为研究溶剂压伸法制备的AP-CMDB推进剂低温发动机试验易产生碎药的原因，采用扫描电子显微镜(SEM)和能谱仪(EDS)观察了AP-CMDB推进剂样品的微观结构；通过测试样品的线膨胀系数，研究了AP颗粒与黏合剂体系的线膨胀匹配性；讨论了药形尺寸对推进剂低温抗冲强度的影响。结果表明，溶剂压伸法制备的AP-CMDB推进剂药柱中存在大量微孔和少量微裂纹，AP颗粒团聚明显，Al颗粒与黏合剂体系间出现严重的界面脱粘；AP颗粒与黏合剂体系间的线膨胀匹配性较差；壁厚1.5mm的单孔管状药柱的低温(-40℃)抗冲强度低于壁厚4.5mm的，套管结构药柱的低温(-40℃)抗冲强度低于单孔管状药柱的。AP-CMDB推进剂低温碎药的形成与其微观结构、力学性能及药形尺寸有关。

Potassium dihydroxyglyxime (DHGK) was synthesized via oximation reaction and salt formation using hydroxyamine hydrochloride as a staring material. The structure of DHGK was characterized by IR, NMR and elemental analysis.The gun propellant charge containing DHGK was prepared. The muzzle flame and smoke and combustion residue of gun propellant were measured by high speed photography method, smoke box method and oxygen bomb method, and the interior ballistic performance was investigated by the means of 5.8mm interior ballistic test．The results show that replacing the common flame inhibitor K2SO4 and KNO3 with DHGK makes the flame area decrease by 70.7%, flame temperature reduce by 400K, muzzle flame and smoke and combustion residue decrease, revealing that DHGK has better effect on the decrease of muzzle flame and smoke. The gun propellant charge adding DHGK can enhance the muzzle velocity and has good interior ballistic stability.