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최송천 대한기계학회 2008 기계저널 Vol.48 No.6
이 글에서는 최근 해외 플랜트 건설시장의 활성화와 함께 안전성과 건전성 평가기술이 크게 대두됨에 따라 정유 및 석유화학 플랜트 설비의 위험도(risk)에 근거한 진단 평가 기술에 대하여 소개하고자 한다.
Ni_3Al 金屬間 化合物의 高溫酸化時 酸化膜의 剝離에 關한 硏究
崔松天,李東馥 成均館大學校 科學技術硏究所 1995 論文集 Vol.46 No.1
The high temperature oxidation behavior of the intermetallic compound of pure Ni_3Al was studied above 1000℃. In isothermal oxidation tests between 1000-1200℃, Ni_3Al showed parabolic oxidation behavior and displayed excellent oxidation resistance. In cyclic oxidation test, Ni_3Al exhibited excellent oxidation resistance but the drastic spalling of oxide scales was observed at 1300℃. Al_2O_3 was present as θ-Al_2O_3 in a whisker form at 1000℃, but, as the temperature increases, thermodynamically metastable θ-Al_2O_3 was transformed to stable α-Al_2O_3. At 1200℃, α-Al_2O_3 having an equiaxed structure in the outermost scale and columnar structure inside was present. Scale spalling it Ni_3Al was attributed to the kirkendall voids formed at the metal/oxide interface, which act as the source of stress concentration.
최송천(Song-Chun Choi),박기태(Gi-Tae Park),이장우(Jang-Woo Lee),최병학(Byung Hak Choe) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
Natural gas suppliers, natural gas vehicle operators, CNG bus manufacturing companies, and various government agencies are concerned about safety operation of CNG vehicles, in particular with regard to the potential risk to cause leakage to surfaces of CNG cylinders. Therefore, the purpose of this study was to identify defect present in the accident cylinder and to analyze the cylinder materials for conformance with appropriate specifications. Nondestructive inspections of the accident cylinder were performed to locate flaws on metal surfaces, and metallurgical examinations of selected portions of metal surfaces were conducted to determine the nature and extent of crack growth.