含CL-20的微孔发射药的设计及性能研究OA北大核心CSTPCD

In order to study the influence of hexanitrohexaazaisowurtzitane(CL-20)content and microporous struc-ture on the performance of gun propellant,a supercritical foaming process was used to design and prepare microporous gun propellants containing CL-20.Morphology and structure of the gun propellant were observed using scanning electron micros-copy(SEM).Combustion performance,mechanical properties,and sensitivity were studied by closed bomb tests,simply supported beam impact tests,and friction sensitivity tests,respectively.The results show that CL-20 particles uniformly disperse on the surface and interior of the sample,and a large number of bubbles with sizes ranging from 0.08 to 2.00 μm were formed inside the sample.The addition of CL-20 particles reduces mechanical properties of the samples.The higher the content of CL-20,the more significant the decrease in the impact strength and tensile strength of the sample.With the increase of CL-20 content,friction sensitivity and electrostatic sensitivity of the sample will also increase,and burning rate will be improved to a certain extent.Mechanical properties of the sample after foaming modification are weaker than those of the sample without foaming modification.Foaming process can suppress the increase in sensitivity caused by the increase in CL-20 content.After foaming,combustion performance of the sample is significantly improved.L-B(relative dynamic vivacity-relative pressure)curves of the sample show a rapid upward trend in the range of B from 0 to 0.10.And it reaches the maximum in the range of B from 0.14 to 0.18.When the mass fraction of CL-20 is 15%and 20%,Lmax is 14.39 MPa-1·s-1 and 9.70 MPa-1·s-1,respectively.