Ni-20Cr-0.5Al合金の高温酸化に及ぼすCe添加の影響

概要

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The isothermal oxidation bahavior of Ni-20Cr-0.5Al alloys with cerium contents of 0.01, 0.07 and 0.43% has been studied in air at 1, 200°C for up to 200 hours using weight-change measurements, X-ray diffraction, scanning electron microscopy, and electron probe microanalysis.Oxides externally formed during all the period of oxidation are composed of the continuous layers of NiO, NiCr2O4 and Cr2O8. The cerium additions reduce the oxidation rate by promoting the formation of a protective NiCr2O4 spinel layer. With an increase in time and the amount of cerium, the internal oxidation of aluminum developes into the alloy substrate, resulting in the improvement of the adhesion of the oxide scale. The internal oxidation of cerium is also observed in the alloy containing 0.43% Ce when oxidized for 200 hours.
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