PFPE 功能化微/纳铝粉在 CL-20 中的反应特性

In order to investigate the reaction characteristics of oxidizer-fuel composite materials with different particle sizes in constant-volume combustion,laser ignition and detonation environment of high energy explosive hexanitrohexaazaisowurtzitane (CL-20),three particle sizes of perfluoropolyether-functionalized micro/nano aluminum(nAl_150@xPFPE,μAl_1@xPFPE and μAl_5@xPFPE,where x=2.5%,5.0%,7.5%)was constructed by particle suspension method,and CL-20 based aluminized explosive was prepared by kneading granulation method. The pressure-time curve,laser-induced ignition process,energy release rate and efficiency of samples in CL-20 were studied by means of closed constant-volume explosive device,laser ignition,detonation velocity and detonation heat test equipment,respectively. The results showed that with the increase of PFPE mass fraction,the peak pressure and pressurization rate of nAl_150@xPFPE samples and μAl_1@xPFPE samples increased gradually, while the peak pressure of μAl_1@7.5%PFPE sample reached 4138.4 kPa and its pressurization rate reached 0.216 MPa·ms^-1. However,when the PFPE mass fraction exceeded 5.0%,the pressurization rate seemed to slow down. At the same time,with the increase of PFPE mass fraction,the burning rate of PFPE-functionalized micro/nano aluminum in CL-20 increased gradually. When x=7.5%,the burning rate of all the three samples with different particle sizes in CL-20 increased by 2.1 cm·s^-1,1.8 cm·s^-1 and 2.3 cm·s^-1,respectively. In addition,four kinds of fuel-rich CL-20 based aluminized explosives were designed. Among them,the measured detonation velocity of JWL-3 explosive(62% CL-20/32% μAl_1@5.0%PFPE/6% binder)was 8125 m·s^-1, the measured detonation heat was 8049.8 kJ·kg^-1,and the energy release efficiency reached 86.10%(measured by detonation heat).