Study on Hygroscopicity of Strontium Nitrate-5AT Ignition Powder
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摘要:为了研究吸湿性对硝酸锶-5AT点火药点火性能的影响，在低、中、高3种湿度环境下进行了硝酸锶-5AT点火药吸湿性试验，计算了不同湿度环境下吸湿率随时间的变化，并将吸湿前后的硝酸锶-5AT点火药装配至气体发生器中进行了输出性能试验。结果表明：硝酸锶-5AT的吸湿率随时间而增大，且环境湿度越高，吸湿率增速越快。与干硝酸锶-5AT相比，吸湿后硝酸锶-5AT在20，30，40 ms时的输出压力较低，p——t曲线一致性较差，压力起始时间出现了较明显的延迟，且随着硝酸锶-5AT水分含量增加，延迟时间变长。当硝酸锶-5AT水分含量为9.54%时，点火药产生的能量无法引燃产气药；当硝酸锶-5AT水分含量为22.52%时，初级点火药产生的能量无法点燃硝酸锶-5AT点火药。硝酸锶-5AT从开袋后到装配至气体发生器中的间隔时间不应超过0.5 h。
Abstract:In order to study the effect of hygroscopicity on the ignition performance of strontium nitrate-5AT ignition powder, the hygroscopic tests of strontium nitrate-5AT were carried out in low, medium and high humidity environment, and the the variation of hygroscopicity under different humidity environments was calculated. The strontium nitrate-5AT before and after moisture absorption was assembled into a gas generator for output performance test. The results show that the hygroscopicity of strontium nitrate-5AT increases with time, and the higher the environmental humidity, the faster the increase in the hygroscopicity. Compared with dry strontium nitrate-5AT, the strontium nitrate-5AT after moisture absorption has lower output pressure at 20 ms, 30 ms, and 40 ms, poor consistency in the p——t curve, and a significant delay in the start time of pressure. Moreover, as the moisture content of the strontium nitrate-5AT increases, the delay time becomes longer. When the moisture content of the strontium nitrate-5AT is 9.54%, the energy generated by the ignition powder cannot ignite the gas producing powder; When the moisture content of the strontium nitrate-5AT is 22.52%, the energy generated by the primary ignition powder cannot ignite the strontium nitrate-5AT ignition powder. The interval time between opening the bag and assembling strontium nitrate-5AT into the gas generator should not exceeds 0.5 hours.
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