Melt dispersion mechanism for fast reaction of nanothermites
نویسندگان
چکیده
I'Ubi lc Reponing burden (ur Ihls collccti ... of lolorlll:ll ion j. I:$lInl:lloo to a\",rage I hour pI_ or mkr II5pI!Ir1 • ~ or In(urmalioo. locludbtg SIICIlC5l!on.~ for rc<.Iutin~ Ihl. lmrtlon. 10 WashI"!:'nn Hcadquonc~ St-tvic<5. Dlreaotarr ftlf ~ 0paaI -' Rr.>ons 121;; llIm5 I Sull. 1204. ArllllI:loo. VA 22202·4302. and to ,h. omce of M.nllllCnornt and a.q,'C1. Pa;rn\1lR RaNaim Pmka 1ITIDI-OIU.l W~ DC 2It5Gl I. AGENCY USE ONL Y ( LC3\'t! Blank) 12. REPORT DATE 3. REPORT n l'E AND 0.\ TES COVERED
منابع مشابه
Mechanochemical Mechanism for Fast Reaction of Metastable Intermolecular Composites Based on Dispersion of Liquid Metal
A new mechanism for fast reaction of Al nanoparticles covered by a thin oxide shell during fast heating is proposed and justified theoretically and experimentally. For nanoparticles, the melting of Al occurs before oxide fracture. The volume change due to melting induces pressures of 1–2 GPa and causes dynamic spallation of the shell. The unbalanced pressure between the Al core and the exposed ...
متن کاملDesign and Optimization of Novel Sugar Alcohol Based Extended Release Tablets Prepared by Melt Dispersion Technique
The aim of this study is to prepare novel sorbitol based extended release tablets by melt dispersion method using carbamazepine as a model drug. Carbamazepine was melted along with sugar alcohol to get melt dispersion granules (MGDs) and was characterized by differential scanning calorimetry (DSC), powder X-ray diffractometry (XRD) and solubility study. The physical and chemical parameters...
متن کاملMechanochemical mechanism for reaction of aluminium nano- and micrometre-scale particles.
A recently suggested melt-dispersion mechanism (MDM) for fast reaction of aluminium (Al) nano- and a few micrometre-scale particles during fast heating is reviewed. Volume expansion of 6% during Al melting produces pressure of several GPa in a core and tensile hoop stresses of 10 GPa in an oxide shell. Such stresses cause dynamic fracture and spallation of the shell. After spallation, an unload...
متن کاملبررسی سینتیکی و تعیین مکانیزم واکنش پودر هیدراید تیتانیم با مذاب آلومینیم خالص
In this research, the reaction kinetics of TiH2 powder in contact with pure aluminum melt at various temperatures on the basis of measuring the released hydrogen gas pressure was studied. To determine the mechanism the reaction, after Solidification of samples, interface of TiH2 powder in contact with melt was studied. The results showed that PH2-time curves had three regions. In the first and...
متن کاملThe Role of Metal Oxides in Nanothermite Reactions: Evidence of Condensed Phase Initiation
This work is a culmination of several corresponding studies designed to probe the initiation and reaction of aluminum nanothermite systems. The main diagnostic tool used in this study is a Temperature-Jump/Time-of-Flight Mass Spectrometer (T-Jump/TOFMS), which uses a filament heating method capable of very high heating rates up to 106 oC/s, while spectra are simultaneously obtained at a time re...
متن کامل