Abstract
AbstractSome alloys such as many Cr-based systems show mass gain discontinuities during thermogravimetric measurements which strongly affect the oxidation kinetics. The behaviour cannot be described by the current models available in the literature. Thus, a novel $$k_\mathrm{para}$$
k
para
–$$k_\mathrm{lin}$$
k
lin
-P-model was developed to describe oxidation kinetics during the isothermal exposure of materials which show such behaviour. Beside the parabolic rate constant $$k_\mathrm{para}$$
k
para
and the linear mass loss constant $$k_\mathrm{lin}$$
k
lin
, the P-value and $$f_P$$
f
P
are introduced to take into account spontaneous rapid mass gains due to local oxide scale failure. The parameter P serves as a measure for the mass gain due to discontinuous events and $$f_P$$
f
P
is the frequency of such events. The both parameters can be related to oxide scale detachment and growth stresses. The application of the model is demonstrated for the oxidation of Cr–Si-based alloys in synthetic air at $$1200^{\circ }\hbox {C}$$
1200
∘
C
for 100 h. For these alloys, the origin of the mass gain discontinuities is discussed and the meaning of P and $$f_P$$
f
P
is explained in more detail. Using this newly developed model, an insight into growth and nitridation resistance of oxide scales as well as scale adhesion is gained.
Funder
Deutsche Forschungsgemeinschaft
DECHEMA-Forschungsinstitut
Publisher
Springer Science and Business Media LLC
Subject
Materials Chemistry,Metals and Alloys,Inorganic Chemistry
Cited by
5 articles.
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