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Science and Technology of Energetic Materials

Vol.61, No.2 (2000)

Research paper

AP/HTPB composite propellant using fine AP prepared by freeze-drying method(IV)
- Fine AP prepared from emulsion with toluene and AP solution -
Makoto Kohga and Yutaka Hagihara
p.51-57

Abstract

Fine ammonium perchlorate(FAP), of which the mean volume-surface diameter is about 3.9 μm, is prepared by freeze-drying method. The crystallographical property and the thermochemical behavior of FAP, and the productivity and burning rate characteristics of the propellant prepared from FAP were investigated in this study. Hydroxyl-terminated polybutadiene (HTPB) was used as a binder. The results are as follows; 1)The crystallographical property and the thermochemical behavior of FAP are almost the same as those of the commercial AP. 2) The upper limit content of FAP containing propellant, Φmax (wt%), is 80 wt%. The burning rate measured at 7 MPa of the propellant containing 80 wt%FAP is 24.6 mm/s. 3) The burning rate increases with increasing the FAP content. The increment of the burning rates at high pressures is larger than that at low pressures, and particularly the increment of the burning rate increases greatly with coming close to Φmax . 4) When HTPB prepolymer added sodium lauryl sulfate was used as a binder, Φmax of the propellant prepared from PAP was 82 wt%. By the use of HTPB prepolymer added sodium lauryl sulfate, Φmax of FAP could be increased by 2 wt%. The burning rate measured at 7 MPa of the propellant containing 82 wt%FAP was 30.1 mm/s. The burning rate could be increased by a slight increase in Φmax of FAR. It is found that FAP is an effective oxidizer to prepare high burning rate AP/HTPB composite propellant.

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