Zirconia growth on zirconium carbide single crystals by oxidation

Zirconium carbide is an important high-temperature structural material. Results of oxidation studies reported in the literature show a complex picture. In this investigation, three ZrC single crystals have been oxidized at high temperature and in Ar/O 2 mixtures at O 2 composition, respectively, (10...

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Bibliographic Details
Published in:Surface & coatings technology 2005-07, Vol.197 (2), p.294-302
Main Authors: Bellucci, Alessandra, Gozzi, Daniele, Kimura, Takashi, Noda, Tetsuji, Otani, Shigeki
Format: Article
Language:English
Subjects:
Applied sciences
Corrosion
Corrosion environments
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Interfaces
Materials science
Metals. Metallurgy
Other topics in materials science
Oxidation
Physics
Refractory carbides
Zirconia
Zirconium carbide
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Summary:Zirconium carbide is an important high-temperature structural material. Results of oxidation studies reported in the literature show a complex picture. In this investigation, three ZrC single crystals have been oxidized at high temperature and in Ar/O 2 mixtures at O 2 composition, respectively, (105.5±0.3) ppm for ZrC-A, (119±2) ppm for ZrC-B and (130.7±0.5) ppm for ZrC-C. The analysis of the kinetic data acquired through an apparatus based on two oxygen sensors, appropriately connected to a Quadrupole Mass Spectrometer (QMS), has been matched with the characterization of the oxidized samples. This has been performed by Auger Electron Spectroscopy (AES), Electron Probe Micro-Analysis (EPMA), Scanning Electron Microscopy (SEM), X-ray Diffraction (XRD) and Raman techniques. Through an appropriate processing of the experimental data, it has been possible to identify the main steps of the high-temperature ZrC oxidation process: (i) ZrC substrate interacts with O 2 producing C that is retained into the sample. According to AES analysis, carbon has been detected in the amorphous state; (ii) during the cooling treatment, due to crack formation, a relatively small fraction of C is burnt as revealed by CO and CO 2 formation. The characterization of the oxidized samples by XRD and Raman techniques has identified the presence of both the ZrO 2-c and ZrO 2-m phases.
ISSN:0257-8972
1879-3347
DOI:10.1016/j.surfcoat.2004.05.035