A polyetheretherketone composite material for high-temperature resistant fuel and its preparation method

Abstract

The present invention provides a polyetheretherketone composite material resistant to high-temperature fuel and a preparation method thereof. The lightweight and high-strength polyetheretherketone serves as the polymer matrix, and carbon fibers with multiple functions such as heat conduction, reinforcement, and wear resistance are used as the main fillers, combined with a small amount of auxiliary components, and prepared by molding and sintering. In the present invention, polyetheretherketone is used as the matrix, and polyacrylonitrile-based carbon fibers and mesophase pitch-based carbon fibers are ground to obtain the same aspect ratio and then used as the main reinforcing fillers. Among them, the polyacrylonitrile-based carbon fibers have high strength and modulus, which can improve the mechanical properties and wear resistance of the composite material, while the mesophase pitch-based carbon fibers have a much higher thermal conductivity than the former, which can effectively promote the dissipation of environmental heat and frictional heat in the composite material in high-temperature fuel. The polyetheretherketone lubricating material resistant to high-temperature fuel provided by the present invention is suitable for bearings, labyrinth seals, stuffing boxes, throat bushings, etc. in the fuel control system of aeroengines, and can also be applied to friction components in automotive engines that are in direct contact with fuel and various friction components under lubrication with other high-temperature and low-viscosity media.

Description

Technical Field

[0001] The present invention relates to a polymer composite material, and particularly to a polyetheretherketone composite material resistant to high-temperature fuel conditions and a preparation method thereof. Based on the comprehensive technical advantages of polyetheretherketone composite materials such as high strength, low friction, high wear resistance, low expansion, and easy processing, this material particularly has the characteristics of high temperature resistance, fuel aging resistance, and erosion resistance. It is mainly used to manufacture friction components such as bearings, labyrinth seals, port rings, and throat bushings in the fuel control systems of the aerospace and automotive transportation fields, and belongs to the field of composite materials. Background Art

[0002] The fuel control system is a core component of aircraft engines and automotive engines. Its function is to provide fuel with a certain pressure and flow rate for the engine to meet the fuel requirements of the engine under different working conditions and different environmental conditions. Key friction components such as bearings, labyrinth seals, port rings, and throat bushings in the engine fuel control system are directly in service in a high-temperature fuel environment for a long time. The dimensional and performance stability thereof is of great significance for ensuring its safe and reliable service. At present, a large amount of No. 3 fuel is used in China, and its technical standard is implemented in GB 6537 - 2006. On the one hand, aviation fuel has a low viscosity, generally only 1.4 - 1.7 mm 2 / s at 20°C, and its lubricating performance is poor. At high temperatures, the viscosity further decreases, making it difficult to effectively lubricate friction components. On the other hand, aviation fuel is composed of alkanes, cycloalkanes, aromatics, and olefins. Among them, the structures of alkanes and cycloalkanes are stable, and the olefin content is low. As aromatics gradually penetrate and diffuse into the high-molecular materials serving in it, it often causes the swelling of the high-molecular materials, which has certain damage to their physical and chemical properties and mechanical properties. Especially at high temperatures, it may cause dimensional and performance changes, resulting in lubrication failure. Therefore, although high-molecular materials have characteristics such as lightweight, self-lubrication, and high wear resistance, the problem of insufficient high-temperature fuel compatibility limits their applications.

[0003] Currently, high-molecular materials are often only used as sealing components in fuel systems, represented by nitrile rubber, fluororubber, and fluorosilicone rubber. Their current level is that after being soaked at 100°C for 24 h, their volume change is about 6%, and the elongation at break decreases by about 40%. For load-bearing components such as bearings, labyrinth seals, port rings, and throat bushings, the existing rubber sealing materials are difficult to meet the application requirements in terms of their own strength, high-temperature fuel adaptability, and fuel resistance. Therefore, it is urgent to develop polymer composite materials with comprehensive technical advantages such as high temperature resistance, aging resistance, erosion resistance, high strength, low friction, high wear resistance, low expansion, and easy processing to meet the harsh requirements of the high-temperature and low-viscosity fuel lubrication conditions for the comprehensive performance, adaptability, and durability of materials. Summary of the Invention

[0004] The object of the present invention is to disclose a polyetheretherketone composite material resistant to high-temperature fuel and its preparation method, so as to solve the problems of poor adaptability of existing polymer materials to high-temperature fuel, high-temperature strength loss and insufficient dimensional stability.

[0005] I. Preparation of polyetheretherketone composite material resistant to high-temperature fuel

[0006] The polyetheretherketone lubricating material resistant to high-temperature fuel of the present invention is prepared from the following raw materials and processes:

[0007] Raw material ratio: by volume: 50-94.9 parts of polyetheretherketone resin, 5-40 parts of mixed and ground carbon fiber, 0.1-5 parts of auxiliary components;

[0008] The present invention uses lightweight and high-strength polyetheretherketone as the polymer matrix, and the density of the polyetheretherketone resin is 1.20-1.45 g / cm 3 , and the melt flow rate is 5-20 cm 3 / 10 min.

[0009] Carbon fiber can be divided into polyacrylonitrile-based carbon fiber, pitch-based carbon fiber and viscose-based carbon fiber according to the raw material source. Their properties and characteristics are different, but they are often used alone in composite materials. The present invention uses polyacrylonitrile-based carbon fiber and mesophase pitch-based carbon fiber after grinding to obtain the same aspect ratio as the main reinforcing filler. Using the mixture of polyacrylonitrile-based carbon fiber and mesophase pitch-based carbon fiber as the raw material, in the mixed and ground carbon fiber, by volume: 55-98 parts of polyacrylonitrile-based carbon fiber, with a tensile strength of 4-5.2 GPa and a thermal conductivity of 5-155 W / (m·K), having high strength and modulus, mainly using its high strength and high modulus to improve the mechanical properties and wear resistance of the composite material; 2-45 parts of mesophase pitch-based carbon fiber, with a tensile strength of 2.4-3.7 GPa and a thermal conductivity of 640-1200 W / (m·K), having a much higher thermal conductivity than the former, focusing on promoting the dissipation of environmental heat and frictional heat in the composite material in high-temperature fuel, thereby controlling the damage of high-temperature fuel to strength, wear resistance and dimensional stability during long-term service. The two kinds of mixed carbon fibers are ground in a ball mill at a rotational speed of 50-150 rpm and a ball-to-material mass ratio of 5-50:1 for 5-120 min, and then have a uniform and unified property after sieving. After testing, the diameter of the mixed and ground carbon fiber obtained after sieving is 6.2-8.5 μm, and the aspect ratio is 3-50.

[0010] After introducing carbon fiber into the polymer composite material, it inevitably leads to too high a linear expansion coefficient and unstable dimensions after heating. For this reason, the present invention introduces a certain amount of auxiliary components, all of which are modified fillers with low expansion coefficients. The auxiliary components are one or more of silica, wollastonite, polytetrafluoroethylene, polyimide, and alumina, with a particle size of 3-80 μm.

[0011] Preparation process: The polyetheretherketone resin, mixed and ground carbon fiber, and auxiliary components are fully mixed, dried, and then placed in a mold. Sintering is carried out at a temperature of 350 - 400 °C and a pressure of 0.2 - 2 MPa / mm for 30 - 300 min to obtain a polyetheretherketone composite material resistant to high-temperature fuel. There are no special regulations for the mixing and drying equipment and processes in the present invention, and well-known technical solutions in the art can be adopted.

[0012] In the sintering and forming process, through the regulation of sintering temperature, pressure, and time, the composite material is fully melted to ensure that its high comprehensive performance is not weakened by the hot forming process. Particularly for the problem that the polyetheretherketone lubricating material is prone to adhesion to the mold due to high thermal conductivity, the problem of difficult demolding is solved by coating a special demolding agent on the mold surface. The solid demolding agent is one of boron nitride, graphite, wollastonite, and polytetrafluoroethylene.

[0013] Through the grinding and compound use of carbon fiber in the present invention, the thermal conductivity, reinforcement, and wear resistance of the composite material are significantly improved. Combined with the design of a small amount of auxiliary components, a polyetheretherketone-based lubricating material with comprehensive technical advantages such as high temperature resistance, aging resistance, erosion resistance, high strength, low friction, high wear resistance, low expansion, and easy processing is finally provided. It is applicable to bearings, labyrinth seals, stuffing boxes, throat bushings, etc. in the fuel control system of aeroengines, and can also be applied to friction components in automotive engines that are in direct contact with fuel and various friction components under the lubrication of other high-temperature and low-viscosity media.

[0014] II. Properties of the polyetheretherketone lubricating material resistant to high-temperature fuel

[0015] 1. Tensile strength test

[0016] After processing the formed blank into dumbbell shapes with different thicknesses of 80 mm × 10 mm, the test is carried out in accordance with standard GB / T 1040.2 - 2006. The gauge length of the specimen is 25 mm, and the tensile rate is 50 mm / min. The experimental results are shown in Table 1. The tensile strength of the polyetheretherketone composite material resistant to high-temperature fuel is 120 - 170 MPa.

[0017] 2. Coefficient of linear expansion test

[0018] The formed blank is processed into a long cylinder with a diameter of Φ7 mm and a length of 30 mm, and the test is carried out in accordance with standard GB / T 2572 - 2005. The test temperature range is 25 - 160 °C, and the heating rate is 2 °C / min. The average value of 3 test results is taken. The experimental results are shown in Table 1. The coefficient of linear expansion of the polyetheretherketone composite material resistant to high-temperature fuel is (0.8 - 3.9) × 10 -5 / °C.

[0019] 3. Thermal conductivity test

[0020] The formed blank is processed into a round sheet with a diameter of 10 mm and a thickness of 1 - 3 mm. The thermal conductivity is measured using an LFA457 thermal conductivity analyzer. By measuring the temperature change curve on the back of the sample caused by the instantaneous thermal radiation of the laser pulse, the thermal conductivity is calculated using the simplified physical model formula and automatically output by the equipment. The average value of 3 test results is taken. The experimental results are shown in Table 1, and the thermal conductivity of the polyetheretherketone composite material resistant to high-temperature fuel is 1.0 - 4.7 W / (m·K).

[0021] 4. Friction and Wear Performance Test

[0022] The test equipment is an MR-H5D high-speed ring-block friction and wear tester. The formed blank is processed into a block specimen with dimensions of 12×12×19 mm and paired with a 316 stainless steel ring. The contact mode between the two is surface-to-surface contact, the contact load is 600 N, the relative motion mode is rotational sliding, the rotational speed is 600 rpm (~1.54 m / s), the single test running time is 2 h, and the test medium is aviation fuel whose performance meets the standard GB 6537 - 2006. The test results are at least the average value of 3 test results. The experimental results are shown in Table 1, and the wear rate of the polyetheretherketone composite material resistant to high-temperature fuel is (0.25 - 0.73) × 10 -8 mm 3 / Nm, and the friction coefficient is 0.06 - 0.08.

[0023] 5. Fuel Compatibility Test

[0024] After the formed blank is processed into a specified shape, it is immersed in the fuel medium and aged at 130 °C for 500 h. An electronic balance with a precision of 0.0001 g is used to measure its change. The tensile strength, wear rate, and friction coefficient after aging in high-temperature fuel are tested according to the above 1 and 4. The experimental results are shown in Table 1. After the polyetheretherketone composite material resistant to high-temperature fuel is aged in high-temperature fuel at 130 °C for 500 h, the mass loss is 0.4 - 1.0%, and the tensile strength loss is 0.01 - 1.0%; the wear rate after aging is (0.27 - 0.80) × 10 -8 mm 3 / Nm, and the friction coefficient is 0.02 - 0.06.

[0025] Table 1 Performance Test Results of Polyetheretherketone Composite Material

[0026]

[0027] In summary, the present invention uses polyether ether ketone as the matrix, and uses polyacrylonitrile-based carbon fiber and mesophase pitch-based carbon fiber as the main reinforcing fillers after grinding to obtain the same aspect ratio. Among them, polyacrylonitrile-based carbon fiber focuses on improving the mechanical properties and wear resistance of the composite material, while mesophase pitch-based carbon fiber focuses on promoting the dissipation of environmental heat and frictional heat in high-temperature fuel in the composite material. Through the compounding and synergistic effect of the two carbon fibers, the material has high tensile strength, high thermal conductivity and low wear rate. In combination with a small amount of low-expansion auxiliary components, the problem of too high linear expansion coefficient and unstable dimensions caused by the introduction of carbon fibers is avoided, so that the material has a low linear expansion coefficient. In terms of the preparation method, through the mixed grinding of the two carbon fibers, they have similar sizes, so as to realize the uniform dispersion of the polyether ether ketone matrix, thereby realizing the synergistic effect.

[0028] On this basis, through the regulation of the sintering temperature, pressure and time, the composite material is fully melted to ensure that the high comprehensive performance is not weakened by the thermoforming process. Especially for the problem that the polyether ether ketone composite material is easy to adhere to the mold due to its high thermal conductivity, the problem of difficult demolding is solved by coating a special demolding agent on the mold surface. The test results show that after 500h of high-temperature fuel aging, the mass, size, mechanical strength and friction and wear performance of the polyether ether ketone composite material remain stable, and the attenuation amplitude is controllable. The polyether ether ketone composite material provided by the present invention that is resistant to high-temperature fuel is suitable for bearings, labyrinth seals, orifices, throat bushings, etc. in the fuel control system of aeroengines, and can also be applied to friction components in automotive engines that are in direct contact with fuel and various friction components under the lubrication of other high-temperature and low-viscosity media. Detailed implementation mode

[0029] The following further illustrates the preparation and performance of the polyether ether ketone lubricating material resistant to high-temperature fuel of the present invention in combination with examples. The materials and reagents used in the examples are all commercially available.

[0030] Example 1

[0031] (1) 900 g of polyacrylonitrile-based carbon fiber raw filaments (tensile strength 5.2 GPa, thermal conductivity 10 W / (m•K)) and 100 g of mesophase pitch-based carbon fiber raw filaments (tensile strength 2.4 GPa, thermal conductivity 800 W / (m•K)) were ground in a ball mill at a rotational speed of 50 rpm and a ball-to-material mass ratio of 25 for 5 min, and then passed through a 500-mesh sieve to obtain 970 g of mixed ground carbon fiber (diameter 7.2 μm, aspect ratio 50);

[0032] (2) Take 550 g of polyether ether ketone resin (density 1.25 g / cm 3 , melt flow rate 5 cm 3After mixing 440 g of mixed ground carbon fiber and 10 g of silica (particle size 5 μm) evenly and drying, 491 g of the mixed material is taken and placed in a mold, and the surface of the mold is coated with graphite release agent;

[0033] (3) Sinter at 375 °C under a pressure of 0.2 MPa / mm for 120 min to obtain a polyetheretherketone composite material for high-temperature resistant fuel with a diameter of 120 mm and a thickness of 30 mm. The performance test results are shown in Table 2.

[0034] Example 2

[0035] (1) 550 g of polyacrylonitrile-based carbon fiber precursor (tensile strength 5.0 GPa, thermal conductivity 5 W / (m•K)) and 450 g of mesophase pitch-based carbon fiber precursor (tensile strength 3.0 GPa, thermal conductivity 640 W / (m•K)) are ground in a ball mill at a rotation speed of 100 rpm and a ball-to-material mass ratio of 35 for 30 min, and then passed through an 800-mesh sieve to obtain 966 g of mixed ground carbon fiber (diameter 7.5 μm, aspect ratio 30);

[0036] (2) Take 650 g of polyetheretherketone resin (density 1.32 g / cm 3 , melt flow rate 7 cm 3 / 10 min), 300 g of mixed ground carbon fiber, and 50 g of wollastonite (particle size 50 μm), mix them evenly and dry. After drying, take 156 g of the mixed material and place it in a mold, and the surface of the mold is coated with boron nitride release agent;

[0037] (3) Sinter at 380 °C under a pressure of 0.5 MPa / mm for 120 min to obtain a polyetheretherketone composite material for high-temperature resistant fuel with a diameter of 120 mm and a thickness of 10 mm. The performance test results are shown in Table 2.

[0038] Example 3

[0039] (1) 650 g of polyacrylonitrile-based carbon fiber precursor (tensile strength 4.7 GPa, thermal conductivity 135 W / (m•K)) and 350 g of mesophase pitch-based carbon fiber precursor (tensile strength 3.5 GPa, thermal conductivity 1100 W / (m•K)) are ground in a ball mill at a rotation speed of 150 rpm and a ball-to-material mass ratio of 50 for 100 min, and then passed through a 10,000-mesh sieve to obtain 930 g of mixed ground carbon fiber (diameter 6.9 μm, aspect ratio 7);

[0040] (2) Take 1400 g of polyetheretherketone resin (density 1.35 g / cm 3 , melt flow rate 12 cm 3After mixing 560 g of mixed ground carbon fiber and 40 g of polytetrafluoroethylene (particle size 60 μm) evenly and drying, 1475 g of the mixed material is taken and placed in a mold after drying. The surface of the mold is coated with graphite release agent;

[0041] (3) Sinter at 385 °C and 1.0 MPa / mm for 300 min to obtain a polyetheretherketone composite material for high-temperature fuel with a diameter of 300 mm and a thickness of 10 mm. The performance test results are shown in Table 2.

[0042] Table 2 Performance of Polyetheretherketone Lubricating Materials for High-Temperature Fuel Obtained in Examples 1-3

[0043]

[0044] As can be seen from Table 2, the polyetheretherketone lubricating material for high-temperature fuel provided by the present invention has relatively high tensile strength and thermal conductivity, and relatively low linear expansion coefficient and friction coefficient. After long-term aging in high-temperature fuel, the change in mass and tensile strength is small, and the friction coefficient and wear rate still remain at a relatively low level, indicating that the material has relatively high aging resistance to high-temperature fuel. The ratio of polyacrylonitrile-based carbon fiber to mesophase pitch-based carbon fiber is the key parameter for regulating the strength and thermal conductivity of the composite material. A high content of polyacrylonitrile-based carbon fiber helps to obtain high tensile strength, but it will also cause a decrease in thermal conductivity; on the contrary, a high content of mesophase pitch-based carbon fiber helps to improve thermal conductivity, but it will also cause a decrease in tensile strength and an increase in linear expansion coefficient at the same time. By reasonably adjusting the content of the two, the comprehensive performance of the composite material can be balanced and regulated to meet the all-round requirements of harsh fuel applications for strength, thermal conductivity, dimensional stability and friction and wear performance.

[0045] Comparative Example 1

[0046] (1) Grind 1000 g of polyacrylonitrile-based carbon fiber raw filaments (tensile strength 5.2 GPa, thermal conductivity 10 W / (m•K)) in a ball mill at a rotation speed of 50 rpm and a ball-to-material mass ratio of 25 for 5 min, and then pass through a 500-mesh sieve to obtain 970 g of mixed ground carbon fiber (diameter 7.2 μm, aspect ratio 50)

[0047] (2) Take 550 g of polyetheretherketone resin (density 1.25 g / cm 3 , melt flow rate 5 cm 3 / 10 min), 440 g of polyacrylonitrile-based carbon fiber raw filaments (tensile strength 5.2 GPa, thermal conductivity 10 W / (m•K)) and 10 g of silicon dioxide (particle size 5 μm), mix evenly and dry. After drying, take 485 g of the mixed material and place it in a mold. The surface of the mold is coated with graphite release agent;

[0048] (3) After sintering for 120 min at a temperature of 375 °C and a pressure of 0.2 MPa / mm, a polyetheretherketone composite material resistant to high temperature fuel oil with a diameter of 120 mm and a thickness of 30 mm was obtained. The performance test results are shown in Table 2.

[0049] Comparative Example 2

[0050] (1) 450 g of mesophase pitch-based carbon fiber precursor (tensile strength 3.0 GPa, thermal conductivity 640 W / (m·K)) was ground in a ball mill at a speed of 100 rpm and a ball-to-material mass ratio of 35 for 30 min, and then passed through an 800-mesh sieve to obtain 446 g of mixed ground carbon fiber (diameter 7.5 μm, aspect ratio 30);

[0051] (2) Take 650g of polyetheretherketone resin (density 1.32g / cm 3 , melt flow rate is 7cm 3 / 10min), 300g of mesophase pitch-based carbon fiber precursor (tensile strength 3.0GPa, thermal conductivity 640W / (m·K), 50g of wollastonite (particle size 50μm) are fully mixed and dried, and after drying, 155g of the mixture is placed in the mold. The surface of the mold is coated with a boron nitride release agent;

[0052] (3) The composite material was sintered at a temperature of 380°C and a pressure of 0.5 MPa / mm for 120 min to obtain a polyetheretherketone composite material with a diameter of 120 mm and a thickness of 10 mm. The performance test results are shown in Table 2.

[0053] Comparative Example 3

[0054] (1) 650 g of polyacrylonitrile-based carbon fiber precursor (tensile strength 4.7 GPa, thermal conductivity 135 W / (m•K)) and 350 g of mesophase asphalt-based carbon fiber precursor (tensile strength 3.5 GPa, thermal conductivity 1100 W / (m•K)) were mixed evenly;

[0055] (2) Take 1400g of polyetheretherketone resin (density 1.35g / cm 3 , melt flow rate is 12cm 3 / 10min), 560g of mixed and ground carbon fiber, 40g of polytetrafluoroethylene (particle size 60μm) are fully mixed and dried, and after drying, 1475g of the mixed material is placed in a mold, and the surface of the mold is coated with a graphite release agent;

[0056] (3) Sintering for 300 min at a temperature of 385°C and a pressure of 1.0 MPa / mm to obtain a polyetheretherketone composite material with a diameter of 300 mm and a thickness of 10 mm. The performance test results are shown in Table 3.

[0057] Table 3 Properties of the polyether ether ketone composites obtained in Comparative Examples 1 to 3

[0058]

[0059] As can be seen from Table 3, (1) when only polyacrylonitrile-based carbon fiber is used for enhancing wear resistance modification alone, due to the lack of a heat conduction phase in the composite material, the mass change after high-temperature fuel aging increases to 1.5%, the strength loss reaches 3.0%, the wear rate increases to 1.2×10 -8 mm 3 / N·m, and the friction coefficient increases to 0.07; (2) when only mesophase pitch-based carbon fiber is used for heat conduction modification alone, due to the lack of an enhancing wear-resistant phase in the composite material, the tensile strength of the composite material itself decreases to 100 MPa, the wear rate increases to 1.9×10 -8 mm 3 / N·m, and the friction coefficient increases to 0.10; (3) when both carbon fibers are added but not ground, the uneven distribution of carbon fibers and the insufficient interfacial bonding with the polyether ether ketone resin matrix lead to an increase in the mass change of the composite material to 1.3% after high-temperature aging, the strength loss reaches 2.5%, and the wear rate increases to 1.0×10 -8 mm 3 / N·m, and none of them can reach the performance range of the materials described in the present invention simultaneously.

Claims

1. A method for preparing a polyetheretherketone composite material resistant to high temperature fuel, characterized in that: The invention comprises the following raw materials and preparation processes: Raw material ratio: by volume: 50-94.9 parts of polyetheretherketone resin, 5-40 parts of mixed and ground carbon fiber, and 0.1-5 parts of auxiliary components; The mixed ground carbon fiber is calculated by weight, and a mixture of 55-98 parts of polyacrylonitrile-based carbon fiber and 2-45 parts of mesophase pitch-based carbon fiber is taken as a raw material, and ground in a ball mill at a speed of 50-150 rpm and a ball-to-material mass ratio of 5-50:1 for 5-120 minutes, and then sieved to obtain; The tensile strength of polyacrylonitrile-based carbon fibers is 4~5.2 GPa, and the thermal conductivity is 5~155 W / (m·K); The tensile strength of mesophase pitch-based carbon fibers is 2.4~3.7 GPa, and the thermal conductivity is 640~1200 W / (m·K); Preparation process: The polyetheretherketone resin, mixed ground carbon fiber and auxiliary components are fully mixed, placed in a mold after drying, and sintered for 30 to 300 minutes at a temperature of 350 to 400°C and a pressure of 0.2 to 2 MPa / mm to obtain a polyetheretherketone composite material resistant to high temperature fuel.

2. The method for preparing a polyetheretherketone composite material resistant to high temperature fuel as claimed in claim 1, characterized in that: The density of the polyetheretherketone resin is 1.20-1.45 g / cm 3 , melt flow rate is 5~20cm 3 / 10min.

3. The method for preparing a polyetheretherketone composite material resistant to high temperature fuel as claimed in claim 1, characterized in that: The mixed and ground carbon fibers have a diameter of 6.2-8.5 μm and an aspect ratio of 3-50.

4. The method for preparing a polyetheretherketone composite material resistant to high temperature fuel as claimed in claim 1, characterized in that: The auxiliary component is one or more of silicon dioxide, wollastonite, polytetrafluoroethylene, polyimide, and aluminum oxide; and its particle size is 3-80 μm.

5. The method for preparing a polyetheretherketone composite material resistant to high temperature fuel as claimed in claim 1, characterized in that: The contact surface between the mold and the material is coated with a solid release agent, which is one of boron nitride, graphite, wollastonite and polytetrafluoroethylene.

6. A polyetheretherketone composite material resistant to high temperature fuel prepared by the method as claimed in claim 1.

7. Use of the polyetheretherketone composite material resistant to high temperature fuel prepared by the method of claim 1 in friction parts of fuel control systems in the aerospace and automotive fields.

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