Abstract: Polyferrocarbosilane(PFCS) was synthesized from polydimethylsilane and ferrocene. Low specific resistance Si-Fe-C-O fibers were prepared with the following process: The PFCS was
melt-spun, the resulted green fibers were cured by heating in air, and the cured fibers were sintered under an inert atmosphere.
The preparation techniques of continuous Si-Fe-C-O fibers were investigated. The results show that the specific resistance of the Si-Fe-C-O fibers is reduced to 10^-2Ω·tcm, when the amount of ferrocene in feed is 2%. The tensile strength of the
fibers is about 2.0GPa, and the length of the fibers is more than 500 meters. The element iron contained in the fiber accelerates the growth
of β-SiC crystalline grain. XPS depth analysis shows a carbon-enriched layer of about 120nm on the surface of fiber, the atomic
concentration of element Fe increasing a little from edge to inner.

Key words: continuous Si-Fe-C-O fibers, synthesis, specific resistance, β-SiC, XPS depth analysis