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Heat Treatment Effect on the Phase Composition of the Silica Electrochemical Coating and the Carbon Fiber Strength
Authors:Sergei Galyshev  Evgeniya Postnova  Olga Shakhlevich  Dmitrii Agarkov  Ekaterina Agarkova  Alexey Nekrasov  Rais Mozhchil
Affiliation:1.Osipyan Institute of Solid State Physics RAS, 142432 Chernogolovka, Russia; (E.P.); (O.S.); (D.A.); (E.A.); (R.M.);2.Moscow Institute of Physics and Technology, Instituskiy per. 9, Dolgoprudniy, 141701 Moscow, Russia;3.Institute of Experimental Mineralogy, Russian Academy of Sciences, 142432 Chernogolovka, Moscow Region, Russia;
Abstract:
This work is devoted to the study of the chemical and phase composition of a carbon fiber coating obtained by the electrochemical sol-gel method. The experimental data obtained using several independent complementary methods, including X-ray phase analysis, thermogravimetric and differential thermal analysis, scanning electron microscopy and elemental analysis, and X-ray photoelectron spectroscopy, are in good agreement with each other. It was found that the resulting coating consists of amorphous silicon oxide and crystalline potassium carbonate. Heating above 870 °C leads to the crystallization of cristobalite from amorphous silicon dioxide. At a temperature of about 870 °C, the coating acquires a smooth surface, and heating above 1170 °C leads to its destruction. Thus, the optimum temperature for the heat treatment of the coating is about 870 °C. The loss of strength of carbon fiber at each stage of coating was estimated. A full coating cycle, including thermal cleaning from the sizing, coating, and heat treatment, results in a loss of fiber strength by only 11% compared to the initial state.
Keywords:carbon fiber coating   electrochemical sol-gel coating   silica coating   carbon fiber
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