Materials and corrosion, Vol. 62 N° 7. Materials and corrosion - Juillet 2011
| Titre : | Materials and corrosion, Vol. 62 N° 7. Materials and corrosion - Juillet 2011 |
| Type de document : | Bulletin |
| Paru le : | 11/09/2011 |
Dépouillements
Article : texte imprimé
M. Montgomery, Auteur ;
S. A. Jensen, Auteur ;
U. Borg, Auteur
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By the end of 2009, there will be eight biomass and five biomass co-firing plants in Denmark. Due to the steep increase of corrosion rate with respect to temperature in biomass plants, it is not viable to have similar steam data as fossil fuel p[...]
Article : texte imprimé
N. Folkeson, Auteur ;
T. Jonsson, Auteur ;
M. Halvarsson, Auteur
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This paper reports the oxidation behaviour of a low-alloyed steel (Fe-2.25Cr-1Mo) in the presence of small amounts of KCl(s) at 400 and 500°C. Cleaned and polished sample coupons were exposed in a horizontal tube furnace with exposure times rang[...]
Article : texte imprimé
P. Promdirek, Auteur ;
G. Lothongkhum, Auteur ;
S. Chandra-ambhorn, Auteur
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The objective of this study is to understand the high temperature corrosion behaviour of the ferritic stainless steel type AISI 441 (18CrTiNb), a candidate for SOFC interconnectors, under dry synthetic fermentation biogas (CH4 + CO2 mixtures), p[...]
Article : texte imprimé
T. Neddemeyer, Auteur ;
M. Mocker, Auteur ;
M. Faulstich, Auteur
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In order to increase reliability and lifetime of heat exchangers in waste-to-energy plants corrosion resistant thermally sprayed coatings are applied in a higher extent. From the selection of a plant specific spray material and process via labor[...]
Article : texte imprimé
T. Blomberg, Auteur
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Thermodynamic calculations of the gaseous potassium species in boiler flue gases are presented. Results show that if the K(g)/Cl(g) molar ratio is still higher than 1 after the K2SO4(s) aerosol formation at high gas temperatures, the excess pota[...]
Article : texte imprimé
S. Tuurna, Auteur ;
T. Varis, Auteur ;
K. Penttil, Auteur
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Using biofuels in power and CHP boilers can pose a challenge for materials performance. Formation of deposits containing e.g. potassium, sulphur, calcium, sodium, and chlorine can result in severe corrosion of conventional steels and alloys at r[...]
Article : texte imprimé
S. Fontana, Auteur ;
S. Chevalier, Auteur ;
G. Caboche, Auteur
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One of challenges in improving the performance and cost-effectiveness of SOFCs (solid oxide fuel cells) is the development of suitable interconnects materials. Chromia-forming alloys and especially ferritic stainless steels, like Crofer22APU, ar[...]
Article : texte imprimé
T. Amano, Auteur
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High-temperature oxidation behavior of Al2O3-forming heat-resisting alloys with noble metal (palladium, platinum, gold) and rare earth (yttrium) additions was studied in oxidizing atmospheres (oxygen, oxygen-water vapor) for 18 ks at 1473, 1573,[...]
Article : texte imprimé
M. P. Taylor, Auteur ;
H. E. Evans, Auteur ;
S. Gray, Auteur
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Conventional thermal barrier coating (TBC) systems consist of an insulating ceramic topcoat, a bond coat for oxidation protection and the underlying superalloy designed to combat the oxidising conditions in aero- and land-based gas turbines. Und[...]
Article : texte imprimé
Y. Song, Auteur ;
C. Zhou, Auteur ;
H. Murakami, Auteur
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It is well known that Pt addition significantly improves the resistance of aluminide coatings to high-temperature oxidation and hot corrosion, which has led to the widespread application of Pt modified aluminide coatings on the superalloy compon[...]
Article : texte imprimé
A. Firouzi, Auteur ;
K. Shirvani, Auteur
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A laboratory-scale slurry silicoaluminizing process has been developed to apply coating into cooling passageways of a first-stage gas turbine blade. Analytical techniques for characterizing the coatings comprised optical microscopy, SEM, EDS, an[...]
Article : texte imprimé
H.-E. Zschau, Auteur ;
P. J. Masset, Auteur ;
M. Schutze, Auteur
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A new concept of oxidation protection is proposed for Ni-base alloys with Al-amounts of 2–5 wt%. Following Wagner's theory of oxidation the formation of a dense protective alumina scale is possible if the Al-activity is sufficiently high. This c[...]
Article : texte imprimé
A. Donchev, Auteur ;
A. Kolitsch, Auteur ;
M. Schutze, Auteur
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Titanium is a widely used structural material because of its low specific weight, good mechanical properties and excellent corrosion resistance at ambient temperature. As a result of increased oxidation at elevated temperatures and environmental[...]
Article : texte imprimé
P. Song, Auteur ;
M. Subanovic, Auteur ;
J. Toscano, Auteur
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In the present work the effect of atmosphere composition on the growth rate and adherence of the alumina scales was studied using free-standing MCrAlY-coatings and TBC-specimens with MCrAlY-bondcoats. The exposures comprised isothermal and cycli[...]
Article : texte imprimé
K. Aleksandrov, Auteur ;
M. Schutze, Auteur ;
I. Teliban, Auteur
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In order to minimise corrosion at high temperatures metallic or intermetallic Al- and/or Cr-rich protective coatings are applied to metallic alloys. Protection against corrosion is achieved by the formation of a continuous Al2O3 and/or Cr2O3 lay[...]
Article : texte imprimé
S. Neve, Auteur ;
P. J. Masset, Auteur ;
H.-E. Zschau, Auteur
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Intermetallic TiAl alloys are foreseen to substitute Ni-based alloys in several high-temperature applications such as turbine blades for aeronautics. Because of their low density the mass of these components could be reduced by half. However, a [...]
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