Mg(BH_4)_2和MgH_2对RDX热分解特性的影响  

Effect of Mg(BH_4)_2 and MgH_2 on Thermal Decomposition Performance of RDX

作　　者：姚淼[1] 陈利平[1] 堵平[1] 彭金华[1] 

机构地区：[1]南京理工大学化工学院,江苏南京210094

出　　处：《中国安全科学学报》2013年第1期115-120,共6页China Safety Science Journal

摘　　要：在黑索今(RDX)中加入具有高热值的金属氢化物(Mg(BH4)2和MgH2)有望提高RDX的爆炸性能,但同时给RDX的安全使用带来挑战。为了探索RDX与这2种金属氢化物的相容性与安定性,采用差示扫描量热法(DSC)研究Mg(BH4)2和MgH2对RDX热分解性能的影响,并由DSC得到的数据计算动力学参数,参照GJB770B—2005的方法分析这2种金属氢化物与RDX的相容性和安定性。结果表明,加入Mg(BH4)2使RDX的表观活化能从159.22 kJ/mol增加至180.27 kJ/mol,加入MgH2使RDX的表观活化能降低至133.69 kJ/mol;Mg(BH4)2与RDX的相容性为1级,MgH2与RDX的相容性为3级,加入Mg(BH4)2使RDX的安定性有所提高,加入MgH2降低了RDX的安定性。因此,在将MgH2作为RDX的高能添加剂以前,必须首先提高其与RDX的相容性以保证试验和存储过程的安全。Metal hydrides（Mg（BH4）2 and MgH2） with high heat values are expected to improve the explosion properties of RDX. However, they bring safety problems at the same time. In order to explore the consistencies between RDX and these two kinds of metal hydrides, the DSC was used to study the ther- mal decomposition characteristics of RDX influenced by the addition of Mg （ BH4 ） 2 and MgH2. The consis- tencies between RDX and two kinds of metal hydrides were calculated and compared though the standard GJB770B -2005 respectively. In addition, the stabilities of the mixtures were obtained, too. The results show that the addition of Mg （BH4 ）2 increases the apparent activation energy from 159.22 kJ/mol to 182.27 kJ/mol and the addition of MgH2 decreases the apparent activation energy of RDX to 133.69 kJ/mol. The consistency grade of Mg（BH4） 2/RDX is 1 and the consistency grade of MgH2/RDX is 3 besides, the addition of Mg（ BH4） 2 is benefit to the stability of RDX and the addition of MgH2 lower the stability of RDX. So, how to enhance the consistency between RDX and MgH2 is the principal problem when adding MgH2 to RDX.

关 键 词：黑索今(RDX) Mg(BH4)2 MgH2 差示扫描量热法(DSC) 热分解 相容性 安定性 

分 类 号：X937[环境科学与工程—安全科学]