Dielectric and Infrared Properties of Plasma Sprayed Nano β-SiC/ Al₂O₃ Agglomerate Composite Absorbing Coatings

Abstract

In this paper, the nano-β-SiC/Al2O3 composite absorbing coatings produced by plasma spraying technology were reported. Where, β-SiC phase dissipates in the boundary of Al2O3 grains. Then, the relationship between microstructure and dielectric properties was built. Some results are shown as follows: with increasing of flatten ratio of particle and pores, the microwave reflectivity coefficient of composite absorbing coatings decreases and ranges to low frequency. And, there exists a threshold value, about 30wt% of nano β-SiC, the microwave reflectivity coefficient of composite absorbing coatings can reach to -8 dB. The infrared properties of β-SiC/ Al2O3composite absorbing coatings with experiment is about 0.6~0.8, respectively.

Design of An Ultra-Thin and Broadband Absorption Materials For Middle-Temperature Applications

“…The dielectric loss is mainly caused by electric conductivity, ion transition, ion vibration and ion deformation, etc. [16][17][18][19][20].…”