Oxidation behaviour of ZrB2–SiC (Al/Y) ceramics at 1700°C

ZrB2–SiC(Al/Y) ceramic composites were prepared by hot-pressing a mixture of ZrB2 and polymer-derived SiC doped with either aluminium or yttrium (SiC(Al/Y)). The obtained composites were oxidized at 1700°C in air. The weight change as a function of the oxidation time was measured to study the oxidat...

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Bibliographic Details
Published in:Journal of the European Ceramic Society 2016-11, Vol.36 (15), p.3769-3774
Main Authors: He, Jiabei, Wang, Yiguang, Luo, Lei, An, Linan
Format: Article
Language:English
Subjects:
Doped
Oxidation
Oxidation kinetics
Oxidation resistance
ZrB2–SiC
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Summary:ZrB2–SiC(Al/Y) ceramic composites were prepared by hot-pressing a mixture of ZrB2 and polymer-derived SiC doped with either aluminium or yttrium (SiC(Al/Y)). The obtained composites were oxidized at 1700°C in air. The weight change as a function of the oxidation time was measured to study the oxidation kinetics. It was found that the ZrB2–SiC(Al/Y) composites exhibited significantly improved oxidation resistance, as compared to the composite of ZrB2 with un-doped SiC. The structure of the oxide resulted from the oxidation of the composites was characterized by scanning electron microscopy and X-ray diffraction. The results suggested that the improvement can be attributed to the formation of yttrium/aluminium-doped silica and/or yttrium disilicate, which effectively protect the composites.
ISSN:0955-2219
1873-619X
DOI:10.1016/j.jeurceramsoc.2016.02.037