A high-temperature-resistant wave-absorbing structure integrated ceramic matrix composite material and its preparation method

A composite material, high temperature resistant technology, applied in the stealth field of high-speed aircraft, can solve the problems of high dielectric constant, wave absorbing performance and mechanical performance need to be further improved, complex structure, etc., to achieve the effect of saving manpower and material resources

Active Publication Date: 2022-05-10
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Chinese patent CN201910428518.8 discloses a high-temperature-resistant wave-absorbing material with a multi-dielectric layer structure, but its wave-absorbing performance and mechanical properties still need to be further improved
Chinese patent CN201811474229.0 discloses an ultra-broadband wave-absorbing structure compatible with temperature resistance and mechanical properties and its preparation method. The structure consists of an inorganic anti-oxidation layer, a ceramic matrix composite material layer, an airgel layer, Periodic structure layer, ceramic matrix composite material layer, magnetic wave-absorbing material layer, electromagnetic shielding layer, etc., its disadvantage is that its mechanical properties such as interlayer shear strength and tensile strength need to be strengthened, and the structure is complex and the preparation cycle Longer, not conducive to continuous industrialization
Chinese patent CN201810851203.X discloses a rapid preparation method using SI+RMI technology to quickly prepare high-temperature structural wave-absorbing ceramic matrix composites, but the high content of SiC fiber preforms leads to high dielectric constant limited
Chinese patent CN201910410673.7 discloses a composite wave-absorbing material with porous SiC ceramics as the basic skeleton and graphene filled in porous silicon carbide. Chinese patent CN202010702661.4 uses a wet spinning process to prepare carbon fiber composite wave-absorbing materials. Chinese patent CN201710051339.8 discloses a MoSi 2 / Al 2 o 3 High temperature resistant microwave absorbing materials, but the mechanical properties and high temperature resistance of the above composite materials are still poor

Method used

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  • A high-temperature-resistant wave-absorbing structure integrated ceramic matrix composite material and its preparation method
  • A high-temperature-resistant wave-absorbing structure integrated ceramic matrix composite material and its preparation method
  • A high-temperature-resistant wave-absorbing structure integrated ceramic matrix composite material and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0055] The service environment is: the airflow velocity is Mach 3, the maximum airflow temperature is 1500°C (the average temperature is 1300°C), and the reflectivity in the X-band range is better than -10dB; the tensile strength of the material is 200MPa; (the above parameters are Boundary conditions of the model)

[0056] COMSOL Multiphysics and finite element full-wave analysis software HFSS software are used for simulation calculation. According to the actual situation, since the electromagnetic wave is projected from infinity to the surface of the material, it can be regarded as a plane wave. Therefore, during the simulation, the incident electromagnetic wave at the port is set as a plane wave. , the electric field polarization direction is parallel to the fiber axis, and the material itself has a periodic structure in the X direction, so periodic boundary conditions are set on the left and right sides of the model. The bottom end of the model is set as a perfect electric...

Embodiment 2

[0067] The service environment is: the airflow velocity is Mach 5, the maximum airflow temperature is 1500 degrees Celsius (the average temperature is 1300 degrees Celsius), and the reflectivity in the X-band range is better than -10dB; the tensile strength of the material is 200MPa;

[0068] COMSOL Multiphysics and finite element full-wave analysis software HFSS software are used for simulation calculation. According to the actual situation, since the electromagnetic wave is projected from infinity to the surface of the material, it can be regarded as a plane wave. Therefore, during the simulation, the incident electromagnetic wave at the port is set as a plane wave. , the electric field polarization direction is parallel to the fiber axis, and the material itself has a periodic structure in the X direction, so periodic boundary conditions are set on the left and right sides of the model. The bottom end of the model is set as a perfect electric conductor to be equivalent to a ...

Embodiment 3

[0079] Other conditions are the same as in Example 1, except that the weaving method is 45° twill weaving, and the detailed arrangement relationship between fibers is the alternate mixed weaving mode of lossy fibers and wave-transparent fibers; after weaving is completed, a mixed weaving prefabricated body is obtained ; After impregnation-cracking, the properties of the resulting product are shown in Table 6;

[0080] .

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Abstract

The invention belongs to the technical field of high-speed aircraft stealth, and in particular relates to a high-temperature-resistant wave-absorbing structure integrated ceramic matrix composite material and a preparation method thereof. The ceramic matrix composite material is composed of a preform and high-loss ceramics; the high-loss ceramics are filled in the preform and coated on the preform; the preform is mixed and woven by high-loss fibers and wave-transmitting ceramic fibers made. In the present invention, the high-loss fiber and the wave-transmitting ceramic fiber are reasonably matched and woven into a prefabricated body with a special structure, and the subsequent introduction of an appropriate type and amount of matrix ceramics can effectively control the microwave electromagnetic characteristics and greatly improve the wave-absorbing performance. Realize the synergy of mechanical properties. The material structure design of the invention is scientific and reasonable, and the air-conditioning property is strong; the preparation process is simple and controllable, and the obtained product has excellent performance, and is convenient for industrial application.

Description

technical field [0001] The invention belongs to the technical field of high-speed aircraft stealth, and in particular relates to a high-temperature-resistant wave-absorbing structure integrated ceramic [0002] Composite materials and methods for their preparation. Background technique [0003] The development of advanced weapons and equipment puts forward an urgent need for radar stealth of high-temperature components. The research and application of high-temperature-resistant radar absorbing materials has become one of the important problems restricting the development of stealth technology for weapons and equipment. The stealth parts of high-speed aircraft are faced with complex service environments such as high temperature, high strength, and high vibration, which put forward strict requirements on the temperature resistance, stealth performance, and mechanical properties of components. The bonding materials with multiple functions can no longer meet these functions at t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/80C04B35/565C04B35/58C04B35/81
CPCC04B35/573C04B35/571C04B35/58C04B2235/5248C04B2235/5244C04B2235/5224C04B2235/524C04B2235/5228C04B2235/46C04B2235/483C04B2235/444C04B2235/465C04B2235/44C04B2235/96C04B2235/9607
Inventor 阳海棠罗衡
Owner CENT SOUTH UNIV
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