ISSN:
1573-4889
Schlagwort(e):
OXIDATION
;
γ-TiAl INTERMETALLIC
;
ELECTRODEPOSITEDNi-La2O3
;
COMPOSITE FILM
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Maschinenbau
Notizen:
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.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1023/A:1018826824364
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