NiO whiskers growth driven by the presence of Pt nanoparticles during Ni-base superalloy oxidation
Year: 2025
Type: article
Abstract: The formation and growth of NiO whiskers on a platinum-containing nickel-base superalloy was monitored continuously up to 113 hours, at 920°C, under 50 Pa of air, using High-Temperature Environmental Scanning Electron Microscopy. The images recorded revealed that two types of whiskers form and grow at two different stages of the oxidation process. The first type of whisker forms as soon as the isothermal plateau at 920°C is reached. The growth rate is greater than 500 nm/min. After a few hours of isothermal oxidation, these whiskers have grown and are integrated into the oxide layer covering the surface of the sample. The second type of NiO whiskers forms after 20 hours of isothermal stabilization. They grow at a rate of around 1 to 10 nm/min for several tens of hours. The formation and growth of these whiskers is directly linked to the presence of platinum nanoparticles on the surface of the alloy. The mechanisms of whiskers formation and growth are discussed.
Source: Materials Characterization
Institutions: Centre National de la Recherche Scientifique, Université de Montpellier, Commissariat à l'Énergie Atomique et aux Énergies Alternatives, CEA Marcoule, Institut de Chimie Séparative de Marcoule, Institut Jean Lamour, Université de Lorraine, École Nationale Supérieure de Mécanique et d'Aérotechnique, Institut Pprime, Laboratoire des Sciences de l'Ingénieur pour l'Environnement, La Rochelle Université
Language: English
Subfield: Aerospace Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $3,320
Funder: Agence Nationale de la Recherche
OpenAlex ID: W4415908190