Aging effects on Magnesium–Teflon–Viton related to magnesium hydroxide formation and the weakened bond of polytetrafluoroethylene

Magnesium (Mg) is one of the promising metal fuels used in various applications such as flares, propellants, and rocket motor igniters. In particular, Mg is often used in the form of compounds or mixtures rather than being used alone. However, Mg is vulnerable to moisture, requiring an extra care in...

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Bibliographic Details
Published in:Journal of thermal analysis and calorimetry 2024-03, Vol.149 (5), p.2189-2197
Main Authors: Lee, Yejun, Oh, Juyoung, Yoh, Jack J.
Format: Article
Language:English
Subjects:
Aging
Analytical Chemistry
Chemistry
Chemistry and Materials Science
High temperature environments
Inorganic Chemistry
Magnesium
Magnesium hydroxide
Magnesium oxide
Measurement Science and Instrumentation
Metal fuels
Mixtures
Moisture
Oxide coatings
Physical Chemistry
Polymer Sciences
Polytetrafluoroethylene
Relative humidity
Rocket engines
Superconductors (materials)
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Summary:Magnesium (Mg) is one of the promising metal fuels used in various applications such as flares, propellants, and rocket motor igniters. In particular, Mg is often used in the form of compounds or mixtures rather than being used alone. However, Mg is vulnerable to moisture, requiring an extra care in storage. Magnesium–Teflon–Viton (MTV), one of Mg-based mixtures, is expected to lose its combustion performance when exposed to moisture. The relative humidity (RH) conditions gave rise to the formation of an oxide film composed of magnesium oxide (MgO) and magnesium hydroxide (Mg(OH) 2 ), while Mg(OH) 2 was decomposed into MgO during the melting of polytetrafluoroethylene (Teflon). The dry conditions resulted in the formation of an oxide film composed only of MgO, which did not affect the melting of Teflon as in the RH condition. Moreover, a high-temperature environment intended for accelerated aging disrupted both pre-ignition and subsequent thermal reaction of MTV. Thus, the present work identified the changes in the thermochemical characteristics of MTV and clarified the roles of heat and moisture during such hygrothermal aging.
ISSN:1388-6150
1588-2926
DOI:10.1007/s10973-023-12794-x