Preparation method of high-temperature resistant composite material outer conditioning plate with glass cloth sacrificial layer

Abstract

This invention belongs to the field of composite material technology and relates to a method for preparing a high-temperature resistant composite material outer conditioning sheet with a glass cloth sacrificial layer. The outer conditioning sheet is ply-laminated with a composite layer of carbon fiber and glass fiber, with an additional glass fiber layer added to the tail section of the inner surface of the outer conditioning sheet. The center of the glass fiber layer is dry glass fiber cloth of a specific shape and size, and the edges are glass fiber prepreg. After curing, a hollow structure can be formed in the carbon fiber and glass fiber layers of the tail section of the composite material outer conditioning sheet. This effectively reduces heat transfer from the inner surface to the outer surface of the outer conditioning sheet, meeting the requirements of the material's temperature resistance due to the higher ambient temperature at the tail section. Compared with metal-based outer conditioning sheets, the composite material outer conditioning sheet prepared by this invention can effectively reduce weight and has higher temperature resistance at the tail section, exhibiting significant technical advantages and important implications for the application of novel resin-based composite materials in aerospace.

Description

Technical Field

[0001] This invention belongs to the field of composite material technology and relates to a method for preparing a high-temperature resistant composite material outer conditioning sheet with a glass cloth sacrificial layer. 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] The air-insulated structure has low thermal conductivity, which can effectively improve the temperature resistance of composite materials. In addition, the high-strength glass fiber has excellent thermal insulation properties 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 a high-temperature resistant composite material outer conditioning plate with a glass cloth sacrificial layer. This method is simple, improves the temperature resistance of the outer conditioning plate, and meets the requirements of the high external temperature at the tail of the outer conditioning plate for the material's temperature resistance.

[0006] The technical solution of this invention: a high-temperature resistant composite material outer adjustment sheet with a glass cloth sacrificial layer, characterized in that the outer adjustment sheet has a strip-shaped arc structure with a triangular tail section, the main body is a carbon fiber layup, the inner surface of the middle part of the tail section of the carbon fiber layup is a layer of pentagonal glass fiber cloth, and the periphery of the pentagonal glass fiber cloth is glass fiber prepreg.

[0007] The length of the glass fiber cloth and glass fiber prepreg accounts for 20% to 25% of the total length of the outer adjustment sheet.

[0008] The arc of the arc structure, i.e., the height difference, is 30-50mm.

[0009] A method for preparing a high-temperature resistant composite material outer conditioning sheet with a glass cloth sacrificial layer includes the following steps: 1. Preparing carbon fiber prepreg and glass fiber prepreg using a wet process with polyimide resin solution and carbon fiber; 2. Preparing carbon fiber layup: the length of the carbon fiber layup is 800-1000 mm, the width is 150-200 mm, and the total thickness of the layup is 2-3 mm; 3. Adding a pentagonal glass fiber cloth to the inner surface of the tail section of the carbon fiber layup, the edge of the pentagonal glass fiber cloth being glass fiber prepreg, and curing it using a hot pressing process according to the set polyimide resin composite material curing process.

[0010] The polyimide resin solution has a resin content of 40% to 55%.

[0011] The carbon fiber is one of T300, T800, CCF300, and CCF800.

[0012] The glass fiber is one of SW100A, SW220C, SW200D, SW240F, SW280F, and QW280A.

[0013] The resin content of the carbon fiber prepreg and glass fiber prepreg is 30-45%.

[0014] The external adjustment sheet molding process uses an autoclave molding process, with a curing temperature of 350℃~400℃.

[0015] 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.

[0016] Advantages of this invention:

[0017] The advantage of this invention is that the composite material outer regulating plate is integrally molded during the preparation process, without adding any steps, and the operation is simple. It only requires adding a glass fiber layup to the tail section of the inner surface of the outer regulating plate. The center of the glass fiber layer is a dry glass fiber cloth of a specific shape and size, and the edge is glass fiber prepreg. After curing, an air sandwich structure can be formed between the carbon fiber layup and the glass fiber layup in the tail section. That is, there are tiny gaps between the glass fiber cloth and the carbon fiber layup, which can effectively reduce the heat transfer from the inner surface to the outer surface of the outer regulating plate. At the same time, the glass fiber cloth itself can serve as a temperature-resistant sacrificial layer to meet the requirements of the material's temperature resistance due to the higher external temperature at the tail of the outer regulating plate.

[0018] The composite material outer adjustment plate prepared by this invention can effectively reduce weight compared with the metal-based outer adjustment plate, and the tail section has a high temperature resistance, which has great technical advantages and is of great significance for the application of new resin-based composite materials in aerospace. Attached Figure Description

[0019] Figure 1 This is a top view of the external adjustment plate;

[0020] Figure 2 This is the main view of the external adjustment plate;

[0021] Figure 3 Schematic diagram of glass fiber layup. Detailed Implementation

[0022] 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 with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the scope of the present invention.

[0023] First, carbon fiber prepreg and glass fiber prepreg are prepared using a wet prepreg machine via a wet process. Figure 1 , Figure 2 To create the three-dimensional configuration of the outer conditioning sheet, carbon fiber prepreg and glass fiber prepreg are cut into sheets according to the sheet's dimensions. These sheets are then laid out on a mold according to the designed layering sequence. After laying, the sheets are placed in an autoclave for high-temperature curing to obtain a high-temperature resistant composite material outer conditioning sheet with a glass cloth sacrificial layer. Specifically:

[0024] A high-temperature resistant composite material outer adjustment sheet with a glass cloth sacrificial layer is characterized in that the outer adjustment sheet has a strip-shaped arc structure with a triangular tail section, the main body is a carbon fiber layup, the inner surface of the middle part of the tail section of the carbon fiber layup is a layer of pentagonal glass fiber cloth, and the periphery of the pentagonal glass fiber cloth is glass fiber prepreg.

[0025] The length of the glass fiber cloth and glass fiber prepreg accounts for 20% to 25% of the total length of the outer adjustment sheet.

[0026] The arc of the arc structure, i.e., the height difference, is 30-50mm.

[0027] A method for preparing a high-temperature resistant composite material outer conditioning plate with a glass cloth sacrificial layer includes the following steps:

[0028] 1) Carbon fiber prepreg and glass fiber prepreg are prepared by a wet process using a polyimide resin solution and carbon fiber; the polyimide resin solution has a resin content of 40%–55%; the carbon fiber is one of T300, T800, CCF300, and CCF800; the glass fiber is one of SW100A, SW220C, SW200D, SW240F, SW280F, and QW280A; the resin content of the carbon fiber prepreg and glass fiber prepreg is 30%–45%; the winding speed of the wet prepreg machine for preparing the carbon fiber prepreg and glass fiber prepreg is 1.7–2.5 m / min, and the drying temperature is 80–95℃.

[0029] 2) Preparation of carbon fiber layup: The length of the carbon fiber layup is 800-1000 mm, the width is 150-200 mm, and the total thickness of the layup is 2-3 mm;

[0030] 3) A layer of pentagonal glass fiber cloth is added to the inner surface of the tail section of the carbon fiber layup. The edges of the pentagonal glass fiber cloth are made of glass fiber prepreg. The process is hot-pressed and cured according to the established polyimide resin composite material curing process. The external regulating sheet molding process uses an autoclave molding process, with a curing temperature of 350℃~400℃.

[0031] Example 1:

[0032] 1. Preparation of carbon fiber prepreg and glass fiber prepreg

[0033] CCF800 carbon fiber and SW100A glass fiber were used as reinforcements, respectively. The resin content of the polyimide resin solution was 40%. 1000mm wide 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%.

[0034] 2. Preparation of high-temperature resistant composite material external conditioning plate with glass cloth sacrificial layer

[0035] The prepared prepregs were manually laid according to the process requirements. First, carbon fiber prepreg was laid, followed by glass fiber cloth and glass fiber prepreg of specific dimensions in the tail area. The length of the glass fiber layup accounted for 20% of the total length of the outer conditioning sheet. After each layup was completed, the sheet was cured using a pre-defined process in an autoclave at a curing temperature of 350℃. After curing, the sheet was cooled to below 60℃ before being removed from the autoclave, completing the preparation of the high-temperature resistant composite material outer conditioning sheet with a glass cloth sacrificial layer.

[0036] Example 2:

[0037] 1. Preparation of carbon fiber prepreg and glass fiber prepreg

[0038] CCF300 carbon fiber and SW280F 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%.

[0039] 2. Preparation of high-temperature resistant composite material external conditioning plate with glass cloth sacrificial layer

[0040] The prepared prepregs were manually laid according to the process requirements. First, carbon fiber prepreg was laid, followed by glass fiber cloth and glass fiber prepreg of specific dimensions in the tail area. The length of the glass fiber layup accounted for 22% of the total length of the outer conditioning sheet. After each layup was completed, the sheet was cured using a pre-defined process in an autoclave at a curing temperature of 380℃. After curing, the sheet was cooled to below 60℃ before being removed from the autoclave, completing the preparation of the high-temperature resistant composite material outer conditioning sheet with a glass cloth sacrificial layer.

[0041] Example 3:

[0042] 1. Preparation of carbon fiber prepreg and glass fiber prepreg

[0043] 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 38±4%, and the resin content of the glass fiber prepreg was 38±5%.

[0044] 2. Preparation of high-temperature resistant composite material external conditioning plate with glass cloth sacrificial layer

[0045] The prepared prepregs were manually laid according to the process requirements. First, carbon fiber prepreg was laid, followed by glass fiber cloth and glass fiber prepreg of specific dimensions in the tail area. The length of the glass fiber layup accounted for 25% of the total length of the outer conditioning sheet. After each layup was completed, the sheet was cured using a pre-defined process in an autoclave at a curing temperature of 400℃. After curing, the sheet was cooled to below 60℃ before being removed from the autoclave, completing the preparation of the high-temperature resistant composite material outer conditioning sheet with a glass cloth sacrificial layer.

Claims

1. A high-temperature resistant composite material outer conditioning sheet with a glass cloth sacrificial layer, characterized in that, The external adjustment plate has a strip-shaped arc structure with a triangular tail section. The main body is a carbon fiber layup, and the inner surface of the middle part of the tail section of the carbon fiber layup is a layer of pentagonal glass fiber cloth. The periphery of the pentagonal glass fiber cloth is glass fiber prepreg. The glass fiber prepreg has a pentagonal hollow structure in the center. The pentagonal glass fiber cloth is laid at the hollow structure in the center of the glass fiber prepreg and overlaps reasonably with the edge of the glass fiber prepreg to form the same uniform layer.

2. The high-temperature resistant composite material outer conditioning plate with a glass cloth sacrificial layer according to claim 1, characterized in that, The arc of the arc structure, i.e., the height difference, is 30-50mm.

3. The method for preparing the high-temperature resistant composite material outer conditioning plate with a glass cloth sacrificial layer according to claim 1 or 2, comprising the following steps: 1) Prepare carbon fiber prepreg and glass fiber prepreg using a wet process with polyimide resin solution and carbon fiber; 2) Prepare carbon fiber layup: the length of the carbon fiber layup is 800-1000 mm, the width is 150-200 mm, and the total thickness of the layup is 2-3 mm; 3) Add a layer of pentagonal glass fiber cloth to the inner surface of the tail section of the carbon fiber layup. The edge of the pentagonal glass fiber cloth is glass fiber prepreg. The process is carried out by hot pressing and curing according to the set polyimide resin composite material curing process. The center of the glass fiber layer prepreg is set as a pentagonal hollow structure. The pentagonal glass fiber cloth is laid at the hollow structure position in the center of the glass fiber layer prepreg and overlaps reasonably with the edge of the glass fiber prepreg to form the same uniform layer.

4. The method for preparing the high-temperature resistant composite material outer conditioning sheet with a glass cloth sacrificial layer according to claim 3, characterized in that, The polyimide resin solution has a resin content of 40% to 55%.

5. The method for preparing a high-temperature resistant composite material outer conditioning sheet with a glass cloth sacrificial layer according to claim 3, characterized in that, The carbon fiber mentioned is T800.

6. The method for preparing the high-temperature resistant composite material outer conditioning plate with a glass cloth sacrificial layer according to claim 3, characterized in that, The glass fiber is one of SW220C, SW200D, or QW280A.

7. The method for preparing the high-temperature resistant composite material outer conditioning sheet with a glass cloth sacrificial layer according to claim 3, characterized in that, 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.

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