Abstract
We fabricate and characterize bi-metallic structured thin films (~1 um thick) with ultra-low effective coefficient of thermal expansion (CTE). The films consist of a periodic array of aluminum (Al) hexagonal plates attached to a titanium (Ti) frame. In this designed discontinuous geometry, the self-standing films present ultra-low effective CTE through local release of the thermal strains by relative rotation of the lattice elements. We fabricated this structured film by a combination of conventional micro-fabrication process steps, and we measured its CTE as ultra-low (−0.6 × 10−6/°C) using 3D digital image correlation. This new thin film can lead to the creation of low-cost, adaptive structures that operate in extreme thermal environments, such as reflective layers for space telescopes.
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Acknowledgement
The authors acknowledge Dr. Risaku Toda, Dr. Victor White, and Dr. Harish Manohara from Jet Propulsion Laboratory, and Ms. Elisha Byrne from the Correlated Solutions, Inc. for helpful discussions and technical assistance. This work was supported by the Keck Institute for Space Studies, and Center Innovation Funds (CIF) from NASA’s Jet Propulsion Laboratory.
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© 2014 The Society for Experimental Mechanics, Inc.
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Yamamoto, N., Gdoutos, E., Daraio, C. (2014). Fabrication and Characterization of Bi-metallic, Structured Films with Ultra-low Thermal Expansion. In: Tandon, G., Tekalur, S., Ralph, C., Sottos, N., Blaiszik, B. (eds) Experimental Mechanics of Composite, Hybrid, and Multifunctional Materials, Volume 6. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, Cham. https://doi.org/10.1007/978-3-319-00873-8_11
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DOI: https://doi.org/10.1007/978-3-319-00873-8_11
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