Study on degradation of germanium coating on Kapton used for spacecraft sunshield application

Esther, ACM and Dey, Arjun and Sridhara, N and Yougandar, B and Bera, Parthasarathi and Anandan, C and Rangappa, D and Sharma, AK (2015) Study on degradation of germanium coating on Kapton used for spacecraft sunshield application. Surface and Interface Analysis , 47 (13). p. 1155.

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    Abstract

    Sunshield membranes made of germanium coated black polyimide (GBP) or Kapton are often used on the reflector/transmitter antenna of satellites for thermal control applications. However, the germanium top layer is prone to degrade during ground storage and implementation. Hence vacuum/inert gas sealed packaging is required for storing the membranes, followed by a staggered fabrication schedule as the shelf-life of the GBP is identified as only ~ 6 months. In the present study, microstructural, thermo-optical and electrical properties along with XPS studies for evaluating oxidation states of the as-received and degraded GBP films have been investigated thoroughly. The radio frequency (RF) loss behaviour of both the films has also been studied for S band (2.5 GHz- 3.5 GHz), Ku band (10.5 GHz- 14.5 GHz) and Ka Band (30 GHz- 35 GHz).

    Item Type: Journal Article
    Additional Information: Copyright for this article belongs to M/s. CHEMIE.DE Information Service Gm
    Uncontrolled Keywords: Germanium coated black Kapton;Thermal control;RF losses; Antenna sunshield;Degradation;XPS
    Subjects: CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
    Division/Department: Other, Other, Other, Other, Surface Engineering Division, Surface Engineering Division, Other, Other
    Depositing User: Ms. Alphones Mary
    Date Deposited: 05 May 2016 09:51
    Last Modified: 05 May 2016 09:51
    URI: http://nal-ir.nal.res.in/id/eprint/12467

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