Effect of oxygen partial pressure on the oxidation behaviour of an yttria dispersion strengthened NiCr-base alloy

被引：14

作者：

Essuman, E. ^{[1
,2
]}

Meier, G. H. ^{[3
]}

Zurek, J. ^{[1
]}

Haensel, M. ^{[1
]}

Singheiser, L. ^{[1
]}

Norby, T. ^{[2
]}

Quadakkers, W. J. ^{[1
]}

机构：

[1] Forschungszentrum Julich, IEF 2, D-52428 Julich, Germany

[2] Univ Oslo, Dept Chem, FERMiO, N-0349 Oslo, Norway

[3] Univ Pittsburgh, Pittsburgh, PA USA

来源：

JOURNAL OF MATERIALS SCIENCE | 2008年 / 43卷 / 16期

关键词：

D O I：

10.1007/s10853-008-2795-7

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

An yttria dispersion strengthened NiCr-base alloy was studied with respect to isothermal oxidation behaviour at 1000 degrees C and 1050 degrees C in high- and low-pO(2) gases, i.e. Ar-O-2 and Ai-(-H-2)-H2O. The scale growth kinetics, morphology and composition were studied by thermogravimetry in combination with SEM/EDX and SNMS. Due to Y doping the Surface scale is very protective and initially grows predominantly by inward oxygen diffusion. Local formation of mainly outwardly growing oxide nodules occurs after longer oxidation times and is related to metallic protrusions formed as a result of internal oxidation of the minor alloying addition aluminium. The differences in scale morphology in the various environments are related to the effect of the gas composition on scale grain size and on the relative amounts of inward scale growth. Possibly the pO(2) dependence of the Ti-solubility in the chromia scale and/or hydrogen doping of the oxide plays all additional role in the scale growth process.

引用

页码：5591 / 5598

页数：8

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