成型工艺对2,4-二硝基苯甲醚基熔铸炸药装药质量的影响

Pressure casting and vacuum casting are used to improve the charge quality of DNAN-based melt-cast explosives, and the influences of casting precess on the temperature field, shrinkage porosity, relative density and tensile strength of DNAN-based melt-cast explosive are investigated. The results show that pressure casting can shorten the solidification time of DNAN-based melt-cast explosive and reduce its shrinkage cavity and porosity. When the molding pressure reaches 0.8 MPa, the relative density and tensile strength of DNAN/HMX explosives are increased by 6.4% and 9.9%, respectively, and no cracks are found in the grain. As for DNAN/RDX explosives, the relative density can be increased by 2.7%, and the tensile strength can be reduced by 40.8%, but the cracks exist in the grain. Although vacuum casting has no effect on the temperature field in solidification process, it can reduce the shrinkage cavity and porosity. When the vacuum degree reaches 0.08 MPa, the relative density and tensile strength of DNAN/RDX explosives are increased by 2.0% and 14.3%, respectively, and no cracks are found in the grain. Therefore, pressure casting and vacuum casting can be used respectively to improve the charge quality of DNAN/HM explosives and DNAN/RDX explosives.