A high-strength, high-temperature resistant quartz cloth honeycomb core and its preparation method

Abstract

This invention provides a high-strength, high-temperature resistant quartz cloth honeycomb core, relating to the field of composite new materials technology. The honeycomb core includes a core body and a silicon carbide composite layer formed on the surface of the core body. The core body is formed by bonding multiple layers of quartz cloth together, with adjacent layers forming multiple spaced through-holes with a regular hexagonal cross-section. The silicon carbide composite layer is a composite of silicon carbide and resin; wherein the mass ratio of resin to silicon carbide in the silicon carbide composite layer is 25–70:0.5–5. This product uses quartz fiber cloth as the main body, then sprays on the silicon carbide and resin composite, and cures it. It can improve the mechanical properties of the honeycomb core by 25% without changing the product density and effectively improve the high-temperature resistance of the honeycomb core.

Description

Technical Field

[0001] This invention relates to the field of composite materials technology, and in particular to a high-strength, high-temperature resistant quartz cloth honeycomb core and its preparation method. Background Technology

[0002] Honeycomb core is a sheet-like columnar body with a regular hexagonal cross-section formed by folding and bonding sheet materials. Due to its good mechanical properties, high strength, light weight, and characteristics such as being pollution-free and easy to recycle, it is being widely used as a reinforcing core material for various sheet materials, replacing materials such as foam plastics.

[0003] Aramid paper honeycomb cores have long been widely used in the aerospace industry, but these cores cannot be used for extended periods at temperatures exceeding 150°C, nor for short periods at temperatures exceeding 300°C. In recent years, with the development of next-generation aerospace vehicles, there have been clear requirements for the mature application of composite materials in high-temperature environments. Glass fiber cloth, with its superior heat resistance, has replaced general aramid paper. However, in the production of glass fiber cloth honeycomb cores, polyimide resin has consistently been used as the reinforcing material. While the heat resistance of polyimide resin is maintained in the finished glass fiber cloth honeycomb product, its overall mechanical properties are not outstanding. Although there are currently no industry standards specifying the performance requirements for high-temperature resistant honeycomb core products, facing increasingly demanding operating environments, honeycomb core materials need to meet higher mechanical performance indicators in addition to heat resistance. How to produce high-temperature resistant honeycomb cores with higher specific strength and specific stiffness has become a key focus of industry research. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a high-strength, high-temperature resistant quartz cloth honeycomb core and its preparation method.

[0005] The technical problem solved by this invention is achieved by the following technical solution.

[0006] A first aspect of the present invention provides a high-strength, high-temperature resistant quartz cloth honeycomb core, the honeycomb core comprising a core body and a silicon carbide composite layer formed on the surface of the core body, the core body being formed by bonding multiple layers of quartz cloth together, and adjacent layers of quartz cloth forming a plurality of spaced through holes with a cross-section of regular hexagons; the silicon carbide composite layer being a composite of silicon carbide and resin; wherein, in the silicon carbide composite layer, the mass ratio of resin to silicon carbide is 25-70:0.5-5.

[0007] A second aspect of the present invention provides a method for preparing the high-strength, high-temperature resistant quartz cloth honeycomb core described above, comprising:

[0008] S1, providing a multilayer quartz cloth, said quartz cloth being woven from quartz glass fibers;

[0009] S2, forming spaced adhesive strips on each layer of the quartz cloth, the width of the adhesive strip being half the distance between two adjacent adhesive strips;

[0010] S3, the quartz cloth after applying the adhesive is stacked in sequence, and the adhesive strips of the two adjacent layers of quartz cloth are staggered, and the adhesive strips between the two adjacent layers of quartz cloth are staggered at equal intervals;

[0011] S4, hot-press the multi-layered quartz cloth after stacking to obtain a honeycomb stack;

[0012] S5. After boiling the honeycomb stack for a certain period of time, stretch it until it forms a honeycomb core, dry and shape it to obtain a honeycomb core blank.

[0013] S6, Spray the silicon carbide / resin composite material onto the surface of the honeycomb core blank, then cure and cut it to obtain a high-strength, high-temperature resistant quartz cloth honeycomb core;

[0014] The silicon carbide / resin composite material includes silicon carbide powder, resin, and organic solvent.

[0015] In one embodiment of the present invention, step S6 includes the following steps: placing the silicon carbide / resin composite material in a stirring spray tank with a porous nozzle, spraying the silicon carbide / resin composite material onto the surface of the honeycomb core preform through the porous nozzle, and ensuring that the honeycomb core preform is in a rotating state during the spraying process.

[0016] In one embodiment of the present invention, after step S5 and before step S6, a surface treatment is performed on the honeycomb core preform. The surface treatment step includes: subjecting the honeycomb core preform to corona treatment, applying a voltage of 100-160V for 15-35s.

[0017] In one embodiment of the present invention, the silicon carbide powder comprises a first particle with a median particle size of 1 to 3 μm, a second particle with a median particle size of 100 to 300 nm, and a third particle with a median particle size of 20 to 50 nm, wherein the mass ratio of the first particle, the second particle, and the third particle is 10:2 to 3:4 to 6.

[0018] In one embodiment of the present invention, the method for preparing the silicon carbide / resin composite material includes:

[0019] Polyimide resin was added to an organic solvent, stirred, and then silicon carbide powder was added. After mixing, the first resin solution was obtained.

[0020] Functional additives and alkoxysilanes are added to an organic solvent, stirred, and then polyaspartic acid ester resin and curing agent are added. After heating for a period of time, a second resin liquid is obtained.

[0021] The first resin liquid is added to the second resin liquid, and after mixing, vacuum degassing is performed to obtain the silicon carbide / resin composite material.

[0022] In one embodiment of the present invention, the silicon carbide powder is modified silicon carbide powder, and the preparation process of the modified silicon carbide powder includes: dispersing silicon carbide powder in gallic acid solution, then adding ferric chloride solution, and ultrasonically reacting for 5 to 20 minutes to obtain modified silicon carbide powder.

[0023] In one embodiment of the present invention, the functional additive is selected from one or more of expanded perlite, porous starch, vermiculite and calcium sulfate whiskers.

[0024] In one embodiment of the present invention, the adhesive strip is a polyimide adhesive.

[0025] In one embodiment of the present invention, step S5, the drying and shaping step includes: removing water from the stretched product at 30-50°C for 48-72 hours, and then keeping it at 260-300°C for 120-180 minutes.

[0026] The beneficial effects of the high-strength, high-temperature resistant quartz cloth honeycomb core and its preparation method of the present invention are as follows:

[0027] Quartz fiber is a special type of glass fiber made from high-purity silica and natural quartz crystals, with a silica content of over 99.8%. It possesses advantages such as high strength, high temperature resistance, and corrosion resistance. The high-strength, high-temperature resistant honeycomb core of this invention uses quartz cloth as the base material, exhibiting excellent mechanical and high-temperature properties, making it suitable for applications in aerospace and other fields. By spraying a silicon carbide / resin composite onto the surface of the honeycomb core blank, a silicon carbide composite layer is formed on the honeycomb core surface after curing. The silicon carbide material is adsorbed into the pores of the quartz cloth, improving the product's mechanical properties by over 25% without changing the honeycomb core density, while also providing excellent high-temperature resistance. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1A flowchart illustrating the preparation method of a high-strength, high-temperature resistant quartz cloth honeycomb core provided in an embodiment of the present invention;

[0030] Figure 2 A schematic diagram illustrating the preparation process of the high-strength, high-temperature resistant quartz cloth honeycomb core provided in an embodiment of the present invention;

[0031] Figure 3 This is a schematic diagram of the structure of the stirring spray tank provided in an embodiment of the present invention;

[0032] Figure 4 This is a schematic diagram of the high-strength, high-temperature resistant quartz cloth honeycomb core according to an embodiment of the present invention. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall apply. Reagents or instruments whose manufacturers are not specified are all conventional products that can be purchased commercially.

[0034] The following is a detailed description of the high-strength, high-temperature resistant quartz cloth honeycomb core and its preparation method according to embodiments of the present invention.

[0035] This invention provides a method for preparing a high-strength, high-temperature resistant quartz cloth honeycomb core, comprising the following steps:

[0036] S1, Obtain multi-layer quartz, wherein the quartz cloth is woven from quartz fibers;

[0037] S2, forming spaced adhesive strips on each layer of the quartz cloth, the width of the adhesive strip being half the distance between two adjacent adhesive strips;

[0038] S3, the quartz cloth after applying the adhesive is stacked in sequence, and the adhesive strips of the two adjacent layers of quartz cloth are staggered, and the adhesive strips between the two adjacent layers of quartz cloth are staggered at equal intervals;

[0039] S4, hot-press the multi-layered quartz cloth after stacking to obtain a honeycomb laminate;

[0040] S5. After boiling the honeycomb stack for a certain period of time, stretch it until it forms a honeycomb core, dry and shape it to obtain a honeycomb core blank.

[0041] S6, Spray the silicon carbide / resin composite material onto the surface of the honeycomb core blank, then cure and cut it to obtain a high-strength, high-temperature resistant quartz cloth honeycomb core;

[0042] The silicon carbide / resin composite material includes silicon carbide powder, resin, and organic solvent.

[0043] In step S1, a multilayer quartz cloth is obtained, which is woven from quartz fibers. Specifically, quartz fibers are special glass fibers, and the cloth roll formed by weaving quartz fibers is quartz cloth. The specific structure of quartz cloth is prior art in this field and will not be described in detail here. Using quartz cloth as the substrate of the honeycomb core provides excellent high-temperature resistance.

[0044] In step S2, spaced adhesive strips are formed on each layer of the quartz cloth. The width of each adhesive strip is half the distance between two adjacent adhesive strips. In this embodiment, the adhesive strips are arranged in a strip shape, with the direction in which the adhesive strips are spaced apart defined as the width direction and the direction in which the adhesive strips extend defined as the length direction. The width direction is perpendicular to the length direction.

[0045] Specifically, in this embodiment, the adhesive strip is made of polyimide adhesive, which is available as a commercially available product. Using polyimide adhesive results in better bonding and superior high-temperature resistance.

[0046] In step S3, the coated quartz cloths are stacked sequentially, with the adhesive strips of adjacent layers of quartz cloth staggered, and the adhesive strips between adjacent layers of quartz cloth staggered at equal intervals. By controlling the position of the adhesive strips between adjacent layers of quartz cloth, a honeycomb core structure of a predetermined size is obtained. Preferably, in this embodiment, the side length of the regular hexagonal honeycomb core is controlled to be 3mm.

[0047] In step S4, the stacked multilayer quartz cloth is hot-pressed to obtain a honeycomb stack. Specifically, for example, hot pressing can be performed using a hot press. Preferably, in this embodiment, the hot pressing process involves: first hot pressing at 120–180°C for 30–90 minutes at a pressure of 0.2–0.4 MPa, and then hot pressing at 220–260°C for 5–10 hours at a pressure of 1.1–1.5 MPa. By first hot pressing at a lower temperature, the quartz cloth and polyimide adhesive are pre-fixed, and then hot-pressed under high temperature and pressure for curing, the bonding effect between the multilayer quartz cloths can be effectively improved, thus enhancing the product strength.

[0048] Furthermore, in one embodiment, the process after step S4 and before step S5 further includes: trimming the honeycomb stack to obtain a honeycomb stack of a predetermined width. Specifically, the honeycomb stack can be cut according to the design width requirements to ensure that the dimensions of the honeycomb stack meet the requirements.

[0049] In step S5, the honeycomb stack is boiled for a certain period of time, then stretched until a honeycomb core is formed, and dried and shaped to obtain the honeycomb core blank. Specifically, the honeycomb core stack is boiled in boiling water for 18-24 hours. After boiling, it is stretched, and when the stretched honeycomb cells reach the required dimensions, the stretched product is placed in an oven for drying and shaping.

[0050] By thoroughly soaking in boiling water, impurities on the surface of the quartz cloth can be removed, and the quartz cloth can be softened, the wettability of the fibers can be improved, which facilitates the subsequent stretching process and enhances the adsorption capacity with silicon carbide / resin composite materials.

[0051] Furthermore, the drying and shaping step in this process includes: dehydrating the stretched product at 30–50°C for 48–72 hours, and then holding it at 260–300°C for 120–180 minutes. Performing the dehydration operation at a lower temperature first, followed by baking at a higher temperature, effectively ensures the stability of the honeycomb core structure and improves the product strength.

[0052] Furthermore, in this embodiment, after step S5 and before step S6, a surface treatment of the honeycomb core blank is included. This surface treatment step includes: subjecting the honeycomb core blank to corona treatment, applying a voltage of 100-160V for 15-35 seconds. Specifically, the honeycomb core blank is placed in a corona treatment device, and high-frequency, high-voltage corona discharge is used on the product surface to generate low-temperature plasma. This surface treatment forms a rough structure and active groups on the surface of the honeycomb core blank, thereby enabling better bonding with the silicon carbide / resin composite material, resulting in better bonding stability and superior mechanical and high-temperature resistance properties.

[0053] In step S6, the silicon carbide / resin composite material is sprayed onto the surface of the honeycomb core preform, then cured and cut to obtain a high-strength, high-temperature resistant quartz cloth honeycomb core.

[0054] In this embodiment, the silicon carbide / resin composite material includes silicon carbide powder, resin, and organic solvent. Specifically, the preparation method of the silicon carbide / resin composite material includes: adding polyimide resin to an organic solvent, stirring, adding silicon carbide powder, and mixing to obtain a first resin liquid; adding functional additives and alkoxysilane to an organic solvent, stirring, adding polyaspartic acid ester resin and a curing agent, heating for a period of time to obtain a second resin liquid; adding the first resin liquid to the second resin liquid, mixing, and then performing vacuum degassing treatment to obtain the silicon carbide / resin composite material.

[0055] Furthermore, in one embodiment, the organic solvent may be one or more of ethanol, acetone, ethyl acetate, propylene glycol methyl ether, methyl isobutyl ketone, etc.

[0056] Furthermore, in one embodiment, the functional additive is selected from one or more of self-expanded perlite, porous starch, vermiculite, and calcium sulfate whiskers. More preferably, the functional additive is selected from expanded perlite, porous starch, and vermiculite in a mass ratio of 1:3 to 5:1. By adding the above-mentioned functional additives and alkoxysilanes, the strength and fire resistance of the product can be further improved. In addition, the porous structure of the above materials can improve the sound absorption performance of the product and enhance the noise reduction effect.

[0057] Furthermore, in one embodiment, the alkoxysilane may be selected from one or more of 3-aminopropyltriethoxysilane, propyltrimethoxysilane, and methyltrimethoxysilane. The curing agent may be an isocyanate curing agent.

[0058] Furthermore, in one embodiment, the ratio of silicon carbide powder, polyimide resin, and polyaspartic acid ester resin in the silicon carbide / resin composite material is 0.5–5:15–60:10. By adjusting the amount of the two resins added, modified resin structures with different compounding ratios are obtained. Introducing aspartic polyurea into the polyimide resin introduces a microphase separation structure into the resin matrix. The high bond energy of the urea bonds enables stress dispersion and absorption, further improving the impact resistance and strength properties of the honeycomb core material.

[0059] Furthermore, in one embodiment, the ratio of silicon carbide powder to functional additives in the silicon carbide / resin composite material is 1:1 to 4. Through the synergistic effect of these various materials, the strength, stiffness, and other properties of the product are effectively improved.

[0060] Furthermore, in one embodiment, vacuum degassing is performed in a vacuum degassing machine for 5–10 minutes. Vacuum degassing effectively removes air bubbles from the material, achieving homogenization.

[0061] Furthermore, in one embodiment, the silicon carbide powder comprises a first particle with a median particle size of 1–3 μm, a second particle with a median particle size of 100–300 nm, and a third particle with a median particle size of 20–50 nm, wherein the mass ratio of the first, second, and third particles is 10:2–3:4–6. By compounding silicon carbide powders of different particle sizes, the dispersion performance of silicon carbide in the resin matrix can be improved, and agglomeration can be reduced. In addition, by dispersing particles of different sizes in the resin matrix, different contact areas are formed with the resin matrix, and the compounding of large and small particles is more conducive to improving the strength and high-temperature resistance of the product.

[0062] Further, in one embodiment, the silicon carbide powder is modified before use to obtain modified silicon carbide powder. The preparation process of modified silicon carbide powder includes: dispersing silicon carbide powder in gallic acid solution, then adding ferric chloride solution, ultrasonically reacting for 5-20 min, separating, and drying to obtain modified silicon carbide powder. Specifically, the mass fraction of silicon carbide powder in gallic acid solution is 10-20%. The molar ratio of ferric chloride solution to gallic acid solution is 1-5:1.

[0063] The above modification process involves gallic acid and Fe 3+ The chelation and cross-linking effect forms functional groups on the surface of silicon carbide. On the one hand, these groups can be well dispersed in the matrix solution, and on the other hand, they can chemically bond with the resin matrix, thereby improving the binding ability with the resin matrix and preventing migration.

[0064] Further, in step S6, refer to Figure 3 As shown, the spraying process includes: placing the silicon carbide / resin composite material in a stirred spray tank 30 equipped with a porous nozzle 31, and spraying the silicon carbide / resin composite material onto the surface of the honeycomb core preform through the porous nozzle 31, while ensuring that the honeycomb core preform is in a rotating state during the spraying process. Specifically, a stirring paddle (not shown) is installed in the stirred spray tank 30, and the spraying operation is performed while stirring. The honeycomb core preform is placed on a rotating platform, and the rotating platform drives the preform to rotate, so as to ensure the formation of a uniform silicon carbide composite layer on the surface of the honeycomb core.

[0065] Furthermore, in this step, the sprayed honeycomb core preform is cured at a temperature of 350–380°C for 120–360 minutes.

[0066] This invention also provides a high-strength, high-temperature resistant quartz cloth honeycomb core, prepared according to the method described above. The prepared honeycomb core includes a core body and a silicon carbide composite layer formed on the surface of the core body. The core body is formed by bonding multiple layers of quartz cloth together, and adjacent layers of quartz cloth form multiple spaced through holes with a regular hexagonal cross-section. The silicon carbide composite layer is a composite of silicon carbide and resin; wherein, in the silicon carbide composite layer, the mass ratio of resin to silicon carbide is 25-70:0.5-5.

[0067] The features and performance of the present invention will be further described in detail below with reference to embodiments.

[0068] Example 1

[0069] See Figure 2 As shown, this embodiment provides a high-strength, high-temperature resistant quartz cloth honeycomb core, which is obtained through the following steps:

[0070] (1.1) Material preparation: Prepare multi-layer quartz cloth, which is woven from quartz fibers;

[0071] (1.2) Applying adhesive: Apply strips of adhesive to each layer of quartz cloth. The width of the adhesive strip is 3cm and the spacing between two adjacent adhesive strips is 6cm.

[0072] (1.3) Overlapping: The quartz cloth after applying the adhesive is overlapped in sequence, and the adhesive strips of the two adjacent layers of quartz cloth are staggered, and the adhesive strips between the two adjacent layers of quartz cloth are staggered at equal intervals.

[0073] (1.4) Hot pressing: The multilayer quartz cloth after lamination is hot-pressed at 150℃ for 60 minutes at a pressure of 0.3 MPa, and then hot-pressed at 250℃ for 8 hours at a pressure of 1.2 MPa. A honeycomb laminate is obtained; the honeycomb laminate is then trimmed according to the designed width.

[0074] (1.5) Stretching: The honeycomb stack after trimming is boiled in boiling water for 20 hours and stretched until it forms a honeycomb core. Then, it is dehydrated at 40°C for 60 hours and kept at 280°C for 160 minutes to obtain the honeycomb core blank.

[0075] (1.6) Spraying: The silicon carbide / resin composite material is loaded into the mixing spray tank, and the silicon carbide / resin composite material is sprayed onto the surface of the honeycomb core blank through the nozzle while stirring. During the spraying process, the honeycomb core blank is kept in a rotating state.

[0076] (1.7) Curing: The sprayed honeycomb core preform is cured at 360℃ for 240 min. After curing, a uniform silicon carbide composite layer is formed on the honeycomb core preform.

[0077] (1.8) Slicing: The cured honeycomb core blank is processed on a special honeycomb slicing machine to obtain a high-strength, high-temperature resistant quartz cloth honeycomb core that meets the design height requirements.

[0078] The preparation method of silicon carbide / resin composite material is as follows:

[0079] (2.1) Pretreatment of silicon carbide powder: 2 parts by weight of silicon carbide powder were dispersed in 10 parts by weight of gallic acid solution (concentration of 2 mol / L), and ultrasonicated for 3 min. Then, 10 parts by weight of ferric chloride solution (concentration of 6 mol / L) were added, ultrasonicated for 10 min, filtered and separated, and dried in an oven to obtain modified silicon carbide powder.

[0080] (2.2) Preparation of mixture A: 60 parts by weight of polyimide resin were added to 40 parts by weight of acetone, stirred at 800 rpm for 30 min, 2 parts by weight of modified silicon carbide powder with a median particle size of 300 nm were added, and the mixture was sonicated for 15 min to obtain mixture A.

[0081] (2.3) Preparation of mixture B: 0.5 parts by weight of expanded perlite, 2 parts by weight of porous starch and 0.5 parts by weight of methyltrimethoxysilane were added to 5 parts by weight of acetone and stirred for 30 min. Then, 10 parts by weight of polyaspartic acid ester resin and 3 parts by weight of isocyanate curing agent were added. Mixture B was obtained after stirring for 2 h in an oil bath at 80 °C.

[0082] (2.4) Mixing and degassing: Add mixture A to mixture B, stir at 1200 rpm for 30 min, and then place in a vacuum degassing machine for 8 min to obtain silicon carbide / resin composite material.

[0083] Example 2

[0084] This embodiment provides a high-strength, high-temperature resistant quartz cloth honeycomb core, which differs from Embodiment 1 in that: before steps (1.5) and (1.6), it further includes: placing the honeycomb core blank obtained in step (1.5) in a corona discharge device, applying a voltage of 160V for 15s.

[0085] Example 3

[0086] This embodiment provides a high-strength, high-temperature resistant quartz cloth honeycomb core, which differs from Embodiment 1 in that: in the preparation process of silicon carbide / resin composite material, the modified silicon carbide powder in step (2.2) includes modified silicon carbide powder with median particle sizes of 2μm, 300nm and 50nm, and the amounts used are 1.2 parts by weight, 0.3 parts by weight and 0.5 parts by weight, respectively.

[0087] Example 4

[0088] This embodiment provides a high-strength, high-temperature resistant quartz cloth honeycomb core, which differs from Embodiment 1 in that: in the preparation process of silicon carbide / resin composite material, step (2.3) preparation of mixture B: 0.5 parts by weight of expanded perlite, 2 parts by weight of porous starch and 0.5 parts by weight of methyltrimethoxysilane are added to 5 parts by weight of acetone and stirred for 30 minutes to obtain mixture B.

[0089] Example 5

[0090] This embodiment provides a high-strength, high-temperature resistant quartz cloth honeycomb core, which differs from Embodiment 1 in that: in the preparation process of silicon carbide / resin composite material, step (2.3) preparation of mixture B: 0.5 parts by weight of methyltrimethoxysilane is added to 5 parts by weight of acetone, stirred for 30 min, then 10 parts by weight of polyaspartic acid ester resin and 3 parts by weight of isocyanate curing agent are added, and mixture B is obtained after stirring for 2 h in an oil bath at 80°C.

[0091] Comparative Example 1

[0092] This comparative example provides a quartz cloth honeycomb core, which differs from Example 1 in that:

[0093] Step (1.6) Spraying: The resin material is loaded into the stirring spray tank, and the silicon carbide / resin composite material is sprayed onto the surface of the honeycomb core preform through the nozzle while stirring. During the spraying process, the honeycomb core preform is kept in a rotating state. The resin material is a mixture of 70 parts by weight of polyimide resin and 45 parts by weight of acetone. The spraying amount is the same as in Example 1.

[0094] Comparative Example 2

[0095] This comparative example provides a quartz cloth honeycomb core, which differs from Example 1 in that:

[0096] The preparation method of silicon carbide / resin composite material is as follows: 70 parts by weight of polyimide resin are added to 45 parts by weight of acetone, stirred at 800 rpm for 30 min, 2 parts by weight of silicon carbide powder with a median particle size of 300 nm are added, ultrasonicated for 15 min, and then placed in a vacuum degassing machine for 8 min to obtain silicon carbide / resin composite material.

[0097] Experimental Example 1

[0098] Compression test specimens were prepared from the quartz cloth honeycomb cores of Examples 1-4 and Comparative Examples 1-2, with a specimen size of 60 mm × 60 mm. The compression test specimens were placed at temperatures of 30°C, 200°C, and 350°C for 48 hours, respectively, before being tested.

[0099] The embodiments described above are some, but not all, embodiments of the present invention. The detailed description of the embodiments of the present invention is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

Claims

1. A high-strength, high-temperature resistant quartz cloth honeycomb core, characterized in that, The honeycomb core includes a core body and a silicon carbide composite layer formed on the surface of the core body. The core body is formed by bonding multiple layers of quartz cloth together, and adjacent layers of quartz cloth form multiple spaced through holes with a cross-section of regular hexagons. The silicon carbide composite layer is a composite of silicon carbide and resin. The mass ratio of resin to silicon carbide in the silicon carbide composite layer is 25–70:0.5–5. The silicon carbide composite layer is formed by spraying and curing a silicon carbide / resin composite material. The preparation method of the silicon carbide / resin composite material includes: adding polyimide resin to an organic solvent, stirring, adding silicon carbide powder, and mixing to obtain a first resin liquid; adding functional additives and alkoxysilane to an organic solvent, stirring, adding polyaspartic acid ester resin and a curing agent, heating for a period of time to obtain a second resin liquid; adding the first resin liquid to the second resin liquid, mixing, and then performing vacuum degassing treatment to obtain the silicon carbide / resin composite material. The silicon carbide powder is a modified silicon carbide powder. The preparation process of the modified silicon carbide powder includes: dispersing silicon carbide powder in gallic acid solution, then adding ferric chloride solution, and ultrasonically reacting for 5 to 20 minutes to obtain modified silicon carbide powder; the functional additives are selected from expanded perlite, porous starch and vermiculite in a mass ratio of 1:3 to 5:

1.

2. A method for preparing a high-strength, high-temperature resistant quartz cloth honeycomb core as described in claim 1, characterized in that, include: S1, providing a multilayer quartz cloth, said quartz cloth being woven from quartz glass fibers; S2, forming spaced adhesive strips on each layer of the quartz cloth, the width of the adhesive strip being half the distance between two adjacent adhesive strips; S3, the quartz cloth after applying the adhesive is stacked in sequence, and the adhesive strips of the two adjacent layers of quartz cloth are staggered, and the adhesive strips between the two adjacent layers of quartz cloth are staggered at equal intervals; S4, hot-press the multi-layered quartz cloth after stacking to obtain a honeycomb stack; S5. After boiling the honeycomb stack for a certain period of time, stretch it until it forms a honeycomb core, dry and shape it to obtain a honeycomb core blank. S6, the silicon carbide / resin composite material is sprayed onto the surface of the honeycomb core blank, then cured and cut to obtain a high-strength, high-temperature resistant quartz cloth honeycomb core; wherein, the silicon carbide / resin composite material includes silicon carbide powder, resin and organic solvent; The process includes surface treatment of the honeycomb core preform after step S5 and before step S6. This surface treatment includes corona treatment of the honeycomb core preform with a voltage of 100-160V for 15-35 seconds. The preparation method of the silicon carbide / resin composite material includes: adding polyimide resin to an organic solvent, stirring, adding silicon carbide powder, and mixing to obtain a first resin liquid; adding functional additives and alkoxysilane to an organic solvent, stirring, adding polyaspartic acid ester resin and a curing agent, and heating for a period of time to obtain a second resin liquid; adding the first resin liquid to the second resin liquid, mixing, and then performing vacuum degassing treatment to obtain the silicon carbide / resin composite material. The silicon carbide powder is a modified silicon carbide powder. The preparation process of the modified silicon carbide powder includes: dispersing silicon carbide powder in gallic acid solution, then adding ferric chloride solution, and ultrasonically reacting for 5 to 20 minutes to obtain modified silicon carbide powder; the functional additives are selected from expanded perlite, porous starch and vermiculite in a mass ratio of 1:3 to 5:

1.

3. The method for preparing a high-strength, high-temperature resistant quartz cloth honeycomb core according to claim 2, characterized in that, In step S6, the spraying process includes: placing the silicon carbide / resin composite material in a stirring spray tank with a porous nozzle, spraying the silicon carbide / resin composite material onto the surface of the honeycomb core preform through the porous nozzle, and ensuring that the honeycomb core preform is in a rotating state during the spraying process.

4. The method for preparing a high-strength, high-temperature resistant quartz cloth honeycomb core according to claim 2, characterized in that, The silicon carbide powder includes a first particle with a median particle size of 1 to 3 μm, a second particle with a median particle size of 100 to 300 nm, and a third particle with a median particle size of 20 to 50 nm, wherein the mass ratio of the first particle, the second particle, and the third particle is 10:2 to 3:4 to 6.

5. The method for preparing a high-strength, high-temperature resistant quartz cloth honeycomb core according to claim 2, characterized in that, The adhesive strip is a polyimide adhesive.

6. The method for preparing a high-strength, high-temperature resistant quartz cloth honeycomb core according to claim 2, characterized in that, In step S5, the drying and shaping step includes: removing water from the stretched product at 30-50°C for 48-72 hours, and then keeping it at 260-300°C for 120-180 minutes.

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