Sol-gel synthesis of oxide protective coatings of carbon fibers to increase heat resistance in aggressive oxidizing environments

Abstract

Abstract Ceramic coatings of the Al2O3/SiO2 composition by the sol-gel method on carbon fibers were obtained in order to prevent oxidation and destruction of the fiber at temperatures above 450°C. Various combinations and ratios of aluminum and silicon oxides were used. The results of scanning electron microscopy and X-ray diffraction showed a change in the topographic properties of carbon fiber during the deposition of coatings thereon. Thermal analysis showed that oxidative stability improved significantly due to coverage, increased to 1100°C.