Thermal decomposition of the high-performance oxidizer ammonium dinitramide under pressure
Thermal decomposition of the high-performance oxidizer ammonium dinitramide under pressure
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DOI：
10.1007/s10973-013-3626-x
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发表时间：
2014-01
影响因子：
4.4
通讯作者：
Hiroki Matsunaga;H. Habu;A. Miyake
中科院分区：
文献类型：
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作者：
Hiroki Matsunaga;H. Habu;A. Miyake
二硝酰胺铵（ADN）具有高氧平衡和高能量含量，且不含卤素原子，是一种很有前途的新型固体推进剂氧化剂。固体推进剂的一个必要特性是在各种条件下的化学稳定性。本文主要研究了ADN在加压条件下的热分解机理。将压力从0.1调节至6MPa，同时以恒定速率加热ADN。采用压力差示扫描量热法（PDSC）和拉曼光谱法同时测定了加热过程中凝聚相的膨胀行为和分解产物。PDSC分析显示了熔化后的多个阶段的结晶。低温下的膨胀行为随压力的变化而变化。分解产物的分析表明，硝酸铵（AN）在ADN的分解过程中产生的所有压力。在常压下，硝酸铵的生成与反应开始的时间相同。然而，在高压下，在凝聚相中的化学物种中的ADN的比例开始下降的温度高于在大气压力下，尽管存在显着的CO2。在初始阶段，不生成AN的ADN的热分解被认为是通过增加压力来促进的。
Ammonium dinitramide (ADN) is a promising new oxidizer for solid propellants because it possesses both high oxygen balance and high energy content, and does not contain halogen atoms. A necessary characteristic of solid propellants is chemical stability under various conditions. This study focused on the thermal decomposition mechanism of ADN under pressurized conditions. The pressure was adjusted from 0.1 to 6 MPa, while ADN was heated at a constant rate. The exothermal behavior and the decomposition products in the condensed phase during heating were measured simultaneously using pressure differential scanning calorimetry (PDSC) and Raman spectrometry. PDSC analyses showed the multiple stages of exotherms after melting. The exothermal behavior at low temperatures varied with pressure. Analysis of the decomposition products indicated that ammonium nitrate (AN) was generated during decomposition of ADN at all pressures. At normal pressure, AN was produced at the same time as start of exotherm. However, the temperature at which the ratio of ADN in chemical species in the condensed phase began to decrease under high pressure was higher than that at atmospheric pressure despite the existence of significant exotherm. At initial stage, thermal decomposition of ADN that does not generate AN was thought to be promoted by increased pressure.