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  • 1
    Electronic Resource
    Electronic Resource
    The Effect of Supersaturation on the Internal Oxidation of Binary Alloys (1998)
    Springer
    Oxidation of metals 49 (1998), S. 237-260 
    Details
    ISSN: 1573-4889
    Keywords: BINARY ALLOYS ; INTERNAL OXIDATION ; SUPERSATURATION
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract According to the theory of Bohm and Kahlweit ofthe internal oxidation of binary A-B alloys, theparabolic rate constant for the formation of reasonablystable internal BOν oxides as well as theconcentrations of O and B at the oxidation front arecontrolled only by the degree of supersaturationnecessary for the nucleation of new oxide particles. Theeffects of this factor on the previous parameters arecalculated for various values of the solubility product ofthe oxide and of the diffusion coefficients of O and B.Moreover, an alternative procedure for the calculationof the critical degree of supersaturation behind the precipitation front required for oxideprecipitation, which is a function of the concentrationof the reactants at the internal oxidation front, isproposed. A simple modification of Wagner's theory of internal oxidation is also presented, andits results are compared with those of the treatment byBohm and Kahlweit. Finally, the limitations of the twomethods are examined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018834525388
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The Criteria for the Transitions Between the Various Oxidation Modes of Binary Solid-Solution Alloys Forming Immiscible Oxides at High Oxidant Pressures (1998)
    Springer
    Oxidation of metals 50 (1998), S. 1-26 
    Details
    ISSN: 1573-4889
    Keywords: OXIDATION MODES ; BINARY ALLOYS ; HIGH TEMPERATURES
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The possible high-temperature corrosion modes ofbinary solid-solution alloys forming two immisciblecompounds by a single oxidant include (1) the exclusivegrowth of external scales of the most-noble component, which may or may not be associated with theinternal oxidation of the most-reactive component, (2)the formation of composite external scales containing amixture of the two compounds, or finally (3) the exclusive growth of the most-stable compound asan external scale. The conditions for the stability ofeach scale structure depend on a number of thermodynamicand kinetics parameters, whose effects are examined quantitatively in this paper. Theconditions for the stability of the various structuresand the criteria for the transitions among them are alsoexamined. The maximum number of possible scale structures is four, but it can reduce to threeand, in some cases, only to two. In particular, theinternal oxidation of the most-reactive component maynot occur if the stabilities of the two oxides are not sufficiently different from eachother.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018847116670
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The Formation of Two Layers in the Internal Oxidation of Binary Alloys by Two Oxidants in the Absence of External Scales (1999)
    Springer
    Oxidation of metals 51 (1999), S. 129-158 
    Details
    ISSN: 1573-4889
    Keywords: BINARY ALLOYS ; INTERNAL OXIDATION ; TWO OXIDANTS
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract An improved treatment of the simultaneousinternal oxidation of binary solid-solution alloys bytwo different oxidants (double internal oxidation)producing two subsequent layers divided by a sharpplanar interface in the absence of external scales ofthe most-noble component has been developed by removingsome of the approximations involved in previoustheories. The kinetics of internal oxidation arecalculated, based on the assumption that all the partialprocesses follow the parabolic rate law, as expected fordiffusion-controlled processes. The overall thickness ofinternal oxidation for dual oxidants is found to be equal to or smaller than the sum of thoseproduced by the two oxidants taken separately under thesame experimental conditions. The ratio between thethickness of the two regions depends critically on the ratio between the diffusion coefficientsof the two oxidants, so that under appropriate limitingconditions, one of the two layers becomes negligible.The degree of enrichment of the most-reactive component in the region of internal oxidationby two oxidants is found to be uniform over the wholezone, but lower than what would be produced by each ofthe oxidants taken singularly. The theoretical predictions are then compared to someexperimental results. It is finally shown that theexternal layer will not contain the compound most stableon an absolute scale, but that most stable with respect to the actual composition of the gas phase,while scaling structures different from that assumedhere are also possible.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018858303891
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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