Abstract
Hafnium dioxide (HfO2) coatings were successfully deposited on zirconium diboride (ZrB2) using reactive magnetron sputtering. After the oxidation at 1500°C or 1600°C, the mutual dissolution of HfO2 and thermally grown ZrO2 was observed which has resulted in the formation of a mixed oxide zone. As the enrichment of the mixed oxide zone by ZrO2 progresses, monoclinic/tetragonal phase transition temperature of ∼1790°C for nominally pure HfO2 moves towards ∼1500 °C. Finally, the inevitable phase transition from monoclinic to tetragonal structure results in the development of cracks, pores, and gaps within the mixed oxide zone. Thickness measurements of the porous ZrO2 scale and the mixed oxide zone of coated specimens revealed an improvent in the oxidation behavior at 1500°C and 1600°C compared to uncoated ZrB2, proving its protective character for short duration oxidation.
Recommended Citation
J. E. Förster et al., "Hafnium Oxide Coating to Improve the Oxidation Behavior of Zirconium Diboride," Journal of the European Ceramic Society, vol. 44, no. 15, article no. 116774, Elsevier, Dec 2024.
The definitive version is available at https://doi.org/10.1016/j.jeurceramsoc.2024.116774
Department(s)
Materials Science and Engineering
Keywords and Phrases
Diffusion of ZrO2; HfO2 Coatings; Oxidation Behavior; Transition Temperature; ZrB2
International Standard Serial Number (ISSN)
1873-619X; 0955-2219
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2024 Elsevier, All rights reserved.
Publication Date
01 Dec 2024
