The oxidation behavior of some Ni-Cr-Al alloys at high temperatures |
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Authors: | Ingard A Kvernes Per Kofstad |
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Affiliation: | (1) Central Institute for Industrial Research, Oslo, Norway |
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Abstract: | Oxidation of ternary Ni-Cr-Al alloys containing different Cr/Al ratios has been studied in the temperature range 800° to 1300°C.
Most of the studies were performed in 1 atm oxygen or air, but the oxygen pressure dependence for one of the alloys was also
investigated. The experimental methods included thermogravimetric measurements of oxidation rates and studies on reacted specimens
by means of X-ray diffraction, metallographic techniques, electron microprobe analysis, and electron microscopy. In general,
the oxidation rates decrease faster with time than that for an ideal parabolic behavior. The major reaction products were
NiO, Cr2O3,α-Al2O3, and Ni(Cr,Al)2O4. The relative amounts of these were a function of composition, temperature, oxygen pressure, and reaction time. The Ni-9Cr-6Al
alloy has the best oxidation resistance due to the formation ofα-Al2O3 at all temperatures investigated. The oxidation mechanism of the alloy is discussed. |
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