SiC-fibers oxide coatings based on organoyttrium aluminoxanesiloxanes

Shcherbakova, G.I.; Apukhtina, T.L.; Storozhenko, P.A.; Varfolomeev, M.S.; Krivtsova, N.S.; Sidorov, D.V.; Drachev, A.I.

Авторы: Shcherbakova G.I., Apukhtina T.L., Storozhenko P.A., Varfolomeev M.S., Krivtsova N.S., Sidorov D.V., Drachev A.I.
Сборник: The 17 th International Symposium on Silicon Chemistry jointly with the 7 th European Silicon Days. ISOS XVII BERLIN 2014
Тезисы
Год издания: 2014
Место издания: Berlin
Первая страница: 236
Последняя страница: 236
Аннотация: A promising method of SiC fibers surface protection is the development of glass-ceramic coatings, the compositions of which pertain to the system Y2O3–Al2O3–SiO2, as the main phases, crystallizing in this system, have good operating characteristics: high melting point, low values of the linear coefficient of thermal expansion close to the CTE of silicon carbide.Authors synthesized organoyttroxanealuminoxanesiloxanes of the general formula:[(R**О)sY(OH)tOr]k•[Al(OR)l(OR*)x(OH)zOy]m•[Si R***2O]g. These compounds are the basis for the preparation of film-forming solutions in toluene or ethanol, which were used for the production of protective high temperature antioxidant coatings of Y2O3∙Al2O3∙SiO2 on SiC fibers. The polymer coating on the core and full-hole silicon carbide fibers was achieved by dipping the fiber in the film-forming composition - organoyttroxanealuminoxanesiloxanes solutions in toluene with a concentration of 2.0 – 4.0 mass % and with the predetermined molar ratio of Y: Al: Si. From 1 to 5 layers were applied. Each layer was cured at room temperature in an air atmosphere and a humid environment, then cured coated fibers were heat treated at 1500 - 1600°C in air and were held for 30 - 60 min. The study of morphology and elemental composition of the surface coatings on SiC-fibers after the heat treatment by SEM with EDS showed the formation of the nonporous dense, uniform coating both on the full-hole, and the core SiC-fibers. It has been established that the Y2O3∙Al2O3∙SiO2 coating on SiC fibers about 2 μm thickness has a structure similar to that of yttrium aluminum garnet. This work was supported by the RFBR project no.13-03-12014 ofi_m.
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