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Thermal Aging Study of a Dow Corning SE 1700 Porous Structure Made by Direct Ink Writing [electronic resource] : 1-Year Results and Long-Term Predictions

Published:
Washington, D.C. : United States. Dept. of Energy, 2015.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
Physical Description:
19 pages : digital, PDF file
Additional Creators:
Lawrence Livermore National Laboratory, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary:
Dow Corning SE 1700 (reinforced polydimethylsiloxane) porous structures were made by direct ink writing (DIW). The specimens (~50% porosity) were subjected to various compressive strains (15, 30, 45%) and temperatures (room temperature, 35, 50, 70°C) in a nitrogen atmosphere (active purge) for 1 year. Compression set and load retention of the aged specimens were measured periodically during the study. Compression set increased with strain and temperature. After 1 year, specimens aged at room temperature, 35, and 50°C showed ~10% compression set (relative to the applied compressive deflection), while those aged at 70°C showed 20-40%. Due to the increasing compression set, load retention decreased with temperature, ranging from ~90% at room temperature to ~60-80% at 70°C. Long-term compression set and load retention at room temperature were predicted by applying time-temperature superposition (TTS). The predictions show compression set relative to the compressive deflection will be ~10-15% with ~70-90% load retention after 50 years at 15-45% strain, suggesting the material will continue to be mechanically functional. Comparison of the results to previously acquired data for cellular (M97*, M9760, M9763) and RTV (S5370) silicone foams suggests that the SE 1700 DIW porous specimens are on par with, or outperform, the legacy foams.
Report Numbers:
E 1.99:llnl--tr-679297
llnl--tr-679297
Subject(s):
Note:
Published through SciTech Connect.
11/13/2015.
"llnl--tr-679297"
Ward Small; Mark A. Pearson; Amitesh Maiti; Thomas R. Metz; Eric B. Duoss; Thomas S. Wilson.
Funding Information:
AC52-07NA27344
View MARC record | catkey: 24056522