Fiber-reinforced composites having having continuously varied fibre density across the month of the base layer, and manufacturing method thereof

摘要

Disclosed is fiber-reinforced composites having a gradient function having an excellent mechanical strength characteristic, good oxidation-resistance and good fracture toughness even at high temperatures not lower than 1500 DEG C. The fiber-reinforced composite according to the present invention includes: a base formed of carbon-fiber reinforced composites having a good mechanical strength characteristic and good fracture toughness; and a surface portion covering the base and formed of ceramic-fiber reinforced composites having good oxidation-resistance, wherein the carbon content rate of the base decreases almost successively from a central portion of the base to an interface portion of the base and the surface portion. This results in the fiber-reinforced composite which has good oxidation-resistance, a good mechanical strength characteristic and good fracture toughness even at high temperatures not lower than 1500 DEG C and in which an abrupt change in respective thermal expansion coefficients of the base and the surface portion in the interface therebetween is reduced by its gradient composition.