Digitale Medien
Springer
Oxidation of metals
36 (1991), S. 317-337
ISSN:
1573-4889
Schlagwort(e):
β-NiAl
;
Fe-Cr-Al alloys
;
alumina formers
;
reactive element effect
;
oxidation mechanism
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Maschinenbau
Notizen:
Abstract The oxidation mechanism of the intermetallic compound β-NiAl and Fe-23Cr-5Al-0.2Zr alloys modified by reactive-element additions was studied in the temperature range 1273–1473 K by means of the two-stage oxidation method using the oxygen isotope18O as a tracer. It was found that outward cation diffusion predominates in the scale on β-NiAl. The contribution of the inward oxygen transport increased with increased reaction temperature and oxidation time. At 1473 K, implanted yttrium suppressed inward oxygen diffusion for oxidation times less than 1 hr. In the case of Fe-Cr-Al-Zr alloys the counter-current transport of reactants was observed on the non-implanted materials. Implanted yttrium was found to alter the transport mechanism. This effect appeared to be directly related to that of yttrium on the scale morphology and microstructure. Yttrium promoted the formation of cracks which provided an additional surface for the reaction.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF00662968
| Bibliothek |
Standort |
Signatur |
Band/Heft/Jahr |
Verfügbarkeit |
