Rare earth application for heat-resisting alloys

作者: Tadaaki Amano

DOI: 10.1016/S1002-0721(10)60371-7

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摘要: Abstract High-temperature oxidation resistance of Al2O3- and Cr2O3-forming heat-resisting alloys with rare earths (yttrium-implanted FeCrAl, -added FeCrAlPt alloys, Y2O3- or CeO2-coated NiCrSi, yttrium- lutetium-added NiCr NiCrSi) was studied in oxygen at high temperatures, by mass gain measurements, change amount spalled oxide, observation surface appearance, X-ray diffraction (XRD), scanning electron microscopy (SEM), probe microanalysis (EPMA) transmission (TEM). After 1573 K for 18 ks oxygen, oxide scale on FeCrAl alloy from the entire surface, however, yttrium-implanted showed good adherence. 1473 FeCrAlY decreased increasing yttrium up to 0.1 wt.% follwed an increase content, FeCrAl0.005Pt0.05Y appropriate additions platinum lower than that FeCrAl0.1Y alloy. Yttrium-added TEM analysis revealed alumina/alloy interface coherency. The rough, those FeCrAlPtY were smooth. Cyclic NiCrSi 10 cycles (1 cycle: 300 s) 1523 oxygen. Mass increased 3 then because spallation during cooling. On other hand, cycles, these Granular Cr2O3 particles Y2O3-coated size smaller This result suggested rate decreased. Oxide scales markedly along grain boundaries lutetium, temperature.

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