@article{27995393000c4a3cbef1741a2f981006,
title = "Aluminum particle reactivity as a function of alumina shell structure: Amorphous versus crystalline",
abstract = "The objective of this study was to investigate Al particle reactivity as a function of the Al2O3 shell phase. Aluminum particles were thermally treated to transition the shell from amorphous to crystalline and each powder was combined with polytetrafluoroethylene (PTFE). Flame speeds were measured for Al + PTFE powder mixtures for two Al particle sizes that differ from micrometer (μAl) to nanometer (nAl) diameter and for both crystalline and amorphous Al2O3 shells encapsulating Al core particles. Results showed that μAl particles were more sensitive to shell phase than nAl particles. Reactions were modeled according to the melt dispersion mechanism (MDM), and altering the shell phase reduced the thickness, damaged the shell structure, impeded melt dispersion, and reduced flame speed for μAl particles by 45% and nAl particles by 12%.",
keywords = "Aluminum, Diffusion reactions, Flame speed, Fluorination reactions, Melt dispersion mechanism, Thermites",
author = "Walzel, {Renita K.} and Levitas, {Valery I.} and Pantoya, {Michelle L.}",
note = "Funding Information: Army Research Office award W911NF-17-1-0387; Office of Naval Research N00014-19-1-2082.The authors RW and MP are grateful for support from the Army Research Office under award W911NF-17-1-0387 and our Program Manager, Dr. Ralph Anthenien. The authors MP and VL are grateful for support from Office of Naval Research under award N00014-19-1-2082 and our program managers, Dr. Chad Stoltz and Mr. Matthew Beyard. All authors are thankful for assistance from Dr. Julius Warzywoda for TEM analysis and Dr. Bo Zhao for help with SEM images, both at Texas Tech University. Funding Information: The authors RW and MP are grateful for support from the Army Research Office under award W911NF-17-1-0387 and our Program Manager, Dr. Ralph Anthenien. The authors MP and VL are grateful for support from Office of Naval Research under award N00014-19-1-2082 and our program managers, Dr. Chad Stoltz and Mr. Matthew Beyard. All authors are thankful for assistance from Dr. Julius Warzywoda for TEM analysis and Dr. Bo Zhao for help with SEM images, both at Texas Tech University. Publisher Copyright: {\textcopyright} 2020 Elsevier B.V.",
year = "2020",
month = sep,
doi = "10.1016/j.powtec.2020.06.084",
language = "English",
volume = "374",
pages = "33--39",
journal = "Powder Technology",
issn = "0032-5910",
}