Preparation method of high-temperature-resistant composite material external adjusting sheet with glass cloth sacrificial layer

Abstract

The invention belongs to the technical field of composite materials, and relates to a preparation method of a high-temperature-resistant composite material outer adjusting sheet with a glass cloth sacrificial layer. The outer adjusting sheet laying layer is a carbon fiber and glass fiber composite laying layer, a glass fiber laying layer is additionally arranged on the tail section of the inner surface of the outer adjusting sheet, the center of the glass fiber laying layer is dry glass fiber cloth with a specific shape and size, and the edge of the glass fiber laying layer is glass fiber prepreg. A hollow structure can be formed in the carbon fiber laying layer and the glass fiber laying layer of the tail section of the composite material outer adjusting sheet after curing forming. The heat transfer of the outer adjusting sheet from the inner surface to the outer surface can be effectively reduced, and the requirement of high external temperature at the tail of the outer adjusting sheet on the temperature resistance of the material is met. Compared with a metal-based external adjusting sheet, the composite material external adjusting sheet prepared by the invention has the advantages that the weight can be effectively reduced, and the tail section has higher temperature resistance, so that the composite material external adjusting sheet has great technical advantages and has important significance in application of novel resin-based composite materials for aerospace.

Description

Technical Field

[0001] The invention belongs to the technical field of composite materials and relates to a method for preparing a high-temperature resistant composite material outer regulating sheet with a glass cloth sacrificial layer. Background Art

[0002] Resin-based composite materials have attracted wide attention due to their designability, high specific strength, and light weight. They have very important applications in wind turbine blades, large aircraft, and new generation aerospace vehicles. At present, resin-based composite materials are increasingly used in aero engines and are also beginning to be used in external adjustment plates.

[0003] During the test run of the composite outer adjustment plate of an aircraft engine, the temperature of the inner surface of the outer adjustment plate rises due to the influence of the heat flow from the tail nozzle, resulting in local bulging. The short-term high temperature environment will cause the composite resin to soften quickly and lose the interlayer interface bonding force, resulting in interlayer delamination, and then the phenomenon of bulging on the inner surface, causing the strength and other mechanical properties of the composite material to decrease, affecting the reliability of the composite outer adjustment plate.

[0004] The air sandwich structure has low thermal conductivity. This structural design can effectively improve the temperature resistance of composite materials. High-strength glass fiber has excellent thermal insulation performance and high-temperature stability. It can be used as an insulation layer in composite materials in high-temperature environments. It is an ideal material for improving the temperature resistance of composite materials. Summary of the invention

[0005] To solve the above problems, the purpose of the present invention is to provide a method for preparing a high-temperature resistant composite material outer adjustment sheet with a glass cloth sacrificial layer. The preparation method is simple, and the temperature resistance of the outer adjustment sheet can be improved to meet the requirements of the material's temperature resistance due to the higher external temperature at the tail of the outer adjustment sheet.

[0006] The technical solution of the present invention is a high-temperature resistant composite material outer adjustment plate with a glass cloth sacrificial layer, characterized in that the outer adjustment plate is a strip arc structure, the tail section is a triangle, the main body is a carbon fiber ply, the inner surface of the middle part of the tail section of the carbon fiber ply 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 the glass fiber prepreg accounts for 20% to 25% of the total length of the outer adjustment sheet.

[0008] The arc angle of the arc structure, ie the height difference, is 30 to 50 mm.

[0009] The preparation method of a high-temperature resistant composite material outer regulating sheet with a glass cloth sacrificial layer comprises the following steps: 1. preparing carbon fiber prepreg and glass fiber prepreg by a wet method using a polyimide resin solution and carbon fiber; 2. preparing a carbon fiber ply: the carbon fiber ply has a length of 800 to 1000 mm, a width of 150 to 200 mm, and a total ply thickness of 2 to 3 mm; 3. adding a layer of pentagonal glass fiber cloth to the inner surface of the tail section of the carbon fiber ply, the edge of the pentagonal glass fiber cloth is glass fiber prepreg, and a hot pressing process is adopted to perform curing and molding according to a set polyimide resin composite material curing process.

[0010] The resin content of the polyimide resin solution is 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 the glass fiber prepreg is 30-45%.

[0014] The outer adjustment sheet molding process uses a hot-press molding process, and the curing molding temperature is 350° C. to 400° C.

[0015] The winding speed of the wet prepreg machine for preparing carbon fiber prepreg and glass fiber prepreg by wet method is 1.7-2.5 m / min, and the drying temperature is 80-95°C.

[0016] Advantages of the present invention:

[0017] The advantage of the present invention is that the composite material outer adjusting plate is formed in an integrated manner during the preparation process, without adding any steps and with simple operation. Only a layer of glass fiber ply is added to the tail section of the inner surface of the outer adjusting plate, the center of the glass fiber layer is a dry glass fiber cloth of a specific shape and size, and the edge is a glass fiber prepreg. After curing and forming, an air sandwich structure can be formed between the carbon fiber ply and the glass fiber ply at the tail section, that is, there is a small gap between the glass fiber cloth and the carbon fiber ply, which can effectively reduce the heat transfer from the inner surface to the outer surface of the outer adjusting plate. At the same time, the glass fiber cloth itself can be used as a temperature-resistant sacrificial layer to meet the requirements of the material's temperature resistance at the higher external temperature at the tail section of the outer adjusting plate.

[0018] The composite material outer adjustment sheet prepared by the present invention can effectively reduce weight compared with the metal-based outer adjustment sheet, and the tail section has higher temperature resistance, has great technical advantages, and is of great significance for the application of new resin-based composite materials in aerospace. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a top view of the outer adjustment sheet;

[0020] Figure 2 This is the front view of the outer adjustment piece;

[0021] Figure 3 Schematic diagram of glass fiber layup. DETAILED DESCRIPTION

[0022] In order to have a clearer understanding of the technical features, purposes and beneficial effects of the present invention, the technical solution of the present invention is described in detail below with reference to the accompanying drawings and embodiments, but they should not be construed as stipulating the applicable scope of the present invention.

[0023] First, a wet prepreg machine is used to prepare carbon fiber prepreg and glass fiber prepreg by wet method. Figure 1 , Figure 2 To form the three-dimensional configuration of the outer adjustment sheet, the carbon fiber prepreg and the glass fiber prepreg are cut into sheets according to the size of the outer adjustment sheet, and laid on the mold according to the designed layering sequence. After laying, they are placed in an autoclave for high-temperature curing to obtain a high-temperature resistant composite outer adjustment sheet with a glass cloth sacrificial layer. Specifically:

[0024] A high temperature resistant composite material outer adjustment plate with a glass cloth sacrificial layer is characterized in that the outer adjustment plate is a strip arc structure, the tail section is a triangle, the main body is a carbon fiber ply, the inner surface of the middle part of the tail section of the carbon fiber ply 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 the glass fiber prepreg accounts for 20% to 25% of the total length of the outer adjustment sheet.

[0026] The arc angle of the arc structure, ie the height difference, is 30 to 50 mm.

[0027] A method for preparing a high temperature resistant composite material outer adjustment sheet having a glass cloth sacrificial layer comprises the following steps:

[0028] 1) Use polyimide resin solution and carbon fiber to prepare carbon fiber prepreg and glass fiber prepreg by wet method; the resin content of the polyimide resin solution is 40% to 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 the glass fiber prepreg is 30 to 45%. The winding speed of the wet prepreg machine for preparing the carbon fiber prepreg and the glass fiber prepreg by wet method is 1.7 to 2.5 meters per minute, and the drying temperature is 80 to 95 degrees Celsius.

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

[0030] 3) Add a layer of pentagonal glass fiber cloth on the inner surface of the tail section of the carbon fiber ply, the edge of the pentagonal glass fiber cloth is glass fiber prepreg, and the hot pressing process is used to cure and mold according to the set polyimide resin composite material curing process. The outer adjustment sheet molding process uses a hot press molding process, and the curing molding temperature is 350℃~400℃.

[0032] Embodiment 1:

[0033] 1. Preparation of carbon fiber prepreg and glass fiber prepreg

[0034] CCF800 carbon fiber and SW100A glass fiber are used as reinforcements respectively, the resin content of the polyimide resin solution is 40%, and 1000mm wide prepregs are prepared by wet method. The resin content of the carbon fiber prepreg is 32±5%, and the resin content of the glass fiber prepreg is 35±5%.

[0035] 2. Preparation of high temperature resistant composite material outer adjustment sheet with glass cloth sacrificial layer

[0036] The prepared prepreg is laid manually according to the process requirements. The carbon fiber prepreg is laid first, and then the glass fiber cloth and glass fiber prepreg of specific size are laid in the tail area. The length of the glass fiber layer accounts for 20% of the total length of the outer adjustment sheet. After the laying of each layer is completed, the hot autoclave method is used to cure and shape using the set process program, and the curing temperature is 350°C. After the curing is completed, it is cooled to below 60°C and taken out of the tank, completing the preparation of the high-temperature resistant composite material outer adjustment sheet with a glass cloth sacrificial layer.

[0037] Embodiment 2:

[0038] 1. Preparation of carbon fiber prepreg and glass fiber prepreg

[0039] CCF300 carbon fiber and SW280F glass fiber are used as reinforcements respectively, the resin content of the polyimide resin solution is 45%, and 1000mm wide prepregs are prepared by wet method. The resin content of the carbon fiber prepreg is 36±5%, and the resin content of the glass fiber prepreg is 40±5%.

[0040] 2. Preparation of high temperature resistant composite material outer adjustment sheet with glass cloth sacrificial layer

[0041] The prepared prepreg is laid manually according to the process requirements. The carbon fiber prepreg is laid first, and then the glass fiber cloth and glass fiber prepreg of specific size are laid in the tail area. The length of the glass fiber layer accounts for 22% of the total length of the outer adjustment plate. After the laying of each layer is completed, the hot autoclave method is used to cure and form using the set process program, and the curing temperature is 380°C. After the curing is completed, it is cooled to below 60°C and taken out of the tank, completing the preparation of the high-temperature resistant composite material outer adjustment plate with a glass cloth sacrificial layer.

[0042] Embodiment 3:

[0043] 1. Preparation of carbon fiber prepreg and glass fiber prepreg

[0044] T300 carbon fiber and SW240F glass fiber are used as reinforcements respectively, the resin content of the polyimide resin solution is 50%, and 1000mm wide prepregs are prepared by wet method. The resin content of the carbon fiber prepreg is 38±4%, and the resin content of the glass fiber prepreg is 38±5%.

[0045] 2. Preparation of high temperature resistant composite material outer adjustment sheet with glass cloth sacrificial layer

[0046] The prepared prepreg is laid manually according to the process requirements. The carbon fiber prepreg is laid first, and then the glass fiber cloth and glass fiber prepreg of specific size are laid in the tail area. The length of the glass fiber layer accounts for 25% of the total length of the outer adjustment plate. After the laying of each layer is completed, the hot autoclave method is used to cure and form using the set process program, and the curing temperature is 400°C. After the curing is completed, it is cooled to below 60°C and taken out of the tank, completing the preparation of the high-temperature resistant composite material outer adjustment plate with a glass cloth sacrificial layer.

Claims

1. A high temperature resistant composite material outer adjustment sheet with a glass cloth sacrificial layer, characterized in that: The outer adjustment piece is a strip arc structure, the tail section is a triangle, the main body is a carbon fiber ply, the inner surface of the middle part of the tail section of the carbon fiber ply is a layer of pentagonal glass fiber cloth, and the periphery of the pentagonal glass fiber cloth is glass fiber prepreg.

2. The high temperature resistant composite material outer adjustment sheet with a glass cloth sacrificial layer according to claim 1, characterized in that: The length of the glass fiber cloth and the glass fiber prepreg accounts for 20% to 25% of the total length of the outer adjustment sheet.

3. The high temperature resistant composite material outer adjustment sheet with a glass cloth sacrificial layer according to claim 1, characterized in that: The arc angle of the arc structure, ie the height difference, is 30 to 50 mm.

4. The method for preparing the high temperature resistant composite material outer adjustment sheet with a glass cloth sacrificial layer according to claim 1 or 2, comprising the following steps: 1) Use polyimide resin solution and carbon fiber to prepare carbon fiber prepreg and glass fiber prepreg by wet method; 2) Prepare carbon fiber ply: the carbon fiber ply length is 800-1000mm, the width is 150-200mm, and the total ply thickness is 2-3mm; 3) Add a layer of pentagonal glass fiber cloth on the inner surface of the tail section of the carbon fiber ply, the edge of the pentagonal glass fiber cloth is glass fiber prepreg, and hot pressing process is adopted to perform curing and molding according to the set polyimide resin composite material curing process.

5. The method for preparing a high temperature resistant composite material outer adjustment sheet having a glass cloth sacrificial layer according to claim 4, characterized in that: The resin content of the polyimide resin solution is 40% to 55%.

6. The method for preparing a high temperature resistant composite material outer adjustment sheet with a glass cloth sacrificial layer according to claim 4, characterized in that: The carbon fiber is one of T300, T800, CCF300 and CCF800.

7. The method for preparing a high temperature resistant composite material outer adjustment sheet with a glass cloth sacrificial layer according to claim 4, characterized in that: The glass fiber is one of SW100A, SW220C, SW200D, SW240F, SW280F, and QW280A.

8. The method for preparing a high temperature resistant composite material outer adjustment sheet with a glass cloth sacrificial layer according to claim 4, characterized in that: The resin content of the carbon fiber prepreg and the glass fiber prepreg is 30-45%.

9. The method for preparing a high temperature resistant composite material outer adjustment sheet with a glass cloth sacrificial layer according to claim 4, characterized in that: The outer adjustment sheet molding process uses a hot-press molding process, and the curing molding temperature is 350° C. to 400° C.

10. The method for preparing a high temperature resistant composite material outer adjustment sheet with a glass cloth sacrificial layer according to claim 4, characterized in that: The winding speed of the wet prepreg machine for preparing carbon fiber prepreg and glass fiber prepreg by wet method is 1.7-2.5 m / min, and the drying temperature is 80-95°C.

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