Metallic Nb-Coatings Were Deposited on Top of ZrB2 by Means of Magnetron Sputtering to Improve its Oxidation Resistance. High Temperature Oxidation Tests Have Revealed that the Metallic Nb-Coatings Lead to the Formation of a Dense Solid and Protective Reaction Zone in Addition to a More Stable B2O3 Liquid Solution at the Surface. Compared to Baseline ZrB2, a Reduction in the Oxidation Kinetics, as Well as the Thickness of the Porous Zirconia Layer by 71%, Has Been Achieved with the Help of Nb-Coatings. a Liquid Phase Sintering by Molten Nb2O5 Mechanism Was Responsible for the Formation of the Dense Reaction Zone under the Boria Layer, Resulting in the Improved Oxidation Resistance. Furthermore, the Experiments Revealed the Need for an Annealing Process of Nb-Coated Specimens, in Vacuum, to Improve the Adhesion of the Coatings with ZrB2 and to Avoid Spallation during Oxidation.
J. E. Förster et al., "Oxidation Behavior of Nb-Coated Zirconium Diboride," Journal of the European Ceramic Society, Elsevier, Jan 2023.
The definitive version is available at https://doi.org/10.1016/j.jeurceramsoc.2023.04.029
Materials Science and Engineering
Keywords and Phrases
Niobium coatings; Oxidation behavior; Thermochemical reactions; ZrB 2
International Standard Serial Number (ISSN)
Article - Journal
© 2023 Elsevier, All rights reserved.
01 Jan 2023