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저온 분사 티타늄 코팅층의 특성 및 적층 거동에 미치는 분말 형상과 분말 예열의 영향
황재남,이명주,김형준,오익현,이기안,Hwang, Jae-Nam,Lee, Myeong-Ju,Kim, Hyung-Jun,Oh, Ik-Hyun,Lee, Kee-Ahn 한국분말야금학회 2012 한국분말재료학회지 (KPMI) Vol.19 No.5
Cold spray deposition using Titanium powder was carried out to investigate the effects of powder morphology and powder preheating on the coating properties such as porosity and hardness. The in-flight particle velocity of Ti powder in cold spray process was directly measured using the PIV (particle image velocimetry) equipment. Two types of powders (spherical and irregular ones) were used to manufacture cold sprayed coating layer. The results showed that the irregular morphology particle appeared higher in-flight particle velocity than that of the spherical one under the same process condition. The coating layer using irregular morphology powder represented lower porosity level and higher hardness. Two different preheating conditions (no preheating and preheating at $500^{\circ}C$) were used in the process of cold spraying. The porosity decreased and the hardness increased by conducting preheating at $500^{\circ}C$. It was found that the coating properties using different preheating conditions were dependent not on the particle velocity but on the deformation temperature of particle. The deposition mechanism of particles in cold spray process was also discussed based on the experimental results of in flight-particle velocity.
황재남 ( Hwang Jae Nam ),이승태 ( Lee Seung Tae ),하상욱 ( Ha Sang Wook ),박광필 ( Park Kwang Pil ) 한국구조물진단유지관리공학회 2018 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.22 No.2
This research provides the baseline data for choosing the inorganic/organic hybrid material as the repairing solution by analyzing its efficiency in securing high vibration resistance and very low permeability. As a result of analysis of the mechanical properties of hybrid composite mortar, the strength increased with age. Therefore, it is considered that an inorganic binder having a certain amount or more is required for high strength development.
황재남 ( Hwang Jae Nam ),이승태 ( Lee Seung Tae ),박광필 ( Park Kwang Pil ),하상욱 ( Ha Sang Wook ) 한국구조물진단유지관리공학회 2018 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.22 No.2
This thesis will provide the baseline data of a suitable road repairing solution by analyzing the freeze-and-thaw resistance of inorganic-organic hybrid mortar. The resilience of polymer mortar and high-elastic mortar to freeze thaw resistance showed that the high-elastic mortar showed excellent resistance.
이승태(Lee, Seung-Tae),김환중(Kim, Hwan-Jung),황재남(Hwang, Jae-Nam) 한국구조물진단유지관리학회 2010 한국구조물진단학회 학술발표회논문집 Vol.2010 No.2
This study describes experimental results of cement mortars incorporating GGBS with different curing methods. Compressive strength and RCPT test were performed on mortar samples. As a result, steam curing has a beneficial effect on the performance of mortar samples at earlier stage of curing, but a negative effect at a later stage.
박광필 ( Park Kwang Pil ),이승태 ( Lee Seung Tae ),황재남 ( Hwang Jae Nam ),하상욱 ( Ha Sang Wook ) 한국구조물진단유지관리공학회 2018 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.22 No.2
This study is to analyze the causes of damage on additional facilities in road. In this study, lab test was performed using field core sample. The result of The compressive strength of concrete is met with the design regulations. However, the chloride content of in concrete increased up to 2cm. The microstructure and reactant analysis identified an expanding substance on the surface. However, as the time increases, the depth is expected to be deep.