Abstract: In this paper, the observation of the burning processes of AP-PU sandwiches with and without CaCO3 by means of the loser-shadow high speed cinephotomi-crography, analysis of burning surface of some samples with scanning electron microscope, and examination of the burning surface of AP-PU solid composite propellant by X-ray photoelectron spectroscopy are discribed. Based on the above experiments, a knid of mechanism of the effects of CaCO3 upon AP burning rates has been proposed to explain the reason of increasing of burning rate at low pressure (<1.96MPa) and decreasing at high pressure (>1.96MPa).

Key words: Composite propellant;Additive of solid propellant;Catalysis

摘要： 本文通过试件燃烧表面激光阴影高速摄影、燃面扫描电镜分析和X光电子能谱测试结果,提出了CaCO₃与过氯酸铵（AP）的作用机理,解释了CaCO₃对AP的低压（<1.96MPa）增速高压（>1.96MPa）降速的现象.

关键词: 复合推进剂;固体推进剂添加剂;催化