Sandwich-structure high-temperature-resistant radar wave-absorbing material and preparation method thereof

Abstract

The invention discloses a sandwich-structure high-temperature-resistant radar wave-absorbing material which sequentially comprises a dielectric layer I, a resistance-type periodic surface layer and a dielectric layer II from inside to outside, wherein the dielectric layer I and the dielectric layer II are made of an oxide fiber reinforced oxide based composite material; and the resistance-type periodical surface layer is composed of a high-temperature-resistant resistance coating with a periodic pattern. A preparation method comprises the following steps: preparing the composite material of the dielectric layer I and the high-temperature-resistant resistance coating; printing the high-temperature-resistant resistance coating on the composite material of the dielectric layer I by a screen printing technique, conducting drying and sintering to form the resistance-type periodic surface layer on the surface of the composite material of the dielectric layer I; and laying the composite material of the dielectric layer II on the surface of the resistance-type periodic surface layer to prepare the high-temperature-resistant radar wave-absorbing material. The high-temperature-resistant radar wave-absorbing material can resist the high temperature of at least 1000 DEG C, and has the advantages of favorable high-temperature resistance and excellent oxidation resistance.

Description

technical field [0001] The invention relates to the field of radar absorbing materials, in particular to a high-temperature-resistant radar absorbing material with a sandwich structure and a preparation method thereof. Background technique [0002] According to the service temperature range, radar absorbing materials can be divided into two categories: normal temperature (operating temperature below 200°C) and high temperature. In contrast, the current research on normal-temperature radar absorbing materials is relatively mature, while the research on high-temperature radar absorbing materials is still in active exploration. [0003] Several high-temperature microwave-absorbing ceramic structures and their preparation methods have been publicly reported. Chinese patent No. ZL201110052115.1 discloses a three-layer silicon carbide composite absorbing ceramic and its preparation method. The reported absorbing ceramic consists of a matching layer, a loss layer and a reflective ...

AI Technical Summary

Problems solved by technology

However, the high-temperature absorbing ceramics disclosed above need to prepare silicon carbide fibers with different resistivities according to the different electrical performance requirements of each functional layer, which is difficult to realize and the cost is high; and the absorbing ceramics reported above are all multi-layer structures. , the process is more complicated and the process requirements are higher

In view of the problems existing in the above patents, Chinese Patent No. ZL201410128311.6 discloses a wave-absorbing ceramic made of a single-layer structure silicon carbide composite material and its preparation method. The structure is simple and the thickness is thin, but the controllability of the dielectric constant is not good Strong, it can only realize the absorbing function of a specific band, and the design space is small

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