Preparation method of composite high-temperature wave-absorbing ceramic with multilayer board structure

Abstract

The invention provides a preparation method of composite high-temperature wave-absorbing ceramic with a multilayer board structure. The method comprises the following steps: preparing and proportioning mesoporous silicon carbide, mesoporous silicon oxide, mesoporous alumina powder, a carbon material and a sintering aid, and designing a three-layer structure of a matching layer, a functional layer and an absorbing layer to realize broadband electromagnetic wave-absorbing performance; optimizing the thickness of each layer through CST simulation software based on a quarter wavelength matching principle; the integrity of the mesoporous structure is maintained by adopting wet mixing and freeze-drying processes; carrying out layered pre-pressing molding and specially treating interlayer connection; and material densification and interlayer bonding are realized in an inert atmosphere by adopting a pressureless sintering integral forming technology. The multilayer composite ceramic prepared by the method has the characteristics of intact mesoporous structure, firm interlayer bonding, wide electromagnetic wave absorption frequency band, high absorption efficiency, excellent high-temperature stability and the like, effectively overcomes the performance limitation of a single-layer structure wave-absorbing material, and is suitable for harsh environment application in the fields of aerospace, military electronic countermeasure and the like.

Images