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초초임계압 발전용 소재의 표면처리층의 고온 안정성 평가
류경환,송태권,이재현,김길수,이선호,엄기원,Ryu, K.H.,Song, T.K.,Lee, J.H.,Kim, G.S.,Lee, S.H.,Urm, K.W. 한국재료학회 2006 한국재료학회지 Vol.16 No.5
In order to improve thermal efficiency of the fossil fuel power plants, we need to develop advanced materials with superior durability in the ultra-super critical state, which requires surface modifications for superior surface properties. In this study, we coated the Incoloy 901 and 12-17Cr steels for turbine buckets and valves with nitriding, boriding, and $Cr_3C_2-NiCr$ HVOF(high velocity oxygen flow) method. Then the samples were heat treated at $650^{\circ}C$ for 100 hours in vacuum. We analyzed the evolution behaviors of nitrides such as $Fe_3N,\;Fe_4N$, and CrN and borides such as FeB and $Fe_2B$ with XRD and SEM/EDS by comparing hardnesses and compositions of the coated layers before and after the heat treatments.