Ceramic Coating Based on La, Sr and Co on Ferritic Stainless Steel for ITSOFC Interconnects

2012 ◽  
Vol 727-728 ◽  
pp. 522-527
Author(s):  
Matias de Angelis Korb ◽  
Raimundo Nonato Ferreira Linhares Junior ◽  
Eduardo Etzberger Feistauer ◽  
Ledjane Silva Barreto ◽  
Vânia Caldas de Sousa ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Oxidation Resistance ◽  
Ferritic Stainless Steel ◽  
Mechanical Stability ◽  
Spray Pyrolysis Technique ◽  
Alloy Coating ◽  
Isothermal Oxidation ◽  
Austenitic Steels ◽  
Mechanical Resistance ◽  
Fuel Cell Performance

Ferritic stainless steels have been used to produce interconnects for intermediate temperature solid oxide fuel cells (ITSOFC) due to their appropriate properties. Ferritic stainless steel presents mechanical stability, much higher thermal and electronic conductivities; significantly lower cost, and mechanical resistance than austenitic steels. Besides, it presents a thermal expansion coefficient compatible with the other materials of the cell components. However, in the range of this device operating temperature (600 °C 800 °C) it can occur the formation of poorly conducting oxide (Cr2O3) reducing the fuel cell performance. The aim of this work was to obtain oxide coatings starting with La, Sr and Co nitrates applied by spray-pyrolysis technique on a stainless steel AISI 430 substrate. The coatings obtained were characterized by X-ray diffraction and scanning electron microscopy/energy dispersive spectroscopy. The oxidation resistance of the ferritic stainless steel, coated with a perovskite (La0,6Sr0,4CoO3) film, was investigated by isothermal oxidation. The results showed that the coating obtained promoted the increase of the ferritic stainless steel oxidation resistance. However, after the oxidation test, it was observed a Cr enrichment and a very pronounced Sr enrichment, near to the alloy/coating interface, which can be associate to the decomposition of La0,6Sr0,4CoO3 film.

scholarly journals High-Temperature Oxidation Behavior of a Cu-Bearing 17Cr Ferritic Stainless Steel

Scanning ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Mengqi Zhang ◽  
Ying Han ◽  
Guoqing Zu ◽  
Jiapeng Sun ◽  
Weiwei Zhu ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Weight Gain ◽  
Oxidation Resistance ◽  
Ferritic Stainless Steel ◽  
Oxidation Kinetics ◽  
Oxidation Behavior ◽  
Isothermal Oxidation ◽  
Element Distribution ◽  
Temperature Oxidation ◽  
Good Oxidation Resistance

The isothermal oxidation behavior of 17Cr-0.85Si-0.5Nb-1.2Cu ferritic stainless steel in air was studied from 850°C to 1050°C by analyzing its weight gain after oxidation. The kinetic curves were plotted using the oxidation weight-gain data, and the structure, surface morphology, and element distribution of the oxide films were analyzed by XRD, SEM, and EDS. The results showed that the oxidation kinetics curves at 850°C and 950°C followed a parabolic law, and a continuous and dense oxide film composed of Cr2O3 and MnCr2O4, FeCr2O4, and Cu-Cr rich spinel was formed, which reveals that the steel displayed good oxidation resistance. When the temperature was increased to 1050°C, the oxidation kinetics curves gradually changed from parabolic to linear after 40 h exposure, which indicated that the oxidation resistance significantly worsened. A lower oxidation resistance was observed at 1050°C due to the formation of a large amount of Fe2O3 on the surface and the volatilization of the inner Cr2O3 layer.

AK STEEL 441

Alloy Digest ◽  
2006 ◽  
Vol 55 (6) ◽  
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
High Temperature ◽  
Tensile Properties ◽  
Oxidation Resistance ◽  
Ferritic Stainless Steel ◽  
High Temperature Oxidation ◽  
High Temperature Strength ◽  
Temperature Oxidation ◽  
Temperature Performance

Abstract AK Steel 441 has good high-temperature strength, an equiaxed microstructure, and good high-temperature oxidation resistance. The alloy is a niobium-bearing ferritic stainless steel. This datasheet provides information on composition, hardness, and tensile properties as well as deformation. It also includes information on high temperature performance and corrosion resistance as well as forming and joining. Filing Code: SS-965. Producer or source: AK Steel.

Molybdenum effect on oxidation resistance and electric conduction of ferritic stainless steel for SOFC interconnect

2012 ◽  
Vol 37 (13) ◽  
pp. 10328-10336 ◽  
Author(s):  
Dae Won Yun ◽  
Hyung Suk Seo ◽  
Jae Ho Jun ◽  
Jae Myung Lee ◽  
Kyoo Young Kim
Keyword(s):  
Stainless Steel ◽  
Oxidation Resistance ◽  
Ferritic Stainless Steel ◽  
Electric Conduction

scholarly journals Laser Metal Deposition of an AlCoCrFeNiTi0.5 High-Entropy Alloy Coating on a Ti6Al4V Substrate: Microstructure and Oxidation Behavior

Crystals ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 638 ◽  
Author(s):  
Wenyuan Cui ◽  
Wei Li ◽  
Wei-Ting Chen ◽  
Frank Liou
Keyword(s):  
High Temperature ◽  
Oxidation Resistance ◽  
Alloy Coating ◽  
Isothermal Oxidation ◽  
Metal Deposition ◽  
High Entropy Alloy ◽  
Laser Metal Deposition ◽  
High Entropy ◽  
Ti6al4v Substrate ◽  
Temperature Application

Ti6Al4V has been recognized as an attractive material, due to its combination of low density and favorable mechanical properties. However, its insufficient oxidation resistance has limited the high-temperature application. In this work, an AlCoCrFeNiTi0.5 high-entropy alloy (HEA) coating was fabricated on a Ti6Al4V substrate using laser metal deposition (LMD). The microstructure and isothermal oxidation behaviors were investigated. The microstructure of as-deposited HEA exhibited a Fe, Cr-rich A2 phase and an Al, Ni, Ti-enriched B2 phase. Its hardness was approximately 2.1 times higher than that of the substrate. The oxidation testing at 700 °C and 800 °C suggested that the HEA coating has better oxidation resistance than the Ti6Al4V substrate. The oxide scales of the Ti6Al4V substrate were mainly composed of TiO2, while continuous Al2O3 and Cr2O3 were formed in the HEA coatings and could be attributed to oxidation resistance improvement. This work provides an approach to mitigate the oxidation resistance of Ti6Al4V and explore the applicability of the HEA in a high-temperature environment.

Effect of alloy grain size on oxidation resistance of silica-coated stainless steel

1994 ◽  
Vol 52 ◽  
pp. 676-677
Author(s):  
C. S. McDowell ◽  
S. N. Basu
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Stainless Steel ◽  
Oxidation Resistance ◽  
Powder Processing ◽  
Hot Isostatic Pressing ◽  
Silica Coating ◽  
Austenitic Steels ◽  
Coarse Grained ◽  
Fine Grained

Oxidation resistance of stainless steels, which rely on the formation of a Cr2O3 (chromia) scale, can be further improved through minor alloying additions such as Al or Si, or by application of coatings to the exposed surfaces. Although, additions of Si to austenitic steels have demonstrated an improvement in oxidation resistance, high Si contents can be detrimental to the mechanical properties of these alloys. The application of a silica coating on the surface of the stainless steel provides improved oxidation resistance without detrimental effects on the mechanical properties. This study examines the effect of the grain size of the stainless steel on the effectiveness of a silica coating as an oxidation barrier.Fully austenitic stainless steel of composition Fe-18(wt%)Cr-20Ni-1.5Mn was produced in both coarsegrained and fine-grained form. The coarse-grained alloy, with a grain size of approximately 100 μm, was produced by casting and hot rolling. The fine-grained alloy, with a grain size of approximately 5 μm, was produced by rapid solidification powder processing, followed by consolidated by hot isostatic pressing and swaging.

Improved oxidation resistance of a nanocrystalline chromite-coated ferritic stainless steel

2008 ◽  
Vol 178 (1) ◽  
pp. 282-290 ◽  
Author(s):  
Zigui Lu ◽  
Jiahong Zhu ◽  
Ye Pan ◽  
Naijuan Wu ◽  
Alex Ignatiev
Keyword(s):  
Stainless Steel ◽  
Oxidation Resistance ◽  
Ferritic Stainless Steel

Oxidation resistance of Cr 2 N and (Cr,W) 2 N coatings deposited on ferritic stainless steel

2017 ◽  
Vol 325 ◽  
pp. 7-13 ◽  
Author(s):  
Sheng-Min Yang ◽  
Yung-Ting Huang ◽  
Yin-Yu Chang ◽  
Yeong-Tsuen Pan ◽  
Dong-Yih Lin
Keyword(s):  
Stainless Steel ◽  
Oxidation Resistance ◽  
Ferritic Stainless Steel

Electrodeposition of Fe-Ni alloy coating on ferritic stainless steel

2010 ◽  
Vol 20 ◽  
pp. s226-s230 ◽  
Author(s):  
Shu-jiang GENG ◽  
Yan-dong LI ◽  
Dong XIANG ◽  
Shi-gang ZHOU
Keyword(s):  
Stainless Steel ◽  
Ferritic Stainless Steel ◽  
Alloy Coating ◽  
Ni Alloy

ACERINOX ACX 490

Alloy Digest ◽  
2020 ◽  
Vol 69 (9) ◽  
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Corrosion Resistance ◽  
Physical Properties ◽  
Tensile Properties ◽  
Oxidation Resistance ◽  
Ferritic Stainless Steel ◽  
Heat Treating ◽  
Low Carbon

Abstract Acerinox ACX 490 is an extra low-carbon, 17% chromium, ferritic stainless steel, that combines good corrosion, heat, and oxidation resistance with good formability and good mechanical properties. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, and joining. Filing Code: SS-1327. Producer or source: Acerinox, S.A.

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