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Oxidation resistance and wettability of graphite/SiC composite

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Published/Copyright: July 4, 2018

Abstract

A graphite/SiC composite was synthesized at different calcination temperatures using microsilica and carboxymethylated cellulose. The oxidation resistance and wettability (with water) of graphite/SiC were investigated. The results showed that carboxymethylated cellulose could react with microsilica to form a coating of SiC on the surface of graphite at elevated temperatures. Consequently, SiO2 phase was converted into SiC phase above 1 600 °C. The microstructure of the SiC coating on graphite became denser with the increase in temperature. Thermogravimetric curves revealed that the weight loss of graphite was approximately 97.3 wt.% whereas the value decreased to 29.78 wt.% when SiC was formed. Differential scanning calorimetry analysis showed that the SiC coating decreased the enthalpy of the carbon oxidation reaction from 12.02 kJ g−1 to 1.14 kJ g−1, confirming excellent oxidation resistance. Furthermore, the water contact angle of graphite was approximately 78.5° whereas that of the graphite/SiC composite was reduced to 43°. The study of the formation of graphite/SiC composite showed that SiO2 could be reduced using carboxymethylated cellulose to SiO (g), which was deposited on the graphite to form SiC coating.


*Correspondence address, Prof. Xiangcheng Li and Prof. Boquan Zhu, The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, No. 947, Heping Road, Wuhan 430081, P.R. China, Tel.: +86-27-68862616, Fax: +86-27-68862616, E-mail: ,

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Received: 2017-10-12
Accepted: 2018-01-25
Published Online: 2018-07-04
Published in Print: 2018-07-12

© 2018, Carl Hanser Verlag, München

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