Evaluation of nanoalumina coated germanium black polyimide membrane as sunshield for application on the communication satellite antenna
| Autor: | Arjun Dey, Shaji V. Sebastian, Chinnasamy Anandan, N. Sridhara, Parthasarathi Bera, Anand Kumar Sharma, Dinesh Rangappa, A. Carmel Mary Esther |
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| Rok vydání: | 2016 |
| Předmět: |
010302 applied physics
Materials science Process Chemistry and Technology chemistry.chemical_element Germanium 02 engineering and technology Temperature cycling engineering.material 021001 nanoscience & nanotechnology 01 natural sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Kapton Chemical state Coating chemistry 0103 physical sciences Materials Chemistry Ceramics and Composites engineering Degradation (geology) Composite material Antenna (radio) 0210 nano-technology Polyimide |
| Zdroj: | Ceramics International. 42:2589-2598 |
| ISSN: | 0272-8842 |
| DOI: | 10.1016/j.ceramint.2015.10.062 |
| Popis: | Alumina thin coatings were grown on Germanium (Ge) coated black polyimide (GBP) or Kapton which has been used as a sunshield membrane on communication satellite antennas to protect it from environmental degradation during ground storage and implementation. The deposited nanoalumina coatings were found to be optically transparent in solar regime in spectral window while RF characteristic revealed negligible losses. Space worthiness of the coating was examined by simulated environments, e.g. humidity, thermal cycling and thermovacuum tests. No degradation was observed in its microstructural, thermo-optical, electrical, chemical state and RF characteristic in particular Ku and Ka bands. The aforesaid study indicates that the alumina thin coating is able to prevent surface degradation of GBP retaining the thermo-optical properties of the Ge coated Kapton and RF transparency which are functional requirements for communication antenna. The thickness of the optimized alumina coating was ~60 nm. |
| Databáze: | OpenAIRE |
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