Microwave absorbing ceramic of silicon carbide compound material and preparation method thereof

A technology of composite materials and silicon carbide, which is applied in the field of radar absorbing ceramics, can solve problems such as difficulty in achieving gradient distribution of dielectric properties, poor toughness of particle-reinforced ceramic materials, and difficulty in preparing large and complex components, so as to achieve good absorption of electromagnetic waves and lighten the product. The effect of weight and simple structure

Active Publication Date: 2011-10-12
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0002] The radar absorbing ceramic materials currently developed are mainly made of ceramic micropowder as the radar absorber, and are prepared by hot pressing process, such as Si/C/N ceramic particle reinforced LAS glass, mullite, Si 3 N 4 and other ceramic materials, but these materials have the following disadvantages: 1) Dielectric properties are difficult to achieve gradient distribution, and the radar absorption frequency band is narrow; 2) Particle-reinforced ceramic materials have poor toughness and are prone to catastrophic failure; 3) Hot pressing process Difficult to prepare large and complex

Method used

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  • Microwave absorbing ceramic of silicon carbide compound material and preparation method thereof
  • Microwave absorbing ceramic of silicon carbide compound material and preparation method thereof
  • Microwave absorbing ceramic of silicon carbide compound material and preparation method thereof

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Embodiment 1

[0029] a kind of like figure 1 , figure 2 The wave-absorbing ceramics of the silicon carbide composite material shown in the present invention is a multi-functional layer superposition structure including a matching layer 1, a loss layer 2, a dielectric layer 3 and a reflection layer 4, and the matching layer 1, the loss layer 2 and the dielectric layer Layer 3 is composed of continuous silicon carbide fiber-reinforced silicon carbide-based composite material, and reflective layer 4 is composed of continuous carbon fiber-reinforced silicon carbide-based composite material. The continuous silicon carbide fiber and continuous carbon fiber used as reinforcing materials in each functional layer have different electrical resistances. Among them, the functional layers from outside to inside are: matching layer 1, lossy layer 2, dielectric layer 3 and reflective layer 4, the resistivity of the continuous silicon carbide fiber in the outer matching layer 1 is the largest, and the inn...

Embodiment 2

[0045] a kind of like figure 1 The wave-absorbing ceramics of the silicon carbide composite material shown in the present invention is a multi-functional layer superposition structure including a matching layer 1, a loss layer 2, a dielectric layer 3 and a reflection layer 4, and the matching layer 1, the loss layer 2 and the dielectric layer Layer 3 is composed of continuous silicon carbide fiber-reinforced silicon carbide-based composite material, and reflective layer 4 is composed of continuous carbon fiber-reinforced silicon carbide-based composite material. The continuous silicon carbide fiber and continuous carbon fiber used as reinforcing materials in each functional layer have different electrical resistances. Among them, the functional layers from outside to inside are: matching layer 1, lossy layer 2, dielectric layer 3 and reflective layer 4, the resistivity of the continuous silicon carbide fiber in the outer matching layer 1 is the largest, and the inner reflective...

Embodiment 3

[0054] a kind of like figure 1 The wave-absorbing ceramics of the silicon carbide composite material shown in the present invention is a multi-functional layer superposition structure including a matching layer 1, a loss layer 2, a dielectric layer 3 and a reflection layer 4, and the matching layer 1, the loss layer 2 and the dielectric layer Layer 3 is composed of continuous silicon carbide fiber-reinforced silicon carbide-based composite material, and reflective layer 4 is composed of continuous carbon fiber-reinforced silicon carbide-based composite material. The continuous silicon carbide fiber and continuous carbon fiber used as reinforcing materials in each functional layer have different electrical resistances. Among them, the functional layers from outside to inside are: matching layer 1, lossy layer 2, dielectric layer 3 and reflective layer 4, the resistivity of the continuous silicon carbide fiber in the outer matching layer 1 is the largest, and the inner reflective...

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Abstract

The invention discloses microwave absorbing ceramic of a silicon carbide compound material and a preparation method thereof. The microwave absorbing ceramic has a multifunctional layer laminated structure which comprises a matching layer, a depletion layer, a dielectric layer and a reflecting layer, wherein the matching layer, the depletion layer and the dielectric layer are respectively made of a continuous silicon carbide fiber reinforced silicon carbide-based compound material; the reflecting layer is made of a continuous carbon fiber reinforced silicon carbide-based compound material; andcontinuous silicon carbide fiber and continuous carbon fiber have different electrical resistivity. The preparation method comprises the flowing steps of: selecting a reinforced material; preparing asizing agent; preparing a rough blank; and preparing a finished product. The microwave absorbing ceramic has a wider absorbing frequency band, a higher mechanical property and a heat-resistant function.

Description

technical field [0001] The invention mainly relates to the field of radar wave-absorbing ceramics, in particular to a wave-absorbing ceramic made of silicon carbide composite material with a multilayer structure and a preparation method thereof. Background technique [0002] The radar absorbing ceramic materials currently developed are mainly made of ceramic micropowder as the radar absorber, and are prepared by hot pressing process, such as Si / C / N ceramic particle reinforced LAS glass, mullite, Si 3 N 4 and other ceramic materials, but these materials have the following disadvantages: 1) Dielectric properties are difficult to achieve gradient distribution, and the radar absorption frequency band is narrow; 2) Particle-reinforced ceramic materials have poor toughness and are prone to catastrophic failure; 3) Hot pressing process It is difficult to prepare large and complex components. Continuous fiber reinforced ceramic matrix composites have the advantages of high tempera...

Claims

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Application Information

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IPC IPC(8): C04B35/565C04B35/80C04B35/622G21F1/06
Inventor 程海峰刘海韬王军周永江郑文伟
Owner NAT UNIV OF DEFENSE TECH
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