Oxidation Behavior of Nb-Coated Zirconium Diboride

Author

Jan E. Förster
William Fahrenholtz, Missouri University of Science and TechnologyFollow
Gregory E. Hilmas, Missouri University of Science and TechnologyFollow
Ravisankar Naraparaju

Abstract

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.

Recommended Citation

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

Department(s)

Materials Science and Engineering

Keywords and Phrases

Niobium coatings; Oxidation behavior; Thermochemical reactions; ZrB 2

International Standard Serial Number (ISSN)

1873-619X; 0955-2219

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2023 Elsevier, All rights reserved.

Publication Date

01 Jan 2023