Effects of Multi-Components on the Microwave Absorption and Dielectric Properties of Plasma-Sprayed Carbon Nanotube/Y(2)O(3)/ZrB(2) Ceramics

Carbon nanotube (CNT)-reinforced Y(2)O(3)/ZrB(2) ceramics were fabricated via planetary ball milling and atmospheric-pressure plasma spraying for the first time. The phase composition, micromorphology, and electromagnetic (EM) wave absorption performance of the Y(2)O(3)/ZrB(2)/CNT hybrid was investigated from 8.2 to 12.4 GHz. Both the real and imaginary parts of the complex permittivity were enhanced as the ZrB(2) and CNT content increased. The Y(2)O(3)/ZrB(2)/CNT hybrids corresponded to a ZrB(2) content of 15 wt.%, and the CNT content was 2 wt.% and showed an exceptional EM wave absorption capability, with a minimum reflection loss of −25.7 dB at 1.9 mm thickness, and the effective absorption band was in a full X-band. These results indicate that an appropriate CNT or ZrB(2) content can tune the complex permittivity and absorption performance of the Y(2)O(3)/ZrB(2)/CNT ceramics.