High Temperature Oxidation Behavior of Yttrium Dioxide Coated Fe-20Cr Alloy
| Autor: | Lalgudi Venkataraman Ramanathan, Olandir Vercino Correa, Marina Fuser Pillis |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Materials science
Diffusion Alloy Oxide chemistry.chemical_element Oxidation behavior 02 engineering and technology engineering.material 010402 general chemistry 01 natural sciences Isothermal process Metal Coating chemistry.chemical_compound Yttrium dioxide General Materials Science Materials of engineering and construction. Mechanics of materials Iron-chromium alloy Mechanical Engineering Metallurgy technology industry and agriculture Yttrium 021001 nanoscience & nanotechnology Condensed Matter Physics High temperature 0104 chemical sciences chemistry Chemical engineering Mechanics of Materials visual_art engineering visual_art.visual_art_medium TA401-492 Grain boundary 0210 nano-technology |
| Zdroj: | Materials Research, Vol 19, Iss 3, Pp 611-617 (2016) Materials Research, Volume: 19, Issue: 3, Pages: 611-617, Published: 12 APR 2016 Materials Research v.19 n.3 2016 Materials research (São Carlos. Online) Universidade Federal de São Carlos (UFSCAR) instacron:ABM ABC ABPOL |
| ISSN: | 1516-1439 |
| Popis: | Long term isothermal and cyclic oxidation behavior of yttrium dioxide (Y2O3) coated Fe-20Cr alloy was studied. Oxidation tests were carried out in air for periods of up to 200 hours at 1000°C and the oxidation behavior of the alloy was evaluated gravimetrically. The Y2O3 coating reduced markedly the mass gain of the alloy. Energy dispersive spectroscopic analysis of scale sections on oxidized Y2O3 coated specimens revealed a Cr rich layer close to the metal/oxide interface and the presence of Y and Cr near the oxide/air interface, indicating diffusion of Cr through the Y2O3 layer. Further evidence of this diffusion was seen as change in colour of the Y2O3 coating from white to green after prolonged oxidation. X-ray diffraction analysis of the scale revealed perovskite-type YCrO3.This study attributes the increased oxidation resistance of the Y2O3 coated Fe-20Cr alloy to increased oxygen ion diffusion through the Cr2O3 scale due to YCrO3 formation and grain boundary segregated Y ion blocking alloy cation diffusion. |
| Databáze: | OpenAIRE |
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