The electromagnetic absorbing properties of plasma-sprayed TiC/Al₂O₃ coatings under oblique incident microwave irradiation

High performance absorbing coatings attract great interest because of the urgent demand for radar stealth technology. However, most reported absorbing coatings focused on the incident microwave were perpendicular to the surface of the coatings. Here, a kind of absorber of TiC/Al₂O₃ was prepared by plasma spraying method and the influence of TiC content and oblique incident microwave irradiation on the absorbing properties of TiC/Al₂O₃ were reported. The absorbing performance firstly increased and then decreased with increasing the TiC content due to the impedance matching and attenuation constant cannot match well at the same time. Meanwhile, compared with TE polarization, TM polarization of the plasma-sprayed TiC/Al₂O₃ coatings was more sensitive to the incident angle. This study demonstrates the feasibility of plasma-sprayed TiC/Al₂O₃ absorbing coatings for electromagnetic applications.