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김준형(Junhyung Kim),서태석(Taeseok Seo),고승원(Seungwon Ko),류병태(Byungtae Ryu) 한국추진공학회 2015 한국추진공학회 학술대회논문집 Vol.2015 No.5
착화기의 1차 점화장약으로 널리 사용되어지고 있는 ZPP(Zirconium/Potassium perchlorate)의 열분해 특성을 DSC를 사용하여 평가하였다. ZPP의 열분해반응에 대한 속도론적 파라미터를 결정하기 위하여, 다른 가열 속도를 갖고 수행된 DSC 결과들을 AKTS사의 Thermokinetics software를 사용하여 분석하였다. 결정된 속도론적 파라미터를 사용하여 계산된 모사값들은 실험적 결과들과 잘 일치함으로써, ZPP의 열분해과정에 대한 속도론적 모사의 유효성을 검증할 수 있었다. The thermal decomposition characteristics of the ZPP(Zirconium/Potassium perchlorate), widely used as a primary charge of initiators, were investigated by differential scanning calorimetry(DSC). The DSC results with different heating rates were elaborated with AKTS-Thermokinetics software for the determination of the kinetic parameters of the thermal decomposition of ZPP. There was good agreement between the experimental and the simulation curves, based on the determined kinetic parameters, which indicates the validity of the kinetic description of the thermal decomposition process of ZPP.
김준형(Junhyung Kim),서태석(Taeseok Seo),고승원(Seungwon Ko),류병태(Byungtae Ryu) 한국추진공학회 2015 한국추진공학회지 Vol.19 No.5
The thermal decomposition characteristics of the ZPP(Zirconium/Potassium perchlorate), widely used as a primary charge of initiators, were investigated by differential scanning calorimetry(DSC). The DSC results with different heating rates were elaborated with AKTS-Thermokinetics software for the determination of the kinetic parameters of the thermal decomposition of ZPP. There was good agreement between the experimental and the simulation curves, based on the determined kinetic parameters, which indicates the validity of the kinetic description of the thermal decomposition process of ZPP.
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.
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.
유지창(Jichang Yoo),김준형(Junhyung Kim),김창기(Changkee Kim),서태석(TaeSeok Seo) 한국추진공학회 2009 한국추진공학회 학술대회논문집 Vol.2009 No.11
본 연구에서는 HTPE 추진제 원료 및 HTPE 둔감 추진제 조성 2종에 대하여 DSC와 TGA를 사용하여 열분해 특성을 고찰하였다. AN이 포함된 HTPE 002는 약 125℃에서 AN의 상전이 과정(Ⅱ→Ⅰ)을 거친 후, 약 200℃범위까지 BuNENA와 AN이 함께 발열특성을 가지고 분해됨을 알 수 있었다. 추진제 HTPE 001과 HTPE 002의 열폭발에 대한 임계온도, Tc,를 Semenov의 열폭발 이론과 몇가지 가열속도에서 측정된 비등온 곡선으로부터 계산되었고, 임계온도 계산에 사용된 열분해에 대한 활성화 에너지는 Kissinger방법으로 측정하였다. This study was investigated to know the thermal decomposition for the propellant ingredients and 2 kinds of HTPE propellants. The thermal analysis of the propellant ingredients used in this study showed that the thermal stability of these materials decreases in the following order : AP > HTPE > AN > BuNENA. In addition, propellant HTPE 002 containing AN showed that an endothermic process at around 125℃ corresponding to the solid-solid phase change(Ⅱ→Ⅰ) of AN was followed by the exothermic process due to decomposition of BuNENA/AN until 200℃. The critical temperature, Tc, of thermal explosion for the propellants HTPE 001 and HTPE 002, were obtained from the non-isothermal curves at various heating rates, by using Semenov"s thermal explosion theory. Kissinger"s method was employed to obtain the activation energy of the thermal decomposition, and it was used to calculate the Tc.