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질화상압(NPS)법으로 제조한 질화규소의 열충격 저항성 및 내부식성 특성평가
곽길호,김철,한인섭,이기성,Kwak, Kil-Ho,Kim, Chul,Han, In-Sub,Lee, Kee-Sung 한국세라믹학회 2009 한국세라믹학회지 Vol.46 No.5
Thermal shock and hot corrosion resistance of silicon nitride ceramics are investigated in this study. Silicon nitrides are fabricated by nitride pressureless sintering (NPS) process, which process is the continuous process of nitridation reaction of Si metal combined with subsequent pressureless sintering. The results of thermal shock test show it sustains 400MPa of initial strength during test in the designated condition of ${\Delta}T=700{\sim}25^{\circ}C$ up to maximum 4,800 cycles. Hot corrosion tests also reveal that the strength degradation of NPS silicon nitride did not occur at $700^{\circ}C$ with an exposure in Ar, $H_2$, Na and K for 1,275 h.
심병철,곽길호,이성민,오윤석,김형태,장병국,김성원,Shim, Byung-Chul,Kwak, Kil-Ho,Lee, Sung-Min,Oh, Yoon-Suk,Kim, Hyung-Tae,Jang, Byung-Koog,Kim, Seong-Won 한국분말야금학회 2010 한국분말재료학회지 (KPMI) Vol.17 No.2
Thermal barrier systems have been widely investigated over the past decades, in order to enhance reliability and efficiency of gas turbines at higher temperatures. Yttria-stabilized zirconia (YSZ) is one of the most leading materials as the thermal barriers due to its low thermal conductivity, thermodynamic stability, and thermal compatibility with metal substrates. In this work, rare-earth oxides with pyrochlore phases for thermal barrier systems were investigated. Pyrochlore phases were successfully formed via solid-state reactions started from rare-earth oxide powders. For the heat-treated samples, thermo-physical properties were examined. These rare-oxide oxides showed thermal expansion of $9{\sim}12{\times}10^{-6}/K$ and thermal conductivity of 1.2~2.4 W/mK, which is comparable with the thermal properties of YSZ.
박광림 ( Park Gwang Rim ),곽길호 ( Kwak Kil Ho ),백남철 ( Back Nam Cheol ),조용성 ( Cho Yong Sung ) 한국구조물진단유지관리공학회 2017 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.21 No.1
There is also a reverse cavity in the back of the domestic subway and railways and roads, which cause a rift in tunnel structures due to stress concentration and strain. As a result, the balsaeng of the tunnel on the back of the tunnel was interpreted as a method to determine the method of a structural structure which greatly affects the stability of the tunnel structure.
Hybrid PVD로 제조된 Ti-Me-N (Me=V, Si 및 Nb) 나노 박막의 미세구조와 마모특성
양영환(Young-hwan Yang),곽길호(Kil-ho Kwak),이성민(Sung-min Lee),김성원(Seong-won Kim),김형태(Hyung-tae Kim),김경자(Kyung-ja Kim),임대순(Dae-soon Lim),오윤석(Yoon-suk Oh) 한국표면공학회 2011 한국표면공학회지 Vol.44 No.3
Ti based nanocomposite films including V, Si and Nb (Ti-Me-N, Me=V, Si and Nb) were fabricated by hybrid physical vapor deposition (PVD) method consisting of unbalanced magnetron (UBM) sputtering and arc ion plating (AIP). The pure Ti target was used for arc ion plating and other metal targets (V, Si and Nb) were used for sputtering process at a gas mixture of Ar/N2 atmosphere. Mostly all of the films were grown with textured TiN (111) plane except the Si doped Ti-Si-N film which has strong (200) peak. The microhardness of each film was measured using the nanoindentation method. The minimum value of removal rate (0.5×10<SUP>?15</SUP> ㎡/N) was found at Nb doped Ti-Nb-N film which was composed of Ti-N and Nb-N nanoparticles with small amount of amorphous phases.
신상협 ( Shin Sang-hyup ),박광림 ( Park Kwang-rim ),이민수 ( Lee Min-soo ),곽길호 ( Kwak Kil-ho ),박준용 ( Park Jun-yong ) 한국구조물진단유지관리공학회 2019 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.23 No.1
This Study reviewed the case of Gyeonggi-do province which recently induced Drone to pavement management system in order to research a plan to utilize recent technology Drone to pavement management system which is being operated depending on vehicles and manpower for 30 years. After filming video on local roads managed by Gyeonggi-do province by using Drone directly and created point cloud having three dimensional coordinate and color value through program analysis. Furthermore, this research showed that when we found similar color to point cloud at pavement crack part and applied color, crack part was detected.
권영정 ( Kweon Young Jung ),박광림 ( Park Gwang Rim ),곽길호 ( Kwak Kil Ho ),길태형 ( Gil Tae Hyung ),백남철 ( Back Nam Cheol ) 한국구조물진단유지관리공학회 2018 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.22 No.1
We have identified the subway of structures as subway station users complained of vibrations from a structures when they walked through middle stairs of escalator. As a result of converting the vibration level to the conversion rate, it was measured at 3.846mm/s(82.7dB) on the B1st floor and 0.966mm/s(70.7dB) on the B2nd floor. These results are higher than the domestic standard of 65dB and lower than the international standard of under 5mm/s. It is felt well with the human body, but the structure is considered to be harmless. Therefore, it is deemded the structure is safe to usue. As the result of measuring the national frequency, the stairs on the B1st floor to be 3.01Hz and the stairs B2nd floor to be 5.36Hz. We consider that the users feel discomfort and anxiety on the B1st floor, where displacement and vibrations are higher.