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강신호(S.H. Kang),최희숙(H.S. Choi),양성호(S.H. Yang),이정혁(J.H. Yi) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
Recently, a number of the heavy duty gas turbines have been installed in several power plants in Korea. The gas turbines are newer models, which are categorized as a 1300 class engine, adopting the upgraded materials and the protective technologies such as coating and cooling. Therefore corresponding technology development for repair and rejuvenation of hot gas path components are inevitable. The higher operational temperature accelerates material degradation as well as thermally induced stress in the components. To prevent catastrophic failure, the periodic repair using adequate knowledge and processes are essential. In order to cure thermal stress cracking occurred in fixed vanes, Activated Diffusion Healing is now a versatile solution following the hydrogen or fluoride ion cleaning. For early stage of the creep damaged materials for rotating blades, Hot Isostatic Pressing (HIP) or rejuvenation heat treatment is applicable to encourage metallurgical recovery. These are the state of the art technologies that are immediately available in Korea.
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HVOF 용사된 NiCoCrAlIr 코팅의 산화막 관찰
고재황,이정혁,이동복 대한금속재료학회 2004 대한금속·재료학회지 Vol.42 No.4
High velocity oxy-fuel sprayed 34Co-32Ni-22Cr-10Al-0.4Ir coatings were oxidized between 1000 and 1200℃ in air, and the oxide scales were investigated by XRD, SEM/EDS, and EPMA. The unoxidized coatings consisted mainly of γ-Ni_(3)Al, with some y-Ni and a meager amount of Cr_(2)O_(3). The major oxide formed on the coatings was α-Al_(2)O_(3). Additionally, spinels of CoCr_(2)O_(4) and CoAl_(2)O_(4) coexisted. Neither Ni- nor Ir-xoides were detected by XRD owing to thermodynamic nobility that resist oxidation or their small amount in the oxide scale. Iridium seemed to deter the formation of sound oxide scales. (Received November 17, 2003)
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