弱密封火工品的失效模式和贮存性能研究

Failure Modes and Storage Performance of Weakly Sealed Pyrotechnics

目的获取弱密封火工品在温度和温湿度环境下的失效模式和贮存性能。方法设计温度和温湿度2种环境下2种弱密封火工品的加速寿命试验,对加速贮存后的火工品进行外观检查、性能测试和失效模式分析。结果点火头这类防潮漆密封火工品的失效模式主要是作用时间变长,点火能力不足,其失效机理主要是脚线的氧化、药剂的潮解和药剂中还原剂的氧化。火焰雷管这类绸垫涂胶密封的火工品,在温湿度应力下的失效模式主要为输出能力下降,其失效机理主要是部羧铅遇水发生化学反应。结论弱密封火工品在温湿度环境下的贮存特性与自身密封性和装药特性有密切关系,其失效速率取决于自身的密封性和主装药剂的吸湿性和稳定性。

The work aims to obtain the failure modes and storage performance of weakly sealed pyrotech-nics under temperature and humidity environments.The accelerated life tests for two types of weakly sealed pyrotechnics under temperature and humidity environments were designed,and visual inspection,performance testing,and failure mode analysis were conducted on the pyrotechnics after accelerated storage.The main failure modes of damp proof paint sealed pyrotechnics such as ignition heads were prolonged action time and insufficient ignition ability.The main failure mechanisms were oxidation of pins,deliquescence of the agent,and oxidation of the reducing agent in the agent.The failure mode of silk pad and adhesive sealed pyrotech-nics such as flame detonators,under temperature and humidity stress mainly resulted in a decrease in output capacity.The failure mechanism was mainly due to the chemical reaction of carboxylic lead with water.The storage characteristics of weakly sealed pyrotechnics are closely related to their own sealing and charging characteristics under temperature and humidity environments.Their failure rate depends on their own sealing and the hygroscopicity and stability of the main charging agent.