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Broadband wave transmission multilayer structural ceramic-based composite material and method for preparing same

A composite material and multi-layer structure technology, applied in the field of composite materials, can solve the problems of inability to use high temperature use environment, limited broadband wave transmission performance, low curing temperature, etc., to achieve excellent broadband wave transmission performance, without affecting wave transmission performance, The effect of excellent dielectric properties

Active Publication Date: 2019-04-23
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH +1
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  • Claims
  • Application Information

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Problems solved by technology

[0002] At present, broadband wave-transparent composite materials mainly adopt a sandwich structure composed of multi-layer organic media (skin, low-density foam or honeycomb core layer, etc.), which cannot be used in high-temperature environments above 600 °C due to the limitation of high-temperature resistance of organic materials. Need to upgrade to inorganic materials with better high temperature resistance
[0003] At present, the research on inorganic broadband wave-transmitting materials mostly draws on the multi-layer combination of organic interlayer structures, and develops low-density inorganic dielectric materials such as quartz, silicon nitride, alumina, and mullite as low-dielectric core layers. Using a high-strength relatively dense thin layer as the skin to replace the organic medium to increase the operating temperature of the broadband wave-transmitting material, but the broadband wave-transmitting performance of this three-layer structure is limited (the bandwidth is only about 1 ~ 2G), it is difficult Meet the needs of high temperature broadband wave penetration
Moreover, organic adhesives are generally used to connect the layers, and the curing temperature is low. At high temperatures (above 300°C), organic matter will decompose and carbonize, and the reliability at high temperatures is poor.

Method used

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  • Broadband wave transmission multilayer structural ceramic-based composite material and method for preparing same
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  • Broadband wave transmission multilayer structural ceramic-based composite material and method for preparing same

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preparation example Construction

[0039] The embodiment of the present invention also provides a method for preparing a broadband wave-transmissive multilayer structure ceramic matrix composite material, comprising the following steps:

[0040] (1) Stack odd-numbered layers of inorganic wave-transparent fiber-reinforced ceramic matrix composites in order of increasing dielectric constant from the outer layer to the middle layer, and apply inorganic wave-transparent coatings between adjacent two layers before stacking;

[0041] (2) Apply pressure to make each layer in close contact, and perform heat treatment to obtain a multilayer structure ceramic matrix composite material.

[0042] The embodiment of the present invention is used to prepare the broadband wave-transmitting multilayer structure ceramic matrix composite material provided in the above embodiment. For the description of the product, refer to the above embodiment and will not repeat it here.

[0043] In an optional embodiment, in step (1), five lay...

Embodiment 1

[0052] An embodiment of the present invention provides a silicon nitride fiber reinforced ceramic matrix composite material with a 5-layer structure, and its preparation method includes:

[0053] Such as figure 1 As shown, three silicon nitride fiber-reinforced ceramic matrix composites with different dielectric constants were prepared respectively, and were combined into a five-layer structure in the order of low-medium-high-medium-low dielectric constants, as shown in figure 2 As shown, the dielectric constant of the middlemost high dielectric layer is 4.0, the dielectric constant of the two layers adjacent to the middle layer (middle dielectric layer) on both sides is equal to 2.8, and the dielectric constant of the two outer low dielectric layers is The electrical constant is equal to 1.8; the thickness of each layer of the five-layer structure is the same, both are 3.0mm, and the length and width are both 120×120mm. Spray the spray liquid (inorganic wave-transparent coa...

Embodiment 2

[0055] An embodiment of the present invention provides a silicon nitride fiber reinforced ceramic matrix composite material with a 5-layer structure, and its preparation method includes:

[0056] Three kinds of mullite fiber-reinforced ceramic matrix composites with different dielectric constants were prepared respectively, and they were combined into a five-layer structure in the order of low-medium-high-medium-low dielectric constant. The middle high dielectric layer The dielectric constant is 2.8, the dielectric constants of the two layers adjacent to the middle layer (intermediate dielectric layer) on both sides are equal to 1.8, and the dielectric constants of the two outer low dielectric layers are equal to 1.2; the five-layer structure each The thickness of the layers is the same, both are 5.0mm, and the length and width are both 150×150mm. Coat the surface of the material with quartz-based glass phase powder by spraying spray liquid on the connection surface between la...

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Abstract

The invention relates to a broadband wave transmission multilayer structural ceramic-based composite material and a method for preparing the same, and belongs to the technical field of composite materials. An odd number layers of inorganic wave transmission fiber reinforced ceramic-based composite materials are laminated to form the broadband wave transmission multilayer structural ceramic-based composite material. The dielectric constants of the odd number layers of inorganic wave transmission fiber reinforced ceramic-based composite materials are sequentially increased from outer layers to intermediate layers, and the various layers are fixedly adhered with one another by inorganic wave transmission coating. The broadband wave transmission multilayer structural ceramic-based composite material and the method have the advantages that the transmittance of the broadband wave transmission multilayer structural ceramic-based composite material at X / Ku / Ka wavebands (the maximum bandwidthscan be close to 50 G) can reach 80% at least, and the broadband wave transmission multilayer structural ceramic-based composite material can be used in high-temperature environments at the temperatures higher than 1000 DEG C for a long time and is high in reliability.

Description

technical field [0001] The invention relates to a ceramic-based composite material with a broadband wave-transparent multilayer structure and a preparation method thereof, belonging to the technical field of composite materials. Background technique [0002] At present, broadband wave-transparent composite materials mainly adopt a sandwich structure composed of multi-layer organic media (skin, low-density foam or honeycomb core layer, etc.), which cannot be used in high-temperature environments above 600 °C due to the limitation of high-temperature resistance of organic materials. It needs to be upgraded to an inorganic material with better high temperature resistance. [0003] At present, the research on inorganic broadband wave-transparent materials mostly draws on the multi-layer combination of organic sandwich structures, and develops low-density inorganic dielectric materials mainly composed of quartz, silicon nitride, alumina, and mullite as low-dielectric core layers....

Claims

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Application Information

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IPC IPC(8): B32B9/00B32B9/04B32B7/12B32B37/12B32B37/10B32B37/06
CPCB32B7/12B32B9/005B32B9/04B32B37/06B32B37/10B32B37/1284B32B2262/10B32B2307/304
Inventor 周军张敬义张大海
Owner AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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