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Abstract In this paper, an integrated component of the three-electrode planar switch and the exploding foil bridge was fabricated on the ceramic substrate by the magnetron sputtering process and wet etching process, which was beneficial to the miniaturization, low energy and integration of the explosion foil initiator system. We discussed the self-breakdown voltage of the three-electrode planar switch under different structural parameters and established the formula of self-breakdown voltage. By testing the discharge performance of the integrated component under a charging voltage of 1300 V~1500 V, we obtained a delay time of about 300 ns for the component, which is lower than the delay time when the spark gap switch is used. This result showed that the inductance of the entire circuit was lower than the inductance of the conventional circuit. We conducted a preliminary study on whether the integrated components are affected by changing of the working environment. Finally, based on this integrated component, we have used LTCC technology to produce a new highly integrated EFI system. Highlights • The integrated component we designed is suitable for exploding foil initiator system. • We discussed the SBV of the planar switch under different structural parameters and established the formula of SBV. • We have prepared a new highly integrated EFI system using LTCC technology based on the integrated components designed. [ABSTRACT FROM AUTHOR]

[Display omitted] • An energetic Al/Ni reactive multilayer foil is prepared by magnetron sputtering and wet etch method. • Intermetallic reaction of Al/Ni is beneficial for improving energy efficiency and plasma density. • Energy efficiency of the Al/Ni exploding foil is measured to be 30.9% higher than that of Cu exploding foil. • A direct ignition method is proposed by utilizing the abundant plasma generated at Al/Ni exploding foil, instead of driving a slapper. In order to lower the firing voltage, an energetic Al/Ni exploding foil (Al/Ni-EF) with enhanced energy efficiency and plasma density was prepared in this study, to realize the direct ignition of pyrotechnics. An Al/Ni reactive multilayer foil (Al/Ni-RMF) was firstly synthesized by magnetron sputtering and wet etch method, and its structure and exothermic behavior were investigated. Scanning Electron Microscopy, Atomic Force Microscope and X-ray Diffraction characterizations confirmed the periodic layer structure of Al/Ni-RMF with a total thickness of 4 μm. The highest heat release in Al/Ni-RMF could be achieved theoretically when the ratio of Al and Ni was 1.5, and thus the thickness of single Al and Ni layer was determined to be 300 nm and 200 nm, respectively. The obtained Al/Ni-RMF was subsequently fabricated to be an exploding foil, and its electric explosion performance was further studied. Energy efficiency of the Al/Ni-EF was measured to be 85.9% during the electric explosion process, which was 30.9% higher than that of Cu exploding foil (Cu-EF). The plasma generated at Al/Ni-EF had larger volume, longer duration time and higher temperature than Cu-EF due to the intermetallic reaction between Al and Ni, which was beneficial for the direct ignition of Boron/Potassium Nitrate composition (B/KNO 3 , BPN). Afterwards, a special Al/Ni-EF ignitor without slapper was constructed, and the fierce ignition of BPN at the minimum discharge voltage of 800 V was observed. Above results confirmed the feasibility of direct ignition, such a unique strategy was beneficial for the development of low-energy, low-cost and miniaturized ignitor. [ABSTRACT FROM AUTHOR]

Highlights • A new method of porous copper azide precursor construction is proposed. • The designed ink has sufficient surface area to ensure the azide reaction. • The binder doesn't hinder formation of pores but maintains a 3D porous structure. • The 3D porous structure maintains certain strength and adhesion after drying. • Performance of copper azide can be adjusted by tuning the ink parameters. Abstract The aim of the present work is to design a copper azide precursor direct writing ink for primary explosive-on-a-chip. The mixture of water/vinyl alcohol and isopropanol/ethyl cellulose was used as binder. Cetyltrimethylammonium bromide (CTAB) used as foaming agent and dodecanol as foam stabilizer were added into the binder to produce plenty of bubbles. 40 wt% of nano-copper powder was added into the binder and the three-dimensional porous precursor ink was obtained. After 24 h of in-situ gas–solid azide reaction, the copper precursor ink was completely transformed into copper azide. An explosive device was designed to verify the detonation performance of the copper azide by direct writing, and the result showed that it can reliably initiate the CL-20 into complete detonation. [ABSTRACT FROM AUTHOR]

In this study, we reported that two-dimensional titanium carbide (Ti 3 C 2) MXene has intrinsic catalytic activity for thermal decomposition of high-energy ammonium perchlorate-based molecule perovskite (H 2 dabco)[NH 4 (ClO 4) 3 ] (DAP-4). The micro morphology and structure of Ti 3 C 2 MXene were characterized. Thermal catalysis decomposition of DAP-4 using Ti 3 C 2 as a novel catalyst was investigated by Differential scanning calorimetry (DSC). The results showed that with 10 wt% Ti 3 C 2 added, the decomposition temperature of DAP-4 was reduced to 341.2 °C at the heating rate of 10 °C·min−1, which decreased by 43.8 °C from raw DAP-4 (385 °C). The activation energy of DAP-4 thermal decomposition effectively reduced from 181 kJ mol−1 to 155 kJ mol−1. A possible mechanism of Ti 3 C 2 MXene for the catalysis thermal decomposition of DAP-4 was proposed. This work provides a proof-of-principle concept for the thermal catalysis decomposition of ammonium perchlorate-based molecule perovskite energetic materials using the titanium carbide MXene as a catalyst. • Ti 3 C 2 MXene has intrinsic catalytic activity for thermal decomposition of DAP-4. • The decomposition temperature and activation energy of DAP-4 has reduced to 341.2 °C and 155 kJ mol−1. • A possible mechanism of Ti 3 C 2 MXene for the catalysis thermal decomposition of DAP-4 was proposed. [ABSTRACT FROM AUTHOR]