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- W2044719782 abstract "Oxygen adsorption (“low pressure oxidation”) has been compared to oxidation at atmospheric pressures between room temperature (RT) and 700°C for Ni3Al that has been macroalloyed with chromium and microalloyed with zirconium and boron. The oxidation products have been investigated by X-ray photoelectron spectroscopy (XPS) and Auger electron spectroscopy (AES). Low pressure oxidation was carried out in-situ in the analytical instruments at an oxygen pressure of 2.5 × 10−7 Torr (3.3 × 10−5 Pa). For temperatures below 300°C there is formation of both NiAl2O4 and Cr2O3, together with aluminum and zirconium oxides which appear to be in precursor oxide phases. Above 300°C, only Al2O3 and ZrO2 form, together with a sub-oxide designated (ZrO)1. There is a preference for the ZrO2 to be in particles distributed along grain boundaries. By contrast, atmospheric pressure oxidation yielded only NiO, Cr2O3 and some NiAl2O4. Angle-resolved photoemission has shown that this oxide is in a layered structure with a thin outer layer rich in Cr2O3 over a mixed NiO and NiAl2O4 layer. This nickel containing oxide layer also appears to be layered, with the layer structure changing with temperature. The roles of chromium and zirconium are discussed for the different oxidation conditions." @default.
- W2044719782 created "2016-06-24" @default.
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- W2044719782 date "1990-01-01" @default.
- W2044719782 modified "2023-09-26" @default.
- W2044719782 title "Temperature and pressure effects for oxygen adsorption and oxidation of Ni3Al alloyed with chromium and zirconium" @default.
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- W2044719782 doi "https://doi.org/10.1016/0039-6028(90)90438-e" @default.
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