FOX-7对NC/TMETN基低敏感无烟改性双基推进剂燃烧性能的影响

Effect of FOX-7 on Combustion Performance of NC/TMETN Based Low-sensitive and Smokeless CMDB Propellant

采用燃速-靶线法研究了1,1-二氨基-2,2-二硝基乙烯(FOX-7)的含量、粒度及不同铅盐/铜盐/炭黑三元复合燃烧催化剂对硝化棉/三羟甲基乙烷三硝酸酯(NC/TMETN)低敏感无烟螺压改性双基推进剂燃烧性能的影响。结果表明,随着NC/TMETN基推进剂配方中FOX-7含量的增加,燃速先上升后下降,当FOX-7含量为25%时,可将基础配方10 MPa下的燃速由5.87 mm·s^-1提高至14.90 mm·s^-1,当FOX-7含量由25%增至30%时,10 MPa下的燃速由14.90 mm·s^-1降至12.78 mm·s^-1,FOX-7含量由5%增加至30%时,6~16 MPa下的压力指数由0.97降至0.60;用等量细颗粒的FOX-7取代粗颗粒时,可使推进剂10 MPa下的燃速降低1.16 mm·s^-1,使推进剂6~14 MPa各压力区间的压力指数增大;B-Pb/B-Cu/CB催化剂可以将NC/TMETN/FOX-7基改性双基推进剂10 MPa下燃速由未加催化剂时的14.90 mm·s^-1提高至18.65 mm·s^-1,6~16 MPa下的压力指数由未加催化剂时的0.63降至0.35。

The effects of mass fraction and particle size of 1,1-diamino-2,2-dinitroethylene(FOX-7),different composite combustion catalysts with lead,copper and carbon on the combustion performance of nitrocellulose(NC)/trimethylotethane reinitiate(TMETN)low-insensitive and smokeless composite modified double base(CMDB)propellant with screw extrusion process were investigated by means of strand burner method.The results shown that the burning rate of CMDB propellant is first rise and then descend with the addition of FOX-7.When the FOX-7 content is 25%,the burning rate of CMDB propellant rised from 5.87 mm·s^-1 to 14.90 mm·s^-1 at 10 MPa,and when the content of FOX-7 increases from 25%to 30%,the burning rate decreased from 14.90 mm·s^-1 to 12.78 mm·s^-1 at 10 MPa.The pressure exponent of burning rate between 6-16 MPa decrease from 0.97 to 0.60 as the mass fraction of FOX-7 in the formulation increased from 5%to 30%.When the FOX-7 be replaced by finer particles FOX-7 with the same mass,the burning rate decreased 1.16 mm·s^-1 at 10 MPa,while the pressure exponent of burning rate between 6-14 MPa increased.The burning rate of propellant with addition ofβ-Pb/β-Cu/CB combustion catalyst increases from 14.90 mm·s^-1 to 18.65 mm·s^-1 at 10 MPa,while the pressure exponent of burning rate between 6-16 MPa decrease from 0.63 to 0.35,which compared with the referenced formulation(no combustion catalyst).