Increased exothermic reactivity of polytetrafluoroethylene-coated aluminum powders: Impact of powder size reduction

•The PTFE coated Al (PTFE/Al) powders without surface oxide were synthesized with different sizes.•Synergistically increased exothermic energy (ΔH) was achieved from the smallest PTFE/Al powders.•Simultaneous control of PTFE coating and powder size opens novel route to tailor energetic properties. P...

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Bibliographic Details
Published inMaterials letters Vol. 351; p. 135009
Main Authors Jung, Soo-ho, Kim, Kyung Tae, Bae, Jinhee, Choi, Yoon Jeong, Kim, Jae Min, Sun, Jeong-Yun
Format Journal Article
LanguageEnglish
Published Elsevier B.V 15.11.2023
Subjects
Aluminum powder
Energetic materials
PTFE coating
Thermal oxidation behavior
Aluminum powder
Thermal oxidation behavior
PTFE coating
Energetic materials
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Summary:•The PTFE coated Al (PTFE/Al) powders without surface oxide were synthesized with different sizes.•Synergistically increased exothermic energy (ΔH) was achieved from the smallest PTFE/Al powders.•Simultaneous control of PTFE coating and powder size opens novel route to tailor energetic properties. Polytetrafluoroethylene (PTFE)-coated aluminum (PTFE/Al) powder was synthesized to evaluate its exothermic reactivity with the reduction in Al powder size. The exothermic enthalpy energies of uncoated Al powders clearly increase as the particle size decreases from 30 to 5 μm. Thus, the PTFE/Al (5 μm) powder exhibited the highest exothermic enthalpy energy of 4300 J/g, which is approximately two times higher than that of uncoated Al (5 μm) and PTFE/Al (30 μm) powders. The findings clarify that the combination of powder size reduction and PTFE coating results in both a considerable enhancement of exothermic reactivity and tailorable enthalpy energy values.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2023.135009