Ultrafast impact dynamics of reactive materials (Dlott)
Abstract
This project was a 3-year study of the fundamental science underlying impact initiation and ignition of nanotechnology reactive materials (RM). In a conventional shock initiation experiment, the duration of the emission bursts is controlled by the size of the charge. We operated in a limit where the charge was so thin that the emission duration was controlled by fundamental mechanisms. A novel laser-driven flyer plate apparatus was developed to launch metal foils at RM up to 4.5 km/s. A study to test the apparatus studied time-resolved emission from a dye embedded in an impacted sample. A detailed study was made using an RM consisting of nano-Al + Teflon which can generate more than three times the energy of TNT. With 50 micron flyers producing approx. 10 ns shocks, the RM was initiated above 1 km/s. During the shock, the emission looked just like Teflon alone. Afterward giant emission bursts lasting a few tens of ns were generated due to Al + Teflon chemistry. These observations indicated the mechanism involved initial shock decomposition of Teflon into carbon plus fluorine. After the shock unloaded, fluorine penetrated the oxide passivation layers of the Al nanoparticles, initiating violent reactions.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 16, 2013
- Accession Number
- ADA579434
Entities
People
- Dana D. Dlott
Organizations
- University of Illinois Urbana–Champaign