Oxidation Protection Coatings for Carbon Materials by Interfacial Control

Satoshi KITAOKA; Naoki KAWASHIMA; Kazushi AOYAMA; Craig A. J. FISHER; Noburou OSA; Yorihiko TANAKA

doi:10.14852/jcersjsuppl.112.0.S149.0

Journal of the Ceramic Society of Japan, Supplement 112-1, PacRim5 Special Issue

Session ID : 2

DOI https://doi.org/10.14852/jcersjsuppl.112.0.S149.0

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Host: The Ceramic Society of Japan

Co-host: Iketani Science and Technology Foundation, International Ceramic Federation, Commemorative Organization for the Japan World Exposition '70, The American Ceramic Society, The Australasian Ceramic Society, The Chinese Ceramic Society, The Korean Ceramic Society, Joint Research Consortium of Synergy Ceramics/Fine Ceramics Research Association, Nanotechnology Researchers Network Center of Japan, The Special Coordination Funds for Promoting Science and Technology, Japan National Tourist Organization, Aichi Prefectural Government, CASIO SCIENCE PROMOTION FOUNDATION, DAIKO FOUNDATION, Nagoya Convention and Visitors Bureau, The Asahi Glass Foundation, The Kao Foundation For Arts And Sciences, The Murata Science Foundation, The Ogasawara Foundation for the Promotion of Science & Engineering, ASAHI GLASS CO., LTD. Research Center, CENTRAL GLASS CO., LTD., ELECTRIC GLASS INDUSTRY ASSOCIATION OF JAPAN (EGAJ), Hattori Company, Ltd., Hitachi Research Laboratory, Hitachi, Ltd., HOYA CORPORATION, INAX Corporation, ITOCHU CERATECH CORP., Japan Cement Association, KYOCERA Corporation, KYUSHU REFRACTORIES CO., LTD., MINO CERAMIC CO., LTD., Murata Manufacturing Co., Ltd., NGK INSULATORS LTD., NGK SPARK PLUG CO., LTD., NICHIAS Corporation, NIKKO COMPANY, Nippon Electric Glass Co., Ltd., Nippon Sheet Glass Co., Ltd., NORITAKE CO., LIMITED, Tokuyama Corporation, TOTO LTD.

Papers

Oxidation Protection Coatings for Carbon Materials by Interfacial Control

Satoshi KITAOKA, Naoki KAWASHIMA, Kazushi AOYAMA, Craig A. J. FISHER, Noburou OSA, Yorihiko TANAKA

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Keywords: Carbon, Coating, Glass, Thermodynamics, Interfacial control

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Abstract

Porous carbon substrates have been sealed completely with a molten silicate glass, where the wettability of the carbon to the molten glass was improved by infiltration and pyrolysis of perhydropolysilazane. The interfacial structure between the carbon and glass depended on the N₂ partial pressures during sealing. Coating of the glass at a higher N₂ partial pressure was not followed by formation of cristobalite due to oxidation of the products pyrolyzed on the carbon substrate. The molten glass easily infiltrated into the substrate. Under lower N₂ partial pressures such as in Ar, the glass covered only the carbon substrate and seldom penetrated into the substrate. In this case, cristobalite was produced at the interface, with many pores also forming at the interface. The pores are due to the large amount of SiO produced by oxidation of the pyrolyzed species, leading to suppression of molten glass infiltration into the carbon. The structural changes occurring as a result of variation in N₂ partial pressures are described in terms of thermodynamic calculations.

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