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Preparation and application of ZrB2-SiCw composite powder for corrosion resistance improvement in Al2O3–ZrO2–C slide plate materials

Authors :
Long Feng
Jinjin Ban
Junhua Hu
Xinhong Liu
Chaojie Zhou
Quanli Jia
Source :
Ceramics International. 46:9817-9825
Publication Year :
2020
Publisher :
Elsevier BV, 2020.

Abstract

ZrB2-SiCw (w-whisker) composite powders were synthesized by a microwave-assisted carbo/borothermal reduction method under argon atmosphere using zircon, boric acid, and activated carbon as starting materials. The optimized ZrB2-SiCw composite powder was obtained by adjusting heating temperature and amounts of boric acid and activated carbon. Further, the effect of the optimized ZrB2-SiCw composite powder addition on corrosion resistance of the Al2O3–ZrO2–C slide plate material against O2 and Ca-treated steel was investigated. The results showed that the relative content of ZrB2-SiCw increased with increasing temperature. The excess of boric acid favored the formation of the ZrB2-SiCw, and the optimum amount of boric acid was overdosed to 30–45 wt%. The corrosion resistance and thermo-mechanical properties of Al2O3–ZrO2–C slide plate material could be improved effectively with 6 wt% ZrB2-SiCw composite powder addition, which was attributed to the excellent oxidation and corrosion resistance of ZrB2-SiCw composite powder. In addition, ZrB2-SiCw could confer excellent thermal shock resistance and reduce the generation of cracks, ultimately preventing corrosive media from infiltrating into slide plates, further increasing corrosion resistance of the plates.

Details

ISSN :
02728842
Volume :
46
Database :
OpenAIRE
Journal :
Ceramics International
Accession number :
edsair.doi...........eedcc67b05ff90e34a9173a8db1de6df
Full Text :
https://doi.org/10.1016/j.ceramint.2019.12.255