The kinetics of the thermal decomposition for a naturally ageing ammonium perchlorate(AP) and hydroxyl-terminated-polybutadiene(HTPB) base bleed composite propellant were investigated using a differential scanning cal...The kinetics of the thermal decomposition for a naturally ageing ammonium perchlorate(AP) and hydroxyl-terminated-polybutadiene(HTPB) base bleed composite propellant were investigated using a differential scanning calorimetry(DSC). The naturally ageing AP/HTPB base bleed propellant samples have been stored in a sealed plastic bag at room temperature(5-25 ℃) for more than 20 years. The experimental DSC results were obtained by placing samples(each about 1.5 mg) in a sealed pan under non-isothermal condition under different heating rates, 5.0, 10.0, 15.0, 20.0 and 30.0 ℃·min^(-1). The activation energy and pre-exponential factor were estimated based on the relationship between the exothermic peak temperature and the heating rate by Ozawa and Kissinger methods, respectively. The decomposition kinetic parameters is lower the values under laboratorial aging condition.展开更多
为研究底排装置内底排药剂点火燃烧特性并提高数值计算准确性，用差示扫描量热仪（DSC）和热导仪对比研究了某155 mm底排弹用未老化和经自然老化（在密封塑料袋内室温保存20余年）的高氯酸铵（AP）/端羟基聚丁二烯（HTPB）底排药剂的比...为研究底排装置内底排药剂点火燃烧特性并提高数值计算准确性，用差示扫描量热仪（DSC）和热导仪对比研究了某155 mm底排弹用未老化和经自然老化（在密封塑料袋内室温保存20余年）的高氯酸铵（AP）/端羟基聚丁二烯（HTPB）底排药剂的比热容和导热系数。结果表明，老化底排药剂20℃· min -1升温时 DSC 曲线的最大吸热峰温度和最大放热峰温度分别为253．52℃和437．54℃。基于 DSC 曲线和多项式拟合法得到了40～180℃温区间的比热容与温度的依变关系。老化底排药剂的比热容平均值和导热系数分别为0．9868 kJ· kg -1·℃-1和0．2292 W · m -1· K -1。未老化底排药剂的比热容平均值和导热系数分别为0．8887 kJ·kg -1·℃-1和0．4020 W·m -1·K -1。与未老化药剂相比，老化药剂的比热容增大约11％，而导热系数减小约43％。展开更多
文摘The kinetics of the thermal decomposition for a naturally ageing ammonium perchlorate(AP) and hydroxyl-terminated-polybutadiene(HTPB) base bleed composite propellant were investigated using a differential scanning calorimetry(DSC). The naturally ageing AP/HTPB base bleed propellant samples have been stored in a sealed plastic bag at room temperature(5-25 ℃) for more than 20 years. The experimental DSC results were obtained by placing samples(each about 1.5 mg) in a sealed pan under non-isothermal condition under different heating rates, 5.0, 10.0, 15.0, 20.0 and 30.0 ℃·min^(-1). The activation energy and pre-exponential factor were estimated based on the relationship between the exothermic peak temperature and the heating rate by Ozawa and Kissinger methods, respectively. The decomposition kinetic parameters is lower the values under laboratorial aging condition.
文摘为研究底排装置内底排药剂点火燃烧特性并提高数值计算准确性，用差示扫描量热仪（DSC）和热导仪对比研究了某155 mm底排弹用未老化和经自然老化（在密封塑料袋内室温保存20余年）的高氯酸铵（AP）/端羟基聚丁二烯（HTPB）底排药剂的比热容和导热系数。结果表明，老化底排药剂20℃· min -1升温时 DSC 曲线的最大吸热峰温度和最大放热峰温度分别为253．52℃和437．54℃。基于 DSC 曲线和多项式拟合法得到了40～180℃温区间的比热容与温度的依变关系。老化底排药剂的比热容平均值和导热系数分别为0．9868 kJ· kg -1·℃-1和0．2292 W · m -1· K -1。未老化底排药剂的比热容平均值和导热系数分别为0．8887 kJ·kg -1·℃-1和0．4020 W·m -1·K -1。与未老化药剂相比，老化药剂的比热容增大约11％，而导热系数减小约43％。
