CL-20 based energetic thin films: Micro-spray molding and micro-detonation

摘要

In order to solve the problem of low sample forming efficiency and uncontrollable crystal type in inkjet printing, a formula of explosive ink suitable for micro-spraying is designed by using hexanitrohexaazaisowurtzitane (CL-20) as the main explosive, the compound of polyazide glycidyl ether and ethyl cellulose as the bonding system, ethyl acetate as the solvent, and the refined ε-CL-20 as the seed crystal in this paper. The optimal process conditions were determined, and under the optimal process conditions, the explosive ink is written on an aluminum substrate or a glass substrate by micro-spraying direct writing technology, and CL-20 based energetic thin film forming samples are characterized. The results show that the CL-20 crystal form in the sample is ε type and the molding effect is good. The optimum process conditions are as follows: the nozzle has an air pressure of 0.02 MPa, the height is 40?mm, the spraying rate is 0.4 ml min ?1 , and the substrate temperature is 50°C. The explosive particles in the energetic thin films are spherical. The particle size is about 10 μ m, and the particle size distribution is relatively uniform. The density of the composite is 1.567?g?cm ?3 , and the molding density can reach 80.2% of the theoretical density. The activation energy is 242.07 kJ mol ?1 . The characteristic drop height H 50 is 38.5?cm. When the charge width is 0.8?mm, the critical size of the detonation is 0.8 × 0.03?mm 2 . The detonation wave formed after the shaped sample is detonated in a small groove with a cross-sectional dimension of 1.0 × 1.0?mm 2 can successfully pass through multiple continuous 90° charging corners.