GROWTH AND STRUCTURE OF OXIDE FILM ON Ni42Cr6Fe ALLOY UNDER HIGH TEMPERATURE MOIST HYDROGEN
AN Bai; MA Jusheng; TA NG Xiangyun(Tsinghua Unirersity; Beijing 100084)(Manuscript received 1994-03-29; in revised form 1994-08-26)
Cite this article:
AN Bai; MA Jusheng; TA NG Xiangyun(Tsinghua Unirersity; Beijing 100084)(Manuscript received 1994-03-29; in revised form 1994-08-26). GROWTH AND STRUCTURE OF OXIDE FILM ON Ni42Cr6Fe ALLOY UNDER HIGH TEMPERATURE MOIST HYDROGEN. Acta Metall Sin, 1995, 31(16): 173-178.
Abstract Structural studies of the growth of oxide film on the glass sealing alloy Ni42Cr6Fe under high temperature moist hydrogen atmosphere were observed by using SEM, TEM and X-ray diffraction techniques. At initial oxidizing stage. Cr2O3 and spinel (Fe, Mn) Cr2O4 were nucleated simultaneously. The former mainly grew intergranularly and the latter intragranularly. Then, the growth of oxide film was mainly of Cr2O3 due to the selective oxidation of Cr. As oxidation goes on to a certain extent. the surface Cr depletes and the growth of oxide film changes into spinel as majority. Finally. the coarse spinel (Fe, Mn)Cr2O4 will form at outer surface, the fine Cr2O3 grains in the bed and the coarse spinel around fine Cr2O3 will be matured in the middle part of oxide film. (Correspondent: AN Bai, lecturer, Department of Materials Sciences, Tsinghua University, Beijing 100084)
