TY - JOUR
T1 - Plasma-Sprayed Graphene Nanosheets/ZnO/Al2O3 Coatings with Highly Efficient Microwave Absorption Properties
AU - Liu, Xin
AU - Lu, Xiaolong
AU - Song, Ying
AU - Xia, Shaoqiu
AU - Ren, Ronghao
AU - Wang, Yongguang
AU - Zhao, Dong
AU - Wang, Mingdi
N1 - Publisher Copyright:
© 2021, ASM International.
PY - 2021/8
Y1 - 2021/8
N2 - Graphene nanosheets (GNSs)/ZnO/Al2O3 composite coatings with different GNSs content were prepared by air plasma spraying technique. The scanning electron microscope results show that the GNSs were homogeneously dispersed in the powders and coatings. The influence of different GNSs content on complex permittivity and microwave absorption properties have been systematically investigated at the frequency range from 8.2 to 12.4 GHz. The complex permittivity of the coating was improved with the increase in GNS content, due to the high conductivity and polarization loss of GNS. The GNSs/ZnO/Al2O3 coating with 15 wt.% GNSs in the thickness of 1.82 mm presented the most prominent microwave absorption properties, which exhibited strong absorption (minimum reflection loss of −45 dB) and the reflection loss ≤ −10 dB bandwidth at the frequency range of 11.2-12.0 GHz. Meanwhile, the hardness of the coating increased from 914.2 HV0.2 to 1057.3 HV0.2 with the introduced 15 wt.% GNSs. These results suggest that GNS can be a promising nanofiller to simultaneously improve the microwave absorption properties and mechanical properties of absorbing coatings.
AB - Graphene nanosheets (GNSs)/ZnO/Al2O3 composite coatings with different GNSs content were prepared by air plasma spraying technique. The scanning electron microscope results show that the GNSs were homogeneously dispersed in the powders and coatings. The influence of different GNSs content on complex permittivity and microwave absorption properties have been systematically investigated at the frequency range from 8.2 to 12.4 GHz. The complex permittivity of the coating was improved with the increase in GNS content, due to the high conductivity and polarization loss of GNS. The GNSs/ZnO/Al2O3 coating with 15 wt.% GNSs in the thickness of 1.82 mm presented the most prominent microwave absorption properties, which exhibited strong absorption (minimum reflection loss of −45 dB) and the reflection loss ≤ −10 dB bandwidth at the frequency range of 11.2-12.0 GHz. Meanwhile, the hardness of the coating increased from 914.2 HV0.2 to 1057.3 HV0.2 with the introduced 15 wt.% GNSs. These results suggest that GNS can be a promising nanofiller to simultaneously improve the microwave absorption properties and mechanical properties of absorbing coatings.
KW - complex permittivity
KW - graphene
KW - microwave absorption
KW - plasma spraying
UR - http://www.scopus.com/inward/record.url?scp=85108230139&partnerID=8YFLogxK
U2 - 10.1007/s11666-021-01223-w
DO - 10.1007/s11666-021-01223-w
M3 - Article
AN - SCOPUS:85108230139
SN - 1059-9630
VL - 30
SP - 1524
EP - 1534
JO - Journal of Thermal Spray Technology
JF - Journal of Thermal Spray Technology
IS - 6
ER -