期刊
SURFACE & COATINGS TECHNOLOGY
卷 210, 期 -, 页码 122-126出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2012.09.002
关键词
Plasma spraying; Microstructure; Dielectric properties; NiCrAlY/Al2O3 composite coatings
资金
- National Natural Science Foundation of China [51072165]
- fund of the State Key Laboratory of Solidification Processing in NWPU, China [KP200901]
NiCrAlY/Al2O3 composite coatings were prepared using the low power atmospheric plasma spraying technique. The metal fillers existing in the form of particles and lamellar are randomly distributed within the alumina matrix, which can be confirmed by scanning electronic microscopy. Dielectric measurement showed a significant enhancement of complex permittivity for NiCrAlY/Al2O3 composite coatings with the increase in NiCrAlY content over the frequency range 8.2-12.4 GHz. Both the real (epsilon') and imaginary (epsilon '') parts of the complex permittivity increase with increasing NiCrAlY content, which is ascribed to interfacial polarization and conductance loss, respectively. Furthermore, strong frequency dispersion was observed for the composite coatings with 36 wt.% NiCrAIY. Crown Copyright (C) 2012 Published by Elsevier B.V. All rights reserved.
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