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고청아(Cheongah Go),박영철(Youngchul Park),서태석(Taeseok Seo),문영택(Youngtaek Moon),김준형(Junhyung Kim) 한국추진공학회 2018 한국추진공학회 학술대회논문집 Vol.2018 No.12
세 가지 다른 온도(60℃, 70℃ 그리고 75℃)에서 약 1년 동안 복기추진제의 가속 노화 시험을 수행하였다. 노화 특성을 평가하기 위해 고성능 액체크로마토그래피와 AKTS사의 Thermokinetics 소프트웨어를 활용하여 추진제의 안정제 함량과 속도론적 분석을 수행하였다. 그 결과, 추진제의 안정제 함량은 노화 온도 및 노화 기간에 따라서 점차적으로 감소하였다. 75℃에서의 안정제 감소 속도는 70℃와 비교하여 약 2배 정도 빠른 것으로 나타났다. 이러한 실험값들을 속도론적 SB 모델과 2단계 모델로 모사하였고, n1=1, n2=0에서 실제데이터를 가장 잘 모사하였다. The accelerated aging test for the double base propellant has been carried out at three different temperatures (60℃, 70℃ and 75℃) for around one year. The stabilizer contents and thermal decomposition kinetics of double base propellant were analyzed using high performance liquid chromatography and AKTS’s Thermokinetics software in order to evaluate the aging characteristics. As a result, the stabilizer contents in double base propellant gradually decreased according to temperature and duration. The consumption rate of stabilizer in double base propellant showed 2 times faster at 75℃ compared to at 70℃. These experimental values were simulated by SB kinetic models, and it was shown that the two-step model with constant reaction orders n1=1 and n2=0 best describes the process of the stabilizer depletion for the double base propellant.
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열중량분석법에 의한 Boron-Potassium Nitrate(BKNO₃)의 열분해 특성 연구
고청아(Cheongah Go),김준형(Junhyung Kim),박영철(Youngchul Park),문영택(Youngtaek Moon),서태석(Taeseok Seo),류병태(Byungtae Ryu) 한국추진공학회 2019 한국추진공학회지 Vol.23 No.2
The thermal decomposition characteristics of boron-potassium nitrate (BKNO₃) were investigated by non-isothermal thermal gravimetric analysis (TGA). Two steps of mass loss were observed in the temperature range between room temperature and 600 ℃. Kinetic parameters of the thermal decompositions were evaluated from the measured TGA curves using the AKTS Thermokinetics Software. For the first step of mass loss (220–360 ℃) corresponding to the thermal decomposition process of the binder (Laminac/Lupersol), the activation energy is in the range of approximately 120–270 kJ/mol when evaluated by Friedman’s iso-conversional method, while the value of activation energy varies in the range of approximately 150–400 kJ/mol during the second step process (360–550 ℃).
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고청아(Cheongah Go),박영철(Youngchul Park),서태석(Taeseok Seo),문영택(Youngtaek Moon),김준형(Junhyung Kim) 한국추진공학회 2019 한국추진공학회지 Vol.23 No.4
Accelerated aging test for the double base propellant was carried out at three different temperatures (60, 70, and 75 ℃) for over a year. To evaluate the aging characteristics of the double base propellant, the stabilizer contents and thermal decomposition kinetics were analyzed by using high performance liquid chromatography (HPLC) and AKTS-Thermokinetics software. As a result, stabilizer contents in the double base propellant gradually decreased according to the aging temperature and aging duration. The consumption rate of 2-NDPA in the accelerated aged propellants showed that it was two times faster at 75 ℃ in compared with ther rate at 70 ℃. These experimental values were simulated by the SB kinetic model, and it was shown that the two-step model with constant reaction orders n1=1 and n2=0 best describes the process of the stabilizer depletion for the double base propellant.
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