Thermal Control Coatings on Mg-Li Alloys

Document Number: 932123

Date Published: July 1993

Author(s):
A. K. Sharma - ISRO Satellite Center
H. Bhojaraj - ISRO Satellite Center
V. K. Kaila - ISRO Satellite Center
H. Narayanamurthy - ISRO Satellite Center

Abstract:
Integral black anodizing and gold plating on Mg-Li alloys were developed for spacecraft thermal control applications. The influence of various process conditions have been investigated to optimize the process. The deposits were characterized by morphological studies, adhesion test, thickness measurement, microhardness evaluation and porosity inspection. The space worthiness of the thermal cycling, and thermovacuum tests and measurement of optical properties. The high solar absorptance and infrared emittance (\ga\ds = 0.95, \gs\dt = 0.93) value of black anodic film showed that these can be effectively utilized to improve heat radiation characteristics. The gold coating on the other hand provides the infrared emittance as low as 0.03, is extremely suitable in minimizing the radiative coupling with other components within the spacecraft. Such gold metallised surfaces with extremely low infrared emittance values are useful as radiation shields for achieving temperatures as low as 80\gDK in space application such as very high resolution radiometers.

File Size: 624K
Product Status: In Stock

See other papers presented at International Conference On Environmental Systems, July 1993, Colorado Springs, CO, USA, Session: International Conference On Environmental Systems

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