学术数据库优秀期刊 《中文科技期刊数据库》来源期刊

To address the insulation anomaly of SCB pyrotechnics during electrostatic discharge (ESD) screening, scanning electron microscopy and energy spectrum analysis confirmed that the foreign matter was metallic filiform burrs remaining from electrode plug shell machining. Twenty-five simulated components were fabricated and subjected to ESD (500 pF/25 kV/5 000 Ω), mechanical vibration, and combined “vibration?then?ESD” stress tests. The results show that the Lorentz force generated by ESD can drive the burr to extend toward the pin or directly bridge the gap, causing the insulation resistance to drop sharply from 550 MΩ to 0 MΩ. Vibration stress can detach fine and weak burrs, restoring insulation, or extend bent burrs, leading to insulation degradation. Under combined stresses, a hidden failure mode of “vibration recovery and electrostatic re-degradation” exists, where a detached burr migrates again under the Lorentz force and causes a short circuit. The influence of metallic foreign matter depends on its initial length, position, and adhesion strength. Only burrs in a “critical state” (moderate adhesion strength, close to the pin, and sufficient length to bridge the gap and trigger air breakdown) are sensitive to external stresses. It is recommended to add a sequential “ESD after vibration” test in the reliability assessment of pyrotechnics to comprehensively evaluate the risk of insulation failure caused by metallic foreign matter.