微量の Ce および Si を添加した Ni-Cr 合金の 1373K における高温酸化

概要

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Oxidation behavior of Ni-(20,40,60,80)Cr, Ni-(20,40,60,80)Cr-(0.2 or 0.3)Ce, Ni-(20,40,60,80)Cr-1Si and Ni-(20,40,60,80)Cr-1Si-(0.2 or 0.3)Ce alloys was studied for 14.4ks at 1373K in O_2 by mass-change measurements, X-ray diffraction, scanning electron microscopy and electron dispersive X-ray microanalysis. Mass changes of Ni-(20,40,60,80)Cr alloys increased negatively with increasing Cr content of the alloys. Voids were observed at oxide/alloy interface. The voids increased with increasing Cr content of the alloys. The spalling of surface oxide is attributed to the void formation. Surface oxide of Ni-20Cr-1Si-0.3Ce alloy showed good adherence. Formation of surface oxide NiCr_2O_4,and α-cristobalite and Ce oxide which were observed at the oxide/alloy interface may lead to improvement of oxidation resistance of the alloy.
湘南工科大学の論文
1992-03-31