A study on degradation of germanium coating on Kapton used for spacecraft sunshield application

Surface and Interface Analysis - Tập 47 Số 13 - Trang 1155-1160 - 2015
A. Carmel Mary Esther1,2, Arjun Dey2, N. Sridhara2, B. Yougandar2, Parthasarathi Bera3, Chinnasamy Anandan3, Dinesh Rangappa1, Anand Sharma2
1Department of Nanotechnology, Center for Post Graduate Studies, Visvesvaraya Institute of Advance Technology, Visvesvaraya Technological University, Bengaluru Region, Muddenahalli, Chikkaballapur District, 562101 India
2ISRO Satellite Centre, Bangalore, 560017 India
3Surface Engineering Division, CSIR-National Aerospace Laboratories, Bangalore, 560017, India

Tóm tắt

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 X‐ray photoelectron spectroscopy (XPS) studies for evaluating oxidation states of the as‐received and degraded GBP films have been investigated thoroughly. The radio frequency (RF) loss behavior of both the films has also been studied for S band (2.5–3.5 GHz), Ku band (10.5–14.5 GHz), and Ka band (30–35 GHz). Copyright © 2015 John Wiley & Sons, Ltd.

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Surface and Interface Analysis

Tập 47 Số 13

1155-1160

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