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International Journal of Energetic Materials and Chemical Propulsion
ESCI SJR: 0.149 SNIP: 0.16 CiteScore™: 0.29

ISSN Imprimir: 2150-766X
ISSN On-line: 2150-7678

International Journal of Energetic Materials and Chemical Propulsion

DOI: 10.1615/IntJEnergeticMaterialsChemProp.v4.i1-6.290
pages 268-277

ATOMIC FORCE MICROSCOPY OF HOT SPOTS IN RDX AND AP CRYSTALS

J. Sharma
Naval Surface Warfare Center, Carderock Division, West Bethesda, MD 20817 USA
C. S. Coffey
Naval Surface Warfare Center, Indian Head Division, Indian Head, MD 20640 USA

RESUMO

An atomic force microscope has been used to reveal the structure of residual sub-micron size reaction sites in drop weight impacted RDX and in laser heated AP crystals. The smallest reaction sites in impacted RDX were hemispherical craters of 20−300 nm size. On a somewhat larger scale, hillocks of 200−1000 nm were observed, their shape giving evidence of internal reaction and ballooning. At some sites large (1000−3000 nm) volcano-like hot spots from which gases had escaped and where melting had taken place, were observed. Even a mild impact disrupts the periodicity of the RDX lattice, the molecules get displaced from their normal sites by as much as 20 % and sometimes get re-oriented. In AP, laser heating produced cracks and also trumpet shaped 50−200 nm craters, most of which supported a crystallographically oriented square lid on top of them, formed from the wellknown orthorhombic to cubic(rocksalt) phase transition at 240°C.


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