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

Rong Li,Yuchang Qing

doi:10.3390/nano11102640

Rong Li, Yuchang Qing

Open Access

https://doi.org/10.3390/nano11102640

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Abstract

Carbon nanotube (CNT)-reinforced Y2O3/ZrB2 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 Y2O3/ZrB2/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 ZrB2 and CNT content increased. The Y2O3/ZrB2/CNT hybrids corresponded to a ZrB2 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 ZrB2 content can tune the complex permittivity and absorption performance of the Y2O3/ZrB2/CNT ceramics.

Highlights

Electromagnetic (EM) pollution has become a serious problem to human health and the environment due to the growth of the electronic industry and radio communication technologies [1,2,3]
The different Y2 O3 /ZrB2 /Carbon nanotube (CNT) ceramics were only composed of Y2 O3, ZrB2, and CNT
The different Y2O3/ZrB2/CNT ceramics were only composed of Y2O3, ZrB2, and CNT crystalline phases

Summary

Introduction

Electromagnetic (EM) pollution has become a serious problem to human health and the environment due to the growth of the electronic industry and radio communication technologies [1,2,3] To solve this problem, designing and fabricating suitable microwave absorption materials is an urgent task for researchers in the field of materials science [4,5,6,7,8]. Zirconium diboride (ZrB2 ) has a high strength and electrical conductivity (∼6 × 104 Ω−1 ·cm−1 ), high melting point (3200 ◦ C), good thermal shock resistance, and good oxidation resistance at a high temperature It has attracted attention as a microwave-absorption material [14]. Nanomaterials 2021, 11, 2640 structure and porosity and obtain a high bonding strength; this has become a key method for preparing ZrB2 -based ceramic coatings. Y2 O3 /ZrB2 /CNT ceramics prepared via plasma-spraying could provide a theoretical basis and technical support for mass production in the field of ceramic-based high-temperature materials

Experimental

Results and Discussion

ZrB and2 CNT were were evenly mixed

SEM ofthat

O3 decreased

Conclusions