含叠氮增塑剂AZDEGDN发射药的制备和燃烧性能OA北大核心CSTPCD

In order to explore the application prospect of a novel azido plasticizer 1,5-diazide-3-oxapentane(AZDEGDN)in gun propellant formulation,a semi-solvent method was adopted to prepare double-and triple-base gun propellants using AZDEGDN as the plasticizer,and the morphology,density as well as static combustion performance at different temperatures of AZDEGDN-containing propellants were studied.Results show that the AZDEGDN-containing double-base propellant(ADG-2)and triple-base propellant(ADG-3)without obvious defects in appearance can be prepared by semi-solvent extrusion process.SEM test shows that solid additives hexogen(RDX)and nitroguanidine(NGu)are uniformly distributed within ADG-3 propel-lant.The density of ADG-2 is 1.44 g·cm-3 and ADG-3 is 1.52 g·cm-3,both close to their theoretical density,indicating that the internal structures of AZDEGDN-containing propellants are relatively dense.The closed vessel tests demonstrate that the static combustion performances of both ADG-2 and ADG-3 propellants at room temperature(20 ℃)are stable.The burning rates in-crease evenly with the increase of pressure,without obvious turning phenomenon in burning rate-pressure curves(u-p curves).The maximum combustion pressure of ADG-2 and ADG-3 propellants is 237.71 MPa and 263.80 MPa,and the burning rate pressure index is 0.9098 and 0.9754,respectively.The addition of RDX and NGu results in an increase of 15.5％and 10.9％in the burning rate pressure index of AZDEGDN-containing propellants in the low pressure range(50-1 00 MPa)and medium pres-sure range(100-150 MPa)respectively,while the burning rate pressure index in the high pressure range(1 50-pdpm MPa)de-creases by 4.2％.At high temperature(50 ℃)and low temperature(-40 ℃),ADG-3 propellant can still keep stable combus-tion.The maximum combustion pressure changes from 263.80 MPa at room temperature to 265.92 MPa and 261.13 MPa,re-spectively.Besides,the combustion time changes from 14.70 ms to 13.52 ms and 16.40 ms respectively,and the burning rate pressure index changes from 0.9754 to 0.9464 and 0.9938 respectively.It is concluded that AZDEGDN-containing gun propel-lant is simple and mature in preparation method,dense and defect-free in structure,and also stable in static combustion perfor-mance,which is expected to become a kind of novel low-ablation gun propellant.