Patent ID: 6316051
Filing Date: 2001-11-13
Classification: C04B,D01F

Abstract:
A process for producing silicon carbide fibers comprising the steps of:reacting activated carbon fibers having a fiber thickness of 1 to 30 .mu.m and a specific surface area of 700 to 1500 m.sup.2 /g determined by a BET nitrogen absorption method, with a gas comprising at least one member selected from the group consisting of silicon and silicon oxides, at a temperature of 1200 to 1500.degree. C. under a reduced pressure of in an inert gas atmosphere, to convert the activated carbon fibers to silicon carbide fibers;applying boron to the silicon carbide fibers, to cause the boron to be carried on the silicon carbide fibers; and thenheat-treating the silicon carbide fibers carrying thereon boron at a temperature of 1900 to 2300.degree. C. in an inert gas atmosphere, to enhance the mechanical strength and heat resistance of the silicon carbide fibers.