Influence of the ZrB2 content on the anti-oxidation ability of ZrB2-SiC coatings in aerobic environments with broad temperature range |
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| Affiliation: | 1. School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou, 510006, China;2. Department of Materials Science and Engineering, University of Sheffield, Sheffield, S1 3JD, United Kingdom;1. College of Materials Science and Engineering, Xi''an University of Science and Technology, Xi''an, Shaanxi, 710054, PR China;2. College of Material Science and Engineering, China University of Mining and Technology, Xuzhou, Jiangsu, 221116, PR China;1. Key Laboratory of Materials Modification by Laser, Ion, and Electron Beams (Dalian University of Technology) Ministry of Education, Dalian, 116024, China;2. School of Materials Science and Engineering, Dalian University of Technology, Dalian, 116024, China;3. School of Mechanical and Power Engineering, Dalian Ocean University, Dalian, 116023, China |
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| Abstract: | 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. |
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| Keywords: | Coating Anti-oxidation Dispersion strengthening Pinning effect |
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