Study on the Design and Process of Coating for Double-base Propellant Used in Some Gas Generator
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摘要:针对某型燃气发生器内弹道性能试验中，出现实测曲线偏离设计基准的问题，通过分析试验数据，并结合包覆材料性能及阻燃机理，确定原因为原包覆材料硝基油漆布在包覆粘接后使推进剂出现了硝化甘油迁移现象，从而影响了推进剂能量与燃速，使产品内弹道性能发生变化。改进设计采用一种聚氨酯材料及浇注包覆工艺对推进剂进行包覆，并进行产品内弹道性能测试，结果表明包覆材料及工艺更改后内弹道曲线更接近设计曲线，产品可靠性更高。
Abstract:In the ballistic performance test of some gas generator, the problem that the measured curve deviates from the design basis was appeared. By analyzing the test data, combining with the properties of the coating material and the flame retardant mechanism, the reason is determined that the nitroglycerin migration phenomenon occured in the propellant after the coating and bonding, thus the energy and burning rate was changed, as well as the internal ballistic performance of the product. Then, by using a polyurethane material and cast coating process to coat the propellant, and carring out the internal ballistic performance test, the internal ballistic curve of improved coating is closer to the design curve, the product reliability is higher than before.
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