Influence of the ZrB2 content on the anti-oxidation ability of ZrB2-SiC coatings in aerobic environments with broad temperature range

ZrB2-SiC coatings with different ZrB2 contents were prepared by liquid phase sintering. The oxidation processes of coatings were explained according to TG results of ZrB2-SiC coatings and powders tested from 298 K to 1773 K. Results show that, increasing ZrB2 content made the weight of the samples c...

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Bibliographic Details
Published in:Journal of the European Ceramic Society 2020-02, Vol.40 (2), p.203-211
Main Authors: Ren, Xuanru, Shi, Huilun, Wang, Wenhao, Chu, Hongao, Chen, Peng, Feng, Peizhong, Guo, Litong, Li, Ziyu
Format: Article
Language:English
Subjects:
Anti-oxidation
Coating
Dispersion strengthening
Pinning effect
ZrB2
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Summary:ZrB2-SiC coatings with different ZrB2 contents were prepared by liquid phase sintering. The oxidation processes of coatings were explained according to TG results of ZrB2-SiC coatings and powders tested from 298 K to 1773 K. Results show that, increasing ZrB2 content made the weight of the samples changed from weight-loss of 10.04% to weight-gain of 0.14%, while the fastest weight-loss regions were narrowed, whose inflection points reduced from 1310℃ to 1050℃. Increasing ZrB2 content made the relative oxygen permeability of the ZrB2-SiC/SiC coatings reduced from 40%–60% to -10%-5%. Increasing ZrB2 content enhanced high-temperature stability of coatings, making final weight of samples changed from weight-loss of 0.16% to weight-gain of 0.11% after oxidation at 1773 K for 200 h. The peeling and dispersion of Zr-oxides formed Zr-B-Si-O compound glass layer, presenting enhanced stability, dispersion strengthening and pinning effect of Zr-oxides, which were responsible for the excellent anti-oxidation protective effect of coatings in a broad temperature region.
ISSN:0955-2219
1873-619X
DOI:10.1016/j.jeurceramsoc.2019.10.006