one complete node and two internodes connected at both ends of the node, wherein the node and the internodes are spaced and connected to form a rod body; the node cross-section is larger than the internode cross-section; By copying, translating, rotating and performing Boolean operations on the bionic variable-section rods, a lattice structure unit cell consisting of four or eight bionic variable-section rods of the same size is established according to the modified body-centered cubic configuration. The lattice structure unit cells are arrayed in space to obtain a periodic ceramic lattice structure.

7. The method for preparing a rod-based ceramic lattice structure with a bionic variable cross-section according to claim 6, characterized in that One end of four bionic variable-section rods of the same size are combined to form a vertex, which is located at the center of a top surface of the cube and is flat; the other end of each rod is located at the four corners of the bottom surface of the cube to form a support foot, and each support foot is cut into three truncated trihedrons with right angles to each other by a corner of the bottom surface of the cube, thus forming a lattice structure unit cell.

8. The method for preparing a rod-based ceramic lattice structure with a bionic variable cross-section according to claim 6, characterized in that According to the nodes and internodes distributed in an alternating period, a bionic variable-section rod is obtained by modifying the length and diameter of each node and internode.

9. The method for preparing a rod-based ceramic lattice structure with a bionic variable cross-section according to claim 6, characterized in that Ceramic lattices with variable cross-section microstructure features are prepared using advanced additive manufacturing processes.

10. An application of a bionic variable cross-section rod-based ceramic lattice structure, characterized in that Vibration-damping and explosion-proof materials used in aerospace, shipbuilding, metallurgy and chemical industries.

Images