一种无起爆药撞击火帽的输出特性

Output Characteristics of a Non-primary Explosive Percussion Primer

用50%50 nm Ti和50%5μm KClO4组成的非起爆药装药设计了一种无起爆药撞击火帽。采用模拟实验和高速摄影技术对该种无起爆药撞击火帽的输出特性进行了研究。实验结果显示,当Φ1.0 mm的击针撞击火帽时,其火帽中药剂的反应形式为缓慢燃烧;当Φ1.7 mm的击针撞击火帽时,火帽中药剂的反应形式为爆燃;当Φ3.0 mm的击针撞击火帽时,火帽中药剂的反应形式为爆炸。当以缓慢燃烧形式反应时,火帽输出的火焰强度很弱,炽热残渣为0,50%,特性点火距离为0。当以爆燃形式反应时,火帽输出的火焰持续时间约为250μs,炽热残渣为12.9 mg,50%特性点火距离为94 mm。当以爆炸形式反应时,火帽输出的火焰持续时间约为50μs,炽热残渣为7.7 mg,50%特性点火距离为52 mm。而同配方系列中的含叠氮化铅、50 nm Ti和5μm KClO4组成的起爆药装药撞击火帽,只有一种反应形式--爆炸,其火帽输出的火焰持续时间约为50μs,炽热残渣为6.5 mg,50%特性点火距离为32 mm。无起爆药撞击火帽以爆燃形式发火时,其点火性能优于其同配方系列中的含起爆药撞击火帽。

A kind of non-primary explosive percussion primers were made with the non-primary explosive charge composed of 50%(mass fraction)of 50 nm-sized Ti and 50%(mass fraction)of 5 μm-sized KClO4. The output characteristics of the non-primary explosive percussion primer were studied by means of simulation experiment and high-speed photography. The experimental results show that when a firing pin with diameter of 1.0 mm hits the primer,the reaction form of drug in the primer is slow combustion. When a firing pin with diameter of 1.7 mm hits the primer,the reaction form of drug in the primer is deflagration.When a firing pin with diameter of 3.0 mm hits the primer,the reaction form of drug in the primer is explosion. When reacting in the form of slow combustion,the output flame intensity of the primer is very weak,the hot ash is 0,and the 50% characteristic ignition distance is 0. When reacting in the form of deflagration,the flame duration of the primer output is about 250 μs,the hot ash is 12.9 mg,and the 50% characteristic ignition distance is 94 mm. When reacting in the form of explosion,the flame duration of the primer output is about 50 μs,the hot ash is 7.7 mg,and the 50% characteristic ignition distance is 52 mm,whereas for the primary explosive charge composed of lead azide,50 nm Ti and 5 μm KClO4 in the same formula series,there is only one type of reaction form-explosion,the flame duration of the primer output is about 50 μs,the hot ash is 6.5 mg,and the 50%characteristic ignition distance is 32 mm. When the percussion primers without primary explosive is ignited in the form of deflagration,its ignition performance is better than that of the percussion primers with primary explosive in the same formula series.