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ZrSi2-SiC/SiC Anti-Oxidant Coatings Prepared on Graphite Spheres by Two-Step Pack Cementation Process

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Abstract:

A ZrSi2-SiC/SiC double layer was fabricated on the surface of graphite spheres by two-step pack cementation with zirconium, silicon, and graphite powders as mainly raw materials. The microstructure, phase, oxidation behavior, and thermal shock resistance of the ZrSi2-SiC/SiC composite coatings were studied. The results show that the outer coating is composed of ZrSi2 and SiC and the inner coating is composed of SiC, of which the thickness is 450 μm. Isothermal oxidation test was conducted in air at 1773 K for 20 h and a weight increase of 1.69% were recorded. After 10 times of thermal shock tests between 1473 K and room temperature, the weight of the coated specimens decreased by only 1.14%. The excellent oxidation resistance is due to the production of SiO2 and ZrSiO4 in the process of the oxidation of SiC and ZrSi2, forming a glass phase that can effectively prevent further oxidation.

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Periodical:

Key Engineering Materials (Volume 727)

Pages:

953-958

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.727.953

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Online since:

January 2017

Authors:

Zu Jie Zheng, Ping Zhou, Hong Sheng Zhao, Zi Qiang Li, Xiao Xue Liu, Kai Hong Zhang, Bing Liu

Keywords:

Anti-Oxidation, Glass Film, Graphite Spheres, Pack Cementation, ZrSi2, ZrSiO4

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© 2017 Trans Tech Publications Ltd. All Rights Reserved

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