The reactive element effect in commercial ODS FeCrAI alloys

Pint, Bruce A.; Garratt‐Reed, Anthony J.; Hobbs, Linn W.

doi:10.1080/09603409.1995.11689496

Cited by 155 publications

(86 citation statements)

References 83 publications

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“…However, these compositional changes were at most 1 at% and did not appear to include any phase precipitation. In both cases, Y ions were found to segregate to the alumina scale grain boundaries and the metal-oxide interface, as has been observed in many other alumina scales [9,12,[17][18][19][20][21][22][23]. Cycling did not appear to affect segregation.…”

Section: Nicralymentioning

confidence: 64%

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Characterization of thermally cycled alumina scales

Pint

Wright

et al. 2000

Materials at High Temperatures

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Cross-sectional transmission electron microscopy was used to characterize the alumina scales formed on several Ni-base alumina-formers. The alumina scale microstructure of Ni20at%Cr-19Al-0.05Y after 100, 1h cycles at 1100°C was compared to an isothermally-grown scale. Despite being near the onset of mass loss in cyclic testing, very few defects were noted in either scale microstructure. The more adherent scales that form on Hf-doped NiAl and Ni49at%Al-2Cr were also characterized. With the addition of Cr, the formation of α-Cr precipitates at the metal-oxide interface coincided with increased long-term scale spallation. No similar precipitation mechanism was observed to be associated with scale spallation on NiCrAlY.

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Section: Nicralymentioning

confidence: 64%

“…Periodically, Y-rich oxides formed by internal oxidation were observed. In cross-section, the alumina scale had the typical columnar structure [11][12][13], Figure 2c.…”

Section: Nicralymentioning

confidence: 99%

Characterization of thermally cycled alumina scales

Pint

Wright

et al. 2000

Materials at High Temperatures

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“…Similar behavior has been observed for all RE additions. [7,10,17,[23][24][25][26][27][28][29][30] The segregation of Hf ions is the most likely explanation for the low scale growth rate; however, its benefit over other dopants (e.g. Y and Zr), which also segregate at similar levels, has not been explained.…”

Section: Resultsmentioning

confidence: 99%

Compositional Effects on Aluminide Oxidation Performance: Objectives for Improved Bond Coats

Pint¹,

Haynes²,

More³

et al. 2000

Superalloys 2000 (Ninth International Symposium)

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In order to achieve long thermal barrier coating lifetimes, underlying metallic bond coats need to form adherent, slowgrowing A l 2 O 3 layers. A set of guidelines for developing aluminide bond coat compositions is proposed in order to maximize oxidation performance, i.e. forming a slow-growing adherent alumina scale. These criteria are based on results from cast, model alloy compositions and coatings made in a laboratoryscale chemical vapor deposition facility. Aluminide coatings are thought to have more long-range potential because of their lower coefficient of thermal expansion compared to MCrAlYs. The role of Pt in improving alumina scale adhesion and countering the detrimental role of indigenous sulfur is discussed. However, the improvements associated with Pt are minimal compared to reactive element doping. One strategy which has great promise for improvement is to incorporate Hf into the coating. From an oxidation standpoint, this would preclude the need for Pt in the coating and also reduce the scale growth rate. While excellent oxidation performance was observed for cast Hf-doped NiAl, its benefits can be compromised and even eliminated by co-doping with elements such as Cr,Ti, Ta and Re. Creating a pure Hf-doped NiAl is one promising approach for improving the oxidation performance of bond coats.

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“…mullite foams) or metals (e.g. Fe-Cr-Al alloy fibre mats [4]) gets hot owing to the heat provided by the combustion and radiates this heat out of the burner towards the heat sink. Since radiation is a much more effective heat transfer mechanism than convection, the major heat exchange route in the case of diffusive-flame burners, the combustion tem-perature might be kept at low values (700-1000 • C), thereby lowering the NO x outlet concentrations.…”

Section: Introductionmentioning

confidence: 99%

The catalytic combustion of natural gas in a membrane reactor with separate feed of reactants

Neomagus

Saracco

Wessel

et al. 2000

Chemical Engineering Journal

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The catalytic combustion of natural gas in a membrane reactor with separate feed of reactants Neomagus, H.W.J.P.; Saracco, G.; Wessel, H.F.W.; Versteeg, G.F. Take-down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.Downloaded from the University of Groningen/UMCG research database (Pure): http://www.rug.nl/research/portal. For technical reasons the number of authors shown on this cover page is limited to 10 maximum. AbstractThis paper provides an experimental and modelling analysis of the performance of a membrane reactor with separate feed of reactants for the combustion of methane. In this reactor concept methane and air streams are fed at opposite sides of a Pt/␥-Al 2 O 3 -activated porous membrane which hosts their reaction. The effect of a number of operating parameters (temperature, methane feed concentration, pressure difference applied over the membrane, type and amount of catalyst deposited, time of operation) over the attainable conversion was assessed, while measuring any possible slip of unconverted methane to the air-feed side. The maximum specific heat power load which could be attained with the most active membrane in the absence of methane slip was approximately 15 kW m −2 with virtually no NO x emissions. Such potential might perhaps be exceeded if a properly designed membrane is tailored on purpose. For this sake a model, based on differential heat and mass balances throughout the membrane thickness, proved to be a promising design tool, since it allowed proper accordance with the experimental data with a single fitting parameter (pre-exponential kinetic constant).

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The reactive element effect in commercial ODS FeCrAI alloys

Cited by 155 publications

References 83 publications

Characterization of thermally cycled alumina scales

Characterization of thermally cycled alumina scales

Compositional Effects on Aluminide Oxidation Performance: Objectives for Improved Bond Coats

The catalytic combustion of natural gas in a membrane reactor with separate feed of reactants

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