In situ formation of nanometer-scale TiIO_2/SiC functional compositional film on carbon fiber

摘要

In the toluene solution of the precursor Polycarbosilane (PCS) containing low-molecular-mass additive Ti(OC_4H_9)4, TiO_2/SiC nanometer-scale functional compositional film with the surface TiO_2 layer on CF was formed in situ by means of polymer-derived precursors. The effects of Ti (OC_4H_9)_4 concentrations and the maturating time were studied on the densification and TiO_2 particle size of surface layer. The compositions of film were TiO_2 and SiC crystal by XRD. According to the results of ESCA analysis, Ti(OC_4H_9)_4 compound oozed gradientiy from the pre-ceramic PCS to the surface layer after maturating time of 100 h. In the conditions of 45wt percent Ti (OC_4H_9)_4 and 100 h maturation, the nanometer-scale TiO_2 particles on continuous surface layer were formed by SEM photographs. The nanometer-scale TiO_2/SiC functional compositional film can modify the resistance to oxidation of carbon fiber.