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Open AccessArticle

Effect of MoSi2-Si3N4/SiC Multi-Layer Coating on the Oxidation Resistance of Carbon/Carbon Composites above 1770 K

1
Carbon Fiber Engineering Research Center, Faculty of Materials Science, Shandong University, Jinan 250061, China
2
Department of Mechanical and Aerospace Engineering, Sapienza University of Rome, 00184 Rome, Italy
3
Institute of Metal Research, Chinese academy of sciences, 72 Wenhua Road, Shenyang 110016, China
4
Department of Mechanical Engineering, CET, University of Sargodha, Sargodha 40100, Pakistan
5
Institutfür Metallformung, Technische Universität Bergakademie Freiberg, D-09599 Freiberg, Germany
*
Author to whom correspondence should be addressed.
J. Compos. Sci. 2020, 4(3), 86; https://doi.org/10.3390/jcs4030086
Received: 25 May 2020 / Revised: 30 June 2020 / Accepted: 30 June 2020 / Published: 3 July 2020
(This article belongs to the Special Issue Multifunctional Composites)
To improve the oxidation resistance of carbon/carbon composites at high temperatures (>1770 K), they were coated with MoSi2-Si3N4/SiC. The slurry and pack cementation methods were adopted to deposit the inner SiC layer and outer MoSi2-Si3N4 layer. The phase composition, microstructure, and elemental distributions in the coating were analyzed using SEM, XRD, EDS, and Raman spectroscopy. Oxidation tests show that the deposited multi-layer coating can protect the carbon/carbon matrix from oxidation at high temperatures (>1770 K) for 150h and that the coating can withstand 40 thermal cycles between 1773 and 300 K. It is observed that Si3N4 assists in the formation of a dense SiO2 layer at a high temperature, which plays a vital role in increasing the thermal cyclic and oxidation resistance of the coating itself. The weight loss of coated carbon/carbon composite is attributed to the formation of micro-cracks and diffusion of SiO2, MoO3, and N2 out of the material at high temperatures. View Full-Text
Keywords: carbon/carbon composites; multi-phase coatings; oxidation resistance; thermal cycling carbon/carbon composites; multi-phase coatings; oxidation resistance; thermal cycling
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MDPI and ACS Style

Abbas, I.; Wang, Y.; Elahi, H.; Siddiqui, M.A.; Ullah, M.; Qayyum, F. Effect of MoSi2-Si3N4/SiC Multi-Layer Coating on the Oxidation Resistance of Carbon/Carbon Composites above 1770 K. J. Compos. Sci. 2020, 4, 86.

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