Microwave-Switchable Microstructure in Energetic Materials Using Microwave Absorptive Inclusions

Lawrence, Adam R.

doi:10.2514/6.2022-0573

AIAA SCITECH 2022 Forum 2022

DOI: 10.2514/6.2022-0573

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Microwave-Switchable Microstructure in Energetic Materials Using Microwave Absorptive Inclusions

Adam R. Lawrence

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2023

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“…Microwave coupling gas generating thermites have also been demonstrated. When a microwave field is applied, microwave energy is deposited to the dopant that is mixed with a thermite, which causes the composition to microwave-heat to ignition temperature [15]. Others have also been working on ways to couple microwaves directly with energetics such as energetic inks [16] created from printed nAl and MnO x and subsequently triggering ignition with microwave energy.…”

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confidence: 99%

High‐Speed, microwave ignition: Antenna igniters with frequency and bandwidth selectivity

Lajoie

Barkley²,

Sippel

2023

Propellants Explo Pyrotec

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This effort demonstrates the development of (1) dielectric breakdown igniters and (2) bridgewire igniters powered by half‐wavelength dipole microwave microstrip antennas with bandwidth selectivity for use in standoff ignition applications. Dielectric igniters utilized a dielectric epoxy filled with up to 30 wt. % nanothermite cast between the gap of two quarter wavelength microstrips. Bridgewire igniters employed a wire soldered across the gap of two quarter wavelength microstrips. A variety of different bridgewire materials were tested in diameters ranging from 76 μm to 203 μm. The ignition delay of resonant microwave igniters is measured from high‐speed video observation of the microwave illumination process within a free‐space anechoic microwave cavity driven by a 2 kW continuous magnetron source. Dielectric breakdown igniters produced ignition delays ranging from 400 ms to 850 ms. Ignition delay decreased with higher loading of thermite. Bridgewires were found to be highly efficient and measured ignition delays ranged from 17 ms to 271 ms (24.4 J to 457.1 J ignition energy). Smaller diameter bridgewires and high resistivity metals were found to produce the shortest ignition delays. We demonstrate through S‐parameter measurements the bandwidth selectivity of bridgewire igniters and show that control of dipole geometry enables tuning of igniter center frequency and bandwidth and demonstrate experimentally the ability of bridgewire igniters to reject accidental ignition from an off frequency high power microwave field. The tunability, bandwidth selectivity, and low energy requirements, in particular of bridgewires, make them attractive for a number of new and challenging ignition applications.

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confidence: 99%

High‐Speed, microwave ignition: Antenna igniters with frequency and bandwidth selectivity

Lajoie

Barkley²,

Sippel

2023

Propellants Explo Pyrotec

View full text Add to dashboard Cite

show abstract

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Microwave-Switchable Microstructure in Energetic Materials Using Microwave Absorptive Inclusions

Cited by 1 publication

References 16 publications

High‐Speed, microwave ignition: Antenna igniters with frequency and bandwidth selectivity

High‐Speed, microwave ignition: Antenna igniters with frequency and bandwidth selectivity

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