Journal of the Korean Society of Propulsion Engineers (한국추진공학회지)

The Korean Society of Propulsion Engineers (한국추진공학회)
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Effect of AP Particle Size on the Physical Properties of HTPB/AP Propellant

AP 입자가 HTPB/AP 추진제의 물리적 특성에 미치는 효과

  • Yim, Yoo Jin (Development Team, Daejeon Plant, Hanwha Corporation) ;
  • Park, Eun Ji (Development Team, Daejeon Plant, Hanwha Corporation) ;
  • Kwon, Tae Ha (Development Team, Daejeon Plant, Hanwha Corporation) ;
  • Choi, Seong Han (Development Team, Daejeon Plant, Hanwha Corporation)
  • Received : 2015.11.30
  • Accepted : 2015.12.22
  • Published : 2016.02.01
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Abstract

The viscosity and mechanical property of HTPB/AP composite solid propellant are profoundly affected by particle size of AP. In HTPB/AP propellant formulated by two mode of AP size such as $190{\mu}m$ and $7{\mu}m$, the propellant was found to be much less viscose at end of mix when coarse/fine AP ratio is ranged from 70/30 to 60/40 due to high solid packing fraction. It was shown that the toughness of tensile strength test for HTPB/AP propellant increased with the increase in coarse AP. Considering both lower viscosity and better tensile strength, the optimum ratio of AP coarse/fine was estimated to be 70/30.

HTPB/AP계 혼합형 고체 추진제의 점도와 기계적 특성은 산화제인 AP의 입자 크기에 크게 영향을 받는다. $190{\mu}m$의 크기의 AP와 $7{\mu}m$ 크기의 AP를 사용한 HTPB/AP 추진제에서 큰 입자/작은 입자의 비율이 70/30~60/40 범위인 조성의 추진제가 매우 낮은 점도를 나타났는데, 이것은 고체입자의 충전율이 높은 상태이기 때문이다. 추진제의 인장강도 시험에서 Toughness는 큰 입자의 함량이 많아질수록 증가하는 것으로 나타났다. 낮은 점도와 좋은 인장강도를 동시에 고려할 때, AP 큰 입자와 작은 입자를 70/30으로 사용하는 것이 가장 효과적인 것으로 분석되었다.

Keywords

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