Oxidation Characteristics of Cr2O3-La2O3 and NiAl-La2O3 Coated on Ferritic Stainless Steel by Thermal Spray Method

2015 ◽  
Vol 751 ◽  
pp. 51-54
Author(s):  
Raden Dadan Ramdan ◽  
Asep Ridwan Setiawan ◽  
Rochim Suratman
Keyword(s):  
Stainless Steel ◽  
Thermal Oxidation ◽  
Thermal Spray ◽  
Ferritic Stainless Steel ◽  
Substrate Material ◽  
Weight Losses ◽  
Spray Method ◽  
Before And After ◽  
Oxidation Characteristic ◽  
Atmosphere Environment

The present works concerns in evaluating thermal oxidation characteristic of composite coating on ferritic stainless steel at high temperature application. SUS430 ferritic stainless steel was used as the substrate material whereas Cr2O3-La2O3 and NiAl-La2O3 were used as the coating material. Thermal spray has been used as the deposition method, whereas thermal oxidation at temperature of 750°C for 24, 48 and 96 hours has been employed on the coated material in the atmosphere environment. From the weight meausurement before and after thermal oxidation, it was observed insignificant weight losses, whereas this condition is stable for all the applied oxidation period. However weight losses is more on the NiAl-La2O3 as compared with Cr2O3-La2O3 samples, which is due to the morphological characteristic of the former layer as observed by scanning electron microscope (SEM) characterization. From X-ray diffraction (XRD) characterization, it was observed the formation of stable layer Cr2O3 for Cr2O3-La2O3 coated samples, whereas formation of NiO observed for the case of NiAl-La2O3 sample.

Oxidation Characteristics of Various Nickel Composite Coated on Ferritic Stainless Steel

2013 ◽  
Vol 789 ◽  
pp. 455-459
Author(s):  
Asep Ridwan Setiawan ◽  
Raden Dadan Ramdan ◽  
Budi Prawara ◽  
Steven Steven ◽  
Rochim Suratman
Keyword(s):  
Stainless Steel ◽  
Ferritic Stainless Steel ◽  
Sol Gel ◽  
Substrate Material ◽  
Stainless Steel Surface ◽  
Service Temperature ◽  
X Ray Diffraction ◽  
Composite Layers ◽  
Oxidation Characteristics ◽  
Before And After

The present works concerns in developing alternative interconnect material for solid oxide fuel cell (SOFC) application. For this purpose, ferritic stainless steel is used as the substrate material while various nickel composite layers were coated on the substrate in order to improve its oxidation resistance at SOFC application temperature. Nickel layers were deposited on ferritic stainless steel by high velocity oxy-fuel (HVOF) method. In order to create nickel-oxide layer, the coated samples is then heated at temperature of 950°C for 1 hour, wherease sol-gel coating was performed on the coated samples in order to create nickel manganese oxide spinnel composite layers. All samples were then oxidized at temperature 800°C for 8 hours, in order to evaluate their oxidation characteristics at SOFC service temperature. Before and after oxidation, x-ray diffraction (XRD) and scanning electron microscope (SEM) were performed to all samples. It was observed that coated samples effectively inhibit the formation of chromium oxide that normally occurs on stainless steel surface at SOFC service temperature.

scholarly journals Microstructure And Mechanical Properties Of Crofer 22 APU Ferritic Stainless Steel

2015 ◽  
Vol 60 (2) ◽  
pp. 985-988 ◽  
Author(s):  
M. Stygar ◽  
E. Durda
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Oxide Scale ◽  
Ferritic Stainless Steel ◽  
Qualitative Evaluation ◽  
Scratch Test ◽  
Microstructure And Mechanical Properties ◽  
Film Adhesion ◽  
Before And After

Abstract The objective of this work was to expand the knowledge on mechanical properties of the oxidized Crofer 22 APU Ferritic Stainless Steel. To examine adhesion of oxide scale formed on steel the scratch test was performed. Scratch test as an appropriate method for qualitative evaluation of the film adhesion to substrate has been used in many studies. Scratch properties were investigated before and after oxidation at 800°C for 500 hours in laboratory air.

scholarly journals Effect of LCFeCr Alloy Additions on the Non-metallic Inclusion Characteristics in Ti-Containing Ferritic Stainless Steel

2021 ◽  
Author(s):  
Yong Wang ◽  
Min Kyo Oh ◽  
Tae Sung Kim ◽  
Andrey Karasev ◽  
Wangzhong Mu ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Ferritic Stainless Steel ◽  
Low Carbon ◽  
Number Density ◽  
Fecr Alloy ◽  
Different Types ◽  
Before And After ◽  
Alloy Addition ◽  
Inclusions In Steel ◽  
Ti Content

AbstractThe influence of commercial low carbon ferrochromium (LCFeCr) additions on the inclusion characteristics in Ti-containing ferritic stainless steel was studied by laboratory experiment in this work. The inclusions in steel before and after the FeCr alloy additions were investigated through systematic samplings and microscopy investigations of the liquid steel. Different types of inclusions in the FeCr alloy and steel were detected and the evolution of the inclusion characteristics (e.g., composition, size, morphology, and number density) were investigated. The results showed that the Ti content decreased after the FeCr alloy additions. Furthermore, MnCr2O4 spinel inclusions originating from the FeCr alloys transformed into Ti2O3–Cr2O3-based liquid inclusions and Ti2O3-rich solid inclusions. They were formed due to the reactions between MnCr2O4 and TiN inclusions or dissolved Ti in molten steel. The ratio of Ti/Al in the steel melt has a direct influence on the evolution of inclusions from thermodynamic calculations. The addition of FeCr alloys caused an increased number density of these Ti2O3-containing inclusions and TiN inclusions up to 8 minutes from the time of alloy addition. The increased Cr content from 16 to 24 mass pct due to the FeCr additions can increase the critical N content to form TiN inclusions at a specific Ti content. Overall, this study has contributed to the understanding the behavior of inclusions from LCFeCr alloy during the alloying process in Ti-containing steel.

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