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백종규 ( Jong Gyu Paik ),류병태 ( Byung Tae Ryu ),권미라 ( Mi Ra Kwon ) 한국화학공학회 2014 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.52 No.2
본 연구에서는 점화제로 사용되는 B-KNO3의 가속노화 실험에 따른 특성변화를 고찰하였다. 점화제는 보관 방법이나 보관기간에 따라 점화 효율이 저하되는 경향이 있으며 안정된 사용을 위해서는 이에 대한 명확한 이해가 필요하다. 따라서 노화에 대한 원인 규명을 위해 가속화 시험 시편의 미세구조와 결정구조 및 열 분석을 수행하였으며 점화 특성에 끼치는 영향성을 규명하고자 하였다. 산화제로 첨가된 KNO3의 결정구조를 분석함으로써 노화에 끼치는 산화제 영향을 해석하였다. 결론적으로 산화제의 결정구조가 안정한 구조로 변화되었으며 활성화 에너지변화에 영향을 끼쳤다. This research investigated the aging properties of the B-KNO3 system as the igniter. The B-KNO3 system showed the degradation in ignition properties depending on the method and period of storage. It should be found out the cause of the degradation to predict the reliability of the igniters. The changes of the properties by the degradation after aging tests were analyzed by microstructure analysis, XRD analysis and thermal analysis using DSC. It was found out that the lattice parameters of the KNO3 as the oxidizer in the ignition system was changed into the JCPDS values as the aging time increased. Conclusively, the changes of the crystal structure of oxidizer affected the activation energy increasing as aging time increased.
백종규(Jong Gyu Paik),류병태(Byung Tae Rhu),권미라(Mira Kweon),이철우(Cheol Woo Lee),양지우(Jee Woo Yang) 한국추진공학회 2013 한국추진공학회 학술대회논문집 Vol.2013 No.12
B-KNO₃의 노화에 대한 원인을 규명하기위해 B-KNO₃ 점화제의 가속화 시험을 통한 노화특성을 해석하였다. 본 점화제는 미사일 고체 추진제에 사용되는 효과적인 점화제 중 하나로 저압 점화가 용이하고 연소 속도가 비교적 빠르고 안정되며 최대 압력 형성이 균일하다는 장점을 지니고 있다. 그러나 이들 점화제는 보관 방법이나 보관기간에 따라 점화 효율이 저하되는 경향이 있으며 안정된 사용을 위해서는 이에 대한 명확한 이해가 필요하다. 이를위해 미세구조와 결정구조 및 열분석을 통해 환경시험 조건에서 발생되는 변화를 이해하고 이들이 점화 특성에 끼치는 영향성을 규명하였다. 따라서 미세구조와 결정구조 및 열분석을 통해 환경시험 조건에서 발생되는 변화를 이해하고 이들이 점화 특성에 끼치는 영향성을 규명하고자 하였다. 특히 산화제로 첨가된 KNO₃의 내부 구조 변화를 심층 분석함으로써 점화제 노화에 끼치는 산화제 영향을 해석하였다. Aging effects on the B-KNO₃ mixture were investigated by analyzing the results of the accelerated environmental aging tests. The B-KNO₃ system is one of the most effective ignitor which could be applicable for solid rocket propellants of missiles. There are many good properties in B-KNO₃ system for the ignitor such as easy ignition at low pressure, high speed and stable combustion, and uniform formation of maximum pressure. However those ignitor systems showed the degradation in ignition properties depending on the method and period of storage. It should be found out the cause of the degradation. The main cause of the degradation was analyzed by microstructure analysis, XRD analysis and thermal properties analysis using DSC. It was found out that the lattice parameters of the KNO₃ as the oxidizer in the ignition system was changed into original value as the aging time increased. From this study the change of the crystal structure of oxidizer during the storage could be related to the aging properties of ignitor system.
전복껍질 메소절편 기반 복합소재 합판 제작 및 이를 이용한 하이브리드 판재의 방탄특성
김정우,강대원,백종규,육영기,박정호,신상모,Kim, Jeoung Woo,Kang, Dae Won,Paik, Jong Gyu,Youk, Youngki,Park, Jeong Ho,Shin, Sang-Mo 한국재료학회 2019 한국재료학회지 Vol.29 No.1
Nacre of abalone shell features a "brick-and-mortar" microstructure, in which micro-plates of calcium carbonate are bonded by nanometers-thick layers of chitin and proteins. Due to the microstructure and its unique toughening mechanisms, nacre possesses an excellent combination of specific strength, stiffness and toughness. This study deals with the possibility of using nacre fragments obtained from abalone shell for making a bulletproof armor system. A composite plate laminated with abalone shell fragments is made and compression and bend tests are carried out. In addition, a bulletproof test is performed with hybrid armor systems which are composed of an alumina plate, a composite plate, and aramid woven fabric to verify the ballistic performance of nacre. The compressive strength of the composite plate is around 258.3 MPa. The bend strength and modulus of the composite plate decrease according to the plate thickness and are about 149.2 MPa and 50.3 GPa, respectively, for a 4.85 mm thick plate. The hybrid armor system with a planar density of $45.2kg/m^2$, which is composed of an 8 mm thick alumina plate, a 2.4 mm thick composite plate, and 18 layers of aramid woven fabric, satisfy the NIJ Standard 0101.06 : 2008 Armor Type IV. These results show that a composite plate laminated with abalone shell fragments can be used for a bulletproof armor system as an interlayer between ceramic and fabric to decrease the armor system's weight.
DSC 열분석을 통한 ZPP 화약의 장기 노화 반응 예측
김태완(Taewan Kim),이주현(Joohyeon Lee),편임옥(Limok Pyeon),백종규(Jong Gyu Paik),이승복(Seung Bok Lee),박태호(Taiho Park) 한국추진공학회 2015 한국추진공학회 학술대회논문집 Vol.2015 No.11
파이로 작동기구의 핵심 점화제인 ZPP의 노화반응을 differential scaning calorimetry(DSC) 분석과 상업적인 소프트웨어인 “Advanced Kinetics and Technology Solutions(AKTS)” 프로그램을 이용하여 예측하고자 하였다. 200℃ 이상의 고온에서도 노화반응이 상당히 지연됨을 확인하였고, 이는 ZPP의 폭발시작반응의 온도가 높고 활성화 에너지 역시 높은 값을 가지기 때문으로 여겨진다. Long-term aging of ZPP, which is a core ignitor in pyrotechnic mechanical device (PMD) has been investigated using differential scaning calorimetry(DSC) combined with a commercial software (Advanced Kinetics and Technology Solutions(AKTS)). We found that the aging has been delayed even at the elevated temperature (~200 oC). It could be ascribed to high explosion initiation temperature and activation energy of ZPP.
기공율, 응력 및 입자 크기가 B-H Hysteresis loop 특성에 미치는 영향 연구
김성재(Seung-Jae Kim),정명득(Myung-Deuk Jeong),백종규(Jong-Gyu Paik) 한국자기학회 1994 韓國磁氣學會誌 Vol.4 No.2
Effects of density; inner-stress, and grain size on B-H hysteresis loop properties of Mg-ferrite were investigated.<br/> As the sintered bulk density increase, coercive force (Hc) decreasand squareness ratio increase. Coercive force was very dependent on inner-stress in sintered body, so coercive force increase from 1.95[Oe] to 4.35[Oe] when inner stress present in bulk, however, the squareness ratio was almost not changed. Coercive force and squareness ratio were independent on grain size of sintered body which is between 6-11 [㎛]