Contrast with single base gun propellant with polymer coating layer, the two-layered variable-burning rate propellant has good properties of progressive combustion and low temperature coefficient.
与高分子包覆单基发射药相比，双层结构变燃速发射药具有较好的燃烧渐增特性和明显的低温度系数效果。
The results show that the ceramic coating is composed of a two-layer structure with the surface loose zone and the inner compact zone.
结果表明，陶瓷膜具有内部致密层和外部疏松层两层结构，膜层与铝基体为冶金结合。
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