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NiCrAlY/ZrO₂-Y₂O₃ 복합코팅의 산화에 따른 조직관찰
박기범(G. B. Park),박진오(J. O. Park),이동복(D. B. Lee) 한국표면공학회 2001 한국표면공학회지 Vol.34 No.2
The microstructural changes of NiCrAlY/ZrO₂-Y₂O₃ composite coatings that were manufactured by air-plasma-spraying were investigated using XRD and SEM/EDS. The as-sprayed microstructure consisted of (Ni,Cr)-rich regions, (ZrO₂-Y₂O₃)-rich regions, and Al₂O₃-rich layers that were formed during spraying owing to the oxidation of Al in NiCrAlY. During oxidation between 900 and 1100℃ in air, Cr in the (Ni,Cr)-rich regions diffused toward the Al₂O₃-rich layers, and oxidized to be dissolved in Al₂O₃-rich layers. The oxidation of Ni in the (Ni,Or) -rich regions was less distinct, except at the outer surface of the coating.
내화충전구조 인정제도의 성능기준 및 등급분류 개선에 관한 연구
이형도,최윤정,안재홍,정아영,서희원,박진오,Lee, H.D.,Choi, Y.J.,An, J.H.,Jeong, A.Y.,Seo, H.W.,Park, Jin O 한국안전학회 2020 한국안전학회지 Vol.35 No.4
The fire compartments with fire-resistant construction are installed in the principal structural parts of a building in order to reduce damage in the event of a building fire. As a fire may spread through a crack in the fire compartment, the firestop with secured performance is used according to the procedure, methods, and standards specified in the detailed operation guideline. According to the current detailed operation guideline, vertical members (wall penetration) and horizontal members (floor penetration) are classified into different categories respective to each other for the classification of the firestop. Therefore, an accreditation applicant must apply for the performance test for each structure even if the wall and the floor have the same structure. Also, Grade T is used for the firestop that penetrates the fire compartment. However, in the case of foreign countries, the use of Grade F for the firestop is allowed even if it penetrates the fire compartment. The result of the precedent studies also showed that there was a significantly low possibility of fire to spread even if Grade F was applied for a metallic duct that penetrated the fire compartment. In this study, the improved scheme for the classification and performance standard of firestops was presented by analyzing the results of precedent studies regarding the firestop and domestic and overseas firestop qualification systems.