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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.

Effects of Multi-Components on the Microwave Absorption and Dielectric Properties of Plasma-Sprayed Carbon Nanotube/Y2O3/ZrB2 Ceramics