US EPA

8168383 

Journal Article 

AP/HTPB composite propellant using fine hollow AP prepared by spray-drying method 

Kohga, M; Hagihara, Y 

2003 

64 

2 

75-80 

English 

Fine ammonium perchlorate (AP) is required in order to prepare a high burning rate AP based composite propellent. Fine hollow AP(FAP), of which the mean volume-surface diameter is about 2.7μm, is prepared by the spray-drying method. The crystallographical property and the thermochemical behavior of FAP, and the productivity and the burning rate characteristics of the propellant prepared with FAP were investigated in this study. The results were as follows; The crystallographical property and the thermochemical behavior of FAP are almost the same as those of the ground commercial AP(CAP). The upper limit of the FAP content in propellant is 72 wt%. The propellant was prepared at 80 wt% AP with a bimodal AP, FAP and CAP. The burning rate of the propellant contained 80 wt% AP with a bimodal AP, which was different in the relative amounts of FAP and CAP, increases with increasing the content of FAP. The increment of burning rate at high pressures is larger than that at low pressures. It is found that FAP is an effective oxidizer for the increase in the burning rate.