Materials for Space-Formed, Rigidized Structures Used in Solar Thermal Propulsion Concepts

摘要

Large, inflatable, solar collector support structures that can be conveniently stowed, deployed, and efficiently rigidized are important components of solar thermal propulsion systems. Spacecraft powered by solar propulsion engines will be able to provide the velocity change required to economically maneuver large payloads from one orbit to another. This is an innovative concept, that when applied, will double the efficiency of currently used LH2/LO2 chemical engines. The Air Force Research Lab (AFRL) has funded Thiokol Propulsion to develop rigidized solar collector support structures. This paper will address the properties of materials used for the in situ construction of rigidized structures in space. Photo-polymerization, thermal curing using resistive heating and the use of thermoplastics will be discussed. Space processing of polymeric materials presents significant issues including outgassing, required cure energy, and the thermal extremes of the orbital environment. These issues will be addressed and the current status will be reviewed.