Shape memory alloy film for deployment and control of membrane apertures

Lisa R. Hill; Greg Carman; Dong-Gun Lee; Brian Patrick

doi:10.1117/12.506311

30 January 2004 Shape memory alloy film for deployment and control of membrane apertures

Lisa R. Hill, Greg Carman, Dong-Gun Lee, Brian Patrick

Proceedings Volume 5166, UV/Optical/IR Space Telescopes: Innovative Technologies and Concepts; (2004) https://doi.org/10.1117/12.506311
Event: Optical Science and Technology, SPIE's 48th Annual Meeting, 2003, San Diego, California, United States

Abstract

Nickel Titanium (NiTi) film shape memory alloy (SMA) is integrated with space-qualified polymer and mesh materials for potential use as deployment mechanisms and actuation of flexible space apertures. SMA thin film is successfully applied to Astromesh metal mesh, Kapton, Upilex, and CP-1 polymer films. Sputter deposition of NiTi onto the substrate is used to validate the material system process and demonstrate the NiTi deployment capability. Although successful, the relatively high processing temperatures required to crystallize NiTi onto the substrates requires care. A second approach is demonstrated that deposits NiTi onto a silicon substrate, followed by coating the NiTi with the desired polymer, e.g. CP-1. Micro-electro-mechanical (MEMS) processing steps are then used to remove the silicon substrate beneath the NiTi, thus freeing up the composite membrane (i.e. NiTi + CP-1). Using MEMS fabrication techniques, a hot-shaped small dome shape structure is shaped into the NiTi before deposition of the CP-1 polymer. Activation of the integrated SMA/CP-1 produces deformation of this composite structure without damage. The test articles demonstrate the feasibility to both grossly deploy and locally actuate space-qualified polymer materials.

Citation Download Citation

Lisa R. Hill, Greg Carman, Dong-Gun Lee, and Brian Patrick "Shape memory alloy film for deployment and control of membrane apertures", Proc. SPIE 5166, UV/Optical/IR Space Telescopes: Innovative Technologies and Concepts, (30 January 2004); https://doi.org/10.1117/12.506311

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