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Oxidation of γ-TiAl Intermetallic Coated with Electrodeposited Nickel-La2O3 Composite Films

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Abstract

A coating of nickel withLa2O3 particles waselectrodeposited on the surface of γ-TiAl toimprove its high-temperature oxidation resistance. Theexperimental results showed that contrary to theoxidation of bare specimens, the electrodepositedNi-La2O3 composite-coated onesexhibited much better resistance to both isothermal andcyclic oxidation in air at 1000 and 900°C. For theoxidation of the Ni-La2O3 composite-coated γ-TiAl EPMA/EDX microanalyses revealed that after the composite film had beenthoroughly oxidized, a La2O3-richNiO layer close to the gas-scale interface and twoalumina-rich layers, with one beneath the NiO layer and the otheradjacent to the γ-TiAl matrix, were produced inthe scale. The results indicated that the preferentiallyformed La2O3-doped NiO layerretarded the growth of rutile and favored the formation of twoalumina-rich layers. The mechanism of the effect of theelectrodeposited Ni-La2O3composite on the oxidation behavior of γ-TiAl isdiscussed in detail.

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Authors
  1. X. Peng
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  2. Z. Tang
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  3. T. Li
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  4. W. Wu
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Peng, X., Tang, Z., Li, T. et al. Oxidation of γ-TiAl Intermetallic Coated with Electrodeposited Nickel-La2O3 Composite Films. Oxidation of Metals 51, 317–331 (1999). https://doi.org/10.1023/A:1018826824364

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  • DOI: https://doi.org/10.1023/A:1018826824364

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