BTATz-Pb复合物对双基和RDX-改性双基推进剂的热行为、非等温动力学及燃烧性能的影响

doi:10.3866/PKU.WHXB201308301

Abstract

Abstract:

The composite double base (DB)/hexogen (RDX)-modified double base (CMDB) propellants (Nos. DB001 and CMDB100) were prepared with the lead complex of 3,6-bis(1H-1,2,3,4-tetrazol-5-ylamino)-1,2,4,5-tetrazine (LCBTATz), with and without the ballistic modifier. Their thermal behaviors and nonisothermal decomposition reaction kinetics were investigated by thermogravimetry, derivative thermogravimetry (TG-DTG), and differential scanning calorimetry (DSC). For the LCBTATz-DB propellant, there was one mass loss stage in the TG curve and one exothermic peak in the DSC curve over the temperature range 350-540 K. For LCBTATz-CMDB, there were two continuous exothermic stages in the TG curve, and only one corresponding exothermic peak in the DSC curve over the range 390-540 K. The exothermal decomposition reaction mechanisms of LCBTATz-DB and LCBTATz-CMDB follow the functions f(α)=α^-1/2 and f(α)=2(1-α)^3/2, respectively (α: conversion degree). The self-accelerating decomposition temperatures (T_SADT), thermal ignition temperatures (T_TITT), critical temperatures of thermal explosion (T_b), adiabatic timesto-explosion (t_Tlad), and thermodynamic parameters of activation reaction were calculated, and the thermal safety was evaluated. For DB001, T_SADT=444.50 K, T_TITT=453.96 K, T_b=471.84 K; t_Tlad=39.36 s. For CMDB100, T_SADT=442.38 K, T_TITT=452.89 K,T_b=464.13 K,t_Tlad=21.3 s. As a high-efficiency combustion catalyst, LCBTATz in double-base propellants increases the propulsion rate and reduces the pressure index for larger scale pressures. This makes the DB propellant appear to have a significant super burning effect at 2-8 MPa and a "mesa effect" at 8-12 MPa. Meanwhile, the pressure exponent of the CMDB propellant decreased to 0.18.

Key words: 3,6-Bis(1H-1,2,3,4-tetrazol-5-yl-amino)-1,2,4,5-tetrazine, Lead salt, Double-bas propellant, Composite modified double base propellant, Nonisothermal kinetics, Thermal safety, Combustion property

MSC2000:

O643

LI Wen, REN Ying-Hui, ZHAO Feng-Qi, ZHANG Xian-Bo, MA Hai-Xia, XU Kang-Zhen, WANG Bo-Zhou, SONG Ji-Rong, HU Rong-Zu. Effects of Lead Complex-Based BTATz on Thermal Behaviors, Non-Isothermal Reaction Kinetics and Combustion Properties of DB/RDX-CMDB Propellants[J].Acta Phys. -Chim. Sin., 2013, 29(10): 2087-2094.

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Effects of Lead Complex-Based BTATz on Thermal Behaviors, Non-Isothermal Reaction Kinetics and Combustion Properties of DB/RDX-CMDB Propellants

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