【作者】 闫冠云； 田强； 刘家辉； 陈波； 黄朝强； 孙光爱； 黄明； 周小清； 聂福德； 田丰；

【Author】 YAN Guan-yun;TIAN Qiang;LIU Jia-hui;CHEN Bo;HUANG Chao-qiang;SUN Guang-ai;HUANG Ming;ZHOU Xiao-qing;NIE Fu-de;TIAN Feng;Key Laboratory of Neutron Physics, Institute of Nuclear Physics and Chemistry,CAEP;Institute of Chemical Materials,CAEP;Institute of Shanghai Apply Physics, Chinese Academy of Sciences;

【机构】 中国工程物理研究院中子物理学重点实验室,核物理与化学研究所； 中国工程物理研究院化工材料研究所； 中科院上海应用物理研究所上海光源国家科学中心；

【摘要】 奥克托金制备的粘结剂型炸药(HMX-PBX)在温度刺激下会发生热膨胀、相变、热分解等反应,造成微孔洞及裂纹增多,进而影响材料的稳定性和爆轰性能。本文利用X射线小角散射(SAXS)对热损伤HMX-PBX的微孔洞变化进行了研究,分析了制备压力及HMX颗粒尺寸对加热过程中PBX微孔洞的影响。HMX颗粒在180℃产生了大量微孔洞,随加温时间增加,其尺寸增大、数量减少;压力加载造成HMX内部孔洞、裂纹等微缺陷增多,在温度刺激下,其内部微孔含量明显多于未加载样品,随着加温时间增加,其孔洞平均尺寸增加更快;HMX颗粒尺寸会影响β-δ相变速率,进而导致大颗粒的PBX样品内部微孔洞含量在180℃1h即达到最大,而小颗粒的PBX样品需要在180℃3h才达到最大。更多还原

【Abstract】 The micro-defects in thermally damaged HMX-PBX will increase because of thermally swell, β-δ phase change and chemical decomposition, which will affect the property of HMX-PBX like sensitivity, safety and performance. In order to learn the effect of the compression stress and the particle sizes on the microstructure transition of thermal damaged HMX-PBX, HMX particles and HMX-PBX were thermal treated and measured by small-angle X-ray scattering(SAXS). A large amount of pores of about 10 nm were found when temperature is 180℃, which became lager and fewer in number with increasing temperature and longer soak time. The pressed HMX samples(LP) have more pores than raw HMX(LH) sample, when heated by 180℃, the average pore diameter of LP grown faster than LH. For HMX-PBX samples, the average pore radii of FHP and LHP decreased from approximately 45 nm to 25 nm at 180℃, and the total pore volume increased distinctively because of phase transformation. The LHP sample reached a high level of pore content after being held at 180℃ for 1 h, whereas FHP required 3 h.更多还原