Abstract
As a composite cermet material, the nickel coating on the surface of alumina particles has important application value because of its good electromagnetic wave absorption performance. In this study, nickel was deposited on the surface of alumina nanopowders by hydrothermal method and sintering method. The results show that the XRD results of nickel alumina show that Ni-Al2O3 nanoparticles has FCC face-centered cubic structure. The grain size is about 50 nm. The absorption characteristics of electromagnetic waves were measured at 2-18 GHz by HP 8722 es microwave network analyzer. The results show that Ni-Al2O3 nanoparticles has certain wave-absorbing properties.
Highlights
The surface effect, the volume effect and the quantum size effect of nano-magnetic metal powder make it produce many physical and chemical effects different from the bulk material, and have both free electron absorption and magnetic loss, and have excellent absorption properties for high frequency electromagnetic wave[1, 2]
Alumina is used as a group because of its good thermal stability and mechanical properties, and the powder coating obtained by hydrothermal method is simple and easy to obtain, which can be used as a coating in many fields of electromagnetic wave absorption
The microwave absorption performance should be analyzed to discuss the effect on the incorporation of nano aluminum embedded with Ni nanoparticles
Summary
The surface effect, the volume effect and the quantum size effect of nano-magnetic metal powder make it produce many physical and chemical effects different from the bulk material, and have both free electron absorption and magnetic loss, and have excellent absorption properties for high frequency electromagnetic wave[1, 2]. This is because, compared with the traditional particles, nano-particles are easy to generate interfacial polarization and multiple scattering or reflection of electromagnetic waves, because of their small particle size, large specific surface area, high surface atomic ratio and increased dangling bonds, which make them as an important wave absorption mechanism. Alumina is used as a group because of its good thermal stability and mechanical properties, and the powder coating obtained by hydrothermal method is simple and easy to obtain, which can be used as a coating in many fields of electromagnetic wave absorption
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