Glass fibers oxycarbide

Kamiya K., Yoko T., Tanaka K., Takeuchi M. Thermal evolution of gels derived from CH3Si(OC2Hs)3 by the sol-gel method. J. Non-Cryst. Solids 1990b 121 182-187 Kamiya K., Katayama A., Matsuoka J., Nasu H. Preparation of silicon oxycarbide glass fibers by the sol-gel method (in Japanese). New Glass 1994 9 4-14 Kamiya K. Fibers from sol-gel. Ceram. Trans. 1995 55 371-382... 

The interface between HM carbon fiber and a Pyrex borosilicate glass matrix was Analyzed by Bleay and Scott [111,112] and found to be some 100 nm thick and believed to comprise Na enriched silicon oxycarbide, showing that some reaction had taken place during fabrication. Measurement of the interlaminar shear strength of the composite indicated that this layer was not a source of weakness. Substantial fiber pull-out had occurred, however, exposing clean fiber surfaces and smooth sockets. It was concluded that the interfacial shear process was confined to the outer layer of the fiber. Heat treatment of the composite in air caused preferential oxidation of the fiber, the rate being higher parallel to the fiber axis than perpendicular to it. 

Balaba WM, Weirauch DA, Perrotta AJ, Armstrong GH, Anyalebechi PN, Kauffman S, MacInnes AN, Winner AM, Barron AR, Effect of sUoxane spin-on-glass and reaction bonded silicon oxycarbide coatings with a self-propagating interfacial reaction treatment (aspire) in the synthesis of carbon/graphite fiber-reinforced A1 metal matrix composites, J Mater Res, 8(12), 3192-3201, 1993. 

Above-mentioned facts promoted the research work on the oxycarbide glasses prepared from organically modified alkoxysilanes by the sol-gel method. Also, thermal decomposition process of gels made from alkoxides of other metals than silicon has been applied to produce carbide fibers, films and powders. In this chapter, the research works on sol-gel-derived oxycarbide glasses and crystalline carbides are reviewed. 

The fibers of oxynitride (Si-O-N) and oxycarbide (Si-O-C) glasses in which some oxygens in the Si02 glass network are replaced by nitrogen or carbon atoms, and also those of crystalline nitride and carbides have been prepared by the sol-gel method, as listed in Table 10-3. 

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