Pre-ignition laser ablation of nanocomposite energetic materials

Journal Article · Fri Jun 07 00:00:00 EDT 2013 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4808458· OSTI ID:22162987

Stacy, S. C.; Massad, R. A.; Pantoya, M. L. ^[1]

---

1. Department of Mechanical Engineering, Texas Tech University, Lubbock, Texas 79409 (United States)

Laser ignition of energetic material composites was studied for initiation with heating rates from 9.5 Multiplication-Sign 10{sup 4} to 1.7 Multiplication-Sign 10{sup 7} K/s. This is a unique heating rate regime for laser ignition studies because most studies employ either continuous wave CO{sub 2} lasers to provide thermal ignition or pulsed Nd:YAG lasers to provide shock ignition. In this study, aluminum (Al) and molybdenum trioxide (MoO{sub 3}) nanoparticle powders were pressed into consolidated pellets and ignited using a Nd:YAG laser (1064 nm wavelength) with varied pulse energy. Results show reduced ignition delay times corresponding to laser powers at the ablation threshold for the sample. Heating rate and absorption coefficient were determined from an axisymmetric heat transfer model. The model estimates absorption coefficients from 0.1 to 0.15 for consolidated pellets of Al + MoO{sub 3} at 1064 nm wavelength. Ablation resulted from fracturing caused by a rapid increase in thermal stress and slowed ignition of the pellet.

• OSTI ID: 22162987
• Journal Information: Journal of Applied Physics, Vol. 113, Issue 21; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
77 NANOSCIENCE AND NANOTECHNOLOGY
ABLATION
ABSORPTION
ALUMINIUM
AXIAL SYMMETRY
CARBON DIOXIDE LASERS
COMPOSITE MATERIALS
EXPLOSIVES
HEAT TRANSFER
HEAT TREATMENTS
HEATING RATE
MOLYBDENUM OXIDES
NANOSTRUCTURES
NEODYMIUM LASERS
POWDERS
PRESSES
PULSES
THERMAL STRESSES
WAVELENGTHS