A preparation method for improving temperature resistance of a composite material outer adjusting piece
By employing a gradient layup design of carbon fiber and glass fiber prepreg on the external adjustment strip of an aero-engine, the problem of interlayer delamination of composite materials under high-temperature environments has been solved, thereby improving the gradient temperature resistance of the material and making it suitable for the aerospace field.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- AVIC BEIJING INST OF AERONAUTICAL MATERIALS
- Filing Date
- 2024-11-07
- Publication Date
- 2026-06-09
AI Technical Summary
In high-temperature environments, the composite material outer adjustment plate of aero-engines may experience delamination due to localized bulging, affecting its reliability and mechanical properties.
The design employs a gradient layup of carbon fiber and glass fiber prepregs on an outer conditioning sheet. Gradual temperature resistance is achieved through wet preparation and hot pressing processes. The carbon fiber prepreg is placed in the front section, and the glass fiber prepreg is placed in the back section. The thickness and ratio can be adjusted as needed, and the curing temperature is between 350℃ and 400℃.
The temperature resistance of the external regulating plate has been improved to meet the gradually increasing temperature requirements from the head to the tail, enhancing the temperature resistance of the material and resulting in significant weight reduction, making it suitable for the aerospace field.
Smart Images
Figure CN119427888B_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of composite material technology and relates to a method for preparing an external temperature-regulating plate for improving the temperature resistance of composite materials. Background Technology
[0002] Resin-based composite materials have attracted widespread attention due to their designability, high specific strength, and light weight, and have important applications in various fields such as wind turbine blades, large aircraft, and next-generation aerospace vehicles. Currently, resin-based composite materials are increasingly used in aero engines and are also beginning to be used in external control plates.
[0003] During test runs, the temperature of the inner surface of the composite material outer control plate of an aero-engine rises due to the heat flow from the exhaust nozzle, resulting in localized bulging. The short-term high-temperature environment causes the composite resin to soften rapidly and lose interlayer bonding force, leading to interlayer delamination and the phenomenon of bulging on the inner surface. This causes a decrease in the mechanical properties of the composite material, such as strength, and affects the reliability of the composite material outer control plate.
[0004] High-strength glass fiber has low thermal conductivity, excellent thermal insulation performance, and high-temperature stability. It can be used as a thermal insulation layer in composite materials in high-temperature environments, making it an ideal material for improving the temperature resistance of composite materials. Summary of the Invention
[0005] To address the aforementioned problems, the present invention aims to provide a method for preparing an improved temperature resistance of an outer regulating plate made of composite materials. This method is simple, and the temperature resistance of the outer regulating plate can be gradually increased along its length, thus meeting the requirements of the material's temperature resistance as the external temperature gradually increases from the head to the tail of the outer regulating plate.
[0006] To achieve the above objectives, the present invention provides a method for preparing an improved temperature resistance sheet for composite materials, comprising the following steps: First, carbon fiber prepreg is prepared by wet process using polyimide resin solution and carbon fiber, and glass fiber prepreg is prepared by the same method using polyimide resin solution and glass fiber; the front section of the outer regulating sheet uses carbon fiber prepreg and the rear section uses glass fiber prepreg, the thickness of the carbon fiber prepreg is 0.10-0.15 mm, and the thickness of the glass fiber prepreg is 0.20-0.30 mm. During the laying process, for every 2-3 layers of carbon fiber prepreg laid in the front section, a corresponding layer of glass fiber prepreg is laid in the rear section. After the laying is completed, a hot pressing process is used to cure and shape the polyimide resin composite material according to the set curing process.
[0007] The polyimide resin solution has a resin content of 40% to 55%.
[0008] The carbon fiber is one of T300, T800, CCF300, and CCF800.
[0009] The glass fiber is one of SW220C, SW200D, SW240F, SW280F, and QW280A.
[0010] The resin content of the carbon fiber prepreg and glass fiber prepreg is 30-45%.
[0011] The length of the glass fiber prepreg accounts for 18% to 25% of the total length of the outer adjusting sheet, and the gradient length between two adjacent layers of glass fiber prepreg accounts for 0.5% to 1% of the total length of the outer adjusting sheet.
[0012] The hot pressing process uses an autoclave molding process, and the curing temperature is between 350℃ and 400℃.
[0013] The winding speed of the wet prepreg machine for preparing carbon fiber prepreg and glass fiber prepreg is 1.7 to 2.5 meters per minute, and the drying temperature is 80 to 95 degrees Celsius.
[0014] Advantages of this invention:
[0015] The advantage of this invention is that the composite material outer regulating sheet is integrally molded during the preparation process, without adding any steps, and the operation is simple. By simply designing the length ratio of carbon fiber and glass fiber prepreg in different layups, the temperature resistance of the outer regulating sheet in the length direction can be improved to varying degrees, meeting the gradually increasing temperature resistance requirements of the outer regulating sheet from head to tail, and the temperature resistance can be improved by 10 to 20°C.
[0016] The resin-based composite material external conditioning plate prepared by this invention can achieve maximum weight reduction compared to metal-based external conditioning plates, while also possessing gradient temperature bearing capacity, which has significant technical advantages and is of great importance for the application of novel resin-based composite materials in aerospace. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of a carbon fiber / glass fiber prepreg composite layup. Detailed Implementation
[0018] The present invention will now be described in detail with reference to the accompanying drawings:
[0019] In order to provide a clearer understanding of the technical features, objectives and beneficial effects of the present invention, the technical solution of the present invention will now be described in detail below, but this should not be construed as a limitation on the scope of implementation of the present invention.
[0020] Prepregs were prepared using a wet process. Carbon fiber and glass fiber prepregs were cut into sheets according to the dimensions of each layer and laid on a mold according to the proportions of each layer. After laying, the sheets were placed in an autoclave for high-temperature curing to obtain a resin-based composite material outer conditioning sheet with gradient high-temperature resistance. Specifically:
[0021] A method for preparing an improved temperature resistance sheet for composite materials includes the following steps: First, a carbon fiber prepreg is prepared by a wet process using a polyimide resin solution and carbon fibers, wherein the resin content of the polyimide resin solution is 40%–55%; and the carbon fibers are one of T300, T800, CCF300, and CCF800. A glass fiber prepreg is then prepared using the same method with a polyimide resin solution and glass fibers; the glass fibers are one of SW220C, SW200D, SW240F, SW280F, and QW280A.
[0022] The resin content of the carbon fiber prepreg and glass fiber prepreg is 30-45%.
[0023] The winding speed of the wet prepreg machine for preparing carbon fiber prepreg and glass fiber prepreg is 1.7 to 2.5 meters per minute, and the drying temperature is 80 to 95 degrees Celsius.
[0024] like Figure 1 As shown, the front section of the outer adjusting sheet uses carbon fiber prepreg and the rear section uses glass fiber prepreg. The thickness of the carbon fiber prepreg is 0.10-0.15 mm, and the thickness of the glass fiber prepreg is 0.20-0.30 mm. During the laying process, for every 2-3 layers of carbon fiber prepreg laid in the front section, a corresponding layer of glass fiber prepreg is laid in the rear section. The length of the glass fiber prepreg accounts for 18%-25% of the total length of the outer adjusting sheet, and the gradient length between adjacent layers of glass fiber prepreg accounts for 0.5%-1% of the total length of the outer adjusting sheet.
[0025] After installation, a hot-pressing process is used to cure the polyimide resin composite material according to the established curing process. The hot-pressing process utilizes an autoclave molding process, with a curing temperature between 350℃ and 400℃.
[0026] Example 1:
[0027] 1. Preparation of carbon fiber prepreg and glass fiber prepreg
[0028] CCF800 carbon fiber and SW280F glass fiber were used as reinforcements, respectively. The resin content of the polyimide resin solution was 40%. The prepregs were prepared by wet process. The resin content of the carbon fiber prepreg was 32±5%, and the resin content of the glass fiber prepreg was 35±5%.
[0029] 2. Preparation of external conditioning plates of resin-based composite materials with gradient temperature resistance
[0030] The prepared prepregs were manually laid according to the process requirements. Carbon fiber prepreg was used for the front section, and glass fiber prepreg for the rear section. Due to the different thicknesses of the two prepregs, for every two layers of carbon fiber prepreg laid in the front section, one layer of glass fiber prepreg was laid in the rear section. The table shows the percentage of carbon fiber and glass fiber prepreg in each layer relative to the length of the conditioning sheet. After each layer was laid, it was cured using an autoclave according to the set process procedure at a curing temperature of 360℃. After curing, it was cooled to below 60℃ in the autoclave and removed from the autoclave, completing the preparation of a resin-based composite material outer conditioning sheet with gradient high-temperature resistance.
[0031]
[0032] Example 2:
[0033] 1. Preparation of carbon fiber prepreg and glass fiber prepreg
[0034] CCF300 carbon fiber and QW280A glass fiber were used as reinforcements, respectively. The resin content of the polyimide resin solution was 45%. 1000mm wide prepregs were prepared by wet process. The resin content of the carbon fiber prepreg was 36±5%, and the resin content of the glass fiber prepreg was 40±5%.
[0035] 2. Preparation of external conditioning plates of resin-based composite materials with gradient temperature resistance
[0036] The prepared prepregs were manually laid according to the process requirements. Carbon fiber prepreg was used for the front section, and glass fiber prepreg for the rear section. Due to the different thicknesses of the two prepregs, for every two layers of carbon fiber prepreg in the front section, one layer of glass fiber prepreg was laid in the rear section. The table shows the percentage of carbon fiber and glass fiber prepreg in each layer relative to the length of the conditioning sheet. After each layer was laid, it was cured using an autoclave according to the set process procedure at a curing temperature of 380℃. After curing, it was cooled to below 60℃ in the autoclave and removed from the autoclave, completing the preparation of a resin-based composite material outer conditioning sheet with gradient high-temperature resistance.
[0037]
[0038] Example 3:
[0039] 1. Preparation of carbon fiber prepreg and glass fiber prepreg
[0040] T300 carbon fiber and SW240F glass fiber were used as reinforcements, respectively. The resin content of the polyimide resin solution was 50%. 1000mm wide prepregs were prepared by wet process. The resin content of the carbon fiber prepreg was 40±5%, and the resin content of the glass fiber prepreg was 45±5%.
[0041] 2. Preparation of external conditioning plates of resin-based composite materials with gradient temperature resistance
[0042] The prepared prepregs were manually laid according to the process requirements. Carbon fiber prepreg was used for the front section, and glass fiber prepreg for the rear section. Due to the different thicknesses of the two prepregs, for every two layers of carbon fiber prepreg laid in the front section, one layer of glass fiber prepreg was laid in the rear section. The table shows the percentage of carbon fiber and glass fiber prepreg in each layer relative to the length of the conditioning sheet. After each layer was laid, it was cured using an autoclave according to the set process procedure at a curing temperature of 390℃. After curing, it was cooled to below 60℃ in the autoclave and removed from the autoclave, completing the preparation of a resin-based composite material outer conditioning sheet with gradient high-temperature resistance.
[0043]
Claims
1. A method for preparing an improved temperature resistance plate for composite materials, comprising the following steps: First, carbon fiber prepreg is prepared by wet process using polyimide resin solution and carbon fiber, and glass fiber prepreg is prepared by the same method using polyimide resin solution and glass fiber. The front section of the outer adjustment sheet uses carbon fiber prepreg and the rear section uses glass fiber prepreg. The thickness of carbon fiber prepreg is 0.10~0.15mm and the thickness of glass fiber prepreg is 0.20~0.30mm. During the laying process, for every 2~3 layers of carbon fiber prepreg laid in the front section, a corresponding layer of glass fiber prepreg is laid in the rear section. After the laying is completed, a hot pressing process is used to cure and shape the polyimide resin composite material according to the set curing process. The length of the glass fiber prepreg accounts for 18% to 25% of the total length of the outer regulating sheet, and the gradient length between two adjacent glass fiber prepreg layers accounts for 0.5% to 1% of the total length of the outer regulating sheet. The temperature resistance of the outer regulating sheet can be gradually increased along the length direction.
2. The method for preparing an improved temperature resistance plate for composite materials according to claim 1, characterized in that, The polyimide resin solution has a resin content of 40% to 55%.
3. The method for preparing an improved temperature resistance plate for composite materials according to claim 1, characterized in that, The carbon fiber is one of T300, T800, CCF300, and CCF800.
4. The method for preparing an improved temperature resistance plate for composite materials according to claim 1, characterized in that, The glass fiber is one of SW220C, SW200D, SW240F, SW280F, and QW280A.
5. The method for preparing an improved temperature resistance plate for composite materials according to claim 1, characterized in that, The resin content of the carbon fiber prepreg and glass fiber prepreg is 30-45%.
6. The method for preparing an improved temperature resistance plate for composite materials according to claim 1, characterized in that, The hot pressing process uses an autoclave molding process, and the curing temperature is 350℃~400℃.
7. The method for preparing an improved temperature resistance plate for composite materials according to claim 1, characterized in that, The wet prepreg machine for preparing carbon fiber prepreg and glass fiber prepreg has a winding speed of 1.7~2.5 m / min and a drying temperature of 80~95℃.