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http://dx.doi.org/10.5139/JKSAS.2021.49.9.759

Establishment of Hygrothermal Aging Mechanism via Thermal Analysis and Extraction of Reaction Kinetics of Ti Metal-based Pyrotechnic Materials  

Oh, Juyoung (Department of Aerospace Engineering, Seoul National University)
Yoh, Jai-ick (Department of Aerospace Engineering, Seoul National University)
Publication Information
Journal of the Korean Society for Aeronautical & Space Sciences / v.49, no.9, 2021 , pp. 759-769 More about this Journal
Abstract
For aerospace propulsion systems, Titanium Hydride Potassium Perchlorate (THPP) is a material commonly used as a pyrotechnic initiator that generates gas when energy is supplied or as a supplement charge for NASA standard initiator (NSI). However, when the energetic materials are stored for a long time, it faces the problem of 'aging'. In this study, changes in thermodynamic properties of THPP aged under various humidity environments were identified through thermal analysis and surface analysis. First, a considerable amount of cracks on the surface of the oxidant was found in the aged THPPs. Particularly, when the humidity level increased, the number and length of the cracks rapidly increased. Also, the deterioration of Viton was found only in the thermally aged sample whereas the oxidation of the fuel was more pronounced in the hygrothermally aged samples. The extracted kinetic parameters of THPP on the reaction progress vary greatly by the humidity level, indicating that moisture significantly changes the performance and combustion reaction of THPP, which may eventually result in a reduced lifespan.
Keywords
Titanium Hydride Potassium Perchlorate(THPP); Pyrotechnics; Hygrothermal Aging; Aging Analysis; Thermal Analysis;
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