文档介绍：Propellants, Explosives, Pyrotechnics 27, 229 ± 240 (2002) 229
Characterization of Aluminum positions
Queenie S. M. Kwok, Robert C. Fouchard, Anne-Marie Turcotte, Phillip D. Lightfoot, Richard Bowes
and David E. G. Jones*
Canadian Explosives Research Laboratory, 555 Booth St., Ottawa, Ontario K1A 0G1 (Canada)
Summary shown to increase the detonation velocity and the detona-
tion pressure of some explosives(11,14).
The thermal behaviour of two different Al nanopowders and a Alex displays unusual behaviour in thermal tests(4, 15±25).It
micron-sized Al powder was studied using DSC, simultaneous was originally claimed that low-temperature exothermic
TG-DTA, and accelerating rate calorimetry (ARC). The results
show that the reactivity of Al powder increases as the particle size behaviour was related to some ™structural energy∫ due to
decreases. The thermal stability of the smaller Al nanopowder defects in the crystal lattice(4). However, a number of
(Als) in water and in a humid atmosphere was determined using subsequent studies have not found evidence for this internal
ARC and TG-DTA, respectively. Atomic Absorption Spectro- energy(5,15,17,26). Alex exhibits a strong exothermic peak in air
metry (AAS), X-Ray Photoelectron Spectrometry (XPS) and at temperatures that are 100 ± 2008C below the melting
Auger Electron Spectrometry (AES) were used to characterize
the surface chemistry of Alex. The outgassing behaviour for point of Al, due to the oxidation of the particles, a
mixtures of RDX and the various Al powders was investigated phenomenon only observed with nanoscale powders. It
using TG-DTA-FTIR-MS. Evolution of NO2 and N2O from a has been demonstrated that the particle size has an effect on
chemical interaction between Al nanopowders and RDX was the reactivity of the Al powders(18,27). Mixtures of nano-
observed. The effect of Als and Alex on the thermal stability of
TNT, RDX, Comp B, and AP was determined using ARC. metric Al and nitramines sho