To achieve aluminum particles with ultrafine granularity and high reactivity,the mechanical ball-milling method was adopted and three kinds of coatings,including stearic acid(SA),viton and dinitrotoluene(DNT),were add...To achieve aluminum particles with ultrafine granularity and high reactivity,the mechanical ball-milling method was adopted and three kinds of coatings,including stearic acid(SA),viton and dinitrotoluene(DNT),were added.The effects of milling time and different coatings on granularity and reactivity of ultrafine aluminum particles were studied.The structures of prepared ultrafine aluminum were characterized by scanning electron microscopy,X-ray particle diffraction and the thermal properties were analyzed by TG/DSC.Besides,the reactivity of prepared ultrafine aluminum particles was comprehensively analyzed and judged according to several thermodynamic parameters,the maximal oxidation rate,the oxidation degree of aluminum and the enthalpy change.The results revealed that aluminum particles prepared by the mechanical ball milling method were all flake-like and the particle sizes were below5 mm with nanometer-scale thickness.And the crystal form of aluminum was found to be unchanged.Besides,the ultrafine flake aluminum coated with stearic acid after milling for 5 h showed the highest reactivity with 56.1% of oxidation degree before 660℃,0.945 mg/℃ of maximal oxidation rate and 20491 J/g of enthalpy change.展开更多
介绍了一种含超细片状铝粉的温压燃料配方试样及各项物化性能参数测试过程,结合测试结果综合分析了该燃料的含能水平及铝粉在爆炸过程中的能量释放效率以及燃料爆炸火球发展规律和爆炸冲击波形成、扩展过程。结果表明:燃料的能量密度为1...介绍了一种含超细片状铝粉的温压燃料配方试样及各项物化性能参数测试过程,结合测试结果综合分析了该燃料的含能水平及铝粉在爆炸过程中的能量释放效率以及燃料爆炸火球发展规律和爆炸冲击波形成、扩展过程。结果表明:燃料的能量密度为16.11 M J.kg-1,理论爆炸威力大于4.0倍TNT当量,在爆炸抛散过程中片状铝粉的能量释放速率和有效利用率较高,对冲击波能量贡献较大;另外,燃料内相容性、贮存安定性和使用安全性良好,经过冲击试验和火炮的发射安全性考核,燃料抗过载能力大于1.7×105m.s-2,满足高过载武器平台发射安全性要求。展开更多
基金supported by the Natural Science Foundation of China (Project No51606102)the Fundamental Research Funds for the Central Universities (No. 30916011315)+3 种基金the Qing Lan Project, the Weapon Research Support Fund (No. 62201070827)a Project funded by the Priority Academic Program Development of Jiangsu Higher Education Institutionsthe Shanghai Aerospace Science and Technology Innovation Fund (SAST2015020)Basic Product Innovation Technology Research Project of Explosives
文摘To achieve aluminum particles with ultrafine granularity and high reactivity,the mechanical ball-milling method was adopted and three kinds of coatings,including stearic acid(SA),viton and dinitrotoluene(DNT),were added.The effects of milling time and different coatings on granularity and reactivity of ultrafine aluminum particles were studied.The structures of prepared ultrafine aluminum were characterized by scanning electron microscopy,X-ray particle diffraction and the thermal properties were analyzed by TG/DSC.Besides,the reactivity of prepared ultrafine aluminum particles was comprehensively analyzed and judged according to several thermodynamic parameters,the maximal oxidation rate,the oxidation degree of aluminum and the enthalpy change.The results revealed that aluminum particles prepared by the mechanical ball milling method were all flake-like and the particle sizes were below5 mm with nanometer-scale thickness.And the crystal form of aluminum was found to be unchanged.Besides,the ultrafine flake aluminum coated with stearic acid after milling for 5 h showed the highest reactivity with 56.1% of oxidation degree before 660℃,0.945 mg/℃ of maximal oxidation rate and 20491 J/g of enthalpy change.
文摘介绍了一种含超细片状铝粉的温压燃料配方试样及各项物化性能参数测试过程,结合测试结果综合分析了该燃料的含能水平及铝粉在爆炸过程中的能量释放效率以及燃料爆炸火球发展规律和爆炸冲击波形成、扩展过程。结果表明:燃料的能量密度为16.11 M J.kg-1,理论爆炸威力大于4.0倍TNT当量,在爆炸抛散过程中片状铝粉的能量释放速率和有效利用率较高,对冲击波能量贡献较大;另外,燃料内相容性、贮存安定性和使用安全性良好,经过冲击试验和火炮的发射安全性考核,燃料抗过载能力大于1.7×105m.s-2,满足高过载武器平台发射安全性要求。
