Abstract
ZnO/Al2O3 composite coatings were prepared by plasma spray technology using ZnO powders, Al2O3 powders and PVA additives as starting materials. Phase compositions, microstructure of these coatings were analysised. And the influence of the content of ZnO in the absorbing coatings on dielectric property was investigated. The results indicate that new phase ZnAl2O4 generated in the progress of spraying, and by increasing the amount of ZnO, the counts of ZnAl2O4 increased. The density of coatings depends on the content of ZnO powders. The dielectric constant measurements revealed that when the content of ZnO increases from 60 mol% to 70 mol%, both the real part of permittivity and the loss change greatly over the frequency range 8.2-12.4 GHz. By the increase of frequency, the permittivity decrease when the ZnO content is 65 mol%, which demonstrated the strong frequency dispersion.
Original language | English |
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Pages (from-to) | 1800-1802 |
Number of pages | 3 |
Journal | Gongneng Cailiao/Journal of Functional Materials |
Volume | 41 |
Issue number | 10 |
State | Published - Oct 2010 |
Keywords
- Composite coatings
- Dielectric constant
- Plasma spraying
- ZnO/AlO